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Old 08-19-2020, 11:41 AM   #1
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2012 Interstate Coach
Sacramento , CA
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Newbie Electrical Question

Hello,

I am brand new the forum and RVs too actually. I am working my way through stuff pretty quickly, but I am trying to understand how the solar battery and house battery work together. I have a 2012 Interstate and I believe the system on the roof is 55W. Does it have its own battery or does the solar system charge the house battery?

Sorry for the super remedial question.

Thanks,

Andy H
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Old 08-19-2020, 12:16 PM   #2
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Austin (Hays County) , Texas
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Quote:
Originally Posted by ahernand1970 View Post
I have a 2012 Interstate and I believe the system on the roof is 55W. Does it have its own battery or does the solar system charge the house battery?

Sorry for the super remedial question.

Thanks,

Andy H
The solar system charges the house battery, even when the disconnect switch is in the off position. The only other battery is the chassis battery in the cab.
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Old 08-23-2020, 06:52 AM   #3
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It charges the house battery - but barely. It will probably keep the battery charged if the only parasitics are the smoke, CO, and LPG alarms - which on some vintages are live even with the master disconnect is in the disconnect position. But 55 W (and the associated Sun charge controller) are not good for much else.

I think, in theory, the chassis battery will charge via the BIM if the solar panel is keeping the chassis battery charged but the house battery is somehow discharged. But in reality the solar panel cannot barely keep the house battery charged and has little 'left over' for the chassis battery.
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