Generators get you turned away from the best indoor pitches. Wattonomy sizes a clean battery + inverter system for your machines and trading day, with 12V cabling referencing BS 7671 and EN 1648-2 — quiet power for a market hall.
Built to UK (BS 7671) standards · free · no account
A real Wattonomy output — a UK mobile coffee setup
System
24 V
Battery
10.24 kWh
Solar
5000 W
Inverter
MP-II 24/5000
SmartSolar 150/1003×
200W solar panel25×
Battery → inverter cable7×
Battery → inverter fuse1×
Wire & fuse sizes follow EN 1648-2 — each conductor carries its fuse and stays under a 3% voltage drop.
Built to UK (BS 7671) standards
Gauge · fuse · volt-drop sized
Every spec sourced
Plenty of venues simply ban generators.
Indoor markets, halls and a lot of event organisers won’t allow a petrol generator — noise and fumes — which quietly limits where you can earn. A sized battery system trades where they can’t. Wattonomy sizes the bank and inverter to your machines and references BS 7671 for the cabling so it holds up to scrutiny.
What a mobile coffee setup needs to get right.
Quiet, legal-to-pitch power that actually lasts the day.
Trading-day energy
Espresso, grinder, a fridge for the milk, lights and card machine — summed as real Wh for a UK trading day.
Inverter for surge
Sized to start the espresso boiler, with headroom so it never cuts out at the worst moment.
Battery + winter charging
A bank sized to the day, with solar plus alternator/EHU charging — honest about how little UK winter sun delivers.
BS 7671 cabling
12V cable and fusing sized referencing BS 7671 and EN 1648-2; any 230V hook-up side installed and certified by a registered electrician.
What you walk away with — free
A battery + inverter system sized to your machines and trading day
A wiring diagram with every cable gauge and fuse
12V cabling and fusing sized referencing BS 7671 / EN 1648-2
A parts list you can take to any UK supplier
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 van
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 run a mobile coffee van on battery in the UK?
For a single-group setup, yes — a sized battery and inverter run it silently and let you pitch where generators are banned. Many UK traders keep gas for the boiler and battery for everything else; the tool sizes the electrical side either way.
Will solar be enough in a UK winter?
Usually not on its own — UK December sun is very low. The tool sizes a bank plus alternator/EHU charging and shows when you’ll need to plug in, rather than selling you panels that won’t deliver.
Is the wiring to UK standards?
The 12V cabling and fusing are sized referencing BS 7671 and EN 1648-2. The 230V hook-up side should be installed and certified by a registered electrician.
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.
BS 7671The UK IET Wiring Regulations for the 230 V side.
EN 1648-2The European standard for 12 V electrics in leisure vehicles.
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 EN 1648-2. 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