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Magnum Energy - Not Charging Batteries

Posted 02-12-2021 at 11:38 PM by HARVY


I have a 2019 Vista LX 35F, with a Magnum Energy MS2000 Inverter/Charger and ME-MR Remote Controller (I have a ME-RC50 on order, but that's not the point of my post).

I have recently been having trouble with dead/low charged coach batteries. After investigating, I think here's the most important symptom: The ME-MR typically reads "FLOAT, 14V (approx), 0A". This would be fine, but my four coach batteries are nowhere near 14V. When I put my meter on any of the batteries, they are actually around 10V. The only way I can push a charge into the coach batteries is if I start the motorhome main engine, and use the alternator to charge them. (BTW, I tried cleaning the coach battery terminals and topping off acid levels with distilled water - didn't help.)

The above situation is happening when I am connected to shore power right now, but also happened recently while off the grid and trying to charge via the generator.

If I interpret the situation correctly, the controller thinks the batteries are fully charged, so it is not signaling the Inverter/Charger to charge the batteries, though they are actually low. Doesn't seem to matter if AC is coming from shore or generator - neither produce a charge to the batteries.

Has anyone else experienced this? Am I interpreting this correctly? Any suggestions on how to correct? Any help would be appreciated.

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