PV to THNN/ THWN connection

[nwdiver]

Thank you for the input. I agree that having multiple points of shutoff is pointless. With the inverter based shutoff, and Tigo RSS, you can shut it down at the panel end, or the inverter end; having a disconnect mid way serves what purpose?
I have forwarded a bunch of info to my inspector and am waiting for a response. PITA, as he's the kind of guy that doesn't like to be told what to do, so I have to carefully choose my words. I know if I tell him the disconnect doesn't need to be there he'll want me to install three of them, just to be a dick.
SD

??? You have RSS AND he wants an additional DC disco ? Jeeze that's idiotic. Does he know about the RSS?

[badwithusernames]

Well, after a tense few emails we had a discussion that ended favorably for me. In the end he agreed that the manual DC disconnect at the barn would serve no real purpose, and I get to have a junction box after all.
Thanks again
SD

[Ddwarf]

Interesting, I just went through this exact process myself. Ground mount with Rapid shut down. I contacted a solar installer to do the final hookup and they wanted to add dc disconnects at the array(would need 3 disconnects for 3 strings). When I questioned the need, they insisted that "it's just how it's done". I ended up wiring it myself with a simple junction box per the three line. I used wire nuts.

Inspector said it was fine. With RSS the need for one DC disconnect is questionable, why would I want another set??

[PVAndy]

Interesting, I just went through this exact process myself. Ground mount with Rapid shut down. I contacted a solar installer to do the final hookup and they wanted to add dc disconnects at the array(would need 3 disconnects for 3 strings). When I questioned the need, they insisted that "it's just how it's done". I ended up wiring it myself with a simple junction box per the three line. I used wire nuts.

Inspector said it was fine. With RSS the need for one DC disconnect is questionable, why would I want another set??

Remind the inspector that an MC4 connector is rated as a non load break DC Disconnect

Andy

[Mike90250]

............... I ended up wiring it myself with a simple junction box per the three line. I used wire nuts..........

Please consider replacing them with split bolts. Wire nuts will be seeing a hours long continuous load and can often overheat in a solar application,

[Ddwarf]

What about using an MC4 connection - would they work better? Can they be used in a junction box?

[Mike90250]

MC4 connectors work well when installed properly. Of course, the problem is, installing them properly without expensive crimp tools

[bob-n]

I don't know about MC4 crimp tools, but there are some respectable Chinese crimp tools on the market now in the $20 price range.