Panel to controller fuse sizing
Hi and thanks for the Forum.
I’m getting ready to hook up my first “real” panel of any size, and want to make doubly sure I am sizing the fuses between panel, controller, and controller to batteries correctly. I’ve owned this old inverter since it was new, but have previously only charged it with shore power, or a generator. All the main battery cables are #2AWG and the positive cable between the batteries and Heart is fused correctly. I searched your site for fuse sizing info, and to find out what ISC stands for, (now I know it stands for short circuit current). I plan on using #10AWG blade type automotive fuse holders for these fuses.
Now, I’m adding the panel and controller below to the system. The guide with the panel gives this formula for sizing the fuses for the positive leads from panel to controller, and controller to batteries:
# of panels in parallel (I have only one), X panel ISC (5.75 amps), X 1.2
I came up with 6.9 amps.
Does this sound like I am on the right track? I would rather undersize than oversize, as I live in an extreme fire hazard area, and this system is in a shop a mile from my home.
Heart Freedom 25 Inverter/charger
(one)Renogy 100 Watt 12 Volt Monocrystalline Solar Panel
WindyNation P20L LCD 20A PWM Solar Panel Regulator Charge Controller
Two 6volt golf cart batteries. (Costco)