[cknuth]

“Recharge” is currently set at 13.3V. 

So I watched the monitors go through a cycle.

Time MagnumV XantrexV
3:35 [system entered Silent mode]
3:38 14.2 14.2
3:39 14.1 14.07
3:41 14.0 13.92
3:42 13.9 13.85
3:45 13.8 13.74
3:46 13.7
3:48 13.6
3:51 13.51
3:53 13.5
3:58 13.4
4:02 13.4 13.36
4:04
At this point, Constant Current started, with the Magnum indicating
4:05 13.8V 93A
4:06 14.5V 130A
Then to Constant Voltage
4:07 14.3V 18A
4:10 14.3V   0A

Other observations: the Magnum current during Silent was always 0A; the Xantrex current varied with house 12V loads.  If I turned on some lights, it went up.  Range was 3 – 15A.

It is apparent to me that the CC/CV setting does not supply any float voltage.  I could set the Recharge voltage lower, but it would just take a little longer before the house 12V loads trigger another two-hour constant voltage period.