Hi everyone!
I'm building a 24S LiFePo4 pack. The chargers for these packs have a cutoff at 87.6V.
Could I also use a 20S regular lithium charger for my pack? It should work, right? As far as I know, they're both CCCV chargers.
The only thing is that the 20S charger has an end voltage of 84V, meaning I would charge to only 3.5V per cell, or 96% of max capacity.
This isn't an issue for me, and it would even reduce degradation. Am I missing something here? I'm pretty sure it would work, but burning my house down because I missed something would be less than ideal, so a confirmation would be much appreciated.
Oh, another thought just popped in: There's quite a lot of periods where I don't use my battery. Could I limit the SoC by putting a couple of diodes between the charger and battery? With a forward voltage drop of 0.6V, could I put 6 in series to reduce the cell charge voltage to 3.3V (which equates to about 70% SoC)? Limiting pack SoC when putting it away for large periods of time greatly improves pack life, but is this an accepted way of doing so? I can't really find chargers which have this option, except for one in a US store (with 110V rating and expensive shipping).
Thanks!
I'm building a 24S LiFePo4 pack. The chargers for these packs have a cutoff at 87.6V.
Could I also use a 20S regular lithium charger for my pack? It should work, right? As far as I know, they're both CCCV chargers.
The only thing is that the 20S charger has an end voltage of 84V, meaning I would charge to only 3.5V per cell, or 96% of max capacity.
This isn't an issue for me, and it would even reduce degradation. Am I missing something here? I'm pretty sure it would work, but burning my house down because I missed something would be less than ideal, so a confirmation would be much appreciated.
Oh, another thought just popped in: There's quite a lot of periods where I don't use my battery. Could I limit the SoC by putting a couple of diodes between the charger and battery? With a forward voltage drop of 0.6V, could I put 6 in series to reduce the cell charge voltage to 3.3V (which equates to about 70% SoC)? Limiting pack SoC when putting it away for large periods of time greatly improves pack life, but is this an accepted way of doing so? I can't really find chargers which have this option, except for one in a US store (with 110V rating and expensive shipping).
Thanks!