Getting back a bit closer to the thread topic perhaps, I had an interesting experience with my near-new 510ah bank of
Lifelines last week.
I was at the
dock with
batteries topped off and the
Victron BMS reset, and decided to turn the
charger off for much of the week to see what some of my individual appliance & cumulative loads might be. My frig/freezer runs off 110v, and with
gps &
instruments mostly off it was primarily lights,
shower drain, heads,
bilge pump, CO detectors drawing on the batts.
With no lights on but CO detectors running, along with heads,
bilge pumps,
shower drains turned "on" but not running, the typical draw was about 0.46 amps. The cumulative draw over the approx. 4 days, according to the BMS, was a little over 100 amps. So with a newly minted 510ah bank, I should have theoretically used approx. 20% of its capacity.
But the BMS showed no lower than 87% SOC. What's also odd (I thought), was when I turned the
charger back on it stayed in float, delivering no more than 20 or so amps back into the batts at any given time at 13.3v. This was based on the
remote monitor for my Xantrex 50A charger, and not metered from the batts. themselves.
Does this sound about right, or should I suspect something may be wrong with my (8 year-old) batt. charger? And what explains the 87% SOC reading with 100 amps drawn from a near-new, 510ah
battery bank?