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Arizona 12V Off-Grid Solar Battery Calculator (6.5 Sun Hours)

Size battery Ah and panel watts for Arizona conditions at 12V using 6.5 peak sun hours and 1-day backup assumptions.

Load Breakdown

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

Regional Sun-Window Guidance

High irradiance region with strong summer output.

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.

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FAQ

12V solar setup: how many battery Ah do I need?

For this load profile, estimated LIFEPO4 bank sizing is 279.8 Ah at 12V with 1-day autonomy.

How many watts of solar panels are required for 6.5 peak sun hours?

The calculator estimates 583 W panel capacity after charge and derate factors.

Why does lower battery voltage usually require higher Ah?

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

Should I oversize panels or batteries first?

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