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Old 06-07-2016, 11:53 PM   #1
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Residential refrigerator and batteries

My Columbus has two 12 volt batteries and a converter for the residential refrigerator. When the batteries have been fully charged how long can I expect them to last operating the refrigerator alone.
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Old 06-08-2016, 12:18 AM   #2
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Inverter not converter.

What size batteries?


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Old 06-08-2016, 10:41 AM   #3
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Depends how much it runs in an hour. Say you have 100 amps in each battery. If you want your batteries to last any length of time then don't discharge them under 50% so you really have100 available amps before recharging. Fridge probably uses about 4 amps AC so that equates to 40 amps DC. If it runs 15 minutes each hour then that is 10 amps per hour for a total of 10 hours. If it runs 5 minutes each hour you can get 30 hours.


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Old 06-08-2016, 11:36 AM   #4
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I got 17 hours with two 12v cheap hybrid batteries, still pulled in six slides but then didn't have enough juice to retract the 6-point levelers.
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Old 06-08-2016, 05:46 PM   #5
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I have a Frigudaire Gallery in my 3250 Cardinal. I upgraded the batteries to 4 6V Trojans. If I have them fully charged before bed I'm down to 50% charge 10 hrs later. I tried it overnight with just one bank and they were completely drained in the morning.
This fridge pulls about 800w per the manual so I need my 2 Honda 2000 generators a few times a day plus I have a 400W solar panel on my roof.
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Old 06-08-2016, 11:20 PM   #6
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Thank you for the replies. My batteries are 700 Intersate Marine and both are drained in approximately 5 hours. So back to the dealer to see what he can do for me.
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Old 06-09-2016, 08:42 AM   #7
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800 watts is a 66.6 amp draw. That will drain batteries pretty fast.


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Old 06-09-2016, 09:03 AM   #8
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Quote:
Originally Posted by lbrjet View Post
800 watts is a 66.6 amp draw. That will drain batteries pretty fast.
Sure 800 watts is a lot, but you need to consider the duty factor and you can get that from the Energy Star rating of your unit.

Energy Star


Measurements taken at Ambient Temp of 90 F
Annual Power Usage is 539 KWH/Year
At 100% running this would mean 8664 KWH/Year
Thus it really runs 6% of the time...
At 6% Duty Factor it uses 1477 WattsDay
At 6% Duty Factor it 62 Watt Hours, which is about 5 amps average load. That would be 10 hours for a single 100 AH battery to 50%, which pretty much matches what many report.
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Old 06-09-2016, 11:52 AM   #9
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I don't know of any fridge that runs only 6 percent of the time. Maybe on a setting of 1.


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Old 06-09-2016, 12:10 PM   #10
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I don't know of any fridge that runs only 6 percent of the time. Maybe on a setting of 1.
Well the DOE is pretty difficult about Energy Star numbers. All of my data is taken directly from the Energy Star test requirements, including the ambient temperature spec. The power dissipation is directly from their reefer specifications and the Energy Star value is right off the sticker. Not really any way to figure it differently from an math point of view. Of course, when you start up the duty factor is more like 100% for maybe 6 or 8 hours.

Besides, the 6% number works pretty well with everybody's experience with a reliable battery and a good inverter...so...where is the problem? Frankly I would have never guessed as low as 6% and most of these units don't have numbers anymore, they have temperature settings. Mine is on 0 degrees for the freezer and 40 degrees for the reefer portion.
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