Posted by jdemaris on April 28, 2009 at 09:54:13 from (67.142.130.23):
I am no math wiz, and never will be.
I want a refrigerator for a small diesel Blazer mini-motorhome I'm building. Special purpose small DC refrigerators cost $1000 or more.
So, I got wondering just how much power the cheap little AC dorm-sized refrigerators use. Keep in mind that my Blazer has 3000 watts of AC power available.
The Blazer has dual deep-cycle storage batteries with a 3000 watt inverter. They provide a total of 225 amp hours at 12.5 volts.
I've tested the refrigerator for two days on 120 VAC and it is using an average of 24 WH per hour (WH being watt/hours). The actual reading I got is - in exactly 12 hours the frig used .27 KWH at 120 VAC. So, I'm figuring .27 KWH = 270 watt hours. 270 watt hours divided by 12.5 volts DC = 21.6 amp hours - correct?
So, I have a pair of deep cycle 6 volt batteries rated at 225 amp hours each. Run in series to make 12.5 volts, the total sum is still 225 amp hours.
So, they can supply 1 amp steadily for 225 hours at 12.5 volts. Also, that means they can supply 21.6 amps for 10.4 hours? Is that correct?
My problem is - every time I sit down and try to figure this out, I get a different answer - so I must me making some mistakes.
I also realize I'll have around 5-10% loss with the inverter, but forget that for now.
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