Re: Huge Voltage Drain Problem - Ideas?
The Xantrex reads volts amps amp hours and time to discharge.
A discharge of 50 amps will show as -50. Over 2 hours it will subtract 100 amp hours from amp hours available rather more than the op recorded.
So you already have an ammeter in the unit. There is no need to install another particularly.
The question is was the apparent discharge real or not? The battery voltage suggests not.
The amps are measured via the voltage drop between the two sides of the shunt across a small fixed resistance. I believe they are the orange and brown wires from memory. The amps are then calculated by the device knowing the resistance i.e. 5 mv = 50 amps. The op may or may not have a voltmeter capable of that accuracy.
The unit would have reset when the new batteries were fitted. Capacity type and temp would be the only things needing to be entered. If the unit was wired incorrectly this would have been evident early on. When the batteries were disconnected if for more than 30 minutes the unit would have reset. That may have been what solved the problem.