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Old 12-31-2019, 11:49 AM   #1
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OEM Battery Life

Anyone have an idea whether a single, fully charged lead acid battery will sustain the fridge (Dometic 6 cu. foot) for 12 hours? I understand the CO/Propane detector also draws on the battery.
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Old 12-31-2019, 01:35 PM   #2
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There are too many variables involved. The age and prior treatment of the battery. The external temperature of the RV. The amount of food in the fridge. Is the fridge a compressor or multi fuel? ETC, ETC, ETC.

Here's the only sure way to know... try it and see.
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Old 12-31-2019, 01:45 PM   #3
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Exactly. Type of battery (wet, GEL, AGM), is it deep cycle or hybrid, will all affect the outcome as well. Draw from the fridge on the battery becomes the next ? in the equation, and that is model specific, usually.

As cp suggests, try it and see.
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Old 12-31-2019, 05:51 PM   #4
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And then there is also the question of what is happening during this twelve hours as a single opening of the frig can blow the numbers we might have come up with. During power outages, the worst thing we can do is open the frig to see if it has started to melt yet!
I would tend to say it would work overnight if the door is not opened and the battery is in good shape but then it will depend a whole bunch on how hot the RV.
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Old 12-31-2019, 05:56 PM   #5
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Quote:
Originally Posted by wcedwards View Post
Anyone have an idea whether a single, fully charged lead acid battery will sustain the fridge (Dometic 6 cu. foot) for 12 hours? I understand the CO/Propane detector also draws on the battery.
If you are asking if a single battery will operate the fridge on A/C power through an inverter for 12 hours, the answer is: Most likely not. If it does manage to power it for 12 hours the battery will be pretty close to completely discharged. Not good for long life for the battery.
If you are asking if the battery will power the refrigerator's control board while operating in the propane mode, the yes it will. It will also operate the fridge for many days while in the propane mode.
The control board pulls about 0.2 amps per hour, so even a single 70AH (Amp Hour) battery will operate it for a long time.
About the propane detector: it pulls less than 0.1 amps.
You should not have a CO/Propane detector. The CO detector should be mounted on the ceiling or near the ceiling and the propane detector down near the floor. CO rises to the ceiling and Propane settles to the floor. CO detectors many or most times are self contained battery operated devices
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Old 01-05-2020, 05:10 PM   #6
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Short answer: I doubt it. You don't want to drain below 50% SOC (state of charge) to maintain healthy lead acid batteries, that's 50 ah on a brand new fully-charged 100 ah battery or just 37.5 ah on a regular 75 ah battery. My 8 cu. ft. DC-only compressor conversion draws 75 watts (5.5 amps) off lithium batteries. That would be about 6.0 amps from new lead acid batteries or 72+ ah over 12 hours, which is well beyond the limit of a new 100 ah battery, never mind the parasitic drain. Plus, you likely have a standard 75 ah battery anyway in your coach. Not even close.

Go lithium or stay home (plugged in) if you are going mostly all electric. Don't even get me started on charge rates. :-)
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Old 01-06-2020, 09:37 AM   #7
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I have had several rvs and tried operating on battery just to see how long they would last. With two batteries, the refrigerators lasted half a day at most. Refridgerators use very little propane and is the only way to go. Even when driving down the road and charging the batteries, the refrigerator never seems to maintain the same cold temperature as propane.
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