Even with LFP, mixing different-age batteries is still not the best idea. Even if using closed-loop communication, they can get out of balance pretty quickly, which will lead to all kinds of BMS issues.
One of the reasons I suggest using a main positive and negative bus with breakers: You can easily isolate the parallel strings and charge them independently to ensure they stay balanced. Personally, anything older than six months' difference, I would still plan on balancing every 4-6 months. The harder they work them, the more often they will need to be balanced. <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 Tue, Apr 23, 2024 at 2:05 PM jay via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > HI All > > Speaking of batteries I wonder what you all make of this. > > I was reading the Fortress battery manual and it says they don’t recommend > adding new lithium batteries to older lithium batteries if the age is over > 1 year difference. > > Thoughts? > > thanks > jay > _______________________________________________ > 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
