<div dir="ltr" gmail_original="1"><div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">This client has been advised that it's not a good idea, and any failures might result in a complete battery replacement. If he goes forward, it will be at his own risk.</div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;"><br></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">They have a full-time homewatch person who is quite capable. He could monitor SOC and also isolate banks for balancing efforts if necessary. We have a nice Midnite 2000A battery combiner there with breakers for each battery, so it would be pretty convenient. </div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;"><br></div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">Self-insured. I don't think any of my off-grid barrier island clients have insurance. The mainland insurance market is messed up in Florida. Forget about the islands.</div><br clear="all"></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Principal Solar Designer | Florida Solar Design Group</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">NABCEP Certified Solar Professional (PVIP)</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Florida State Certified Solar Contractor CVC56956</span></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif">Florida Certified Electrical Contractor EC13013208</font></div></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, Jul 14, 2025 at 11:31 AM Dave Angelini Offgrid Solar via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div style="font-size: 12pt; font-family: Verdana, Geneva, sans-serif;">
<div id="m_1004172262928859444signature">Does the client know that they can't blame you for doing something that has chances of being a bad choice?</div>
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<div>Can the client keep track of two different Soc and be responsible about it?</div>
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<div>I would also look into how a home insurance policy would react to a claim.<br>
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<pre><strong><span style="font-size: small;">Dave Angelini Offgrid Solar
"we go where powerlines don't"
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text 209 813 0060</span></strong></pre>
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<p id="m_1004172262928859444reply-intro">On 2025-07-14 6:45 am, Jason Szumlanski via RE-wrenches wrote:</p>
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<div>They are Lithionics. </div>
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<div dir="ltr"><br>Jason Szumlanski
<div><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Principal Solar Designer | Florida Solar Design Group</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">NABCEP Certified Solar Professional (PVIP)</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Florida State Certified Solar Contractor CVC56956</span></div>
<div><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif;">Florida Certified Electrical Contractor EC13013208</span></div>
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<div dir="ltr">On Mon, Jul 14, 2025, 9:33 AM jay via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer" target="_blank">re-wrenches@lists.re-<wbr>wrenches.org</a>> wrote:</div>
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<div>Hi Jason,
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<div>can you let us know what the old battery is so we can dig up the specs and see if there would be any issues. </div>
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<div>There are a few odd ball like simpliphi which while a 51.2v has a very narrow window for operation compared to most other prismatic cells.</div>
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<div>jay</div>
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<div>On Jul 14, 2025, at 5:07 AM, Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" rel="noreferrer" target="_blank">re-wrenches@lists.re-<wbr>wrenches.org</a>> wrote:</div>
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<div>There are never-ending videos on YouTube showing different brands and capacities of LFP batteries working in parallel. I have never tried it myself, and every instinct says don't do it, but I have a situation where it would be very helpful. </div>
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<div dir="auto">I have a client with an older 60 kWh battery that is discontinued and incompatible with any other battery from the same manufacturer. It has a BMS with a 51.2 volt nominal rating. They need another 20 kWh of capacity. It is too costly to scrap the existing battery and start over, and the existing battery has been tested and confirmed to hold very close to its rated capacity.</div>
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<div dir="auto">What is the real deal on mixing and matching? Is anyone doing this safely and successfully? I wonder what the battery manufacturers say about it. </div>
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<div dir="auto">Jason Szumlanski </div>
<div dir="auto">Florida Solar Design Group </div>
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