Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 20,059
You are correct. I need 15a breakers. I can swap out the fuses for 15a for now. I am adding a combiner box once I get my new battery built. At that point all my breakers will be the correct 15a per string.
I see an issue with polarized breakers. Unless you can get non-polarized breakers, I suggest touch-safe fuse holders. After combining the strings, you can use a single breaker as a disconnect.
If once you install multiple inverters, no more than 2 PV strings go to any one MPPT input, fuses/breakers aren't required. Then even if you use polarized breakers as disconnect they (usually) won't have the issue that I'm aware of (or at least suspect). You can get some 4-gang polarized breakers from Schneider, rated for 250V when 2 poles are used. If you connect two strings through one ganged 4-pole breaker, that takes care of the concern I have with polarized breakers (so long as only 2 PV strings, no other on that MPPT input.)