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Hi my name is Robert....
IF the tank monitor is not reading properly on ALL tanks it sounds like it could be a wiring or failed component such as the sensors or if you have a circuit card for the sensors. I see this is a 2016 unit and any issues should be covered under warranty. It can be difficult on these units to gain access to the sensors and wiring, if they see you have been taking items apart you could void the warranty have seen that happen before so it would be best for the dealer to take a look. Hard to say if the low voltage causes this, sometimes the electronics in the monitor system are sensitive to low voltage. I would have the dealer check this out. IF you want to try another expert on this please let me know, my goal is for you to be satisfied.... Robert