Food Trucks · Generator vs Battery vs Solar · Honest Numbers
Food Truck Generator vs Battery Power
Real numbers on generators, battery banks and rooftop solar, from the people who fix the equipment on both kinds of trucks. We don't sell conversions. We repair what breaks after them.
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Food Truck Power Systems
Southern California
01 · Why this question comes up
Nobody wants a generator. Most trucks still run one.
We get asked about batteries and solar at commissaries all the time, usually by an operator who just got turned away from a market. The reasons are real. A lot of event organizers and farmers markets around Los Angeles restrict or ban generators because of the noise. The exhaust ends up right where customers stand at the service window. Fuel costs money every day, has to be hauled and stored, and the generator itself needs oil changes and repairs.
A battery system fixes those three problems. It also creates new ones, and it costs a lot more than the ads suggest. We're not in the conversion business. We don't sell battery systems, and we don't earn anything when you pick one over the other. What we do is repair the griddles, fryers, fridges and ice machines on trucks running both. That gives us a clear view of what each power setup does to the equipment. This page is part of our food truck equipment repair service.
02 · The solar math
A truck roof can't power a truck kitchen.
Start with the roof. A 16 to 22 foot food truck has room for roughly 600 to 1,200 watts of solar panels once you work around the exhaust fan, vents and AC. In Los Angeles sun, that makes about 3 to 5 kWh on a good day.
Now the kitchen. A working shift on a truck typically uses 15 to 40 kWh. Refrigeration runs all day. Add lights, water pump, hood fan, POS, maybe an ice machine, and electric cooking equipment if you have any, and you're at the top of that range fast.
| Item | Typical number |
|---|---|
| Truck roof length | 16 to 22 ft |
| Solar that fits on it | 600 to 1,200 W |
| Solar energy per day in LA | about 3 to 5 kWh |
| Energy one working shift uses | 15 to 40 kWh |
| Share solar can cover | about 10 to 25 percent, not more |
So when you see a "solar food truck," the panels are not what's running it. Solar is a bonus that stretches the battery, not a power source you can plan a shift around.
03 · What's actually being sold
A "solar truck" is really a battery truck.
What gets sold as a solar setup is a lithium iron phosphate (LiFePO4) battery bank, usually somewhere between 10 and 30 kWh, plus an inverter that turns battery power into the 120 or 240 volt AC your equipment expects. The bank charges overnight on shore power at the commissary. The roof panels add a little during the day. The cooking still runs on propane in most setups, because heating with batteries eats capacity fast.
The hardware alone runs roughly $8,000 to $25,000, before installation. That price is why only a minority of operators make the switch, and why the ones who do sometimes cut corners on the parts that matter most to the equipment: inverter size and inverter waveform.
Generator vs battery, side by side
| Generator | Battery bank + inverter | |
|---|---|---|
| Noise and exhaust | Loud, exhaust near the window | Quiet, no exhaust |
| How long it runs | As long as there's fuel | Until the stored kWh are used up |
| Compressor starts | Handles them if sized right | Limited by the inverter's surge rating |
| Power quality | Clean on inverter generators, rough on many open-frame units | Clean on pure sine inverters, harmful on modified sine |
| Upfront cost | Lower | $8,000 to $25,000 in hardware |
| Ongoing | Fuel, oil, engine repairs | Shore power charging, system service by the installer |
Neither one is automatically better for your equipment. A well-sized inverter generator and a well-built pure sine battery system can both run a truck kitchen cleanly. A bad example of either will kill compressors and control boards.
04 · What breaks after the switch
What breaks after a truck switches to batteries.
These are the failures that bring us to trucks after a conversion. None of them start in the fridge or the ice machine, but that's where they show up.
A modified sine wave inverter
Cheaper inverters put out a modified sine wave: a stepped approximation of utility power instead of a smooth curve. Simple heaters don't care. Electronic temperature controllers, control boards on ice machines and newer refrigeration, and electronically commutated fan motors do. They run hot, buzz, act erratically and fail early. Compressors run hotter on it too. When a truck that was fine on a generator starts losing control boards after a battery install, the inverter's waveform is the first thing we ask about.
An inverter too small for the starting current
Every compressor pulls several times its running current for the first moment of a start. An inverter has a continuous rating and a shorter surge rating, and the surge rating is the one that matters here. If it can't cover a compressor start, or two compressors starting at the same moment, the inverter faults and shuts down, or the voltage collapses and the compressor stalls and trips on its overload. From the kitchen it looks like a fridge that randomly stops cooling. Repeated failed starts wear out start components and eventually the compressor.
Voltage sag under load
A battery system doesn't hold perfect voltage all day. Output can dip under heavy draw and as the bank runs down, and when the battery management system hits its limit, it cuts power entirely. The pattern is recognizable: equipment fine in the morning, struggling by mid-afternoon, dead near the end of a long event. Undersized or loose battery cables make it worse.
Why the diagnostic starts with a voltmeter
This is where a lot of money gets wasted. A warm fridge on a converted truck gets a new compressor, the new compressor fails the same way, and nobody ever measured the power. Our diagnostic starts with a voltmeter at the outlet under real load, watching what happens during a compressor start. We check the inverter's labeled waveform and its continuous and surge ratings against the equipment it's feeding. Then we look at the fridge. If the equipment was damaged by the power, we repair the equipment. If the power is still the problem, we write the readings down for your installer, so the same part doesn't fail twice.
For the full step-by-step on warm refrigeration, including generator power, condensers and vibration leaks, see food truck fridge not cooling.
05 · Our scope
What we do here, and what we don't.
What we do
- Repair refrigeration, prep tables, ice machines, griddles, fryers and ranges on the truck.
- Find out whether a failure came from the power, with measurements at the outlet under load.
- Give you written readings to hand to your installer, electrician or generator shop.
What we don't do
- Design, sell or install battery systems or solar panels.
- Service inverters, battery banks, charge controllers or transfer switches.
- Repair generators themselves.
If you're still deciding, ask the installer these questions
- Is the inverter pure sine wave? Get it in writing.
- What's its surge rating, and does it cover every compressor on the truck that can start at the same time?
- How many usable kWh does the bank hold, compared with what your shift actually uses?
- How does it charge at your commissary, and how long does a full charge take?
- Who services the system when it misbehaves at an event?
Straight answers to those five questions protect your equipment more than the panels on the roof do. And if something on the truck stops working either way, the diagnostic is $120, waived when you approve the repair.
06 · FAQ
Generator vs battery questions.
Can solar panels alone run a food truck?
No. A 16 to 22 foot truck roof fits roughly 600 to 1,200 watts of panels, which makes about 3 to 5 kWh on a typical Los Angeles day. A working shift on a truck uses 15 to 40 kWh. Solar covers somewhere around 10 to 25 percent of that at best. What runs the truck is the battery bank, charged from shore power at the commissary; the panels only top it up.
Is a battery system allowed where generators aren't?
A battery bank with an inverter is quiet and has no exhaust, which is the whole reason operators look at it for events and farmers markets that restrict or ban generators. The rules belong to each market, event organizer or property, though, so confirm with them before you spend the money. We repair equipment; we can't tell you what a given organizer allows.
My fridge started failing after we switched to batteries. Is it the fridge?
Often it isn't. The usual causes are an inverter putting out a modified sine wave, an inverter too small for the compressor's starting current, or voltage sagging as the bank drains under load. Our diagnostic starts with a voltmeter at the outlet during a compressor start, not with a new compressor. If the power is the cause, we show you the readings to take to your installer.
Do you install battery banks, inverters or solar panels on food trucks?
No. We don't design, sell or install battery systems, inverters, charge controllers or solar panels, and we don't service them. We repair the cooking and refrigeration equipment on the truck, including when the failure was caused by the power system, and we tell you plainly when the fix belongs to your installer.
What does a diagnostic cost if something on the truck stops working?
The diagnostic is $120, and it's waived when you approve the repair. Same-day service is available across Los Angeles, usually at your commissary, and phones are answered 24/7. You get a written quote before any part is ordered.
07 · Related
More food truck service.
Equipment acting up after a power change? Call now.
$120 diagnostic, waived with repair. Mon–Sat 8am–8pm · Sun closed · Phone answered 24/7.