Tomtennant
New Member
- Joined
- May 21, 2021
- Messages
- 7
This is a home system being used for emergency power only. This is not used daily (or even monthly). I started this project after the Texas freeze and was without all power for a week.
I purchased a 24v inverter and have 8 x 280ah LiFePO cells in series. I have a Daly 8s 250a BMS and a separate 30a 24V (29v) charger that i power from the grid. There are no solar panels involved in my setup.
I wanted to have a little more backup so I purchased 8 more cells. However, I am getting 310ah cells this time (it is what it is). I've read you shouldn't combine batteries if they have different ah ratings as the smaller one would drain faster and the larger one wastes energy trying to change the smaller one. Eventually cells can become damaged due to the difference. Most discussions talk about combining vastly different sizes - like a 50ah battery and a 200ah one.
Should I just create a separate 8s 24v battery and keep them completely separate or can I make an 8s2p with these cells? Are these cells "close enough" that for my purpose it will be "good enough"?
If I do the separate 8s battery, I'll have to get a different BMS and figure out how to connect them to the inverter and charger so the 280 set doesn't pull the 310 set down.
If i combine them into an 8s2p setup, will the single charger and single 8s BMS charge each cell correctly?
What else am I missing?
I purchased a 24v inverter and have 8 x 280ah LiFePO cells in series. I have a Daly 8s 250a BMS and a separate 30a 24V (29v) charger that i power from the grid. There are no solar panels involved in my setup.
I wanted to have a little more backup so I purchased 8 more cells. However, I am getting 310ah cells this time (it is what it is). I've read you shouldn't combine batteries if they have different ah ratings as the smaller one would drain faster and the larger one wastes energy trying to change the smaller one. Eventually cells can become damaged due to the difference. Most discussions talk about combining vastly different sizes - like a 50ah battery and a 200ah one.
Should I just create a separate 8s 24v battery and keep them completely separate or can I make an 8s2p with these cells? Are these cells "close enough" that for my purpose it will be "good enough"?
If I do the separate 8s battery, I'll have to get a different BMS and figure out how to connect them to the inverter and charger so the 280 set doesn't pull the 310 set down.
If i combine them into an 8s2p setup, will the single charger and single 8s BMS charge each cell correctly?
What else am I missing?