I would expect to see Absorb charging. This is further confirmation that your house battery voltages are low. Either due to bad batteries, bad cable connections or excessive current draw.
I would duplicate what you just did. Disconnect the shore power and let the inverter run for an hour. Then use the Magnum interface to read the voltage. Also use a voltmeter to read the voltage on the house batteries' terminal.
Its only a guess, but a reading below 12.6 would again confirm lower than expected battery voltage.
At that point, you will need a clamp meter to measure the current flowing through the house battery ground cables. If that number is small, then your batteries are not holding charge and need to be replaced.
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2006 Newmar Essex 4502
2015 Jeep Grand Cherokee
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