<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr"><br></div><div dir="ltr"><br><blockquote type="cite">On Dec 11, 2024, at 5:52 PM, Jay <jay.peltz@gmail.com> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8"><div dir="ltr"></div><div dir="ltr">I’m going to try and fix a black start 4 x fortress E flex tomorrow with a vevor 15 amp 48v charger the customer bought. $100. </div><div dir="ltr"><br></div><div dir="ltr">I’ll let you know how it goes. </div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br><blockquote type="cite">On Dec 11, 2024, at 12:47 PM, Steve Higgins via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div>William... <br><br>I have found that the best way to do this is to get a regulated power supply... <br><br>You can use a 60V-5A regulated power supply such as this. <br><br><a href="https://www.amazon.com/Adjustable-Switching-Regulated-Adjustments-Jesverty/dp/B0B7739SMN/ref=sr_1_3?crid=23FQP9GRXJN8V&dib=eyJ2IjoiMSJ9.8lw5oh09yqEulTUX5HEVIIDjBTKpHwzMunKsxWbirnjrTcbTeCRMpvBkvecHly3QdpCCneegdeFTlmca1113laVHIMZkY4Y_o01Ju1LnSLeXjKUPqLwojKzLHVlADneIPWCWsvCoWU9M6Fh4YCBs48kp4eECgcZz7yvdMMVVNHeJkxlFjdvtX9yVW3TGV_wq1BAeToAbxIpzVofasQZ96Ct8GRBLW1bVabcCc_RmAhs.4rbtHxDJBEfcDO734UIYkkHpTk6Cr64NgmGhT7Co2B4&dib_tag=se&keywords=60V+Regulated+power+supply&qid=1733945986&sprefix=60v+regulated+power+supply%2Caps%2C173&sr=8-3">https://www.amazon.com/Adjustable-Switching-Regulated-Adjustments-Jesverty/dp/B0B7739SMN/ref=sr_1_3?crid=23FQP9GRXJN8V&dib=eyJ2IjoiMSJ9.8lw5oh09yqEulTUX5HEVIIDjBTKpHwzMunKsxWbirnjrTcbTeCRMpvBkvecHly3QdpCCneegdeFTlmca1113laVHIMZkY4Y_o01Ju1LnSLeXjKUPqLwojKzLHVlADneIPWCWsvCoWU9M6Fh4YCBs48kp4eECgcZz7yvdMMVVNHeJkxlFjdvtX9yVW3TGV_wq1BAeToAbxIpzVofasQZ96Ct8GRBLW1bVabcCc_RmAhs.4rbtHxDJBEfcDO734UIYkkHpTk6Cr64NgmGhT7Co2B4&dib_tag=se&keywords=60V+Regulated+power+supply&qid=1733945986&sprefix=60v+regulated+power+supply%2Caps%2C173&sr=8-3</a><br><br></div><div>I have found that this is a great way to wake up LFP batteries that have gone into protection mode.<br><br></div><div><br></div><div><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div style="float:left;padding:1px 10px 0 0"><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"><img src="https://i.imgur.com/YIluKhq.png" alt="" style="padding:3px 0px 0px 10px;float:left;margin-right:10px;width:98px;height:115px" data-unique-identifier=""></a><div style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:14px;line-height:20px;font-family:Arial,Helvetica,sans-serif;margin:0px"><font color="#bb1a1d">Steve Higgins ⋅
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Any unauthorized review, distribution or other use of or the taking of any action in reliance upon this information is prohibited. If you receive this email in error, please contact the sender and delete or destroy this message and all copies.</span></div><hr></span></span></div><table></table></span></div></div></div></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Dec 11, 2024 at 11:22 AM William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> 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 dir="auto">Bruce:</div><div dir="auto"><br></div><div dir="auto">There has been some correspondence here on boot-strapping low SOC lithium batteries in protect mode. Buying an outboard battery charger seems hard to accept when you are standing next to a sophisticated battery charger. </div><div dir="auto"><br></div><div dir="auto">We had a few occasions of a large E-vault system shutting down for low charge due to mis calibration of SOC. We restarted the system by disconnecting the closed loop data connection, reprogramming the inverters to think they were operating with a VRLA bank and restarting the system. The battery bank, when restarted came on line just long enough to accept battery charging. </div><div dir="auto"><br></div><div dir="auto">Once the SOC came up to acceptable levels we reset the system for a BMS battery and we were back running. </div><div dir="auto"><br></div><div dir="auto">Maybe this procedure might work for someone else. I have a step-by-step for doing this with a Sunny Island system if anyone wants to look it over. <br clear="all"><br clear="all"><div dir="auto"><div dir="ltr" class="gmail_signature"><br>William Miller<br>Miller Solar.com<br>805-438-5600<br><a href="http://www.millersolar.com" target="_blank">www.millersolar.com</a><br></div></div></div><div><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Dec 11, 2024 at 11:08 AM Bruce Erickson via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> 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="overflow-wrap: break-word;">Recently one of our four now-orphaned SunVault systems failed to back up for our customer. On site we found the batteries discharged below cut-in voltage for unknown reasons (no more monitoring, no more tech support). Even though it had been sunny for a few days the system failed to retain a reserve to restart once sun returned. I’m looking for recommendations for 48 volt external chargers for this situation. We’re looking at Iota which only has a 13 amp charger at 48v but does have a plug-in module for controlling LiFePo charging. At 256 amphours of parallel batteries hopefully an 8 or 10 hour charge would get us up to cut-in. I’m also not sure how the Iota will play with any BMS the SunPower batteries might have. Any recommendations for this situation would be much appreciated.<div><br></div><div>Thanks in advance,</div><div>Bruce<br><div><br><div>
<span style="color:rgb(0,0,0);font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline">Bruce Erickson</span><br style="color:rgb(0,0,0);font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><span style="color:rgb(0,0,0);font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;float:none;display:inline">Mendocino Solar Service</span><br 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