I read on datasheets of some 12v LiFePO4 packs that no more than 4 of them can be connected in series "due to internal circuitry limitations".
Does anybody know why this happens? And why do not all of the 12v-lithium-packs manufacturer write this in the datasheet? Missing this info, how can I figure out if a specific pack can be connected to 3 or more in series?
Which sites do you suggest for buying direct-replacement LiFePO4 batteries in Europe? (For traction, not for startup).
I'd need them for an old 48V Oxygen Lepton e-scooter.
Direct lead battery replacement by LiFePO4
-
- Posts: 870
- Joined: Tue Apr 01, 2008 5:27 pm
- Location: Galashiels, Scottish Borders
- Contact:
Re: Direct lead battery replacement by LiFePO4
It will be because of the voltage ratings used on whatever bms circuitry is built into their 12v batteries. They probably have some ~60 volt rated components so that is what limits you to 4 (12 volt) batteries in series.
Lithium cells must never be over or undercharged. Even one occurrence will probably kill your investment. I recommend a bms that will prevent that from happening. All cells should be monitored individually, pack voltage is not a good enough indicator.
Greg
P.S. I have a spare 16 cell minibms system available. PM me if interested.
Lithium cells must never be over or undercharged. Even one occurrence will probably kill your investment. I recommend a bms that will prevent that from happening. All cells should be monitored individually, pack voltage is not a good enough indicator.
Greg
P.S. I have a spare 16 cell minibms system available. PM me if interested.
Greg Fordyce
Daewoo Matiz
http://www.evalbum.com/4191
Daewoo Matiz
http://www.evalbum.com/4191
Return to “All things battery related”
Who is online
Users browsing this forum: No registered users and 22 guests