Living in a BrightDrop Zevo 600 for a year

01The vehicle

2024/2025 Chevrolet BrightDrop Zevo 600 — model CJ32905 (FWD) / CM32905 (AWD). Dead platform, 60%+ off MSRP, and a cargo box roughly twice the envelope of a Sprinter 170 EXT with none of the systems a van conversion assumes.

Cargo box dimensions

Chassis

Derived geometry that matters: the rear axle sits 73.01" forward of the rear body face (290 − 33.99 − 183). On the interior datum where station 0 = bulkhead, the rear axle is at ~station 96 and the wheel housings occupy roughly stations 76–118. Everything heavy goes forward of station 96. The 72.57" rear overhang is also the only part of the underbody outside the battery footprint — it is where a floor drain penetration is legal.

Battery and range, unmodified

Charging: L2 AC at 11.5 kW (17 mi/hr) or 19.2 kW optional (26 mi/hr); 0–100% in 9.5 hr standard, 17 hr Max. L3 DC peaks at 120 kW on a 400 V architecture, low → 80% in 45 min (Std) / 70 min (Max). Battery warranty 8 yr / 100,000 mi. The 12 V service battery is a BCI LN1, 80 Ah, 800 CCA. An 11.5 kW onboard charger nearly maxes a 50 A RV pedestal, so campground charging is a genuine strategy — roughly 15 hours to full off a pedestal.

What is different about converting an EV step van

The pricing arbitrage

Production is dead. CAMI (Ingersoll, Ontario) paused May 2025; Mary Barra announced cessation October 2025 citing slow demand and a regulatory shift. Confirmed not relocating. That is why the numbers look like this:

Supply as last surveyed: ~147 used nationwide on TrueCar, ~43 on Commercial Truck Trader. This is a distressed-fleet play — you are buying a 100–173 kWh vehicle for the price of a used Transit.

Buying guide

Decode the VIN before you call. Verify the option codes on the door jamb, not the listing.

VIN position 8 = battery and drive

Verified today against GM window stickers for 2025 model-year listings via cws.gm.com/vs-cws/vehshop/v2/vehicle/windowsticker?vin=. This is the single fastest filter you have — one character tells you whether the listing is the truck you want.

Verified example

Note that $55,644 sits above the $28–53K used band. It is an asking price on a near-new low-mileage unit, not a transacted price, and Max Range commands the premium. Do not anchor on the first Z-code truck you find — the arbitrage lives in the higher-mileage fleet returns.

Option codes to demand

Inspection checklist — bring a tape measure and a magnet

• Door jamb sticker: C7E vs C5F. The listing will not tell you and the salesperson will guess wrong.
• ETC vs ETJ confirmed against VIN position 8 and the printed window sticker.
• CC4 translucent roof present or not — changes the fan and insulation plan.
• Wheel-housing fore/aft extent and height above floor. The manual gives width intrusion only (15.08"/side). Estimates are ~42" long and 13–15" tall. Measure. Cabinetry depends on it.
• Exact lateral position of the 28.21" bulkhead doorway. Every floor plan here assumes it is curbside-biased.
• All 8 tie-down locations — the only 1,000 lb crash-rated anchors in the vehicle. Note whether any land where cabinetry wants to go.
• Factory-blanked side-door provision? A forum owner reports the Zevo 400 has side door covers. If the 600 does too, cutting a curbside entry door gets dramatically cheaper. Look for a scribed or filled panel outline forward of the curbside wheel arch.
• Roof gutter studs — confirm M8-1.25 threaded studs are present and undamaged. They are your zero-hole rack mount.
• Battery state of health and DC fast-charge history. Fleet returns get hammered on DC. 8 yr / 100k warranty transfers, but you want to know.
• Who services it. Get the nearest BrightDrop-trained dealer in writing before purchase, not after.

1. 25MY Chevrolet BrightDrop 400/600 Body Builder Manual — gmupfitter.com (local copy in reference/brightdrop/)
2. GM window sticker service — cws.gm.com/vs-cws/vehshop/v2/vehicle/windowsticker?vin=
3. GM fleet inventory locator — locategmfleetworktrucks.com (duplicated/stale syndicated data)
4. BrightDrop Forum, Building out a camper — C5F vs C7E identical curb weight
5. BrightDrop Forum, Power offboarding — 400 W factory ceiling, no retrofit
6. Grounded G3 coverage — InsideEVs, GM Authority

02Insulation, mounting & cutting

A 484 sq ft envelope with no engine heat, a 1.6 mm composite skin you cannot rivet into, and a traction battery under the floor you cannot drill through. Generic van content is wrong on all three counts.

2.1 Insulation

A Sprinter 170 EXT is roughly 250 sq ft of envelope. You are insulating 1.9× a Sprinter, with no engine heat and no alternator. That single ratio is the most under-appreciated fact about step-van conversions and it propagates into every heat-load, battery-sizing and heater decision downstream.

Then, in order:

1. 1.5" foil-faced polyiso in the large flat wall bays, foil tape every seam. Polyiso is terrible in a curvy Sprinter rib; the Zevo's flat square walls negate its only weakness.
2. 2" polyiso in the ceiling. Never XPS — the roof cavity exceeds its 165 °F service limit.
3. Thinsulate SM600L stuffed into every corner, radius, rib return and door surround polyiso cannot reach.
4. Floor: 1" polyiso (R-6), loose-laid over the factory 8 mm composite mat. It floats — you cannot fasten it. See 2.2.
5. Replace the rear roll-up with insulated swing doors or a bonded insulated panel. The slatted curtain is uninsulated, and it also steals 6" of headroom.

Target assembly: R-9 to R-10 walls, R-12 ceiling, R-6 floor, effective whole-envelope ~R-8 after bridging losses. Material budget $1,100–1,500.

Instead:

• Air-seal obsessively. Air leakage carries 10–100× more moisture than diffusion. Tape every polyiso seam, seal every penetration, gasket every cabinet-to-wall junction.
• Foil-faced polyiso is its own ~Class II vapor retarder — the right permeance, and taping the foil gives you the air seal in the same operation.
• Ventilate mechanically. Two humans, a dog and a cat put roughly 1–1.5 gallons of water per day into ~500 cu ft of finished volume. Ventilation is a system, not a nice-to-have.
• Froli or 3D mesh under the mattress. The underside of a mattress on a solid platform is the number one mold location in every documented van build. Non-negotiable.
• Wool anywhere you can afford it. It buffers moisture and dries without failing. Foam does not.

2.2 Attaching everything without drilling the floor

Adhesives that actually work on composite plus steel

The floor build-up — a floating, laterally captured deck

Roughly 165 lb and costs about 7/8" of headroom — you have 82", you can afford it. The deck cannot slide because the walls and the two bonded end cleats box it in; it cannot lift because the cabinetry sits on it and the cabinetry is anchored to the mounting track. Battery access covers stay reachable via the modular panel layout. Mark them, label them, make them tool-free.

Wall and ceiling build-up

2.3 Cutting: windows, fans, roof access

The manual's documented restrictions are the HV battery zone, orange HV cables, HVAC plumbing, the SRS module and 6 impact sensors, 8 keyless antennas, theft/inclination sensors, and the roof-rail airbag. The roof-rail airbag is 50 mm × 1,087 mm tall × 1,800 mm wide — that is cab only. It does not extend into the cargo box. The cargo-box side walls therefore sit outside every documented restricted zone and are the safest place to cut.

Composite construction imposes its own rules:

1. Cut only in the flat bay between steel ribs. Never through a rib. The ribs are the structure; the skin is a skin.
2. Cut from the inside with a fine-tooth downcut blade or an oscillating tool, to avoid chipping the outer gelcoat.
3. Reframe before glazing. Bond an aluminum sub-frame around the aperture with 3M 08115 and let it fully cure. The 1.6 mm skin alone cannot carry a window's load or resist flex around a hole.
4. Seal 100% of every raw composite edge. Composite wicks water along cut fibers. Epoxy or urethane edge seal, no exceptions.
5. Verify locally with a magnet and a borescope that you are not over one of the 8 keyless antennas or a harness run before committing. GM's own warning: covering antennas will impair keyless entry performance.

Windows

Spec four windows. Double-pane vs single-pane over ~12 sq ft of glazing is worth about 40 W at ΔT 50 °F ≈ 1 kWh/day ≈ 7% of a 15 kWh bank. Worth it for a full-timer. The insulated covers do more than the glass upgrade for a tenth of the price.

Roof fans

MaxxFan Deluxe 7500K peaks at 900 CFM; Fan-Tastic 7350 at 920. At 900 CFM the ~500 cu ft finished volume turns over in 33 seconds. Capacity is not the constraint — airflow path is.

• Fan 1 at ~station 30 (galley) — exhaust.
• Fan 2 at ~station 140 (bed/lounge) — reversible, intake.
• That is a ~110" longitudinal sweep through the whole box.
• Plus a low-level louvered intake near the rear, below the axle line and not over the pack, so incoming air crosses the animals at floor level where they actually live.

Roof rack and solar without a single hole

The factory roof has M8-1.25 threaded studs protruding above the rain gutter. Thread 25 mm coupling nuts onto them, bolt aluminum Unistrut across. Zero holes, zero adhesive, fully reversible — verified by owners on the forum. Off-the-shelf alternative: Torklift makes a no-drill ladder rack for the 2022–2025 BrightDrop, 500 lb capacity, accepts the Weather Guard EZ-Glide kit.

Target 1,000–1,200 W. Mount flush with a ~1.5" air gap and a leading-edge fairing. Do not build a tall rack and do not build tilt. Owners consistently report tilt is not worth the cost, complexity or weight — a 2 m² panel makes 1.5–2 kWh/day, while a bad rack has cost documented vans about 2 mpg. On a BEV that aero penalty is paid in range every single mile. For roof access, carry a stored ARB Altitude-style wide-step ladder; a permanent bonded ladder is drag, weight, a bond you have to trust, and a theft aid.

1. Ranger Design Mounting Track 6550-BZL and E-Floor 6541-BZL
2. BrightDrop Forum, Roof rails / racks — M8-1.25 gutter studs, zero-hole Unistrut method
3. BrightDrop Forum, Roof insulation — XPS 165 °F service limit
4. BrightDrop Forum, BrightDrop 600 as a camper — roll-up removal, translucent roof, thermal curtains

03Floor plans

Datum: station 0 = bulkhead, station 168.9 = rear face. Finished interior ≈ 78.7" wide × 78.5" high, assuming the roll-up door is deleted. Rear axle at ~station 96; wheel housings ~stations 76–118, intruding 15.08" per side.

Comparison

04Weight & payload

The traction battery already ate the GVWR. A 20-module Max Range pack weighs 2,321 lb before you add a single screw. This is the binding constraint on the entire project, and the naive build does not fit any configuration.

4.1 The payload matrix

Front GAWR is 5,291 lb on both GVWR codes. Rear GAWR is 5,732 lb (C5F) or 6,172 lb (C7E). Note that C5F and C7E rows share identical curb weights — the entire difference is a ratings change.

4.2 Build weight, as specified

4.3 What you give up to make it fit

Optimized: ~2,450 lb build + ~880 lb occupants and gear = ~3,330 lb.

4.4 Distribution, not just total

Rear GAWR 6,172 lb (C7E), front 5,291 lb. The rear axle sits at ~station 96 with 72.57" of overhang behind it — a long lever arm on the axle that is already the more heavily loaded of the two.

Sequencing note: at 8.34 lb/gal, a full 40 gal fresh tank is 334 lb that moves as you drive. Site it forward and low, and remember the tank is empty at the scale and full on the mountain pass.

4.5 Range consequences

Two separate effects, and the intuition most people carry is wrong on one of them.

Against DC fast charging that adds low → 80% in 45 min (Standard) or 70 min (Max), ~96 mi of winter highway range means stopping roughly every 90 minutes of driving. On a Standard Range truck that is the practical reality of a January travel day, and no amount of build optimization changes it.

4.6 The central tradeoff

You cannot have both range and payload. Max Range is AWD-only and eats 700 lb of curb weight, and that 700 lb comes straight out of your build.

05Electrical & solar

48 V house system, 15.36 kWh bank, 1,350 W of roof solar — which is all the roof will take. There is no alternator on this vehicle, so solar and shore power are the only two inputs to the house. That single fact makes the energy budget the hardest number on this page.

The hardware, as specified

Every part below is the exact unit costed in the BOM at §5.9. Photographs are the manufacturers' own product shots — nothing here is a rendering or a stand-in.

5.1 · System voltage

48 V, and it is not close

Take a 15 kWh bank and a 3–5 kW inverter and the arithmetic decides it before any preference does.

At 12 V, 15 kWh is 1,250 Ah of cells — a wall of batteries, a wall of copper, and a wall of money in lugs, busbars and Class T holders. At 48 V the same energy is three 100 Ah modules and 2 AWG. EXPLORIST.life's own threshold lands in the same place: past roughly 400–600 Ah at 12 V equivalent, or the moment you add air conditioning, go 24 V or 48 V.

The air conditioner is the actual tiebreaker

The good DC air conditioners for vans are 48 V native, and the amp gap is not marginal.

An air conditioner running overnight at 12 V is a 25–40 A continuous load through your entire distribution system. At 48 V it is ~6 A. Wire, fuses, disconnects and the shunt all shrink with it, and heat-pump heating becomes viable — which matters a great deal on a platform with no engine heat.

Battery bank

3 × Epoch 48 V 100 Ah heated LiFePO4 = 15.36 kWh at ~$1,999–2,199 each. That is 320 Ah at 48 V. A fourth module takes you to 20.48 kWh for about $8,000 total and +60 lb — the payload is there, the money and the recharge capacity are the constraint.

5.2 · Solar array

Three panels fit. Four do not.

Usable flat cargo roof is 4410 mm × 1820 mm per the Body Builder Manual. Modern 440–450 W residential panels in the MAH54 54-cell format are roughly 1722 mm × 1134 mm. Mount them portrait, side by side along the roof length, and the width math is brutal and simple.

126 mm. Panel width tolerance will not save you, and you still need frame gaps for the clamps. Array: 3 × 440–450 W = 1,320–1,350 W.

Aiko's 8.6 kg — about 57 lb for all three — is worth paying for on a roof you cannot weld to.

Mounting: everything loads into the M8 gutter studs

The cargo roof is a composite, non-metallic panel, not sheet steel. No welding, no magnets, no self-tappers into the skin, and no VHB-only bonding — composite plus thermal cycling plus 3.4 m of panel is a delamination story. The factory attachment points are M8 studs in the rain-gutter rails running the full length of both sides, and they are the only sanctioned load path. Span aluminum crossbars side to side, clamp panels to the crossbars, seal every stud interface with butyl plus a mechanical fastener, and leave ≥25 mm of air gap under the panels — hot panels lose 0.3–0.4 %/°C.

MPPT and stringing

Three panels in series at ~38 V Voc each gives ~114 V nominal at 25 °C and ~142 V at −10 °C. Cold-morning Voc is the number that destroys controllers.

One series string of three is correct: higher voltage, thinner wire from roof to controller, and a single roof penetration. The tradeoff is shade sensitivity — one shaded panel drags the whole string, which Aiko's ABC cells partially offset. If you later add a side array, give it its own MPPT rather than paralleling into the roof string.

5.3 · Inverter and shore power

One MultiPlus-II, one 120 V leg

Victron MultiPlus-II 48/5000/70-50 120 V, part number PMP482505110, ~$1,458.60.

The smaller 48/3000/35-32 is a reasonable downgrade if you skip resistive cooking, but the 5000 gives headroom for A/C compressor inrush stacked on an induction hob. Do not build split-phase. Two units gets you 8,000 W and 240 V for double the cost, weight and complexity, and nothing in this van needs 240 V.

The 50 A pedestal problem

This is the most consequential planning decision in the shore-power domain, and it is the opposite of what most builders assume.

A "50 A" pedestal is 50 A at 240 V split-phase — two 120 V legs. NEC 551.73(A)(1) rates it at 12 kVA, and the 80 % continuous rule caps usable draw at 40 A per leg, 9.6 kW total. Now put the van on it: the Zevo's onboard charger wants 48 A at 240 V = 11.5 kW, which exceeds the pedestal's continuous rating outright. You cannot run the van's charger at full rate on a 50 A pedestal at all.

5.4 · Distribution, protection, monitoring

Wire and fuse schedule

Every figure in that table is smaller than its 12 V equivalent. That is the 48 V dividend, and it shows up in labor as much as in parts cost.

Monitoring

5.5 · Bill of materials

Core system, 2026 pricing

~$14.5K core, ~$17.8K fully loaded, self-installed. Add labor if not.

5.6 · Energy budget

What you use versus what the sun gives you

Harvest, using daily kWh ≈ kW_array × PSH × 0.75 to account for soiling, heat, wiring, MPPT and tilt losses:

Annualized: 1 kW of array yields ~1,800 kWh/yr in Phoenix and ~1,100 kWh/yr in Seattle, so 1.35 kW is ~2,430 kWh/yr sunbelt, ~1,485 kWh/yr PNW.

Four things actually close the gap, in order of how much they move the number:

5.7 · The traction pack

Can you tap the 173 kWh pack? No.

What the factory does offer for offboard power is small enough to be irrelevant to a house:

The community workaround, honestly

There is a real, working pattern, and it is worth understanding even though you should not build around it. It is not a direct tap — it is a loop that exploits the van's own DC-DC converter.

You plug the van's AC charge inlet into a Level 1 EVSE running off a ~1 kW inverter on your own house bank, drawing the 720 W minimum. That keeps the van awake and charging. While awake, the van's T-18 DC-DC converter pushes traction-pack energy down into the 12 V system whenever the AGM sags below 12.56 V. You tap that 12 V energy at the battery distribution fuse block, run it through a 12 V → 48 V charger, and it lands in your house bank. The traction pack is effectively feeding your house through the vehicle's own 12 V bus.

And nobody knows what the T-18 actually sustains. The 350 A fuse is not a spec, and the community has not measured the converter's real continuous output. This one unknown decides whether the whole trick is worth building. Measure it on your own van before you spend a dollar on it:

If sustained output is ~100 A at 13.8 V (~1.4 kW), the loop nets ~700 W and is worth building. If it is 40 A (~550 W), you lose energy on every transaction.

Full safe implementation, in order:

5.8 · Failure modes

What breaks, and the backup

1. 25MY Chevrolet BrightDrop 400/600 Body Builder Manual — gmupfitter.com (local copy in reference/brightdrop/): roof panel 4410 × 1820 mm, composite roof, M8 rain-gutter studs, fuse block maps (F3UB 350 A, F71UA / KR202 60 A / 720 W), 173.3 kWh pack, LN1 80 Ah AGM, 11.5 / 19.2 kW AC charging
2. BrightDrop Forum — power offboarding, T-18 charger, roof rails/racks, campervan buildout threads: T-18 engage 12.56 V / disengage 76.5–83.4 % SoC, Enhanced Battery Support 2 h / 12 % floor, 720 W L1 minimum, the 7.7 kW roof-plus-sidewall build
3. 7Gen — BrightDrop best practices: Accessory Mode 30-second timeout, production status
4. EXPLORIST.life — 12 V vs 24 V vs 48 V system voltage thresholds
5. FarOutRide — DC air conditioner comparison: 48 V vs 12 V current draw, battery sizing
6. Mike Sokol / RV Electricity — rvelectricity.substack.com: NEC 551.73(A)(1) 12 kVA pedestal rating, 80 % continuous rule, RV PowerGate 30/50 A lockouts, campground demand factors
7. Victron Energy — MultiPlus-II 120 V lineup, AC input current limit 11–100 A, SmartSolar 150/45 and 250/60, SmartShunt, Orion-Tr 48/12-20A, Smart BatteryProtect
8. Epoch Batteries, RecPro, Aiko and Longi product pages — battery, A/C and panel specs, 2026 pricing

06Water, shower & toilet

80 gallons fresh in two interior tanks, a 32 × 32 shower-only wet room, a Nature's Head in a separate dry cabinet, and 50 gallons of grey that gravity-drains through the rear overhang. Every tank is inside the box, because the Ultium pack owns the underfloor and there is only 7.51" of ground clearance.

6.1 · Fresh water

Budget 12–14 gal/day, not the blog number

Published guidance clusters at 3–10 gal/person/day with showering as the swing factor. Build it bottom-up instead.

The disciplined number is achievable for a week. Nobody sustains it for a year. Design to 12–14 gal/day and accept that in month 8 they stop counting and burn 18.

80 gal split into two 40 gal tanks, for four reasons: redundancy if one cracks or gets contaminated; winterization granularity, so you can drain and bypass one and run on the other; weight distribution, symmetric about centerline instead of 668 lb in one corner; and fit — the Class A Customs T-4000 is 39.5 × 18 × 13", clearing the 53.53" wheel-housing gap easily at ~$120–180 each. The real reason to buy Class A Customs over a generic tank is that they will cut and weld bosses to your spec. If you would rather run one long tank in a wheel-housing channel, the T-5000 is 50 gal at 48 × 12 × 14".

Placement

Fresh tanks go as far forward as practical, on the floor, low and centered, ahead of the rear axle. That loads the front axle, which is what a rear-heavy step-van build needs. Do not put fresh in the 72.57" rear overhang — 668 lb cantilevered four to six feet behind the axle unloads the front axle and degrades steering and braking. The overhang is for the drain penetration, light storage and the litter box, not mass.

Tanks sit on 3/4" ply pads with closed-cell foam between tank and pad, strapped with 2" ratchet or steel banding to floor-mounted L-track. Do not through-bolt the floor — use the eight factory 1,000 lb cargo tie-down points plus bonded and riveted L-track. A full 40 gal tank generates a real dynamic load under highway braking, so use internally baffled tanks or keep tank length ≤40".

Fill, vent and distribution

Pump

The Aquajet's variable-speed motor ramps to match demand instead of hammering on and off. That is the difference between "an RV shower" and "a shower," and it is the single most noticeable quality-of-life item in the water system. Energy is irrelevant — 10 A × 12 V = 120 W running, so a 3-minute shower is 6 Wh. Mount it on rubber isolation feet to a mass, not a thin panel, with 18" flexible pigtails on inlet and outlet. Hard-plumbing a pump to PEX transmits every pulse into the structure and you will hear it at 2 AM. If you go Shurflo instead, add a Shurflo 182-200 accumulator, ~$68.

Filtration — two independent chains

Chain A, inline at the fill hose. This is the most important and least discussed part: everything you fail to filter here lives in your tank for the next week. Exterior 2-stage housing on the fill line — 5 micron spun-poly sediment, then 0.5 micron carbon block for chlorine, taste and VOCs. Clearsource Premier/Ultra, or DIY with a pair of 10" × 2.5" Big Blue housings and garden-hose adapters (~$120 DIY versus $500+ branded).

Chain B, under-sink at the drinking tap only. A 0.2 micron absolute hollow-fiber or ceramic cartridge — the bacteria and cyst barrier, and it is passive with no power draw.

Skip whole-system RO. Standard RO wastes 2–4 gallons per gallon produced, which on a 12 gal/day budget is catastrophic. But desert Southwest water — Quartzsite, Slab City, parts of NM and AZ — is genuinely awful, high TDS and tasting like a pool. The compromise is a countertop zero-plumbing unit, Bluevua RO100ROPOT or AquaTru, ~$350–450, run only when parked with water available, with reject water captured in a jug and used for rinsing.

Sanitization: 1/4 cup household bleach per 15 gal of tank capacity, circulate through every tap, sit 4 hours, drain, double-rinse. Every 6 months, plus any time the van sits more than 3 weeks with water aboard.

Winterization on a vehicle with no engine heat

This is the hardest problem in the build. On a diesel van the engine block is a 200 lb thermal battery you recharge every time you drive. You have none of that. If the house battery dies at 15 °F, the plumbing freezes and there is no fallback.

07Climate & pet safety

Heating this van is a solved problem that costs about two dollars a night. Cooling it is not solved, and on a vehicle with no alternator it may not be solvable off-grid. A 484 sq ft envelope, a 1,350 W array, and a cat that cannot be walked out of a hot box are the three facts that set everything below.

7.1 · The envelope

You are insulating twice a van

Every BTU number on this page traces back to one figure. The cargo box is 168.9" × 83.68" × 82", which is 14.07 × 6.97 × 6.83 ft, and the surfaces add up like this.

A 144" Sprinter envelope is roughly 300 sq ft. You have ~60 % more surface area to lose heat through, and against a 170 EXT you are still conditioning roughly twice the air volume — 614 cu ft. Every heater and A/C sizing figure written for a Sprinter build understates your job, and every insulation line item is ~60 % more material at the same spec: $900 / $1,600 / $2,500 low / mid / high for the full envelope.

Conduction loss is area × ΔT ÷ R. At 484 sq ft and a 70 °F interior:

Add infiltration at ACH × volume × 0.018 × ΔT: at 1 ACH and ΔT 50 on 614 cu ft that is only ~550 BTU/hr; at a leaky 2 ACH and ΔT 70 it is ~1,550 BTU/hr. Diesel air heaters are sealed-combustion — they draw combustion air from outside and vent outside — so the heater itself adds nothing to this term.

7.2 · Heating

Espar Airtronic S3 D2L, and it is the easy part of this section

2.2 kW = 7,506 BTU/hr. Against 5,600 BTU/hr of demand at 0 °F that is 75 % duty cycle — near-continuous, but it holds. At 20 °F it loafs at 53 %. Below −10 °F you are at 85 % and losing ground, which is the correct place for a full-time van to give up and drive south.

Do not oversize to 4 kW to chase −20 °F. An oversized diesel heater spends its life at minimum output, and low-output running is exactly the condition that carbons up the combustion chamber. Insulation quality, not heater size, is the deciding variable. In a sloppy R-5 build the same 2.2 kW unit is hopeless below ~25 °F, and no heater purchase fixes that.

Why a diesel tank on an electric van is not a compromise

Builders feel weird about this and say so on the forum: "something just doesn't feel right about having this excellent electric van and adding a diesel tank to it." The physics does not care. Heating the box through a 12-hour winter night takes roughly 48,000 BTU. That is either:

48,000 BTU ÷ 3,412 BTU/kWh = 14.1 kWh, which is 92 % of the entire 15.36 kWh bank for one night, and at a winter harvest of 3.6 kWh/day it takes almost four days of sun to put back. Diesel does the same job for 0.3 kWh — under 2 % of the bank, and 8 % of a single winter day's harvest. And you cannot pull the difference from the traction pack: 400 W of offboarding is 9.6 kWh/day at absolute best, before conversion losses, and §5.7 explains why you should not build around it at all.

Fuel tank: 5 gallons, and it cannot go under the floor

The Ultium pack owns the underfloor between the axles and the center aisle sits directly over it. That kills the obvious mounting location, exactly as it killed undermount water tanks in §06. Real options:

Size it at 5 gallons, 10 if the rear box allows. At 0.41 gal per 20 °F night that is 12 nights on 5 gallons and 24 on 10; measured as runtime it is 5 ÷ 0.04 gal/hr ≈ 125 hours. Bigger buys nothing but weight against a 2,200 lb build target. Useful fact that removes a whole category of worry: the fuel pump will lift far more vertical rise than you will ever ask of it, so tank placement is a packaging decision, not a hydraulics one.

Electrical, and wiring for the surge

A 12-hour night averaging ~2 A is 24 Ah at 12 V — ~0.3 kWh, under 2 % of the bank. But wire it for the surge, not the average: 15 A circuit minimum for the 2.2 kW unit. A 10 A fuse will nuisance-blow on the glow plug on every single start, at 3 AM, in February. The heater runs off the 12 V bus fed by the Orion-Tr 48/12-20A from §5.1, and it should be one of the last loads the BatteryProtect ever sheds.

Prefer a heater that modulates output over one that hard-cycles. Every thermostat restart is another glow-plug surge and another cold-start soot event, and over a winter the difference shows up in combustion-chamber life, not in the energy budget.

Layered heating architecture

7.3 · Cooling — the hardware

Cooling is not the mirror image of heating

Heat loss scales with ΔT. Cooling load does not, because solar gain dominates and this van has 98 sq ft of roof pointed at the sun. At a 75 °F interior, effective R-7, two adults, a dog, a cat and a compressor fridge:

Solar gain is 32 % of the daytime load and it is the cheapest term to attack: a white roof, a reflective awning on the sun side, and a windshield cover cut it materially for a few hundred dollars. In the Gulf Coast and Southeast, add 30–50 % to the latent portion — a marginally sized unit will hold temperature and leave the van clammy, which is how mildew starts in month eight.

12 V versus 48 V, in amps

§5.1 already settled the house at 48 V and the air conditioner was the tiebreaker. This is the table that decided it.

Same cooling work, one quarter of the current. A 12 V rooftop unit is a 25–60 A continuous load dragged through every busbar, fuse, shunt and disconnect in the van, for ten hours a night, for a year. At 48 V it is 6–15 A and the whole distribution system shrinks around it.

Under-bench, not rooftop, and here is the arithmetic

This is the decision most builds get wrong on this platform. The usable flat roof is 4,410 mm long and three 440 W panels consume 3,402 mm of it, leaving ~1,000 mm — which is already spoken for by the MaxxAir fan. A rooftop A/C takes that slot, and you drop to two panels.

450 W of lost array × 6.5 PSH × 0.75 derate = 2.2 kWh/day of harvest surrendered, every sunny day, forever, to buy duty-cycle headroom you only need on the worst afternoons. On a van whose defining problem is energy income, that trade is backwards. The Velit 2000U ducts under a bench and exhausts through the floor or a lower side panel, keeps the roof for panels, runs 50 dB in eco versus 64 dB in boost, and pulls roughly 4 gal/day of water out of the air — which matters more in Louisiana than the extra 5,000 BTU ever will.

7.4 · What cooling actually costs

The overnight number is fine. The 24/7 number is not.

Duty cycle first, against the loads in §7.3:

Now energy. Overnight only: 10 hr × ~2,000 BTU/hr = 20,000 BTU = 5.9 kWh thermal, ÷ COP 3 = ~2.0 kWh, call it 2.0–2.5 kWh with a warm start. 24/7 at 95 °F: ~3,500 BTU/hr average × 24 = 84,000 BTU = 24.6 kWh thermal ÷ 2.9 = ~8.5 kWh. 24/7 at 105 °F, where COP degrades to ~2.6: 12–14 kWh.

Then add the rest of the house. §5.6's summer column minus the A/C line is 4.5 kWh/day — fridge, lights, pumps, Starlink, laptops, induction, water heat, inverter idle. That addition is what turns the research's cheerful overnight verdict into something bleaker.

Days-on-bank uses 13.8 kWh usable out of 15.36 kWh, holding a 10 % floor. Note what the first row actually says: even overnight-only cooling is break-even, not comfortable. The research's cheerful "2.5 kWh against 6 kWh of harvest" verdict is true only if you ignore the fridge, Starlink and the induction hob, and you cannot ignore them. One overcast day and overnight-only cooling is also in deficit.

Five things move the number, in order of how much:

7.5 · The factory HVAC is not available to you

There is no camp mode

The obvious question — the van has 173 kWh and a working A/C, why not use it — has a documented, unambiguous answer.

That 24 kWh measurement was taken on a max-range van; on the Standard Range pack it is a much larger fraction of your day's driving. Architect the box to be thermally independent. Close and insulate the bulkhead door, run house-battery HVAC, and use the factory system only for the cab while driving. Every experienced builder on that forum thread reached the same conclusion.

7.6 · Pet safety

The cat is the binding constraint on the entire build

A dog can come with you into most of the places you are going. A cat cannot. That means the van itself must stay habitable while unattended, which upgrades cooling from a comfort system to a life-safety system with the same rigor as the CO detectors.

What actually happens when the power fails while you are in the grocery store

Walk the failure through. You are 200 ft away, inside a building, with the phone in your pocket. The house bank's BMS trips on an overtemp cell, or a breaker opens, or the A/C compressor faults. Now:

Every layer that shares the house bus fails simultaneously with the thing it was supposed to catch. That is the entire design principle: nothing in the pet-safety chain may draw its power from the system it is monitoring.

Monitoring hardware — two devices, two carriers

Buy the MarCELL for the phone call. A push notification is trivially missed in a grocery store with the phone on vibrate in a coat pocket; a ringing phone is not. Buy the Waggle because Verizon has no bars in exactly the canyon you will want to park in, and a monitor on a dead network is decoration. Both must have internal batteries. Subscriptions run $150–250/yr combined.

Five layers, no shared failure point

The charging stop, specifically

This is the scenario people assume is the hard one, and energetically it is not. A 45-minute DC fast-charge stop at 95 °F costs the house bank 4,800 BTU/hr ÷ 3,412 = 1,407 W thermal ÷ COP 2.9 = 485 W × 0.75 hr = 0.36 kWh, roughly 2.5 % of the bank. The house system is entirely independent of the vehicle's charging, so the A/C simply keeps running while the van charges.

The risk at a charging stop is not energy. It is that you are 200 ft away in a Buc-ee's for 45 minutes and a single component failure has a 20–40 minute fuse on it. The mitigation is the same five layers, plus one behavioral rule: on a hot-weather charging stop, one adult stays with the van. That is a real constraint on how two people travel together and it should be agreed on before the trip, not litigated in a parking lot in Amarillo.

7.7 · Budget and verdict

1. Build It Solar / PSU heat-loss references — BTU/hr = area × ΔT ÷ R, ACH infiltration formula; envelope areas derived from the 25MY Body Builder Manual cargo-box dimensions
2. BrightDrop Forum — power offboarding (7.2 kW module not retrofittable to 2023–2025), camp mode thread (Park timer, failed bypasses, 11 kW parked heat, 170→146 kWh over 8 hr), insulation and sound deadening (R-10 board claims, diesel-tank debate), end of BrightDrop (app never connected)
3. 2025 Chevrolet BrightDrop owner's manual p.123 — climate timer resets only on shifting out of Park
4. Webasto Air Top 2000 STC, Propex HS2000, Velit air heater, HEATSO clone comparison, Exod comparison
5. Dieselheat FAQ and Wireframe wiring guide — glow-plug surge, steady-state draw, circuit sizing
6. Nomadic Cooling X3, X3 48 V, Dometic RTX2000, Velit 2000U, Cruise N Comfort, EcoFlow Wave 3
7. The Vansmith solar sizing — harvest rules of thumb; array and PSH figures reconciled against §5.2 and §5.6 of this document
8. Waggle vs MarCELL, The Wayward Home roundup, PetPalHQ 2026

08Cost & bill of materials

A used orphan van at 60% off sticker, plus a conversion that costs more than the research's generic buckets because §05 and §06 replaced those buckets with real part numbers. Plan on $88,000 all-in and 750 hours. The lean version lands near $66K and gives up things you will notice every day.

8.1 · Donor vehicle

Buy at the bottom of a market that has no floor

Roughly 4,000 units remained at discontinuation and a forum member estimates ~2,800 of those sit on dealer lots, owned by the dealerships, not by GM. Dealers are carrying floorplan cost on orphaned inventory that has no fleet buyer. That is the entire reason this build is financially interesting.

The research budgets $32K / $40K / $50K, but it does so for a Max Range AWD. §04 of this document rejects Max Range — it costs 891 lb of payload against a build that is already 200 lb tight. You are shopping the cheaper truck, so shift the tiers down inside the same observed band.

8.2 · Electrical & solar

$14,425 core, and this is the line you do not touch

The full item-level BOM is in §5.5. Summarized here because it is 33% of the conversion and because the lean column is where people make the mistake.

The Cerbo is the only genuinely optional item, and it is a real loss — Victron Bluetooth on each device covers monitoring, but you lose VRM remote visibility and the programmable relay that §06 uses to run the water heater as a solar dump load. Cut it if you must; add it in month three when you are tired of walking to the panel.

8.3 · Climate — heat side

The A/C is already paid for. This is everything else.

The RecPro 48 V heat pump sits in the electrical BOM above, so it does not appear again here. Do not double-count it against the research's HVAC bucket, which bundles both sides.

8.4 · Shell — insulation, glazing, cutting

This runs above the research's $1,200–$3,500 glazing bucket because that bucket assumes two or three windows on a Sprinter. This van has 192 sq ft of side wall, all of it outside every documented restricted zone, and §02 specs four windows. More glass on a bigger box costs more. It is not an overrun.

8.5 · Plumbing, wet bath, interior

Deriving the plumbing line without double-counting

§06 quotes ~$12.25K all-in including cabin heat and contingency. Both of those live elsewhere in this table, so strip them out before using the number:

8.6 · Everything else

8.7 · Totals

8.8 · Labor versus DIY

750 hours is $56,000 you are not counting

General guidance puts a DIY conversion at 200–500 hours. That guidance is for a Sprinter and it understates this job badly.

Call it 700–800 hours — 9 to 14 months of nights and weekends, or 4 to 5 months full time. At a nominal $75/hr of engineering time, 750 hours is $56,000 of opportunity cost, which is most of the gap to a turnkey Grounded G3. Farming out the two flagged rows removes 160–260 hours, roughly a quarter of the build, and those are the two rows where a professional is measurably better than you are on your first attempt.

8.9 · Versus the alternatives

8.10 · What a lean build cuts, and what it must not

1. Cars.com, Carsforsale, TrueCar, Commercial Truck Trader — used Zevo 600 listings, $28,970–$53,615, 147 units nationwide
2. BrightDrop Forum — ~2,800 units on dealer lots at discontinuation; $55K all-in transaction on a $79,910 MSRP 2025 Zevo 400; C5F vs C7E identical curb weight
3. §05 of this document — electrical BOM, $14,425 core / $17,724 loaded, 2026 pricing
4. §06 of this document — $12,250 water and cabin-heat all-in, from which the $8,200 plumbing figure is derived
5. §02 of this document — insulation material budget $1,100–1,500; Arctic Tern, AM Auto and VanMade pricing
6. Webasto, Espar/Eberspächer, Propex and Velit product pages — heater output, fuel burn, electrical draw, pricing
7. GM Authority and InsideEVs — Grounded G3 pricing and 1,400 W V2H
8. VanLifeEscape, The Vansmith — baseline $15–25K conversion-only figures for comparison
9. Waggle, MarCELL and Temp Stick product pages — pet monitor pricing, connectivity and subscription terms

09Charging, logistics & platform risk

~150 miles of summer range and ~110 in winter, a 120 kW charge peak that is slow for the pack size, and a 22-foot step van that does not fit the stalls. The year runs on 100-mile legs and 50-amp pedestals. Then the part nobody wants to read: what happens when a body panel is unavailable and there is no manufacturer left to ask.

9.1 · The travel cadence

This van is bad at 600-mile days and good at the trip you actually want

Start from the range numbers in §04 and take the honest usable fraction. A 10→80% DC charging window is 70% of the pack:

At 60 mph, a 105-mile leg is 1 hour 45 minutes of driving followed by 45 minutes of charging. That is the rhythm. A stock Max Range owner reports "3 hours driving, 1 hour charging, still easy to do 600+ miles a day with 2 stops" — you do not get that. You have 60% of his pack. Your version is 150–200 mile days with two stops, which is four to five hours of moving and roughly ninety minutes of standing around.

9.2 · RV parks are the primary charging strategy

The pedestal math, and why this is not a fallback

A "50 A" pedestal is 240 V split-phase at 50 A, rated 12 kVA under NEC 551.73(A)(1), with the 80% continuous rule capping usable draw at 40 A per leg — 9.6 kW. §5.3 establishes the complication: the van's onboard charger wants 48 A at 240 V, or 11.5 kW, which exceeds the pedestal's continuous rating outright. You throttle the EVSE and split the pedestal.

The Standard Range pack is 102.4 kWh useful per the body builder manual. A 10→100% fill is ~92 kWh, so at 32 A that is 92 ÷ 7.68 = 12.0 hours. Check in at 6 p.m., leave at 8 a.m. with a full pack. That single arithmetic result is the reason the RV park is the primary charging strategy on this build and not a backup — a 22-foot van that struggles at DC stalls fits a pull-through site perfectly, and the interior West has far more 50 A pedestals than CCS stalls.

The kit

9.3 · DC fast charging reality

CCS1, ~120 kW, and a vehicle that does not fit the stall

The van is CCS1 with a 120 kW DC peak, port behind the driver's side rear wheel. It is not transitioning to NACS. On the Standard Range pack, 10→80% moves 102.4 × 0.7 = 71.7 kWh in about 45 minutes, which is a ~95 kW average against the 120 kW peak — respectable. The Max Range truck is the one with the bad ratio: 115 kWh at the same peak takes 80–95 minutes. Choosing Standard Range for payload also bought you the better charging curve. That is the one place in this document where the payload decision pays a bonus.

The physical problem is worse than the electrical one.

9.4 · Route planning

The gaps are longer than your range, and that is not hyperbole

9.5 · Season by season

50 A sites run $50–90/night. At ~40% hookup nights: 0.40 × 365 = 146 nights × $50–90 = $7,300–$13,140/year, call it $8–12K. That is a real line item and it partially erodes the fuel savings versus a diesel Sprinter. Budget it separately from the build.

Winter behavior

Three things change at once and they compound.

9.6 · Title, registration and insurance

Do this before you leave, or $53,000 of systems is uninsured

Texas requires 4 of 6 permanently installed independent life-support systems for an RV title conversion. This build satisfies all six: cooking facility, refrigeration, self-contained toilet, heating and air conditioning, potable water with faucet and sink, and separate 110–125 V supply.

9.7 · Orphan platform risk

What discontinuation actually means

GM confirmed the end of BrightDrop production at CAMI Assembly in Ingersoll, Ontario on October 21, 2025. Production had already been suspended since May 2025 — the plant sat stopped for six months. Production will not be moved to another site. GM states that fleet customers are expected to continue receiving parts and service and that "OEM services to existing fleets remains unchanged." Read that as a statement of current intent, not a contractual guarantee, and note that a forum member's research found no US federal law requiring a manufacturer to maintain parts availability for any period at all. That appears to be correct.

Risk register

Is an aftermarket forming?

The community is your aftermarket. It is a good one and it is roughly a hundred enthusiasts, not an industry. The counter-argument has real merit: orphaned RVs get sustained by owner groups for decades — the GMC Motorhome is still supported 45 years on — and a forum member argues the BrightDrop is unusually well suited to it, "the large square size like a small class A with the low moisture permeability of a van," unlike Class A motorhomes that rot from bad roof sealing. This may become a cult platform. That is a real possibility, not a plan.

9.8 · The pre-departure checklist

What to verify, stockpile and pre-plan before you leave DFW

9.9 · Bottom line

1. Camp and Charge — 50 A pedestal 240 V/50 A, 80% continuous rule, 9.6 kW usable; TT-30 is 120 V
2. Mike Sokol / RV Electricity — NEC 551.73(A)(1) 12 kVA rating, RV PowerGate 30/50 A lockouts, campground demand factors
3. InsideEVs and 7Gen — CCS1, 120 kW DC peak, port location, GM-approved adapter guidance
4. BrightDrop Forum — owner range data (2.13 mi/kWh over 2,600 mi, 298 mi best leg), step-van charging access, Ultium/Silverado parts commonality, HV tap discussion, discontinuation reactions
5. Nature Communications / Carnegie Mellon — state-level DC fast charging coverage metric
6. JD Power — Zion/Vegas/SLC 270-mile gaps, Western governors corridor initiative status
7. GM Canada and GM Authority — CAMI production end 10/21/2025, suspension since May 2025, no relocation
8. Texas DMV Assembled and Reconstructed Vehicle Manual — VTR-61, VTR-130U, 4-of-6 life-support requirement
9. Progressive DIY camper van and Roamly — RV title prerequisite, disclosure requirements
10. NHTSA recall database — front drive unit fire (66 units, 2022 MY), HV pack enclosure sealing, intermediate steering shaft (built 3/15/23–7/16/24), rear EDM CSP

10Inspiration & reference builds

The Zevo 600 box is 168.9" long, and once the walls, ceiling and floor are built up it finishes at about 78.7" wide by 78.5" tall. That is a rectangular room, not a van. Almost all vanlife content — Sprinter, Transit, Promaster — is solving a curved, cramped, 70"-tall problem you do not have. The useful reference class is box trucks, step vans, ambulances and skoolies. Everything below was checked for existence; nothing here is a guess.

The room, to scale

This is the part that decides whether the build works. The raw box is 83.68" wide and 82" tall. Two and a half inches of wall on each side, two inches of ceiling and an inch and a half of floor take that to 78.68" wide by 78.5" tall — which means the finished cross-section is, to within a third of an inch, a perfect square. Any picture that shows a room noticeably wider than it is tall is lying to you.

The wall number is the one to watch, because everything downstream hangs off it. The documented stack — ½" thermal break over the steel rib, 1.5" foil-faced polyiso, furring, ¼" panel — only lands at 2" if the furring is recessed coplanar with the insulation. Stack ¾" furring on top of the foam instead and you are at 2.5" before adhesive and tolerance. Polyiso also loses R-value as it gets colder, so the advertised R-9 to R-10 at 1.5" is a warm-lab figure, not a 0°F one. Plan at 2.5" until a physical wall mock-up says otherwise, and note what that costs:

And a 2–2.5" wall keeps the van comfortable at 0°F with the heat running. It does not make it passively freeze-safe. That distinction belongs in the plumbing plan, not the insulation one.

The closest analogs that actually exist

Two builds are on the same platform family. Everything else is a dimensional cousin.

Instagram accounts worth following

These handles were verified to exist. Individual reel permalinks were not verifiable programmatically, so these are accounts to browse rather than specific posts.

Communities

Builders, if the DIY math stops working

Named because they publish step van or box work specifically, not because of a quote.

Detail references, by problem

These are the seven specific things Plan C asks you to build that a stock van kit will not answer.

The 32" × 36" wet bath

The pocket door at station 110

The 48" galley run

The 20" bed plinth

The dog and the cat

Windows in a windowless box

The feel of the place

Two finish palettes, both proven on video

Neither of these is a box truck, and neither is electric. But both are the same order of interior volume, and both answer the question this build has not answered yet: what does it actually look like inside. Pick one and commit — the failure mode in a narrow room is mixing three wood tones and four metals until the eye has nowhere to rest.

REFSources & method

Every dimension, weight and rating on this page traces back to the GM body builder manual or to a named primary source. Where a figure is computed rather than published, the arithmetic is shown inline in the relevant section.

Research corpus

Roughly 143 distinct sources were consulted across four deep-dive research documents (electrical, layout, plumbing, and climate/cost/logistics). The load-bearing ones: