[RE-wrenches] N-G bond for supply side connection Midnite Power

[Tom McCalmont]

I consulted our Code expert on this question, and this is his explanation:

In 2020 NEC and previous code cycles, the N-G bond requirement in the Solar OCPD for supply side taps was a grey area.  In the 2023 NEC, it is clear the Solar OCPD for supply side taps requires the N-G bond.  This mimics the requirement where a building has multiple service OCPD enclosures.
 
If the N-G bond, supply side tap conductors (phase and neutral, no EGC), and GEC are all sized and installed correctly (as if it is a separate service), there should not be any issues.

I’m not familiar with Midnite inverters, but “CA-DC link Overvoltage error“ sounds like a DC issue, so I don’t see how the AC voltage would matter.  If this error is related to AC voltage, maybe the real issue is a faulty neutral connection between the service and utility transformer?
 

Tom McCalmont, P.E.
CEO, Paired Power
pairedpower.com <http://pairedpower.com/> | LinkedIn <https://www.linkedin.com/company/paired-power/>
Direct: (669) 877-2931



> On Oct 23, 2025, at 8:01 AM, Tyrone Houck via RE-wrenches <re-wrenches at lists.re-wrenches.org> 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 <re-wrenches at lists.re-wrenches.org <mailto:re-wrenches at lists.re-wrenches.org>> 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
>> 
>> --
>> 
>>  <https://www.sungineersolar.com/>	
>> Dave Tedeyan, P.E.
>> Owner | Sungineer Solar
>> p: he | him | his
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