The supply side switch needs the Neutral-GEC bond. There should also be
one in the Main Service Panel. Although just looking at 250.142 (A) it
says "shall be permitted". So, that is a little confusing to me. I
always have had that bond for this type of connection. Chris
On 10/23/2025 9:07 AM, Dave Tedeyan via RE-wrenches wrote:
Hi All,
For years I have understood that when doing a supply side connection,
you are supposed to bond the neutral to ground in the solar service
disconnect. I have a Midnite AIO system with two inverters (set up as
a supply side connection) that recently was getting a CA-DC link
Overvoltage error. When talking to Midnite, their first response was
to make sure that there was only one N-G bond in the whole system.
When I mentioned that the solar is a separate service and thus there
is a N-G bond in both the main panel and the inverter distribution
panel, they said to remove it from the inverter distribution panel. I
want to make the system work right, but I also am hesitant to do
something against how I have understood the NEC to be for a long time.
I am curious if you all have thoughts on this or run into a similar
situation.
Cheers,
Dave
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