Solar pSEO Landing

California 12V Off-Grid Solar Calculator P3

Profile 3: size battery Ah and panel watts for California conditions at 12V using 5.4 peak sun hours and 1-day backup.

Sizing Snapshot

Daily Energy

2780 Wh

Battery Bank

279.8 Ah

Solar Array

702 W

Inverter Baseline

375 W

Appliance	Power	Daily Runtime	Wh/Day
Fridge (60W x 24h)	60 W	24.00 h	1440 Wh
Starlink (75W x 8h)	75 W	8.00 h	600 Wh
Laptop (90W x 6h)	90 W	6.00 h	540 Wh
LED Lights (40W x 5h)	40 W	5.00 h	200 Wh

Strong annual sun profile with stable planning assumptions.

Use local monthly irradiance data to tune peak-sun-hour assumptions before procurement.

Cloud-prone months usually benefit from higher autonomy targets and larger reserve buffers.

For winter-heavy climates, panel overbuild is often cheaper than repeated battery deep cycles.

For the same energy demand, lower voltage systems need more current. That translates into larger Ah requirements and often thicker cabling.

In low-sun conditions, panel oversizing usually improves daily recovery. In high-cloud windows, additional battery autonomy reduces outage risk.

Yes, the model applies chemistry-specific assumptions for DoD and charging to keep estimates closer to practical planning ranges.

Use this for planning and shortlist decisions, then validate with measured appliance duty cycles and local irradiance history.