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Old 09-12-2019, 11:25 AM   #1
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replacing house batteries

I am wondering the correct procedure (if there is one) to replace the two house batteries in our RV.
We have been full timers for the last three years in our 2017 Cardinal 3455, it is time to replace the two batteries. These are the original ones installed when we bought the RV. Reason is they no longer will hold a charge for more than about four hours while on the road, even while the TV is charging them.
My real question is, what is the best procedure to replace these?
Does one leave the house power connected? Will this damage the inverter while the batteries are removed?
I am aware that great care must be taken to make sure the positive lead to the batteries from the inverter not be shorted to ground.

Appreciate any input.
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Old 09-12-2019, 11:34 AM   #2
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As I'm kind of a mechanical and electrical idiot, I opt for the side of caution.

I make a lot more sparks when things are still hooked up and powered on than if I just take a moment to turn off electricity and any downstream loads. I'll use the battery disconnect to make sure nothing is drawing from the batteries as I work.

Make sure you mark the battery cables so you know which is which and what went where. I'll typically take pictures, too (my short-term memory is horrendous).

It's a pretty easy switch, all things considered.
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Old 09-12-2019, 11:39 AM   #3
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Someone earlier just wrote to turn off the breaker to the inverter and leave the house (shore) power connected. This step will not allow you to do certain things that work on the battery, however. So it might be ok for a short period.



And I would suggest looking at two 6 volt batteries. I have had great success with these.
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Old 09-12-2019, 11:50 AM   #4
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Disconnect the shorepower or turn the breaker off for the converter. If your inverter has a built in charger for the battery, turn it off. If you have solar, disconnect the solar arrays.
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