This is the power supply I used at Sunpower for this, it's $78 on Amazon. No need for the expensive one shown in the Sunpower tech bulletin. The important things are a constant current setting, and manual fine voltage adjustments. For the first 5% it's important to charge low and slow, we were told. Then you can boost them with a larger charger. https://www.amazon.com/Variable-Adjustable-Alligator-Electronic-Tinkering/dp/B07JVS3G9Z ? Dan Fink Owner, Buckville Energy Consulting LLC IREC Certified Instructor for PV and Small Wind Installation NABCEP Certified PV System Inspector NABCEP PV Associate d <dan.f...@greendustrialtraining.com>anbo...@gmail.com 970-672-4342
On Thu, Dec 12, 2024 at 10:54 AM Bruce Erickson via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > 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 > > 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 > <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> 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 >> >> >> On Wed, Dec 11, 2024 at 11:08 AM Bruce Erickson via RE-wrenches < >> 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 >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Change listserver email address & settings: >>> 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/ >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org >>> >>> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> 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/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > 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/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. 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