How much solar and battery to run an induction cooktop in a sailboat?
An induction cooktop draws a big surge the moment it heats. In a sailboat it uses about 400 Wh a day. Wattonomy sizes the battery (5.12 kWh), the solar (400 W) and every cable around it to ABYC E-11, then hands you the wiring diagram and a shoppable parts list.
A real Wattonomy output — a sailboat running an induction cooktop
System
12 V
Battery
5.12 kWh
Solar
400 W
Inverter
MP-II 12/3000 12
SmartSolar 150/351×
200W solar panel2×
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 E-11 standards
Gauge · fuse · volt-drop sized
Every spec sourced
Induction is a surge problem, not an energy one.
An induction hob pulls roughly 1,600 to 1,800 W the instant it heats. Size the inverter and cable for that surge or it cuts out mid-cook. Wattonomy sizes the bank, solar and every cable around it, to ABYC E-11.
What it takes to run an induction cooktop
Real numbers from a sized sailboat build, not rules of thumb.
Daily energy
About 400 Wh a day for the induction cooktop itself, the figure everything else is sized from.
Battery
About 5.12 kWh of LiFePO4 (roughly 427 Ah at 12V) to carry it through the night and a cloudy day.
Solar to replace it
About 400 W of panel replaces a day’s use in fair sun; poor light or winter wants more, or a second charging source.
Inverter and surge
Sized to start the 1800 W surge cleanly: MultiPlus-II 12/3000 120V, with cable to match, to ABYC E-11.
What you walk away with — free
A full system sized to run your induction cooktop — battery, solar and inverter
A real wiring diagram with cable gauges and fuses
Cable and fuse sizing with the voltage drop checked, to ABYC E-11
A shoppable parts list, every line traceable to a standard or datasheet
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 build
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 many watts does an induction cooktop use?
An induction cooktop runs at about 1600 W and can surge to roughly 1800 W on start-up, using around 400 Wh over a day. The inverter has to cover that surge, not just the running watts.
What size battery runs an induction cooktop in a sailboat?
For this build Wattonomy sizes about 5.12 kWh (roughly 427 Ah at 12V) of LiFePO4 — enough to carry the induction cooktop plus your basics through the night and a cloudy day. Your exact number depends on how many days of backup you want.
How much solar do I need to run an induction cooktop?
About 400 W of panel replaces a day’s use in fair sun; poor light, winter or shade wants more, or a second charging source such as a DC-DC charger off the engine. The tool sizes it from your climate.
Is this sized to US standards?
Yes. Every cable, fuse and busbar is sized to ABYC E-11 using AWG, at the 12/24V DC and 120V AC typical of the US systems. Nothing here is a rule of thumb.
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