AGM Battery Charging THE PRIME DIRECTIVE
I have gotten several communications about AGM battery maintenance. Using solar voltaic charging. The big error I read is that the subject of total and complete recharging is not mentioned. And tha...
Forum Discussion
pianotuna wrote:
Hi brulaz,
No, I am shunt free.
All I can say is I get to 0.5 amps per 100 amp-hours of capacity.
...
My Rogue will terminate absorb when its current output drops to ? amps. Think I have the value set to 0.8% Ah + parasitic current draw.
Something like that.
But when boondocking and the loads are higher, absorb current never drops that low, so absorb is terminated by timer instead. So after 2 hours at absorb it drops to float, then to mppt and then back to absorb mode for another 2 hours, repeat. Prolly not *that* bad for the batteries but also not what the battery manufacturer recommends. And these are not AGMs.
My daily logs from several years ago show the Rogue at absorb V for as much as 7 hrs a day when boondocking. With my current system it can be 3-5 hrs per day at absorb V when boondocking.
A charger (solar and/or shorepower) that limits the time at absorb V so as not to overcharge the batteries, like that networked Magnum system, would be an improvement. But pretty pricey I expect. If we were to spend the big bucks I'd prolly move to LiFePO4 (with built-in BMS!) instead.:B
