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Old 06-23-2016, 03:19 PM
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Default Losing Power in Dual-Battery Setup

Struggling with an electrical problem in the FWC. I have a dual battery setup with a separator from the truck. The camper has a "plug-in" that allows the truck, when running, to charge my batteries in the camper. My voltage indicator has been showing volts at roughly the 12.2-12.4 range. I intentionally went with a dual-battery setup in the camper to run my ARB fridge for a few days of camping in hot weather.

For some reason, my voltage dropped below 12, kicking the ARB off. I'm going to charge the batteries with a charger to restore full charge to both of them, but I'm curious as to why the batteries aren't charging sufficiently when driving. In speaking to a "battery" guy, he said the charge coming from the truck when being driven is the equivalent of a trickle charge. Even so, I thought I'd have enough charging time from driving to work and such, to keep the batteries fully charged and the fridge running.

Where's the problem with the charging set-up, what should I be looking at in order to camp in one place for a few days and not have to worry about losing all power?

Thanks in advance for your thoughts
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Old 06-23-2016, 03:29 PM
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Sounds like your alternator might be on the fritz, I would expect to see 13.8-14.4 while charging unless the load was tremendous.
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Old 06-23-2016, 04:08 PM
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I bet your alternator cant keep up. Even a work commute is not enough time to get two batteries up to snuff. Think about how long it takes for a battery charger...

It's been HOT out. My fridge is doing the same thing. I have two yellow tops and im going through the same thing. I just dont drive enough to keep them charged when trying to keep the fridge at 29 degrees in a 110+ degree car. A battery charger puts them back where they need to be overnight.
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Old 06-23-2016, 05:27 PM
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What kind of dual battery charge system? My national Luna will not charge battery 2 if volts are too low and too short duration. So, my short work commute doesn't charge battery 2 at all and it goes flat (but long trips with extended periods of driving, performs fine).
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Last edited by MDH33; 06-23-2016 at 07:14 PM.
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