Magnum Inverter DC voltage issues

[kampto]

Hello, My Magnum inverter MS4024 is reading around +3VDC higher then the battery's actual voltage. Its causing me a lot of problems because the low voltage cut off and on is way off from reality. This thing has been in service for 15years. Any ideas on how to fix this? Is there a calibration trim pot inside?

 

[yodamota]

Do you mean the remote is reading 3VDC higher? or at the terminals?

 

[kampto]

Yes, the remote (MERC) is reading high, its been drifting higher over the past 6months. The inverter DC voltage is wrong so its turning on and off at the wrong voltages. So my LiFePO4 batterys hit the BMS shut off before the inverter does the low voltage cut off. And its to old so there is no way to change the voltage cut back on from 25V.

 

[yodamota]

Have you tried a different cable from inverter to the remote?
sorry I don't know how to modify the remote's voltage reading.

 

[kampto]

Changing didn't help, the remote is just reading the inverter.