Recessed AC Combiner for (2) 25 kW Inverters

[jaggedben]

If it’s 600V or less I like Buchanan copper splice caps. Insulating cap is a separate part.

 

[PWDickerson]

We use terminal blocks to transition from PV wire to THHN. In 15 years, I have never had one fail.

 

[PWDickerson]

Good afternoon to all,

Thanks for much for the comments. There are 695 72 W modules placed on 10 sections of mostly 6/12 roof. A large portion of the modules are on an almost east/west line, some on south side, with some having some north component. There will be some sections productive in the morning sun and useless in the evening sun and vice-versa. I'm not well versed in string arrangement, but the different orientations may have played a part in going with (2) 25 kW, rather than (1) 50 kW.

Regardless, the (2) 25 kW inverters are on site and waiting to be connected to the modules and the local grid. That won't change.

I am also not familiar with what a typical AC combiner panel would look like. My assumption was that it would be a surface mounted box. The (2) inverters mounted in the preferred locations would not have adequate air flow if I have to add another surface mounted box. That was the reason for my original question of using a standard recessed 480 service panel in place of whatever was typically used.

1. I think we have agreed a standard recessed panel will suffice. Thanks for that.
2. What does a typical AC combiner panel look like?
3. Or, are standard electrical panels normally used?

As always, I greatly appreciate your input!

Byron

Did you mean to type 72 695W modules?

 

[ggunn]

We use terminal blocks to transition from PV wire to THHN. In 15 years, I have never had one fail.

The inverters in question are rated at 1000VDC and I have been assuming that the OP intends to take advantage of that in stringing the modules. Is there 1000V rated THHN?

 

[ggunn]

Did you mean to type 72 695W modules?

See post 19 where the OP apparently confirmed (695) 72W modules. Sounds like solar shingles to me.

 

[bellington]

See post 19 where the OP apparently confirmed (695) 72W modules. Sounds like solar shingles to me.

Correct, they are solar shingles. Installers are planning to combine PV output from RSDs in a junction box with wire nuts to wires going to inverters. My mind was thinking of some type of DC combiner box with terminal strips, or DIN rail mounted blocks and breakers. Am I expecting too much?