[RE-wrenches] Will IQ8 microinverters backfeed a generator during grid interruptions

[Mac Lewis]

The Generac SMM can be set up to lock out any time the generator is
running.  Its a relatively easy device to install and should work fine.

On Thu, Jan 22, 2026 at 7:24 AM scot.arey--- via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Generac.
>
> I thought that load shed function was based on frequency downward
> deviation caused by heavy loads so perhaps this might cut solar at the only
> theoretically possible point where solar might be acceptable: high loads.
>
> I'm at the point thinking what I tell folks all the time: don't
> interconnect solar downstream of the generator ATS. Sigh...was trying to
> minimize costs to customer in this post-tax credit world but these pesky
> generators.
>
> *Howard "Scot" Arey*
> *Owner, Solar CenTex*
> 254-300-1228
>
> ------------------------------
> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf
> of Mac Lewis via RE-wrenches <re-wrenches at lists.re-wrenches.org>
> *Sent:* Thursday, January 22, 2026 7:35 AM
> *To:* offgridsolar at sti.net <offgridsolar at sti.net>; RE-wrenches <
> re-wrenches at lists.re-wrenches.org>
> *Cc:* Mac Lewis <maclewis1 at gmail.com>
> *Subject:* Re: [RE-wrenches] Will IQ8 microinverters backfeed a generator
> during grid interruptions
>
> Hello Scot,
>
> What type of generator?
>
> Generac has a load shed module that can shed a load remotely by "knowing"
> when the generator is providing voltage.  Small dip switches can be set to
> completely lock out the load when running on generator voltage.  Generac
> Smart management module is the product name.  There are also another
> product from PSP called the  SAK-60 that supposedly can do this with any
> generator type (no direct experience with this).
>
>
>
>
>
> On Wed, Jan 21, 2026 at 3:01 PM Dave Angelini Offgrid Solar via
> RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
>
> And in this case, with all the Ice storm doom and gloom coming, to alot of
> the country, inform your users how to turn off their array and run a
> generator safely!
>
> Offgrid is just so much easier sometimes.
>
>  😉
>
> *Dave Angelini Offgrid Solar
> "we go where powerlines don't"
>    <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ <https://offgridsolar1.com/>  <http://members.sti.net/offgridsolar/>
> e-mail  offgridsolar at sti.net <offgridsolar at sti.net>
> text 209 813 0060*
>
>
> On 2026-01-21 12:55 pm, Zeke Yewdall via RE-wrenches wrote:
>
> In that case, we're getting way off track and way more complicated :P
>
> Just put a contactor between the PV array and the POI using the NC
> contacts, with the coil powered off the generator.  Then the PV array can
> never backfeed the generator because it'll be turned off anytime the
> generator is running.
>
> Zeke
>
> ------------------
>
>
> Thanks but I'm just trying to grid-tie a small Enphase array without ESS
> where the point of interconnection is on the customer side of the
> generator/ATS.
>
> Trying to use existing wires in place to simplify and lower costs...but
> the generator is my constraint because I need the PoI to be on line side of
> the ATS.
>
> Howard "Scot" Arey
> Owner, Solar CenTex
> 254-300-1228
>
>
>
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> --
>
>
>
> Mac Lewis
>
> * "Yo solo sé que no sé nada." -Sócrates *
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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