Lighthouse Beacon
Following the Light
Yes. I need two because I’mWhy 40 amps instead of the 25 amps mentioned in the manual? Wouldn't that impact safety as the breaker will not trip when 25 amps are exceeded?
Why 2 of those? wouldn't just one do the job?
How many solar panels does your system have?
Did you use the 10 AWG wire to connect the PV to the 40 amps breaker?
Thanks for your patience with my questions.
prob good advice,It’s just a disconnect (well the other commenter bought it for the surge protector and I think prefers breakers to disconnect switches). Sounds like you aren’t familiar with the fusing rules for PV DC. If your strings are 2P or less and you size wires to be greater than 1.56* Isc, then you do not need fuses. Note that if you fuse below this there is a real possibility that solar boosting weather conditions will cause the fuse to blow.
So in this case having big OCPD rating doesn’t matter because you don’t need fuses anyway.
You need two pole because this is a transformer less, non grounded solar configuration. This is the most common config today. And ungrounded refers to the current carrying conductors, the solar panel frames are still grounded.
Note even with the best equipment the wiring guide isn’t guaranteed to tell you all the connections to make and switchgear you have to buy. Nor would hiring out for a wiring diagram specific to your setup.
I think you need to go back to first principles and read some general threads about PV sizing and how volts/current works for PV. Trying to figure that out piecemeal from a product thread is kind of backwards and also means only people interested in the product will see your questions.
Whether you connect PV directly or transition to THHN etc depends on implementation details. I think usually people transition from PV to THHN at either combiner box, junction box, or isolator disconnect at array. So pretty early on. PV is hard to pull, costs a little more, and needs bigger conduit.
You’ve got two solar inputs so you’ve got two parallel inputs, each need a way to be disconnected from your inverter.
Keep reading and stay in spec with manual you’ll be fine. You’ll learn alot too, I am still new to this too but it’s been a lot of fun ao far
