I'm looking for a 2 Pole breaker for the following:
Compete newb here. I'm plannning a system with 2-3 100W 12V solar panels, So, 400-600W. I think that I will need 9AWG wire from the panels to the charge controller, and I think that I want to put a 40A DC 2 pole breaker in-between, for times when I want to safely disconnect the system from the solar panel input.
Am I on track here?
what voltage is your battery system going to be ?
Which controller ? That can determine if you put your pv in parallel or series.
If you are putting the pv in parallel then you need to use a combiner box and that will have breakers in it.
Either way you would want to have a breaker before the controller .
Use voltage drop calculator to determine what size wire you need based on voltage and how far they are from controller.
This is the one I like to use
https://www.southwire.com/calculator-vdrop
Larry
12V 230Ah battery; Victron 100|50 Charge Controller. About 15' of 9AWG wire from the panels to the charge controller. I'll probably get a 2000W inverter, but for now this is a very simple system designed just to charge the battery.
If you want to make your wiring a lot easier and neater , get a Midnite Mini DC box with the appropriate sized inverter breaker. The box has a wiring diagram with it ( ignore the stuff in dotted lines if you don't use the gfci part) . It has the places to mount pv input breaker and breaker for output to battery plus mounting location for a shunt if you want to use one of those. It also has some extra places to mount extra breakers to go to DC loads or distribution block if you want.
Larry