Battery / Solar Panel Size for Fridges

BATTERY & SOLAR PANEL SIZING CHART FOR 12V FRIDGES

This guide has been developed to provide at least 3 days running power with a maximum battery discharge of 60% with zero sunshine.

The solar panels noted below will have the ability to bring your batteries back to 100% with a full day of sunshine. For lithium batteries, only 60% of the AGM battery capacity (Ah) is required.

Generally, slightly less than double the Ah battery storage is recommended in watts of solar when matching solar panels with batteries. Eg: a 100Ah battery would require approximately 200watts of solar.

Please note: all values are approximate. Generally, the amount of battery and solar needed has been over estimated.

Fridge	1hr (Ah)	1 Day (Ah)	3 Days (Ah)	AGM Battery Size (60% Discharge after 3 days)	Solar Panels
35 - 52L	0.8	20	60	100Ah	200W
50 - 65L	1.0	24	72	120Ah	200W
85L	1.3	30	90	150Ah	300W
130L	1.5	36	108	180Ah	300W
190L	2.0	48	144	240Ah	400W
285L	2.4	57	172	260Ah	400W