Xantrex inverterg/charger shows full charge at 12.2V

Question

I have a Xantrex RV3102GS inverter / charger (with Xantrex RC/GS remote control panel) and it's working fine except that charging doesn't work great. At around 12.2V it's showing 'batteries full' and will only charge in 'float mode' and at around 11.5V is only charging in 'absorbtion mode'.

I'm hoping there's something I can adjust to tell it that 13V is 'batteries full' so that it goes into 'bulk', 'absorption' and 'float' modes properly. Max charge rate on the panel is set to 100%.

Thanks for any help.

popsie · Answer

Had a similar problem with a different unit -- problem was that where the ground cable was connected to the chassis - nut was loose.

Every thing was fine with the voltmeter, but couldn't handle enough current.

mrwizard · Answer

start with the battry cables both positive and negative

corrosion on the cables will increase resistance, this causes reduced charge current and a voltage drop at the corrosion

the charger can be putting out 13+ volts but the batteries will not 'see it' and get a reduced voltage

michelb · Answer

Thanks for all the suggestions.   As usual, turns out that the simplest solution worked - I looked in the manual on how to adjust the voltage where it goes to bulk, absorbtion, float and didn't find anything but the next chapter mentioned that the battery temperature automatically adjusted voltage so I decided to try that and disconnected the battery temp sensor and sure enough, that fixed my problem.  Batteries weren't charged or used much so I'm guessing my sensor failed.

mena661 · Answer

Glad you found the problem! And thanks for posting the fix.

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Xantrex inverterg/charger shows full charge at 12.2V

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