AESV planning tool

Stop Guessing. Size Your Backup Power System in Minutes.

Estimate your backup power needs, battery capacity, solar panel size, and charge-controller rating in a few minutes. Start with your real loads, get a plain-English planning estimate, and use the result to compare the right guides and products.

Start with your real loads

Add appliances or paste a known daily load to get a fast sizing estimate.

See your backup target

Get battery, solar array, and controller guidance in plain English — no jargon first.

Save or compare the result

Email the report, then compare the result with the next AESV guide before you buy.

Best for: homeowner backup planning, solar kit comparisons, and early off-grid sizing.

Step 1

List what you want to power

Choose one input method: list appliances, or use a known daily load if you already have it.

I already know my daily load — use this instead of the appliance listChoose this only if you already know your total daily Wh; otherwise list appliances above. Known daily load (Wh)

1 kWh = 1,000 Wh. A small cabin might use 1,000–3,000 Wh/day; essential home backup often starts around 5,000 Wh/day. When the known-load box is checked, the appliance table is ignored.

Step 2

Choose system settings

Battery voltage Backup days Peak sun hours (rough estimate)

If you don’t know your local peak sun hours, use this rough starting point: sunny regions 5–6, mixed regions 4–5, cloudier regions 3–4. These are planning shortcuts, not exact rules.

Planning note: this calculator gives an educational estimate for early product research. Permanent electrical systems should be checked by a qualified electrician or solar installer.