How to choose the right size 12v battery and solar panels for a 12V fridge
A quick guide to get you headed in the right direction.
BATTERY & SOLAR PANEL SIZING CHART FOR BUSHMAN 12V FRIDGES
This guide will give you at least 3 days running with absolutely zero sunshine and a maximum battery discharge of 60%.
The solar panels are sized to charge your batteries back to 100% after a full day of sunshine, perfect. As a rule of thumb, we recommend slightly less than double the Ah of battery storage in watts of solar. So a 100Ah battery would have approximately 200 watts of solar.
For lithium batteries you will only need 60% of the AGM battery capacity in Ah shown below.
|FRIDGE||1hr (Ah)||1 Day (Ah)||3 Days (Ah)||AGM BATTERY SIZE (60% DISCHARGE AFTER 3 DAYS)||SOLAR PANELS|
|SC35-52||0.8||20||60||100 Ah||200 W|
|DC50 + DC65||1.0||24||72||120 Ah||200 W|
|DC85-X||1.3||30||90||150 Ah||300 W|
|DC130-X||1.5||36||108||180 Ah||300 W|
|DC190-L||2.0||48||144||240 Ah||400 W|
|DC285-L||2.4||57||172||260 Ah||400 W|
All values are approximate. If anything, we over estimate the amount of battery and solar you will need.