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Old 08-27-2020, 04:12 PM   #1
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Battery / Fridge test

My Adventurer is 3-years old now so I am concerned about the batteries and making sure they're providing full power at this age.

So, I brought the RV home from the storage lot yesterday for a simple test. NOTE: it wasn't very well thought out, mostly I was just interested to see how they'd do and if there was any weakness showing after 3-years.

It was 98 degrees inside the coach and the batteries were are at 100% SOC. I turned on the inverter at 1:30pm and turned on a very hot residential fridge. I then kept track of the SOC every hour on the hour and noted how long it took to cool the fridge while I was at it.

It took 4-hours for the freezer to go from near 100 degrees to zero degrees and the fridge to 37 degrees.

I only ran the test until 10:30pm There was no need to push it overnight.

In the 9 hours I ran the test I used 119 amp hours of power total and ended up at 73% SOC. My battery bank is 400 amp hours of AGM. To me that tells me that my 3-year old AGMs are hanging in there at this point.

No doubt the few hours of afternoon sun helped reduce the drain on the batteries, and once the sun went down the fridge was already fully cold and not working near as hard.

1:30 - 100% SOC
2:30 - 97% SOC
3:30 - 95% SOC
4:30 - 95% SOC (fridge reached temp)
5:30 - 91% SOC
6:30 - 88% SOC
7:30 - 84% SOC (Sunset 8pm)
8:30 - 80% SOC
9:30 - 76% SOC
10:30 - 73% SOC

PS. The inside of the RV was in the high 90's during the day and low 90's at night. Which means the fridge was probably running almost constantly.
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Old 08-30-2020, 08:36 PM   #2
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Well,
That's a pretty good accounting of how well the entire system works, batteries, inverter and fridge. I've just changed to a residential fridge and, am in the process of getting ready to order a PSW 1000 watt inverter to power the fridge if and when I'm not on shore power or gen power. But, I wonder, just how my couple year old (could be older, you how it is when time flies) (4) Golf Cart batteries would do in the same test. Our fridge is a brand new Magic Chef 10.1 cu. ft. It's supposedly drawing 1.4A for startup and, 1.3A for running.
Scott
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