MNtundraRet wrote:
bob b:
Your refrigerator runs 24 hours per day. The sticker you used would account for that. Even using the calculations you gave the number would be 70 amps per 24 hour period. That's not accounting for inverter overhead or any other normal use.
That's why my standard 6 c.f. refrigerator only runs on 120v AC or propane.
Yep. Calculations were wrong, watt-hours instead of watts, but it still comes to 854.7/12=71 AH a day plus 10% inverter loss. Plus, residential use assumes residential 77F room temperature, while in trailer there can be up to 100, especially when you're outside and no fans are running. Count on at least 80 AH per 24 hours.
Plus, other loads - even without 120v loads like microwave you need at least 30-40 AH just to get by. This is 120 AH per 24 hours. So a pair of GC batts will last 24 hours before the charge drops below 50%.
It should be mentioned here that "standard 6 c.f. refrigerator" in RV is a totally different creature, it is an absorption machine with heater, rather than compressor machine. In 120V they draw a lot more power than residential 120V fridge. Still, 120V residential is a power hog, it won't last long on batteries.
