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Solar Food Truck Calculator

Enter your truck roof size and appliances — get panels that fit, supplemental panels needed, battery for evening service, and annual savings vs generator.

Truck roof dimensions
ft
ft
hrs
$/gal
Appliances on the truck
Solar system for your food truck
10 × 400W panels · 16.6 kWh/day load
Total connected load2.75 kW
Daily energy (with duty cycles)16.6 kWh/day
Roof area112 sq ft
Panels that fit on roof6 panels (2.4 kW)
Supplemental panels needed+4 ground/awning panels
Battery for evening service87 Ah @ 48V (3.3 kWh)
Annual fuel savings vs generator$6,640/yr
Est. system cost$15,700
ROI timeline2.4 yrs
Noise reductionGenerator eliminated
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How to Use This Calculator

Enter your truck dimensions and operating hours

Start with the roof length and width of your food truck — this determines how many 400W panels physically fit on the roof. A typical 16 ft food truck with a 7 ft roof can fit about 6-7 panels. Then enter your daily operating hours (including prep time), fuel cost for comparison against your generator, and your nearest city for peak sun hours.

Select your appliances

Check each appliance installed on your truck. The calculator applies realistic duty cycles: cooking appliances (griddle, fryer, microwave) run at about 50% duty cycle since they cycle on and off; refrigeration and fans run at roughly 80%. This gives a realistic daily kWh load rather than worst-case peak draw.

Read the results

The output shows your total connected load (kW), daily energy usage (kWh), how many panels fit on the roof vs how many you need, any supplemental panels required (awning or ground-mounted), battery size for evening service, and the annual savings vs running a diesel generator. The ROI compares system cost against fuel savings.

The Formula

Total Load (kW) = Sum of all appliance watts ÷ 1000 Daily kWh = Σ(Appliance W × Operating Hours × Duty Cycle) ÷ 1000 Panels Fit on Roof = Floor(Roof Length × Width ÷ 17.6 sq ft per panel) Panels Needed = Ceiling(Daily kWh × 1000 ÷ PSH ÷ 0.80 ÷ 400W) Supplemental Panels = max(0, Panels Needed − Panels on Roof) Battery Ah (48V) = Daily kWh × 0.20 × 1000 ÷ (48V × 0.80 DoD) Annual Fuel Savings = (Daily kWh × 300 days) ÷ 3.0 kWh/gal × Fuel Price ROI = System Cost ÷ Annual Fuel Savings

Duty cycles used: griddle/fryer/microwave = 50%; refrigeration, fans, lights, POS = 80%. These reflect typical intermittent cooking loads. The battery covers roughly 20% of daily load for evening service after the sun sets. Annual savings assume 300 operating days per year and a generator efficiency of 3.0 kWh per gallon of diesel.

Example

Maria's Taco Truck — Dallas, TX

Maria runs a taco truck 10 hours per day with a commercial fridge, flat-top griddle, microwave, POS, LED lights, exhaust fan, and water pump. Her roof is 16 ft × 7 ft and she currently spends $400/month on diesel fuel.

Roof16 ft × 7 ft = 112 sq ft
LocationDallas, TX (5.4 PSH)
Fuel cost$4.00/gal diesel
Daily load~22 kWh/day

Result

Total connected load2.75 kW
Panels on roof6 panels (2.4 kW)
Supplemental needed+4 awning panels
Battery for evening~47 Ah @ 48V
Annual fuel savings~$2,200/yr
System cost~$12,000
ROI~5.5 years

Maria's roof covers 6 panels (2.4 kW) — enough for refrigeration and lighting but not the full load. Adding 4 retractable awning-mounted panels brings the system to full capacity. After 5.5 years the panels pay for themselves in fuel savings alone; the truck is also quieter and compliant in noise-restricted parks.

FAQ

Yes, with the right setup — though it depends heavily on the load. A coffee or beverage truck with a fridge, POS, and LED lights (total ~600W) can run entirely on 2-3 roof panels in a sunny location. A full kitchen with griddle and deep fryer (~7kW peak) needs 15-20 panels, which exceeds most truck roofs — requiring awning-mounted panels or a hybrid solar-generator approach where solar handles refrigeration and lighting while a small generator handles peak cooking loads.
A standard 400W solar panel measures approximately 6.5 ft × 3.3 ft (about 21 sq ft including spacing). A 16 ft food truck with a 7 ft usable roof (112 sq ft) fits 5-6 panels. A 20 ft truck can fit 7-8 panels. Deduct area for exhaust vents, hood fans, and HVAC units. Retractable solar awnings can double effective panel area when parked, adding another 4-8 panels on each side.
Battery sizing depends on how long you operate after sunset and which loads you need covered. A coffee truck running 2 hours of evening service needs about 1.2 kWh (roughly 31 Ah at 48V). A taco truck with evening service needs 2-3 kWh. Use LiFePO4 (lithium iron phosphate) batteries — they handle the vibration, temperature swings, and daily cycling that food trucks demand far better than lead-acid alternatives.
A basic system for a coffee truck (4 panels + small battery + inverter) runs $3,000-5,000. A full kitchen system with 10+ panels, large battery bank, and a hybrid inverter-charger runs $10,000-18,000. Installation adds $2,000-3,500 depending on truck modifications needed. Commercial solar installers who specialize in mobile applications will waterproof the roof penetrations and integrate with existing electrical systems. Most operators recover costs in 4-7 years through eliminated fuel and generator maintenance costs.
Yes — and solar food trucks are increasingly preferred. Many farmers markets, municipal parks, and festival venues are moving to require or reward low-noise, low-emission trucks. Solar eliminates generator noise (a major complaint at markets) and exhaust fumes near food. Some cities like Los Angeles and New York offer preferential permit placement for zero-emission food trucks. Check your local health department requirements — your electrical system still needs to meet commercial kitchen codes, but solar components themselves are universally permitted.

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<iframe src="https://solarsizecalculator.com/solar-food-truck-calculator"
  width="100%" height="700" frameborder="0"
  title="Solar Food Truck Calculator"></iframe>