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

[Jerry Shafer]

William, Wrenches,
I have done several over the past couple years, the only issue I had, I
needed to build a resister that mimiced the BTSas 75 degrees, because the
SI.s will brop and raise max voltage according to the temp, this must be
changed to prevent this as the battery BMS will or at least should do that
anyway. Now I dont know about your batteries and I would suggest that you
look at the battery cables sizes, I looked at a system that had these so
called hight output batteries with # 8 plug in cables, worked very poorly
just a FYI
Fun times

On Tue, Nov 25, 2025 at 9:42 AM William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Jim:
>
> I haven’t tried lithium batteries with a traditional charge controller
> yet.  All of the equipment you list was designed for lead acid.  The
> narrower voltage range of the lithium may confuse the charge controller.
> Same with the AGS triggering.
>
> I know if you call SMA for tech support they may hang up on you when you
> tell them there are lithium batteries.
>
> It may work right away or you may spend a lot of time making it kind of
> work. I hope you can make the client understand this is an experiment. Tech
> support from the battery manufacturer may not be great being a Chinese
> company.
>
> These days I pair lithium only with inverters designed for them.
>
> Good luck.
>
> William Miller
> Miller Solar.com
> 805-438-5600
> www.millersolar.com
>
>
> On Tue, Nov 25, 2025 at 7:33 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
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