I'm designing a new system to replace my cobbled together off-grid system.
Basic specs: 5.3kw consumption daily, PV primary supply, generator backup. Probably around 1300w of panels.
I have been considering the Outback FP1-1 system which includes the inverter/charger, PV charge controller, and associated integration hardware. I like the outback's automatic gen start system, but I'm not satisfied with the auxiliary output on its PV charge controller, which has me leaning toward a more custom solution once again.
What I want out of the Charge Controller is the ability to divert excess power when the batteries can't take everything the PV array can supply. I'd like to divert that power to a 12v or 24v solar water pump controller and on to the pump. I'd use this to provide irrigation to a yard during the "dry season" when rain is scarce while sun is plentiful. I'm looking for a controller that will basically split the power, prioritizing battery charging obviously.
Outback's charger has an aux circuit which can be used to switch a relay, but then the load has to be powered from the battery back. From my understanding, this limits operation time to the set relay operation threshold and potentially taking more from the batteries than the array is sending. Outback's 80amp unit costs $600.
Blue Sky has a unit, which will actually send up to 20amps to a diversion load whenever it has current the batteries will not accept. This is great, but Blue Sky's unit is only rated to 30 amps. Cost is $350.
With 1300w of panels, I'll need a unit rated to at least 60 amps.
I supposed I could buy to Blue Sky units and combine the aux outputs....
Any other manufacturers I should look at? Any other thoughts?