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Need 12V, 50Ah or less. I have been using a MK Battery M22NF Gel for a couple years. I would like to move to something more compact and lighter weight with a form factor that is specific to my application. I would like the battery pack to be flat, like a brownie baking pan, it can be...

What happens if the leads on a single panel short to each other? Is there a fuse built into the junction box? Should an inline fuse be placed on one of the leads? If so, closest to panel or charge controller? I have 50' cables running thru an attic and don't want to burn the house down.