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diy solar

Adding Parallel String... Fuse?

ddanley

New Member
Joined
Sep 10, 2021
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34
I was getting ready to install a second string to my Solar array and I recalled reading that I needed to fuse between the strings.

The panels will be 3 in series with two parallel strings. The Vmpp for the panels are 33.12 and Impp is 9.36. If I do need fuses, what size? 30A?

I also read putting fuses on the positive and negative sides. True?

I appreciate any and all feedback.
 
Please review this. If it does not answer all of your questions, please bring them up here.

 
I also read putting fuses on the positive and negative sides. True?
If properly installed, there does not need to be fuses or breakers between the PV array and the Controller. However, there are requirements for a disconnect on both the positive and negative lines from the array. Some people find using a dual pole breaker a cost-effective and simple way of implementing the disconnect. In this case, the breaker trip point should be equal to or greater than 1.56xIsc of the array.
 
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