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How big a battery and solar setup does my van actually need?

Add what you'll run and how long you'll run it. This works out your daily energy, then sizes your battery bank, solar array, inverter and main fuse — the calculation that makes or breaks off-grid life.

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1. What will you run?

Tap the common ones to add them, then adjust the hours to match how you'd really use it.

Appliance	Watts	Hrs/day	Wh/day

Nothing added yet — tap a few above to get started.

Anything drawing 800W or more is treated as a mains (AC) appliance and will size an inverter for you.

2. How do you travel?

Defaults are sensible for UK and European touring. Nudge them to your reality.

Days off-grid before recharging — 2 Usable peak-sun hours per day — 3.5 Battery chemistry

Peak-sun hours are not daylight hours. UK winter is roughly 1, UK summer 4–5, southern Europe in summer around 6. Size for the worst month you'll actually be off-grid in — not the best.

3. Your system

Updates as you type. These are the numbers to take shopping.

That's one of seven tools.

The Electrical Sizer is free and always will be. The rest of KITTED plans the whole conversion — so the build doesn't quietly become an £11,000 build.

⚖ Weight & payload — stay legal
£ Budget builder
◇ Water system planner
▦ Layout planner
▤ 29-step build order
✦ 19-guide knowledge vault

See the full system →

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