Generators run at the volume of a lawnmower beside your booth, and more markets cap noise or ban them outright. A silent battery system is welcome everywhere — Wattonomy sizes it to your real loads so it lasts the day, no engine, no fuel.
A real Wattonomy output — a silent stall power pack
System
12 V
Battery
2.56 kWh
Solar
600 W
Inverter
MP 12/2000 120V
SmartSolar 100/501×
200W solar panel3×
Battery → inverter cable4×
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
A loud generator can cost you the good pitches.
Markets and events increasingly enforce noise caps or ban generators outright — and the rules change year to year. A whisper-quiet battery system trades wherever you go. Wattonomy sizes the bank to carry your loads all day and sizes every cable and fuse to carry its load, to ABYC E-11.
A silent stall system in four numbers.
Quiet, allowed-everywhere power that lasts the whole day.
Trading-day energy
Lights, a cooler, the card reader, a fan and charging — summed as real Wh for a full day.
Battery to last
Sized to the day on an honest depth-of-discharge — no dead pack mid-afternoon.
Surge headroom
Sized so a compressor or kettle start-up never trips the inverter at the worst moment.
Cables & fuses
Every gauge and fuse sized to its load and run length, to ABYC E-11.
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 stall
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
How loud is a generator vs a battery system?
Petrol generators run around 80–100 dB — a lawnmower next to your booth — while a battery system is silent. Many markets cap noise near 60 dB or ban generators, so silent power simply lets you trade where they can’t.
Will a battery actually last a full market day?
Sized properly, yes — the tool sizes the bank to your real loads and trading hours with honest reserve, instead of the optimistic rating on a portable power station.
Can I still run a cooler or small appliances?
Yes — the tool sizes for their start-up surge and is honest when a high-draw item needs a bigger inverter or bank.
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