[RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral?

Tue Nov 26 16:12:45 EST 2019

Hi Scot and Mike,

Yes It is terribly worded - an AHJ could easily read it and come away=20
with the impression that only the TL and TriPower required the neutral=20
only for instrumentation and voltage and phase detection - implying the=20
rest used the neutral for current.

And your right what do the x's even mean?

I see the SMA author to be Chris Schwegler authored on July 19th, 2019.=20
Mike, can you send back to him for a re-write as this won't hold it's=20
water to AHJs going forward.

Thanks!

Jeff

scot.arey at solarcentex.com wrote on 11/26/19 6:42 AM:

> Mike,
>
> Thanks for posting the note, but I find the wording to be less than=20
> fully clear. According to this note, the =E2=80=9CThe transformer-less se=
ries=20
> of inverters named Sunny Boy TL-US-12, Sunny Boy TL-US-22 and Sunny=20
> Tripower 12/15/20/24000TL-US-10 have a neutral connection that is=20
> required at installation for instrumentation, voltage and phase=20
> detection only.=E2=80=9D
>
> There is no mention of the -41 inverter also using the neutral for=20
> reference only, even though the note is =E2=80=9Capplicable to the follow=
ing=20
> inverter types=E2=80=9D and that shows the -41
>
> Also, the table has these green x marks but no annotation of what the=20
> green x indicates.
>
> Can you clarify, please?
>
> simple signature block
>
> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> *On=20
> Behalf Of *Harry Mahon
> *Sent:* Thursday, November 14, 2019 11:02 AM
> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>; Jeff Clearwater=20
> <jeffc at villagepowerdesign.com>
> *Subject:* Re: [RE-wrenches] 705.95(B) and Sunny Boys - current on=20
> Neutral?
>
> Lloyd =E2=80=93 great find!
>
> I am attaching a updated note that specifically calls out current=20
> products but has less code detail.
>
> Best regards =E2=80=93
>
> Mike
>
> SMA America
> Michael Mahon
> Technical Trainer, Solar Academy
> 6020 West Oaks Boulevard, Suite 300
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> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org=20
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>> *On Behalf Of=20
> *Lloyd Hoffstatter
> *Sent:* Wednesday, November 13, 2019 10:38 AM
> *To:* Jeff Clearwater <jeffc at villagepowerdesign.com=20
> <mailto:jeffc at villagepowerdesign.com>>; RE-wrenches=20
> <re-wrenches at lists.re-wrenches.org=20
> <mailto:re-wrenches at lists.re-wrenches.org>>
> *Subject:* Re: [RE-wrenches] 705.95(B) and Sunny Boys - current on=20
> Neutral?
>
> Jeff,
>
> An oldie but attached tech note explains.
>
> May Need to upsize G / N =C2=A0for voltage drop depending on run=E2=80=A6
>
> Best regards,
>
> Lloyd
>
> Lloyd Hoffstatter
>
> Sunstruck Consulting
>
> Sent from Mail=20
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> for Windows 10
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> ------------------------------------------------------------------------
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> *From:*RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org=20
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>> on behalf of Jeff=20
> Clearwater <jeffc at villagepowerdesign.com=20
> <mailto:jeffc at villagepowerdesign.com>>
> *Sent:* Wednesday, November 13, 2019 12:00:37 PM
> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org=20
> <mailto:re-wrenches at lists.re-wrenches.org>>
> *Subject:* [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral?
>
> Hey Folks,
>
> So does anyone have a reference I can show my AJH as to whether there=20
> is any current on the neutral of a single phase 240 VAC SB 7.7-40=20
> inverter?
>
> 705.95(B) states:
>
> *Neutral Conductor for Instrumentation, Voltage
> Detection or Phase Detection. *A conductor used solely for
> instrumentation, voltage detection, or phase detection and
> connected to a single-phase or 3-phase utility-interactive
> inverter, shall be permitted to be sized at less than the
> ampacity of the other current-carrying conductors and shall
> be sized equal to or larger than the equipment grounding
> conductor.
>
> Be great not have to run 3/0 wire to my dedicated PV subpanel with 5=20
> SB7.7s.=C2=A0 At 200 Amps I could use 6 AWG according to 705.95.=C2=A0 A =
huge=20
> savings in wire pull hassle not to mention copper.
>
> Are there any other practical considerations for those SBs to operate=20
> well if I were to go that low with the neutral?
>
> Anybody have any field experience with AJHs on this?
>
> Thanks,
>
> Jeff
>
> ~~~~~~~~~~~
>
> Jeff Clearwater
> Village Power Design
> linkedin=20
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> cell - 413-559-9763
> ~~~~~~~~~~~~~~~~~~~~~~~
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