[RE-wrenches] New Lithium Batteries on Sunny Island System

[Mac Lewis]

Hi Jim,

The big issue is that the Sunny Island will have no idea what the state of
charge is.  The voltage curve is flat and the battery algorithm will have
large errors most of the time.  Otherwise, it will be OK but starting a
generator is best done by some other device that can trigger on voltage
(Midnite).

Good Luck!



On Tue, Nov 25, 2025 at 9:06 AM jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> HI Jim,
>
> If youre not doing AC coupling and AGS then shouldn’t be a problem.
>
>
>
> > On Nov 25, 2025, at 8:31 AM, Jim Gowdy via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
> >
> > Hello All,
> >      I have a client that just got some lithium batteries and they have
> a sunny island inverter with a Midnight Charge controller.  I've heard and
> experienced integrating Lithium batteries into a Sunny Island inverter is
> challenging and could create problems.  Has anyone had experience with
> these batteries or installing lithium batteries with these components?
> Below are some details about the system so far.....
> >
> > System:
> > 48v
> >
> > NEW BATTERY:
> > China Aviation Lithium Battery CO.
> > model: CA180F
> > nominal voltage: 3.2v
> > rated capacity: 180Ah
> > rated energy: 576Wh
> >
> > Inverter:
> > Sunny Island
> > model: SI 4548-US-10
> >
> > CHARGE CONTROLLER:
> > Midnight Solar Classic 150
> >
> > SOLAR ARRAY:
> > N/A....it was dark when I was at the site so I couldn't take any notes
> >
> >
> >
> > --
> > Jim with Gowdy Electric
> > Cambria, Ca 93428
> > business  805 927 2630
> > cell  805 975 5279
> > _______________________________________________
> > 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
>
>

-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20251125/c9ee0ced/attachment.htm>