If I use 50%, or 1800 Watts, I can run my 18Ft/ Fridge (500 Watts) for 3+ hours. It would take me 8-10 days to recharge the batteries to full. Cost 320.00 ( or 420.00 with Inverter)
500W for a Fridge!! Your energy bills must be enormous especially if you need aircon to remove the heat generated by your fridge.
Thats 4380 kWhrs/year!! That would cost me around $800-900 a year to run in the UK.
The Vestfrost SE225 A++ Chest Freezer @ 8 cubic feet is available for 172 kWhrs/year whilst another Vestfrost SE225 operating as a chest fridge would work out around 36 kWhrs/year. The Vestfrost SE225 also has a 50 hour specification for the internal temperature rise from -18C to ambient temperature.
http://www.builditsolar.com/Projects/Conservation/chest_fridge.pdfTotal Yearly energy usage would be less than 250kWhrs/year or around 16-17 times less than your current refrigeration.
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