Please help me with my question. I have a 330w solar panel and how do i know the correct fuse size to put between the solar and the charge controller. Also fuse size between the charge controller and my 24v battery bank.

I have attached my solar data plate.

thank youenter image description here

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    \$\begingroup\$ Column of text on the right side, 3rd line: "Series Fuse Rating 20A" ..... \$\endgroup\$ – brhans Feb 5 at 17:36
  • \$\begingroup\$ What are you trying to protect by adding the fuse? \$\endgroup\$ – Andy aka Feb 5 at 17:37
  • \$\begingroup\$ The most important thing which quite a few people don't realize is to fuse the wire between the charge controller and the battery. You may also need a different sized fuse between the battery and the load (or maybe the load can be connected to the charge controller). Solar panels don't always need a fuse since they are intrinsically current limited. \$\endgroup\$ – mkeith Feb 5 at 18:35
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    \$\begingroup\$ Fuses are based on wire size. Wire size is based on current carrying and voltage drop requirement. So pick a wire size that will carry the maximum charge current of your charge controller without heating or excessive voltage drop, then pick a fuse which will protect that wire from in the case of over-current faults. \$\endgroup\$ – mkeith Feb 5 at 18:38

It will make little difference, so long as you pick a fuse that's high enough rating - 10A or more. Or if you put in no fuse at all.

The panel has a maximum current of 9.08A in normal use, and 9.31A if short-circuited. You won't find any fuse that will discriminate between the two.


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