I recently purchased a 48V 200AH Lithium Iron Phosphate (LiFePO4) battery from China for a tiny-home application. It is composed of 16 3.2V cells, for a nominal voltage of 51.2:
https://www.aliexpress.com/item/Ele...ication-base-station-back-up/32860113530.html
The battery does not come with an AC charger, and I’ve been trying to rack my brain around how exactly I will accomplish this task.
The instruction manual for the battery states that the battery is to be charged at at a constant current (66A) until 3.65V x 16 (58.4V), and then to continue charging at a constant voltage of 58.4V (as the current drops off). Charging is to be terminated when the current tapers to 6.6A.
I’ve searched for a charger that can accomplish this, and so far have fallen flat. The closest that I came was this product:
https://www.aliexpress.com/item/LTO...harger-54-6V-24v-36V-48V-60V/32904435102.html
The charger can be set to constant current or constant voltage charing modes. However, it does not have stopping criteria. I was thinking of just setting the device on constant voltage mode. (The initial current would be limited by the input power, and thus would be under the 66A.) The question is - is there something that I can build or but that would cut off the battery charging when the charging current drops to below 6.6A.
Does anyone have any ideas? Am I thinking about this right, or dose anyone else have any advice? I don’t have a ton of experience with electrical circuits, but can learn quickly!
Thanks all in advance for your help!
https://www.aliexpress.com/item/Ele...ication-base-station-back-up/32860113530.html
The battery does not come with an AC charger, and I’ve been trying to rack my brain around how exactly I will accomplish this task.
The instruction manual for the battery states that the battery is to be charged at at a constant current (66A) until 3.65V x 16 (58.4V), and then to continue charging at a constant voltage of 58.4V (as the current drops off). Charging is to be terminated when the current tapers to 6.6A.
I’ve searched for a charger that can accomplish this, and so far have fallen flat. The closest that I came was this product:
https://www.aliexpress.com/item/LTO...harger-54-6V-24v-36V-48V-60V/32904435102.html
The charger can be set to constant current or constant voltage charing modes. However, it does not have stopping criteria. I was thinking of just setting the device on constant voltage mode. (The initial current would be limited by the input power, and thus would be under the 66A.) The question is - is there something that I can build or but that would cut off the battery charging when the charging current drops to below 6.6A.
Does anyone have any ideas? Am I thinking about this right, or dose anyone else have any advice? I don’t have a ton of experience with electrical circuits, but can learn quickly!
Thanks all in advance for your help!