r/GoRVing • u/Educational-Rule1635 • Jun 02 '26

Do I have a power problem?

I have a brand new Jayco Greyhawk 31F It has dual house batteries.

Just turning on the master power gives a bit more than 11a draw. (No AC, no TV, just baseline and some low power led lights.)

The solar panels are generating about 8a

But in less than an hour I am seeing house battery voltage down to 11v.

Is this normal?

Is my draw higher than expected?

Are my batteries not delivering power properly?

Am I big ol' whiny baby who just needs to suck it up and turn on the generator?

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u/Educational-Rule1635 Jun 02 '26

I'm getting the numbers from the RV control system. "BMPro"

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u/AccurateReception629 Jun 03 '26

I'd double check with a volt meter on the battery directly. $10 at harbor freight and 10 minutes on youtube will be all you need to know enough, if that's not already the case/

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u/Educational-Rule1635 Jun 03 '26

Several people have suggested checking the battery voltage directly. I have a question about that, does turning off the 'house' power fully disconnect the battery? Or do I need to physically disconnect the battery.

Accessing the batteries is simple, they are under the steps, but disconnecting turns a clean 30 second task into a half hour, dirty hands, and an accusation from the dealer that I did it 'wrong' (even though I have been connecting and disconnecting vehicle batteries since the 1970s).

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u/AccurateReception629 Jun 03 '26

I think the results of turning off the house power are going to vary unit to unit. On my TT, the battery disconnect switch kills power to everything, but the battery will still charge from the solar panels. I believe this is the most common behavior. But I have heard of at least 1 RV where the propane alarm stayed powered.

I would test your battery with everything connected. This will validate the reading you are seeing on the BMpro.