[RE-wrenches] Adding battery to grid tie

[Jason Szumlanski]

We are doing this a LOT here right now. It became especially popular after
Hurricanes Ian, Helene, and Milton hit here in quick succession.

If they have Enphase microinverters (very popular here), we typically keep
them in the Enphase ecosystem with 5P batteries.

If they have anything else, we typically recommend Tesla Powerwall 3, and
try to sell some DC-coupled panels added on as well.

We do NOT offer SolarEdge storage products, even if they have existing
SolarEdge optimizers. We refuse to sell or service SolarEdge products, but
we will add AC coupled battery backup to existing systems.

If they want generator redundancy, the Enphase solution is a bit limiting,
so we steer clear of that. For Tesla we will offer a generator interlock if
they are willing to do things manually, or they can integrate a
generator with automatic transfer switch on the load side of the Powerwall
to power loads if batteries are depleted. If they want true redundancy, we
recommend Midnite AIO with Powerflo16 batteries. However, I have only AC
coupled a small PV array to the AIO so far. I'm not sure how to deal with
larger systems, especially with parallel inverter setups. I am on the fence
about EG4 like many others here, but the GridBoss is a compelling option
when generator integration is desired. I believe you can AC couple to it
when using any of their 18k/21k inverters with batteries.


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 Sat, Aug 9, 2025 at 11:26 AM Jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Is there a consensus as to what equipment to use for adding battery backup
> to normal GT inverter?
>
>
>
> I’ve had a few people ask and I actually haven’t done it.
>
> Thx
> Jay
>
>
> _______________________________________________
> 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/20250809/96951a81/attachment.htm>