Ummmm, no I don't get this at all. Rick are you seeing something I am not?
The MPPT (I am presuming this is a pulse width charge regulater for the solar panels) should not be an issue. It regulates the 20V or what ever and maintains a constant charge voltage/current into the bank. It also acts as an isolator so as the bank cannot discharge back into the panels
at night. But I can't quite understand how you could blow a 30A fuse connected to it. Nor why you would have a 30A fuse anyway. 30A would require 400 odd watts of solar panel to produce. That's a lot of panels
. Have you got that many? Besides, the regulator
limits the current
to what ever the regulator
is designed for. So if it is say a 10A regulator, then it will only supply 10A of charge current
at full charge/Sun. so a 15A fuse would be plenty. If you had a huge amount of panels, then you could have the 30A on the primary side of the regulator to protect the wiring
to the panels.
OK, so if I get this right, you basicaly parrelled a wire from switch to banks. I don't see that as an issue that would create a problem of over charging
. Unless a bank has not come up to a step voltage to allow the charger
to go from say bulk to topup or float stages. This would mean the charger
is poking in full current all the time and the batteries would get too hot. This is an issue that can occur with the distances and cable linking batteries in the variuose groups around the boat.
How big is the boat?? I would suggest if it is not tooo big, you take the winch
bank away at run the cables
to the house bank. Keep the start bank and house bank seperate with no combining switch. Or if you do have a switch, keep it in say the engine
room so as you use it for an emergeny start only.