The generator is the loud, smelly, banned-at-the-good-spots part of the job. Tell Wattonomy what you run — espresso, fridge, blender, lights — and it sizes a silent battery system for every machine’s surge, draws the wiring, and lists the parts.
A real Wattonomy output — a coffee-forward food truck
System
24 V
Battery
10.24 kWh
Solar
1400 W
Inverter
MP-II 24/5000 12
SmartSolar 250/701×
200W solar panel7×
Battery → inverter cable7×
Battery → inverter fuse1×
Wire & fuse sizes follow ABYC E-11 — each conductor carries its fuse and stays under a 3% voltage drop.
Built to ABYC standards
Gauge · fuse · volt-drop sized
Every spec sourced
Your espresso machine trips the inverter — then service stops.
Boilers and compressors spike far above their running watts the instant they switch on. Size the inverter for running watts only and it shuts down mid-order. Wattonomy sizes the inverter for the start-up surge, flags the machines that each need their own circuit, and sizes every cable to carry its fuse — to ABYC E-11, with the voltage drop checked.
A food-truck power system in four numbers.
Get one wrong and you trip mid-service — or overspend by thousands on a bank you don’t need.
Service-day energy
Espresso duty-cycle, refrigeration around the clock, lights and POS — added up as real Wh for a full trading day, not a sticker rating.
Inverter for surge
Sized to start your heaviest machines, not just run them — so the boiler and the fridge compressor never trip it.
Battery + charging
A bank that carries refrigeration overnight, with solar plus charge-while-you-drive sized to your climate and trading days.
Cables, fuses & circuits
Every gauge and fuse matched to its load, with the machines that need their own dedicated 20A circuit called out.
What you walk away with — free
A validated system sized to your equipment — not a one-size kit
A clean wiring diagram with every cable gauge and fuse spelled out
Cable & fuse sizing with the voltage-drop checked for your run lengths
A shoppable parts list, each line traceable to ABYC or Victron specs
Building it for real? Unlock the build binder.
Free gets you a safe, correctly-sized design. The build binder gets you the documents to build it right — and prove it's right.
Printable wiring diagram, yours to keep & tape inside the truck
Full parts list, every line sourced
The volt-drop & fusing calculation trail — the "why" behind every spec
The build binder is a one-time unlock — no subscription, no auto-renew.
Questions
Can I really run a food truck on battery instead of a generator?
A coffee-forward truck on a single 120V inverter, yes — silent, no fumes, welcome where generators are banned. A full kitchen with a two-group espresso machine or big simultaneous loads is a 120/240V split-phase build; the tool tells you the moment you cross that line and points you to a licensed electrician for the AC stage.
Will it size for the start-up surge?
Yes. Every machine carries its surge, the inverter is sized to start them, and the tool suggests staggering start-ups or a soft-starter on compressors so you can run a smaller inverter if you want.
Which machines need their own circuit?
The tool flags the ones manufacturers and the standards want on a dedicated 20A circuit — typically the espresso machine, a commercial blender and any heater — so two heavy loads never share and trip.
Do I need an account?
No. Design the whole system free, no email required. Accounts are only for saving builds or the printable build binder.
Is this just trying to sell me a kit?
No. The parts list is vendor-neutral and standards-referenced — buy the components anywhere. We make the design, not the markup.
The standards we build to
Plain version: these are the recognized rulebooks your design is sized against, so the numbers hold up to a surveyor, an inspector or an insurer.
ABYC E-11The US standard for AC & DC wiring on boats — what a surveyor or insurer actually checks.
Wattonomy applies these standards in its calculations. It is not certified, sponsored or endorsed by ABYC, ISO, NFPA or Victron — it sizes your design to meet what they require, and shows the working.
Sized and checked to ABYC E-11. Last reviewed June 2026 — see the full methodology for the exact rules behind every number and how each design is validated.
Built by anABYC Certified Master Technician