need bms advice please

robowarman

New member
Joined
Feb 11, 2023
Messages
13
hi guys i need some advice on a suitable bms please. i have lots of used 18650 cells (100) and i am wanting to make a 14.4volt battery pack to run some 12/24v led lighting. the pack will be charged with a solar panel. can anyone point me in the right direction or give me a link, i am new to all this. thank you.
 
hi there... start from the FAQ section and then search into battery builds:

DIY Battery Project Builds​

https://secondlifestorage.com/index.php?forums/diy-battery-project-builds.36/

Leds are current driven, not voltage driven if I remember right, I'm not so good with leds... right now I'm wondering what kind of circuit / driver I'd need between the battery and the leds to power them... 😁

Lets say that a 18650 cell is nominal 3.7V. You can make a 14.8V battery mounting them in series of 4. So your battery could be a nice 4s25p, 4 series of 25 cells (in parallel) for a total of 100 cells. Fully charged it would reach 16.8V (4.2V x 4 in series). You also decide the lowest voltage at which you use drain your batteries, lets say 3.2V, so your minimum voltage would be 12.8V (3.2V x 4). Hope this is not too advanced for you (and sorry if I went too basic!). This could be a good book to start with: "Micah Toll - DIY Lithium Batteries".

Start your research looking into battery builds, then BMSs and then chargers. I'd start from these three points, there's a forum section for each of these.

Your BMS choice depends on the battery, that's why I'd start from learning about cells and batteries first.
 
Last edited:
hi there... start from the FAQ section and then search into battery builds:

DIY Battery Project Builds​

https://secondlifestorage.com/index.php?forums/diy-battery-project-builds.36/

Leds are current driven, not voltage driven if I remember right, I'm not so good with leds... right now I'm wondering what kind of circuit / driver I'd need between the battery and the leds to power them... 😁

Lets say that a 18650 cell is nominal 3.7V. You can make a 14.8V battery mounting them in series of 4. So your battery could be a nice 4s25p, 4 series of 25 cells (in parallel) for a total of 100 cells. Fully charged it would reach 16.8V (4.2V x 4 in series). You also decide the lowest voltage at which you use drain your batteries, lets say 3.2V, so your minimum voltage would be 12.8V (3.2V x 4). Hope this is not too advanced for you (and sorry if I went too basic!). This could be a good book to start with: "Micah Toll - DIY Lithium Batteries".

Start your research looking into battery builds, then BMSs and then chargers. I'd start from these three points, there's a forum section for each of these.

Your BMS choice depends on the battery, that's why I'd start from learning about cells and batteries first.
thank you so much for your reply its greatly appreciated. i will look into each section.
 
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