Fusing 3 parallel *2

[kelsol]

I asked this in the SWCC forum, where it might be O/T

6 Weize 100W monocrystalline panels configured as 3 parallel x 2 as SCC divides the lines at the input posts so as to use multiple wires instead of increasing post size.

Maximum Power Output: 100W
Maximum Power Voltage (Vmp): 18.78V
Maximum Power Current (Imp): 5.32A
Maximum System Voltage: 1000V DC
Open-Circuit Voltage (Voc): 22.64V

I would assume 20-30A inlines if using after the 3-1 connectors
The specs do not give a max a max input short current - which appears to be 7A on these type units.
So I would assume 7.5-10A if placed one each leg of the three leads going to each 3->1

My main fuse questions are:

1. Before Y or after Y, and recommended sizes.
2. Some systems fuse both Pos and Neg leads. Is this necessary. I would like to keep all fusing to the Pos leads. This is not a grid system, so ground loops may not be a concern.
3. The two Positive leads will go through a dual 50A switch/breaker.



















Short-Circuit Current (Isc): 5.7A
I am looking at 3p *2 for going to the SCC.
Question is where to source the proper fusing?
3 10A per positive line, or could I get by with 1 30A per line?

 

[sunshine_eggo]

A 3P array requires fusing on each string. The panel label usually lists a max fuse value. Use that. If none listed, use 10A.

 

[kelsol]

10A makes sense.

Now the main quest is just positive (one) or both (pos and neg) for each panel.

If both are required - what is the reasoning for a non-grid system?