Hello all,
I have quite a specific application, where I need a high voltage supply (85v-120v) that is capable of outputting up to 2A continuous.
I currently own a 13S2P, 21700 pack, with an average cell capacity of 4300mAh.
Is it a bad idea to take this pack and create two 13S1P packs, each with an independent BMS (I would purchase a new one). I would then charge each pack with a 48V mains charger at the same time, while the batteries are connected in series. The reason for this is that 96V packs seem to be very expensive / and also not suitable for 1S applications (very high output current). Also, I would be relying on each BMS to cutoff at the correct voltage - which I'm a little cautious about.
I guess I have three areas of questions:
1. How will the balancing of the packs work out during discharge, with two separate BMSs? Would the slight imbalance cause problems? How big would this problem be?
2. Can I even connect two chargers effectively in series? Would they reference mains ground somehow? (bad news!)
3. Is there a better way of doing this?
BMS: https://www.aliexpress.com/item/1005003162150119.html?spm=a2g0o.store_pc_groupList.8148356.7.42ae20d9drGIZP
Charger: https://www.aliexpress.com/item/1005003136109249.html?spm=a2g0o.store_pc_groupList.8148356.31.130a4cfbwJ3uRY
Many thanks in advance
I have quite a specific application, where I need a high voltage supply (85v-120v) that is capable of outputting up to 2A continuous.
I currently own a 13S2P, 21700 pack, with an average cell capacity of 4300mAh.
Is it a bad idea to take this pack and create two 13S1P packs, each with an independent BMS (I would purchase a new one). I would then charge each pack with a 48V mains charger at the same time, while the batteries are connected in series. The reason for this is that 96V packs seem to be very expensive / and also not suitable for 1S applications (very high output current). Also, I would be relying on each BMS to cutoff at the correct voltage - which I'm a little cautious about.
I guess I have three areas of questions:
1. How will the balancing of the packs work out during discharge, with two separate BMSs? Would the slight imbalance cause problems? How big would this problem be?
2. Can I even connect two chargers effectively in series? Would they reference mains ground somehow? (bad news!)
3. Is there a better way of doing this?
BMS: https://www.aliexpress.com/item/1005003162150119.html?spm=a2g0o.store_pc_groupList.8148356.7.42ae20d9drGIZP
Charger: https://www.aliexpress.com/item/1005003136109249.html?spm=a2g0o.store_pc_groupList.8148356.31.130a4cfbwJ3uRY
Many thanks in advance