[RE-wrenches] Transformerless inverter conversion

[August Goers]

Here is a link to download the SolarPro May/June 2016 issue reference
below:
https://drive.google.com/file/d/1eiBt5n-ABfNn2ng8IwVl2yMvVHpQlZ_U/view?usp=sharing

-August
On Tue, Apr 23, 2024 at 4:34 PM August Goers <august at luminalt.com> wrote:

> Hi William and All -
>
> The SolarPro Magazine article on page 35 "Updates for NEC 2017 PV Systems"
> by Bill Brooks is excellent and talks about "The replacement of legacy
> grounded inverters with new and improved transformerless inverters" on page
> 41.
>
> This might be helpful for thinking through the implications of upgrading
> old transformer isolated inverter systems with modern transformerless
> non-isolated inverters.
>
> Best,
>
> August
> Luminalt
>
>
> ---------- Forwarded message ---------
> From: August Goers <august at luminalt.com>
> Date: Thu, Sep 16, 2021 at 6:00 PM
> Subject: Re: [RE-wrenches] Transformerless inverter conversion
> To: <william at millersolar.com>
>
>
> Here is the original magazine I downloaded from the Solar Pro Magazine
> archives.
>
> August
>
> On Thu, Sep 16, 2021 at 5:42 PM William Miller <william at millersolar.com>
> wrote:
>
>> August:
>>
>>
>>
>> I can’t seem to view the diagrams.  Do you have access to a version with
>> those available?
>>
>>
>>
>> Thanks,
>>
>>
>>
>> William
>>
>>
>>
>> Miller Solar
>>
>> 17395 Oak Road, Atascadero, CA 93422
>> <https://www.google.com/maps/search/17395+Oak+Road,+Atascadero,+CA+93422?entry=gmail&source=g>
>>
>> 805-438-5600
>>
>> www.millersolar.com
>>
>> CA Lic. 773985
>>
>>
>>
>>
>>
>> *From:* August Goers [mailto:august at luminalt.com]
>> *Sent:* Thursday, September 16, 2021 3:47 PM
>> *To:* William Miller
>> *Subject:* Re: [RE-wrenches] Transformerless inverter conversion
>>
>>
>>
>> You bet!
>>
>> *August Goers*
>>
>> Principal
>>
>> Luminalt Energy Corporation
>>
>> o: 415.792.6666
>>
>> m: 415.559.1525
>>
>> www.luminalt.com
>>
>>
>>
>>
>>
>>
>>
>> On Thu, Sep 16, 2021 at 2:24 PM William Miller <william at millersolar.com>
>> wrote:
>>
>> August:
>>
>>
>>
>> Perfect. Thank you!
>>
>>
>>
>> I hope I formatted this reply to avoid being moderated.
>>
>> William Miller
>>
>> www.millersolar.com
>>
>>
>>
>> On Sep 16, 2021, at 11:58 AM, August Goers <august at luminalt.com> wrote:
>>
>> 
>>
>> Hi William - I think this article by Bill Brooks directly answers both of
>> your questions:
>>
>>
>>
>>
>> https://www.southportland.org/files/8814/8156/0204/NEC_2017_Updates_for_PV_Systems___SolarPro_Magazine.pdf
>>
>>
>>
>> -August
>>
>>
>>
>> On Thu, Sep 16, 2021 at 9:19 AM William Miller <william at millersolar.com>
>> wrote:
>>
>> Friends:
>>
>>
>>
>> Thanks to all of you for your valuable input on the repowering project I
>> am researching.  I am learning a lot in the process and generating more
>> questions as I proceed.  Here is are questions that came up, and if any of
>> you have insight, I would love to hear it:
>>
>>
>>
>> 1.   Array OCPD/disconnecting.  The existing array has fuses in the
>> positive leads only.  If we were to upgrade to transformerless inverters,
>> will we be required to install OCPD in the negative leads as well?  (In
>> researching this I came upon this entry in 2017 NEC 690.9: *Informational
>> Note: Due to improved ground-fault protection required in PV systems by
>> 690.41(B), a single overcurrent protective device in either the positive or
>> negative conductors of a PV system in combination with this ground-fault
>> protection provides adequate overcurrent protection.*)
>>
>> *2.*   In the 2014 NEC when installing Ungrounded PV systems, the
>> following requirement appeared in 690.35:  *Conductors listed and
>> identified as PV wire installed as exposed, single conductors…*  What
>> happened to 690.35, and can I now use USE-2 on transformerless inverter
>> installations?
>>
>>
>>
>> Thanks in advance.
>>
>>
>>
>> William Miller
>>
>>
>>
>> Miller Solar
>>
>> 17395 Oak Road, Atascadero, CA 93422
>> <https://www.google.com/maps/search/17395+Oak+Road,+Atascadero,+CA+93422?entry=gmail&source=g>
>>
>> 805-438-5600
>>
>> www.millersolar.com
>>
>> CA Lic. 773985
>>
>>
>>
>>
>>
>> _______________________________________________
>> List sponsored by Redwood Alliance
>>
>> Pay optional member dues here: http://re-wrenches.org
>>
>> List Address: RE-wrenches at lists.re-wrenches.org
>>
>> 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/re-wrenches@lists.re-wrenches.org/
>> 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
>>
>> --
> August Goers
> Luminalt
> o: 415.792.6666
> m: 415.559.1525
> august at luminalt.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20240424/a3f057db/attachment.htm>