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Off-Grid Chef

Promaster 136Total: $2,697Full-time build
Off-Grid Chef

The build philosophy

The Off-Grid Chef is a Promaster 136 built around cooking. The owner is a professional line cook turned remote worker, and the entire build prioritizes kitchen capability over everything else — bigger fridge, more counter, proper ventilation, and enough electrical system to run induction continuously in any climate.

If you cook seriously and you're willing to sacrifice sleeping space, storage, or aesthetic minimalism for a real kitchen, this is the template. At $3,800 in gear, it's not cheap — but every dollar is in a component you use every day.

The kitchen zone

The galley runs 84 inches along the driver-side wall. From front to rear:

  • Full-height pantry cabinet (20" wide, 20" deep) with latching doors and internal dividers
  • National Luna Legacy 50 dual-zone fridge/freezer on a Front Runner slide
  • 30 inches of butcher-block countertop with a 3-inch lip at the front to prevent items from sliding
  • Two-burner Kenyon Silken flush-mount induction cooktop (custom dual-burner install)
  • 15 x 15 bar sink with gooseneck faucet at the rear end, over a 20-gallon grey tank
  • Upper cabinet above the sink and stove only, not across the counter middle (headroom for tall pots)

A dedicated 300 CFM rangehood vents through the roof above the cooktop, wired to a momentary switch. The counter is finished with mineral oil, not polyurethane — easier to refinish when it gets scorched.

The gear list

Total kitchen cost: $2,697

Electrical setup

Induction cooking for two people, full-time, means big electrical. This build runs:

  • 460 Ah Battle Born LiFePO4 bank (2x 230 Ah, self-heating)
  • 3000W Victron Multiplus pure sine inverter/charger
  • 800W rooftop solar (4x 200W panels)
  • 60A Victron Orion DC-DC charger from alternator

Daily kitchen draw runs 140–180 Ah in heavy cooking mode, 90–110 Ah on light days. The 460 Ah bank gives 2+ days of full autonomy, and the 800W solar replenishes it by early afternoon in good sun. In winter, the DC-DC charger does most of the work on driving days.

Total electrical system cost: ~$7,500 installed. Not included in the "kitchen" number above because it supports the rest of the van too (heat, Starlink, lights, fans).

Water system

A 30-gallon fresh tank sits under the passenger seat, insulated and heated by cabin air. A 25-gallon grey tank sits under the galley, with a dump valve accessed through the rear door. A Shurflo 4008 diaphragm pump with a 1-gallon accumulator delivers pressurized water to the sink at household-feeling pressure.

Pre-tank: 5-micron sediment filter on the fill hose. Post-pump: inline carbon block filter before the faucet. Separate LifeStraw Home Gravity Pitcher on the counter for drinking water from unknown sources — NSF-tested against lead, PFAS, microplastics, and bacteria, and it is the gravity pitcher we switched to after Berkey was pulled from Amazon and Walmart.

Restock cadence: fresh tank good for 5 days of two-person cooking, grey tank dumped at campground stations or RV parks.

What makes this build work

Three things separate this from typical Promaster conversions:

  1. Real prep counter. 30 inches of butcher block, uninterrupted, at 34 inches high. It's the single most important feature. Cabinets above the counter middle were intentionally omitted to keep headroom for a Dutch oven and tall pots.

  2. Dual-zone refrigeration. The Whynter FM-45G gives the owner a freezer that actually freezes — for ice, for long-storage proteins, for frozen vegetables that don't require a grocery stop every three days. It is the mainstream, Amazon-and-Walmart-available replacement for the specialty overlanding fridges that are hard to actually buy.

  3. Real ventilation. A proper rangehood that vents to outside air. Induction cooking generates steam and food odors that need to leave the van. A $180 rangehood makes the difference between a kitchen that feels like a kitchen and one that feels like a converted cargo bay.

Who should copy this build

This is the right build if you cook daily, you have a $30K+ total van budget, and the kitchen is the reason you're building the van. It is not the right build for weekenders, for couples on budget, or for people who eat out six nights a week.

A typical cooking day

A working line cook's daily rhythm does not stop because the kitchen now has wheels. The Off-Grid Chef build was designed around a schedule that looks roughly like this.

7:00 AM — Coffee and prep. Grind beans for pour-over, boil water on burner one of the Kenyon while the burner heats a small pan for eggs. Two burners running simultaneously is the single biggest reason this build is not a one-burner minimalist setup — coffee and breakfast happen in parallel, not in sequence. Total time from waking to breakfast on the counter: under ten minutes.

10:30 AM — Prep for dinner. Remote work fills the day, but prep happens in small pockets. Dice onions and carrots for a braise, sear off a chuck roast on the cast iron, brown some pancetta, then the Dutch oven goes into the oven (portable convection oven on a cabinet shelf, 275°F, three hours). The rangehood pulls the smell straight out through the roof rather than letting it live in the mattress for the next week — a non-obvious feature of the build that becomes obvious the first time you try to sleep in a van that still smells like garlic from dinner.

1:00 PM — Lunch, fast. A big salad, or leftovers from the night before, or a grain bowl from pre-cooked components in the fridge. Lunch in this build is rarely cooked from scratch — the prep work happens in morning and evening blocks, and lunch is assembly. The 30 inches of butcher block is the MVP here: enough space to spread out four components, chop something fresh, and plate without moving the laptop off the dinette table.

6:00 PM — Dinner. The reason the van exists. Two burners running, the oven finishing the braise, the sink full of prep dishes getting washed in small batches as the cooking progresses. Dinner is almost always three or four components — a protein, a starch, a green, a sauce — and it takes 45 minutes of active attention. Induction makes the timing work: power levels respond instantly, simmer stays at simmer, and no burner is wasted on "medium-low while I figure out what to do with the pasta water."

8:00 PM — Cleanup. Two zones: hot soapy water in the sink for pots, the drying rack for plates and cookware. The 20-gallon grey tank absorbs dinner's dishes without needing an empty. The butcher-block gets wiped with warm water and mineral oil touched up once a month. Counter is clear, Snow Peak titanium goes back in its bag, the rangehood gets a final ten-second run to clear residual steam, and the kitchen is reset for the next morning before bed.

The electrical math, spelled out

Two-burner induction cooking for two people is not a gentle draw. At full tilt, both Kenyon burners pull about 1800W each — 3600W total, which is the reason this build has a 3000W Multiplus inverter and a 460 Ah bank instead of a 2000W inverter and 200 Ah. But the average draw is much lower. A typical dinner session runs one burner at high and one at medium-low: maybe 2200W average, for 30 minutes of active cook time. That works out to roughly 90 Ah per dinner.

Add breakfast (one burner, 15 minutes, 15 Ah), lunch assembly (zero cooking Ah beyond the fridge), fridge running 24/7 (30 Ah), lights and Starlink and laptops (25 Ah), and you land at a daily kitchen-and-cabin draw of 160 Ah on a heavy cooking day. The 460 Ah bank at 80% DoD gives 368 Ah of usable capacity — two days of full autonomy even with zero solar input, three days with careful conservation.

With 800W of solar panels on the roof, summer harvest in the American Southwest and Rockies is 3.5–4 kWh per day, which is 290–330 Ah at 12V. That replaces the entire daily kitchen draw with margin left over for shore-free weeks. In winter, solar drops to 25–35% of summer and daylight shortens to nine hours. The DC-DC charger from the alternator — 60A for up to an hour of driving per day — fills the gap on travel days. On stationary winter days, the bank slowly drains and a shore plug-in every four to six days tops it back up.

The lesson: a two-burner induction setup is absolutely achievable off-grid, but only if you size the electrical system for the peak, not the average. A 200 Ah / 2000W / 400W-solar system will not do this build. 460 Ah / 3000W / 800W solar is the floor.

Why the butcher block counter matters

The 30 inches of uninterrupted butcher block is the feature every other feature exists to protect. Cooks know immediately why: you cannot prep four components for a dinner on a 12-inch square. You cannot rest a hot cast iron off the burner unless there is somewhere for it to go. You cannot have a cutting board, a stack of prepped vegetables, a mise en place of spices, and a drying towel all visible at once unless you have counter space. The minimalist Sprinter build works because it accepts a single-pan, single-component workflow. The Off-Grid Chef build works because it refuses to.

Butcher block was chosen over stainless, epoxy, or laminate for three reasons. First, it is warm to the touch and absorbs some vibration — dishes do not clatter against it the way they do on steel. Second, minor scorches and knife marks sand out with a palm sander and a coat of mineral oil, which is a five-minute fix at a campsite; a damaged epoxy counter is a pull-the-whole-thing-out replacement. Third, it looks less like a commercial kitchen and more like a home kitchen, which matters when the kitchen is also the living room.

The finish is pure mineral oil, reapplied every four to six weeks. Not polyurethane, not Waterlox, not beeswax blend. Mineral oil because it is food-safe, because it reapplies in three minutes with a rag, and because it will never delaminate or peel the way a film finish can on a surface that flexes with vehicle motion.

The ventilation question

Most van kitchen guides skip ventilation entirely or hand-wave it with "open a window." That works for a butane stove producing 8,000 BTU for ten minutes. It does not work for two induction burners running 40 minutes of active cooking, producing steam, oil aerosols, and food aromatics in an enclosed 200 cubic foot cabin.

The 300 CFM rangehood in this build vents through a 4-inch stainless duct straight up through the roof, with an aluminum backdraft damper to prevent rain and cold air intrusion when it is not running. It is wired to a momentary switch mounted under the upper cabinet above the sink. The total cost — hood, duct, damper, roof fitting, switch — was about $180 and half a day of install time.

The payoff is a van that does not smell like dinner in the morning. Anyone who has tried to sleep on a mattress six feet from where they pan-seared salmon four hours earlier knows why this matters. A proper rangehood is not luxury; in a full-time cooking build, it is basic hygiene.

What breaks at this ambition level

Every ambitious build has failure modes the minimalist builds avoid by virtue of not having that part in the first place. The Off-Grid Chef's vulnerabilities are:

  1. The Kenyon induction units are glass-topped. A dropped cast iron pan will crack one. Replacement is $550 and a week of shipping. Mitigation: the lip on the front of the butcher-block counter prevents pans from sliding off, and cast iron gets lowered onto the glass, not dropped.
  2. The grey tank. A plumbed 25-gallon grey tank needs a dump valve, a vent, and regular rinsing to avoid becoming a permanent source of smell. Mitigation: dump every three days whether it needs it or not, and flush with hot water plus a tablespoon of baking soda weekly.
  3. The electrical system is the budget. $7,500 in batteries, inverter, and solar is a real number. If induction or the battery bank fails on the road, the backup plan is the Gas One GS-3000 butane stove at the bottom of the gear list and a shore plug-in at the next campground.

For the cook who understands all three and builds them in from day one, the Off-Grid Chef does what no other build on this site does: it makes daily cooking in a van feel like cooking in a house.

See the van kitchen layouts guide for the principles behind the zone placement, and the van kitchen power budget guide for the electrical math.

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