A DC power supply was recommended to me by a former SunPower field app engineer, but it’s about $1,600. Maybe justifiable if were are going be in the business of black starting lithium batteries now. Does anyone have good information about whether a regulated power supply is necessary versus just a battery charger?
Bruce Erickson Mendocino Solar Service 707-937-1701 PO Box 1252 Mendocino, CA 95460 "Serving the Solar System" > On Dec 11, 2024, at 7:24 PM, Jay via RE-wrenches > <re-wrenches@lists.re-wrenches.org> wrote: > > > >> On Dec 11, 2024, at 5:52 PM, Jay <jay.pe...@gmail.com> wrote: >> >> >> 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. >> >> I’ll let you know how it goes. >> >> Jay >> >>> On Dec 11, 2024, at 12:47 PM, Steve Higgins via RE-wrenches >>> <re-wrenches@lists.re-wrenches.org> wrote: >>> >>> >>> William... >>> >>> I have found that the best way to do this is to get a regulated power >>> supply... >>> >>> You can use a 60V-5A regulated power supply such as this. >>> >>> 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> >>> >>> I have found that this is a great way to wake up LFP batteries that have >>> gone into protection mode. >>> >>> >>> >>> <http://www.rollsbattery.com/> <http://www.rollsbattery.com/> >>> <http://www.rollsbattery.com/> <http://www.rollsbattery.com/> >>> <http://www.rollsbattery.com/> <http://www.rollsbattery.com/> >>> <http://www.rollsbattery.com/> <http://www.rollsbattery.com/> >>> <http://www.rollsbattery.com/> <http://www.rollsbattery.com/> >>> <http://www.rollsbattery.com/> <http://www.rollsbattery.com/> >>> <http://www.rollsbattery.com/> <http://www.rollsbattery.com/> >>> <http://www.rollsbattery.com/> <http://www.rollsbattery.com/> >>> <http://www.rollsbattery.com/> <http://www.rollsbattery.com/>Steve Higgins >>> ⋅ Technical Services Manager >>> t +1.902.597.4020 m +1.206.790.5840 >>> f +1.902.597.8447 e st...@surrette.com <mailto:st...@surrette.com> >>> <http://www.facebook.com/RollsBattery> >>> <https://www.youtube.com/user/RollsBattery> >>> <https://www.youtube.com/RollsBatteryEngineering> >>> <https://www.youtube.com/RollsBatteryEngineering> >>> <https://www.youtube.com/RollsBatteryEngineering> >>> <https://www.linkedin.com/company/rolls-battery-engineering> >>> <https://www.linkedin.com/company/rolls-battery-engineering> >>> <https://www.linkedin.com/company/rolls-battery-engineering> >>> <http://www.instagram.com/RollsBattery> >>> <http://www.instagram.com/RollsBattery> >>> CONFIDENTIALITY: The information transmitted herein is intended only for >>> the addressee and may contain confidential, proprietary and/or privileged >>> material. 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. >>> >>> >>> On Wed, Dec 11, 2024 at 11:22 AM William Miller via RE-wrenches >>> <re-wrenches@lists.re-wrenches.org >>> <mailto:re-wrenches@lists.re-wrenches.org>> wrote: >>> Bruce: >>> >>> 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. >>> >>> 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. >>> >>> Once the SOC came up to acceptable levels we reset the system for a BMS >>> battery and we were back running. >>> >>> 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. >>> >>> >>> William Miller >>> Miller Solar.com >>> 805-438-5600 >>> www.millersolar.com <http://www.millersolar.com/> >>> >>> >>> On Wed, Dec 11, 2024 at 11:08 AM Bruce Erickson via RE-wrenches >>> <re-wrenches@lists.re-wrenches.org >>> <mailto:re-wrenches@lists.re-wrenches.org>> wrote: >>> 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. >>> >>> Thanks in advance, >>> Bruce >>> >>> Bruce Erickson >>> Mendocino Solar Service >>> 707-937-1701 >>> PO Box 1252 >>> Mendocino, CA 95460 >>> >>> >>> <logo.jpg> >>> >>> "Serving the Solar System" >>> >>> >>> >>> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> <http://re-wrenches.org/> >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> <mailto:RE-wrenches@lists.re-wrenches.org> >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> <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/ >>> <https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/> >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> <http://www.re-wrenches.org/etiquette.htm> >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org <http://www.members.re-wrenches.org/> >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> <http://re-wrenches.org/> >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> <mailto:RE-wrenches@lists.re-wrenches.org> >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org> >>> >>> There are two list archives for searching. 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