More Solar for "Us"
Ok, I went off.the deep end? Bought 3 used 37watt uni-solar panels and a blue sky 2000e controller for the hefty price of $400, They were being listed as 75w panels, they are not The tested open...
Forum Discussion
MrWizard wrote:
The xantrex C-30 dollar controller did not respond the way you are thinking
Once it dropped to float it stayed at float voltage output until battery voltage dropped then it would increase voltage
It does not increase amps to maintain float voltage
Afaik this is true of all solar controllers, even the Grape 40
Granted as load is applied and amps increase voltage drops and there will be an increase in solar amps output
But the previous controller xantrex did not change anything
This is simply a function of decreased battery voltage aka resistance allowing more amps flow
It is a set voltage maintained with no load drain, any amps is determine by battery acceptance
With a load it will at some point switch back to boost after a low voltage threshold switch point is reached
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My Rogue MPPT works this way too. Once battery voltage drops to 0.5V below the float set point, it reverts to MPPT (boost) mode.
So when boondocking, not in storage, and actually using the batteries routinely, I increase the float set point to 13.6V from the usual 13.2V used in storage. So the controller goes into mppt once the battery V drops to 13.1V.
