How many cells will be in the series?
When you parallel batteries, they passively equalize to each other by being connected to each other. This is not the case for the series batteries though.
I use a blue-tooth controlled BMS, it has all these functions:
- Cell High Alarm
- Cell Low Alarm
- Cell Hight Protect
- Cell Low Protect
- Total Volt High Protect (this protects the entire battery, not just the cell)
- Total Volt Low Protect
- Charge Over Current Protect
- Discharge Over Current Protect (This means it will turn off the battery before you even come close to tripping a circuit breaker)
- Cell Difference to start Balancing
- Charge High-Temperature Protection
- Discharge High-Temperature Protection
- Mosfet high-temperature protection (The BMS has built-in protection for itself!)
- Charge Low-Temperature Protection
- Discharge Low-Temperature Protection
- System Shut down cell voltage - This is probably the most important protection you can have, never empty a LiFePO4 battery to its absolute minimum.
This is what I bought:
You can use 4p wire to connect bms and lcd display. 8S to 20S version : 8S to 20S Li-ion Battery; 8S to 20S Lifepo4 Battery; 8S to 20S LTO Battery. 7-16S Li-ion Battery; 8-16S Lifepo4 Battery; 8-16S Titanium LTO lithium.
www.ebay.com
I have a 16S setup. I have the little LCD screen with it, but you do not have to have the screen, everything is on your Bluetooth connected app. This BMS shows how to set up any number of series batteries, 2-20. The LCD shows capability to work with upto a 32S BMS.
I have already had the protect mode come on from Cell High Volt, Cell Low Volt, Discharge Over Current (I had it set way too low). My charger is controlled through its front panel, and a software program on a computer.
Controlling the voltage and current during a low-temperature setting is all on me to set it right.