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

Tue Nov 26 09:42:13 EST 2019

Mike,

Thanks for posting the note, but I find the wording to be less than fully
clear. According to this note, the "The transformer-less series of inverters
named Sunny Boy TL-US-12, Sunny Boy TL-US-22 and Sunny Tripower
12/15/20/24000TL-US-10 have a neutral connection that is required at
installation for instrumentation, voltage and phase detection only."

There is no mention of the -41 inverter also using the neutral for reference
only, even though the note is "applicable to the following inverter types"
and that shows the -41

Also, the table has these green x marks but no annotation of what the green
x indicates.

Can you clarify, please?

From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of
Harry Mahon
Sent: Thursday, November 14, 2019 11:02 AM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>; Jeff Clearwater
<jeffc at villagepowerdesign.com>
Subject: Re: [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral?

Lloyd - great find!

I am attaching a updated note that specifically calls out current products
but has less code detail.

Best regards - 

Mike

SMA America
Michael Mahon
Technical Trainer, Solar Academy
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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org
<mailto:re-wrenches-bounces at lists.re-wrenches.org> > On Behalf Of Lloyd
Hoffstatter
Sent: Wednesday, November 13, 2019 10:38 AM
To: Jeff Clearwater <jeffc at villagepowerdesign.com
<mailto:jeffc at villagepowerdesign.com> >; RE-wrenches
<re-wrenches at lists.re-wrenches.org
<mailto:re-wrenches at lists.re-wrenches.org> >
Subject: Re: [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral?

Jeff,

An oldie but attached tech note explains.

May Need to upsize G / N  for voltage drop depending on run.

Best regards,

Lloyd

Lloyd Hoffstatter

Sunstruck Consulting

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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org
<mailto:re-wrenches-bounces at lists.re-wrenches.org> > on behalf of Jeff
Clearwater <jeffc at villagepowerdesign.com
<mailto:jeffc at villagepowerdesign.com> >
Sent: Wednesday, November 13, 2019 12:00:37 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org
<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 is any
current on the neutral of a single phase 240 VAC SB 7.7-40 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 SB7.7s.
At 200 Amps I could use 6 AWG according to 705.95.  A huge savings in wire
pull hassle not to mention copper.

Are there any other practical considerations for those SBs to operate well
if I were to go that low with the neutral?

Anybody have any field experience with AJHs on this?

Thanks,

Jeff

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Jeff Clearwater
Village Power Design
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