Idle current measurements in 16S LFP setup: The BMS draws ~45 mA (~2.4W) awake, but with no current on the battery. After about a day with no current on the battery, the BMS will drop the relay (you hear it click) and switch to a draw of about 9 mA (~0.5W). The battery still measures full voltage, so the BMS must also use a FET to provide voltage and sense a load. After a few more days with no load on the battery, the BMS will go to sleep. All the LEDs are dark, the BMS is drawing about 0.9 mA (~50mW), yet the battery still measures full voltage.
Applying a load to the battery (I used a 100W light bulb) causes the BMS to instantly wake up and set the relay. The LEDs are then flashing again. The process will repeat if you leave it without a load again.
Note here that "battery" means the series cells plus the BMS in functional configuration.
Applying a load to the battery (I used a 100W light bulb) causes the BMS to instantly wake up and set the relay. The LEDs are then flashing again. The process will repeat if you leave it without a load again.
Note here that "battery" means the series cells plus the BMS in functional configuration.