5.75kw solarsystem connected to a 100 amp Panel via combiner panel ?

[Itsme]

Thanx for the answers folks. That makes sense. So basically the code allows it but does not mean AHJ/Utility will.
I would love to upgrade my panel but I got a quote of $1250 for a new 200 amp panel, parts+labor with a new line to the meter vs $180 for just two 20 amp breakers and the necessary wiring.

This a fair chunk of change I would like to avoid.
My average loads are well below 100 amp.

BTW, the $1250 is a good price for a panel upgrade. Also, if you do it for solar install, you can claim 30% credit on that, I am told.

[josh26757]

Alternative?

I tried to read through all the posts and hope that this was not already mentioned, but here in WV you do not have to go through your panel box. The only difference here is they wanted a breaker panel mounted outside to handle the 300AMPs coming into the inverter, but they do not require the inverter to be directly tied to the existing panel.

Here is the link to the wiring options: https://www.firstenergycorp.com/cont...connection.pdf

You will notice close to the bottom there is an option for wiring separate from the main panel.

[inetdog]

I tried to read through all the posts and hope that this was not already mentioned, but here in WV you do not have to go through your panel box. The only difference here is they wanted a breaker panel mounted outside to handle the 300AMPs coming into the inverter, but they do not require the inverter to be directly tied to the existing panel.

Here is the link to the wiring options: https://www.firstenergycorp.com/cont...connection.pdf

You will notice close to the bottom there is an option for wiring separate from the main panel.

It has been mentioned in other threads and it is called a supply side or line side tap. It is allowed by the NEC but some POCOs will not accept it for an interconnect. To a lesser extent some AHJs have objections to it via local regulations.
Too bad they did not include a one-line diagram of it the way they did for the other interconnections, since that would have made it clearer.

[josh26757]

There was a misconception when I first wired mine and they suggested this setup, but it would have resulted in needing another inspection. I have a 200 amp service and it was no problem just adding it to a duel 40 amp breaker in the main panel. If I had a problem with 100 amp service I would try to connect without entering the main service panel, but I only know my state and inspector. Here they really didn't know what they were looking at, so it was no problem getting everything passed. Plus I paid a master electrician to tie it all in. Though it added $800 to the install the sound mind is worth it. I would still be surprised if they would not allow this type of connection, especially if a 100 amp breaker was added.

[logical]

100 amp panel will only take a 20 amp breaker of additional generation.

As was mentioned, if you have a 125 amp panel there would be no problem with a 30 amp of additional generation because you have a 100 amp main breaker.
The twenty percent rule would give you 125/5=25 amps additional available making a total of 125+25=150 amp total maximum. Because it would be a 125 amp panel with only 100 amp coming through the 100 amp main, you could easily accommodate 30 amps.
If as i suspect from your statements, it is a 100 amp panel with a 100 amp breaker, it can only accommodate a 20 amp breaker for generation.
An upgrade to 200 amps if your incoming wire will allow would bring your house to modern standards and allow 40 amp breaker for generation.
$1200 to $1500 is a fair and good price for the change over.
By the way, if your panel is a Zinsco panel, it would be wise to change for safety reasons. Zinsco is no longer manufactured and they are known to not break causing fires.