Charging GC2 with Rogue MPPT Solar
Charging a pair of USB2000 golf carts with the Rogue MPPT 3048. US battery says the absorb voltage should be 14.7V (for 2 GC2 in series) held for 2-3 hrs, with charge terminated by max time or when...
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Almot wrote:brulaz wrote:
When in storage I set the float voltage to 13.1V as recommended by US Battery. But then the Rogue waits until the battery voltage drops to 0.5V less (or 12.6V) before going into MPPT mode.
I didn't notice this to happen, and I don't think this is supposed to happen with any controller in the way you describe it.
When there is none or very little loads (you said "storage", right?) - then Rogue maintains this Float 13.1 as long as there is any sun in the sky. There is always self-discharge current and some minor loads like LP detector, so in daytime the Rogue is always running, supplying enough current to maintain 13.1V.
Rogue will only let the battery voltage drop below Float 13.1 when there isn't enough sun to maintain 13.1 (or whatever Float you've set).
...
My bad. I didn't word that very well. This is what I meant:
brulaz wrote:
When in storage I set the float voltage to 13.1V as recommended by US Battery. But this doesn't work very well when out camping, as the Rogue waits until the battery voltage drops to 0.5V less (or 12.6V) before going into MPPT mode.
So I boosted float to 13.6V when camping, when there are more loads.
The only time the trailer sees mppt and absorb modes in storage is first thing in the morning as I have not completely isolated the batteries.
But now I've been convinced to boost my float even higher when camping.
EDIT: Folks, I really appreciate all this advice.
