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diy solar

diy solar

Combiner/Breaker for Panels for eG4 6000xp

hogback

New Member
Joined
Sep 7, 2023
Messages
230
Location
Santa Cruz Mountains
Hi All,

Helping a friend install panels to run into an eg4 6000. We have 16 420W commercial modules, and will do 4 strings of 4. 2 strings will combine on the roof, and each 8 module group will go into their own mppt on the eg4. The specs of the panels are as follows:

vmp 72.9
imp 5.77
voc 85.6
isc 6.2

The first thing I need is a set of breakers/disconnects and a box at the eg4 unit that is rated for over 342V and 15A. I've only ever used 150V midnite stuff before. Any suggestions? I know I don't need current interrupting capability rigorously, but the eg4 calls out for it. I think I've seen some breaker configurations that stack lower V breakers to bring the V rating up - does that make any sense?

Also, my friend is interested in being able to disconnect the 4-module strings on the roof from each other. I myself wouldn't bother. What might I say to convince him otherwise? I any case, I do need some sort of box on the roof to connect emt so I can bring the home runs down off the roof. I was also planning on ditching the mc4s and crimping/sealing to pv wire.

All help/suggestions much appreciates!
 
Do you think that there is any eg4-specific reason they want breakers on the mppt inputs? I have them on my schneider 60-150s, but that's because I didn't understand the components when I built it. I'm thinking a 4-string IMO isolator right at the inverter/mppts would be good if I ran all four strings off the roof and only combined each pair after the IMOs. If one really wanted to mess around with isolating an individual string, you could break the IMO, disconnect some wires from the terminals, and close the IMO again.
 

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