[cknuth]

Richard, I don't have a setup option for float voltage, and there may not be any float in the CC/CV mode.    Below is the Volts/Amps trace from the Magnum remote manual.    It appears that once the constant voltage phase times out (2 hours as I have it now,) the Silent mode lets the batteries fend for themselves until direct 12V and inverted 120V loads pull them down to the Recharge level of 13.3V.  Still, that should take longer than the system is spending in Silent mode currently (maybe 15 minutes?)    I agree with your reasoning, but I can't find the setting to change.   

I'm going to camp out by the monitors and watch charger voltage vs. the battery voltage on the Xantrex.    So right now, we're in the usual Constant Voltage 14.3V mode, with the Xantrex reading 14.22V.    Will check in later with more readings.