[RE-wrenches] Adding battery to grid tie
drake.chamberlin at redwoodalliance.org
drake.chamberlin at redwoodalliance.org
Tue Aug 12 07:05:55 PDT 2025
17.1 Connection to the Off-Grid Power System
(Protected Loads Panel)
SI5048U-TUS121440 | TBEN-SI5048U | Version 4.0
I've seen it elsewhere in SI literature also. It seems like a good
descriptive designation that won't interfere with NEC definitions.
_Drake Chamberlin_
_Athens Electric LLC_
_Ohio Electrical Contractor's License 44810_
_NABCEP Certified PV Installation Professional_
---
On 2025-08-11 17:17, Chris Schaefer via RE-wrenches wrote:
> Dave,
>
> Well that's a new term I've never heard before. Please explain the
> Florida Hurricane Tap sir. Is this perhaps for generator use?
>
> Christopher
>
> On Mon, Aug 11, 2025 at 9:41 AM Drake Chamberlin via RE-wrenches
> <re-wrenches at lists.re-wrenches.org> wrote:
>
> I use the Sunny Island designation of "Protected Loads."
>
> ---
>
> On 2025-08-09 13:54, jay via RE-wrenches wrote:
>
> Yeah I've given up trying to correct people on that one.
>
> On Aug 9, 2025, at 11:26 AM, Foxfire Energy via RE-wrenches
> <re-wrenches at lists.re-wrenches.org> wrote:
>
> Umm, just an FYI, I actually got dinged for labeling the AC output
> panel from a battery backup inverter as "Critical Loads".. Critical
> loads (Critical Branch circuits) are defined in article 100 of the NEC
> as circuits associated with Patient Care.. AC loads from battery backup
> inverters are more appropriately defined as "Dedicated Loads"..
> Maybe someone could correct me here, but I'm under the impression most
> garden-variety inverters are not rated for Critical Load applications.
> db
>
> -------------------------
>
> From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf
> of William Miller via RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Sent: Saturday, August 9, 2025 1:03 PM
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Cc: William Miller <william at millersolar.com>
> 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 [1]
>
> On Sat, Aug 9, 2025 at 9:50 AM david quattro via RE-wrenches
> <re-wrenches at lists.re-wrenches.org> wrote:
> True. if you want to do grid, gen, and AC Couple then you need a
> transfer switch or contactor.
> Likewise I haven't touched a Powerwall, nor an Enphase battery.
>
> On Sat, Aug 9, 2025 at 9:36 AM jay via RE-wrenches
> <re-wrenches at lists.re-wrenches.org> wrote:
> One big issue with the AIO's is that you can't do grid, generator and
> ac coupling to the best of my understanding
>
> I do like the idea of just removing the old GT inverter and stuffing
> that into the AIO, elegant
>
> yes its my understanding that Tesla won't accept generator. While many
> are pissed off at eg4, I won't touch tesla.
>
> and FYI you can buy the same inverter at Fortress.
>
> thanks everyone.
>
> jay
>
> On Aug 9, 2025, at 10:28 AM, Tyrone Houck via RE-wrenches
> <re-wrenches at lists.re-wrenches.org> wrote:
>
> Midnite AIO and Sol-Ark both work great for AC coupling in my
> experience. If anyone is new to "All In One" inverters I recommend
> having tech support walk you through commissioning, check firmware,
> etc. the first time.
>
> On Sat, Aug 9, 2025, 8:47 AM William Miller via RE-wrenches
> <re-wrenches at lists.re-wrenches.org> wrote: Two options:
>
> 1. AC couple existing inverter to a battery capable inverter.
>
> 2. Replace existing inverter.
>
> I favor option 2.
>
> Option 1 is only preferred if gaining access to the existing inverter
> for replacement is difficult. An example would be a micro-inverter
> system.
>
> New AIO inverters allow true high voltage PV input so the existing
> stringing will probably not need to be modified.
>
> I'm new to this so type of upgrade so I welcome any corrections to
> these opinions. I did replace a Sunny Boy in my shop with a Soul Ark
> and it's working great!
>
> William Miller
> Miller Solar.com
> 805-438-5600
> www.millersolar.com [1]
>
> On Sat, Aug 9, 2025 at 8:26 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
>
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--
Chris Schaefer's
Tel 585-229-2083 or Cell 585-748-1870
5115 S Hill Road ~ Canandaigua New York 14424
_www.solarandwindfx.com [4] ~ E-mail: chris at solarandwindfx.com_
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willing to work and give to those who would not."
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