Hi Scot and Mike,
Yes It is terribly worded - an AHJ could easily read it and come away
with the impression that only the TL and TriPower required the neutral
only for instrumentation and voltage and phase detection - implying the
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.
Mike, can you send back to him for a re-write as this won't hold it's
water to AHJs going forward.
Thanks!
Jeff
[email protected] wrote on 11/26/19 6:42 AM:
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?
simple signature block
*From:* RE-wrenches <[email protected]> *On
Behalf Of *Harry Mahon
*Sent:* Thursday, November 14, 2019 11:02 AM
*To:* RE-wrenches <[email protected]>; Jeff Clearwater
<[email protected]>
*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
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*From:* RE-wrenches <[email protected]
<mailto:[email protected]>> *On Behalf Of
*Lloyd Hoffstatter
*Sent:* Wednesday, November 13, 2019 10:38 AM
*To:* Jeff Clearwater <[email protected]
<mailto:[email protected]>>; RE-wrenches
<[email protected]
<mailto:[email protected]>>
*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 <[email protected]
<mailto:[email protected]>> on behalf of Jeff
Clearwater <[email protected]
<mailto:[email protected]>>
*Sent:* Wednesday, November 13, 2019 12:00:37 PM
*To:* RE-wrenches <[email protected]
<mailto:[email protected]>>
*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
~~~~~~~~~~~
Jeff Clearwater
Village Power Design
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