What a truck roof can actually produce
A step-van or box-truck roof is roughly 7 feet wide by 14–20 feet long, but the exhaust hood fan, the fresh-air vent, the AC unit if there is one, and the roof-mounted propane tank cage all take space. Realistically 400–1,200 W of rigid panels fit, mounted flat. At Colorado latitude that produces about 2–5 kWh on a sunny summer day and a third of that in winter, less if the truck parks under a canopy at events. Rough market cost for panels, mounts, and a controller is $1–$2 per watt before labor, and prices vary.
Two to five kilowatt-hours is real energy — it will run LED lighting, a POS tablet, a small drinks cooler, a water pump, and phone chargers all day. It is not in the same league as the kitchen. A truck that thinks of solar as the primary supply will be disappointed by the second lunch rush.
Why the kitchen loads win
A commercial reach-in refrigerator uses roughly 2–4 kWh a day and a chest freezer a bit more, and they run whether you’re open or not. The exhaust hood fan draws 0.3–0.7 kW for every hour of cooking. Any electric cooking appliance — a griddle, a fryer, a soup well, a panini press — pulls 1.5–5 kW while it heats. Add a coffee machine or an ice maker and a busy service day totals 15–40 kWh, which is why most trucks carry a 5–7 kW generator and burn a few gallons of fuel per shift.
Propane cooking changes the arithmetic dramatically: with gas burners, the electrical load drops to refrigeration, the hood fan, lighting, and small appliances, and the daily total can fall to 8–15 kWh. That is still more than the roof makes, but it is a number a battery bank can carry through part of a service. If you are speccing a new build, gas cooking and a lithium bank is the combination that gives solar a meaningful role.
Battery-and-generator hybrids
The practical upgrade is a 5–15 kWh lithium bank with an inverter-charger, charged three ways: overnight from shore power at the commissary, from the generator when it runs, and from the roof panels whenever the sun is out. The generator then runs only during peak cooking, the truck is silent during setup, breakdown, and slow hours, and it can work farmers’ markets and neighborhood events where generator noise is restricted or simply unwelcome. Rough market cost for a system at this scale is $5,000–$20,000 in parts; prices vary widely with battery size.
The roof panels earn their place here: 2–5 kWh a day into a 10 kWh bank is a meaningful share, and on a slow day with propane cooking the generator may not start at all. Have a mobile electrician or an RV-and-fleet shop design and install it; a food truck is inspected, and an unlisted battery installation next to a propane line is not something a health inspector or fire marshal will overlook.
Where the savings really are: the commissary
Most Colorado food trucks rent space in a commissary or operate from a restaurant or commercial kitchen. That building runs walk-in coolers, reach-ins, freezers, and ice machines around the clock, which is a flat, predictable load that rooftop solar matches well, and it usually sits on a flat roof that carries panels easily. If you own or long-term-lease the building, that is a commercial solar project we design and install, typically with a battery where demand charges or refrigeration protection during an outage justify it.
As of September 2026, commercial systems can still claim the federal §48E credit if placed in service by the end of 2027 (or construction begins by July 4, 2026 for a longer window), and 100% bonus depreciation has been restored; storage keeps its eligibility longer. Confirm every detail with your tax advisor. If you rent the commissary, the honest move is to hand the landlord this page — a lower fixed bill is a negotiating point on your rent, and we’re glad to run the numbers for them.
Events, permits, and the truck itself
Event organizers in Denver, Boulder, and Fort Collins increasingly offer shore power at vendor spots, and some restrict generators outright. A battery bank that arrives full lets you take those gigs; a solar roof lets you stretch through a long one. The truck’s electrical work does not go through the same permitting as a building — there is no utility interconnection — but the health department and fire marshal will look at it, and your insurer should know it exists.
Nothing on the truck is something we do. We install grid-tied solar, batteries, and EV chargers on buildings across Colorado, and if your operation ever adds an electric delivery van, a Level 2 charger at the commissary is squarely in our lane. For the truck, find a fleet or RV electrical shop that has done a food truck before and ask to see one they finished.
What to do next
- 1Add up the truck’s electrical loads for a real service day; if cooking is electric, the answer is generator-first regardless of solar.
- 2If the build is new or being redone, choose propane cooking and a 5–15 kWh lithium bank so solar has a job to do.
- 3Fill the roof with whatever fits between the hood fan, vents, and tank cage, and have a fleet or RV electrician wire it.
- 4Plan to charge from shore power at the commissary overnight; that is where the cheap energy is.
- 5If you own or long-term-lease the commissary or kitchen, ask us for a commercial solar and storage proposal on the building.
AI Colorado Solar installs grid-tied solar, batteries and EV chargers on homes and businesses across Colorado; we don’t sell or install the equipment described above. Prices mentioned are broad market ranges, not quotes.
FAQ
Questions we hear
Can solar panels replace my food-truck generator?
No. A truck roof makes roughly 2–5 kWh a day; a service day uses 15–40 kWh with electric cooking. Solar can extend a battery bank so the generator runs fewer hours, especially with propane burners, but it can’t replace it.
What’s the best way to run a quiet food truck at events?
A 5–15 kWh lithium bank charged overnight at the commissary, with the generator held in reserve for peak cooking and roof solar topping the bank during the day. Propane cooking makes the whole plan work far better.
Does the refrigeration really use that much?
A commercial reach-in uses roughly 2–4 kWh a day and runs whether you’re open or not. That alone is close to a full day of roof solar, which is why the truck can’t carry the kitchen on panels.
Are there still tax incentives for solar on my commissary?
As of September 2026, yes for commercial buildings: the federal §48E credit for solar placed in service by the end of 2027, restored bonus depreciation, and longer eligibility for storage. Confirm specifics with your tax advisor.
Do you install solar on food trucks?
No, we don’t work on vehicles. We install grid-tied solar, batteries, and EV chargers on homes and commercial buildings across Colorado, including commissaries and commercial kitchens.
I rent my commissary space. Is there anything solar can do for me?
Indirectly. The landlord’s fixed electric bill is part of what your rent covers. If they put solar on the building, ask for that to show up in your rate. We’re happy to run the numbers for them.