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Old 06-19-2020, 12:36 AM   #1
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Battery: Expected Parasitic Drain

Does anyone know the expected parasitic drain on the house batteries in a pretty basic/standard RV.

I have the basic equipment, nothing fancy. The usual control boards and whatever else is going on. No inverter unless I turn it on.

Reason I ask is I started with 13.04v after a gen run. I let it sit 5m and took a reading. The RV sat for 3.5h and volts dropped to 12.69. Trying to understand where the .35v went.

Thanks.
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Old 06-19-2020, 01:22 AM   #2
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Originally Posted by The_Breeze View Post
Does anyone know the expected parasitic drain on the house batteries in a pretty basic/standard RV.

I have the basic equipment, nothing fancy. The usual control boards and whatever else is going on. No inverter unless I turn it on.

Reason I ask is I started with 13.04v after a gen run. I let it sit 5m and took a reading. The RV sat for 3.5h and volts dropped to 12.69. Trying to understand where the .35v went.

Thanks.


Well Iím no expert but I believe 12.7V is the textbook full charge reading. Immediately after charging there is a little bit of surface charge that needs to dissipate. Sometimes youíll see instructions to turn the lights on for a moment before checking the voltage to do this very thing. In your case it was just the passage time. I think youíre fine. To be sure you can check it again in a day or two and it should still be close to the same.
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Old 06-19-2020, 01:45 AM   #3
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When I had my Outlaw: it would drop to 12.2 volts in just two days.
Once I added disconnects to the grounds on each side of the battery bay: it would last a couple of weeks before dropping to 12.5 volts.
My Wayfarer's batteries charge to 12.8 volts, and no further.
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Old 06-19-2020, 02:18 AM   #4
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Originally Posted by Pete'sMH View Post
Well Iím no expert but I believe 12.7V is the textbook full charge reading. Immediately after charging there is a little bit of surface charge that needs to dissipate. Sometimes youíll see instructions to turn the lights on for a moment before checking the voltage to do this very thing. In your case it was just the passage time. I think youíre fine. To be sure you can check it again in a day or two and it should still be close to the same.
What Pete said. That .35 volts was just a capacitive charge, not a chemical charge.
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Old 06-19-2020, 02:20 AM   #5
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Old 06-19-2020, 06:32 AM   #6
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Thanks.
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