<div dir="ltr"><div>I have done many systems with the Midnite charge controllers (and outback and victron and others) with lithium batteries. With the right voltage settings they can work quite fine. The Sunny Island inverter I am not sure... it should be possible to set all of the voltage settings to work with them, but I have never tried it with them. I have heard of people doing this though -- one of the first lithium battery systems written up in Home Power was a Sunny Island system with Discover lithium batteries if I recall. Lithium batteries do have a much flatter voltage curve than lead acid, so guessing SOC based on voltage is even more difficult than with lead acid batteries. Some sort of AH counting SOC meter is very helpful if doing an open loop lithium battery without BMS communications.</div><div><br></div><div>What would concern me from the scenario you have presented is that the specs are for a lithium battery cell... not a lithium battery with a BMS. I have built many lithium batteries for my own use out of cells by adding my own BMS, but that's a whole nother level of fabrication compared to just installing a complete battery. And will most certainly not be UL9540 listed. I would not install a non UL9540 listed battery for a customer because of the liability.</div><div><br></div><div>Zeke</div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Nov 25, 2025 at 1:05 PM <<a href="mailto:re-wrenches-request@lists.re-wrenches.org">re-wrenches-request@lists.re-wrenches.org</a>> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Message: 2<br>
Date: Tue, 25 Nov 2025 07:31:40 -0800<br>
From: Jim Gowdy <<a href="mailto:gowdyelectriccambria@gmail.com" target="_blank">gowdyelectriccambria@gmail.com</a>><br>
To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
Subject: [RE-wrenches] New Lithium Batteries on Sunny Island System<br>
Message-ID:<br>
<<a href="mailto:CAC%2BtiP7COiKi7BLMibm1L-Fm8pnBnirnMbFqSFLwJaQPsx70-g@mail.gmail.com" target="_blank">CAC+tiP7COiKi7BLMibm1L-Fm8pnBnirnMbFqSFLwJaQPsx70-g@mail.gmail.com</a>><br>
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<br>
Hello All,<br>
I have a client that just got some lithium batteries and they have a<br>
sunny island inverter with a Midnight Charge controller. I've heard and<br>
experienced integrating Lithium batteries into a Sunny Island inverter is<br>
challenging and could create problems. Has anyone had experience with<br>
these batteries or installing lithium batteries with these components?<br>
Below are some details about the system so far.....<br>
<br>
System:<br>
48v<br>
<br>
NEW BATTERY:<br>
China Aviation Lithium Battery CO.<br>
model: CA180F<br>
nominal voltage: 3.2v<br>
rated capacity: 180Ah<br>
rated energy: 576Wh<br>
<br>
Inverter:<br>
Sunny Island<br>
model: SI 4548-US-10<br>
<br>
CHARGE CONTROLLER:<br>
Midnight Solar Classic 150<br>
<br>
SOLAR ARRAY:<br>
N/A....it was dark when I was at the site so I couldn't take any notes<br>
<br>
<br>
<br>
-- <br>
Jim with Gowdy Electric<br>
Cambria, Ca 93428<br>
business 805 927 2630<br>
cell 805 975 5279</blockquote></div></div>