Glad you did read it :-)
I was just about to post a short note re: smart chargers.
A modern smart charger, faced with a fully charged battery and in the float mode, can deliver a LOT of amperage without dropping back to the absorption or bulk charging modes.
In other words, it is fully capable of powering most/all onboard loads without affecting the voltage being maintained at the house batteries.
1. My Iota
DLS-45/IQ4 remains in the float mode (13.6V) even when powering my SSB
radios and my SG-500 amplifier. The amplifier draws 50A or more during voice peaks in the SSB
mode, and the transceiver draws another 30A during peaks. That's 80A or more during voice peaks....the Iota
takes that in stride and remains in the float mode.
2. My Victron Multi-Plus charger/inverter easily maintains my onboard refrigeration
(which draws 6A and runs much of the time because of its advanced age -- 23 years -- and a large poorly insulated box). In addition, it runs other onboard loads...computer, SSB and VHF
radios, nav instruments, TV, etc. all the while remaining in the FLOAT mode.
It's the battery voltage
which controls what the smart charger will do, in most instances. Some of the 'smarter' chargers will also take account of battery temperature and length of time at various delivered current.
I almost never disagree with Richard Kollman who is the acknowleged refrigeration expert, but I must take issue with his remark about compressors which run a lot throwing off the charger's calculus. NO, sorry, if this is happening then you've got a lousy charger.
Especially since, as earlier noted, the compressor in question draws only 3A when running.
I note also that we are 45 posts into this vexing but resolvable issue.
PLEASE, Sailorman, get some instruments and MEASURE WHAT'S GOING ON.
Put us out of our misery :-)