[RE-wrenches] Adding battery to grid tie

[William Miller]

I suppose one could add an E-gauge system with CTs in appropriate
locations.


William Miller
Miller Solar.com
805-438-5600
www.millersolar.com


On Thu, Aug 14, 2025 at 9:16 AM Jason Szumlanski via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I like data. Not being able to measure AC coupled PV input is far from my
> ideal in my opinion, but when there is no other practical choice, I guess I
> would do it. In fact, I have done ita couple of times.
>
>
> Jason Szumlanski
> Principal Solar Designer | Florida Solar Design Group
> NABCEP Certified Solar Professional (PVIP)
> Florida State Certified Solar Contractor CVC56956
> Florida Certified Electrical Contractor EC13013208
>
> On Thu, Aug 14, 2025, 10:48 AM Zeke Yewdall via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> While the AC coupled PV system can be added to the AC backed up loads
>> panel, this defeats a lot of the functionality of a dedicated AC coupled PV
>> array input on the AIOs and is not recommended by most of them.   In
>> theory, yes, it works on most inverters to just add it as a negative AC
>> load -- and I've even AC coupled an old Trace SW, and it works fine on
>> that, despite being designed and built before AC coupling was thought of.
>>
>> But, if it's just on the AC loads output, the inverter does not have the
>> ability to drop the AC PV array separately from the load if it needs to for
>> high battery charge regulating, does not have the ability to measure the PV
>> array input on monitoring, and may have other issues.
>>
>> Zeke
>>
>> > *Subject:* Re: [RE-wrenches] Adding battery to grid tie
>> >
>> > Correct me if I'm wrong:  I believe AIOs can accept AC coupled power
>> > through the load 'output' port. That leaves the Grid and Gen inputs free
>> > for their roles as labelled.
>> >
>> > The AC coupled inverters connect via a breaker in the critical loads
>> > panel.
>> >
>> >
>> > William Miller
>> > Miller Solar.com
>> > 805-438-5600
>> > www.millersolar.com
>> >
>>
>> _______________________________________________
>> 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
>>
>> _______________________________________________
> 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20250814/9797ec5e/attachment.htm>