I agree. It is not a separate service. It is a "tap" of the existing service (I use that term loosely here). The additional service disconnect for the supply side interconnection should have L1, L2, and N connected ahead of the premises main disconnect with no EGC. There should be a N-G bonding jumper in the PV service disconnect. Then there should be no N-G bonds downstream of both the premises main disconnect and the PV service disconnect.
Basically, it's the same as two main disconnects running from a meter enclosure. Each of the service disconnects has a N-G bond required. Some AHJs (the crazy ones) require an EGC between the enclosure where the supply side connection is made and the PV service disconnect. This creates a parallel fault path, and should not be allowed, in my humble opinion. Now it sounds like you might be doing a partial home backup. The issue there is that sometimes the loads or enclosures you moved over the backup load panel have inadvertent N-G bonds. Sometimes it's as simple as someone who got creative and used a ground as a neutral in a switch box. I say simple, but that can be hard to track down. When Midnite said to remove it from the inverter distribution panel, they were probably talking about the protected loads panel. I think more information is needed. Jason Szumlanski Principal Solar Designer | Florida Solar Design Group NABCEP Certified Solar Professional (PVIP) Florida State Certified Solar Contractor CVC56956 Florida Certified Electrical Contractor EC13013208 On Thu, Oct 23, 2025 at 11:03 AM Tyrone Houck via RE-wrenches < [email protected]> wrote: > My interpretation, and the way it was explained to me by both Ryan > Mayfield and Kyle Bolger(several years ago at this point, popular opinion > may have changed since). Is that it is not a seperate service. > It is however required to have a ground-neutral bond( though in my > opinion pointless and redundant as there is a bond in the enclosure where > the tap is made). If it gives you any issue, ensure as close to equal > potential to the grounding electrode as possible(and make sure your neutral > is appropriately sized). I personally don't see the point but it is an NEC > requirement > > > > > On Thu, Oct 23, 2025, 6:08 AM Dave Tedeyan via RE-wrenches < > [email protected]> 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 >> >> -- >> >> [image: Logo] <https://www.sungineersolar.com/> >> Dave Tedeyan, P.E. >> Owner | Sungineer Solar >> p: he | him | his >> a: 1653 Slaterville Rd. >> <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g> >> >> <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g>| >> Ithaca, >> NY 14850 >> <https://www.google.com/maps/search/1653+Slaterville+Rd.+%C2%A0+%7C%C2%A0Ithaca,+NY+14850?entry=gmail&source=g> >> w: www.sungineersolar.com <http://www.sungineersolar.com/> >> c: (607) 270-0370 >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
