Quote:
Originally Posted by Thehobe1
A large, group 27 deep cycle battery has typically 100AH capacity. A brand new, in spec group 27 battery would provide 100AH/3.2A= 31.25 Hours of refrigeration if that was the ONLY load for this type of refrigerator. 2 batteries would provide 62.5/24 or 2.6 days of power again, if this were the only load on the 12V batteries AND they are brand new. ...
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... and you don't want them to last long... Otherwise figure your calculations on using 50% of the available capacity on regular basis. Occasional deeper discharge may be tolerated, but a steady diet to zero will dramatically shorten the life.
Reality the 2 battery solution would be just over a days use - and that still assumes it is the only load which also isn't likely reality.