How to slove voltage drop ?

[Sudhakar.R]

Hello,

I'm using bldc motor. Battery Voltage is 40.4V. I run the motor on no load the battery voltage is 40.4V and when I apply the load the voltage is dropping.

load(current) is 1A & voltage is 40.3V

load(current) is 2A & voltage is 40.2V

load(current) is 3A & voltage is 40.1V

load(current) is 4A & voltage is 39.9V

how to slove this problem if any one know help me.

[Sudhakar.R]

our System Design,

I'm working on EV Two wheeler Cluster. I measure the voltage from battery using voltage divider method.

the battery voltage (31 - 40.5) is convert into battery percentage(0 - 99).

In driving time, the voltage is dropping depends on the load. the load is 4A that time the battery is 20 percentage decreas. this is affect the SOC.

[LCE]

For a really good evaluation of battery charge status, you need more than the voltage.

At least know the capacity (Wh), constantly measure voltage and current over time.