Power supply costs have decreased considerably. Twenty-plus years ago, they were about ten times the current cost. Now, you can get a 60v 5amp supply for less than 90 dollars. For a bit more current, I like to use two 30-volt ten-amp supplies (in Series).
When LFP batteries shut down due to low battery protection, they often output less than 10 volts. A standard battery charger often needs a minimum battery voltage to power up. A few, like the Victron IP series battery chargers, have a power supply mode, but most inverters/chargers need a minimum voltage to wake up. Having a DC power supply is often needed to jump-start these lithium-based batteries. Plug the power supply into the generator, set the power supply to the nominal voltage, and usually, a few minutes to a few hours on the regulated power supply will wake up the BMS. If the customer has discharged the battery very low, or it's been in the protection mode for a long time, it could take days to wake up; in these cases, you need to be very careful as cell damage could have occurred, and you should also monitor battery temperature when attempting to recover. <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+1.902.597.4020m+1.206.790.5840 f +1.902.597.8447 est...@surrette.com <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 Thu, Dec 12, 2024 at 9:54 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. 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 > >
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