asked
I have a 751 15 Charge Controller. It has a yellow 20A fuse. I want to buy a backup fuse online but I have noticed they seem to come in different sizes, large medium etc. Which fuse should I order please?
Hi.
You need a standard ATO-Fuse (19,1 × 5,1 × 18,5 mm), you´ll find in many car backup light/fuse-boxes...
@wain, @Christian Lindermann is correct, the replacement fuse is a standard ATO fuse. That being said, the 75/15's fuse will only blow in case of reverse polarity from the battery/PV inputs, so 1: as long as you connect it correctly, you will never need a replacement fuse, and 2: you absolutely need to have a separate fuse for the wiring to your battery. The 75/15's fuse is for self-protection only, it does not provide protection for your wiring. You should have a separate 25 or 30A fuse on the cabling connecting your solar controller to your battery.
