Join Date: Jan 2003
Location: Maine Coast
Thanked 250 Times in 193 Posts
Rep Power: 16
I have a Xantrex XBM monitor. It's installed so that the on/off rocker switch can be depressed - when it is the start battery is connected and I can take readings for it.
Effectively it is a dual bank monitor.
It's also recommended by PS.
Are you re-programming the monitor for Ah capacity each time you toggle and re-calibrating it? Clearly your house bank and start bank are not the same size nor at the same state when you flip the toggle?
The XBM would only be able to give you a volt reading unless you physically re-programmed it each time you toggled. Clearly I am missing something, though this would not be the first time.
Victron makes a 602 model that will monitor bank 2 voltage, as does the Link Pro, but neither will do two banks of Ah's, state of charge etc..
-Maine Sail / CS-36T
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