Free tool · takes about 3 minutes

Size your solar & battery system before you buy anything.

Check off what you run, and the panel on the right does the math — daily energy use, battery bank size, solar array size, and inverter rating.

Runs directly off the battery (12V) — doesn't need the inverter Heavy load — worth a second look before you size around it

System Readout

CALCULATING…
Daily energy use
0 Wh/day
Battery bank needed
0 Ah
Usable capacity
0 kWh
Solar array needed
0 W
Inverter — continuous
0 W
Inverter — surge
0 W
2 days
4.5 hrs

Get your exact component list

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Your shopping list

Battery bank
Sized for your chosen chemistry, voltage, and autonomy days.
Solar array
Based on your average sun hours, with a derate for real-world losses.
Inverter
Continuous rating shown — check the surge number if you run motors or compressors.