Why do battery needs a float current?
I mean, when it's full, floating and there are no loads? To fight the self-discharge, alright. But it draws a bit more than self-discharge would require. I have 300 AH AGM bank, self-discharge ...
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Please guys, don't get confused. Have a rest from crazy holiday shopping and think. Mena - yes, 0.3AH SHOULD go into the battery to compensate for self-discharge, but I observed 2AH going in, daily.
Observed instantaneous current is 0.3A.
With such a current the battery should get 0.3*7hours =~2AH a day, and it does get 2 AH a day according to controller data log.
Projected daily self-discharge of 300AH AGM bank = 0.3AH.
So my question is why I see daily 2AH in data log instead of expected 0.3AH?
Or, if you prefer, - why do I see 0.3A current instead of expected 0.3AH/7=~0.04A?
My only guess is that battery becomes a space heater while on the float, and therefore is taking more charge than if it were self-discharging quietly on its own, without a power source.
It is probably how it should be, but I hoped to get some scientif-ish reasoning from the audience. In the Rogue manual - written like a brief 101 on charging issues, btw - it recommends Float setpoint 1% of the bank, i.e. 3A for my 300Ah bank. So my 0.3A - after a week of floating - is within the norm.
Observed instantaneous current is 0.3A.
With such a current the battery should get 0.3*7hours =~2AH a day, and it does get 2 AH a day according to controller data log.
Projected daily self-discharge of 300AH AGM bank = 0.3AH.
So my question is why I see daily 2AH in data log instead of expected 0.3AH?
Or, if you prefer, - why do I see 0.3A current instead of expected 0.3AH/7=~0.04A?
My only guess is that battery becomes a space heater while on the float, and therefore is taking more charge than if it were self-discharging quietly on its own, without a power source.
It is probably how it should be, but I hoped to get some scientif-ish reasoning from the audience. In the Rogue manual - written like a brief 101 on charging issues, btw - it recommends Float setpoint 1% of the bank, i.e. 3A for my 300Ah bank. So my 0.3A - after a week of floating - is within the norm.
