before installing the meter
attempt to charge the batteries to full, you know like 6-8 hours of charging
overnight is good
then install the meter
follow the instructions and set the battery capacity, in your case approx 220 Amp Hrs
now when you use power, the meter will show the amps out, like -6.6
it will also show percent of remaining charge
and amphrs remaining
so 178 ampHrs equals 22 ampHrs use and 90% capacity still remaining
when charging the capacity will count up until it reaches 220
but the batteries are NOT topped off until charging amps is less than 1.2 amps charge current going in
batteries are considered full when charge current is 0.5 amps at 14,4v or above, per 100amphrs of battery bank
if the meter says 220 capacity, but still charging at 10amps then they are NOT full,
for extended boon-docking, you should Do a full top off charge, at least once a week, even if that means running a generator
for weekend use, coming home and shore power can do that