Relay-Based JBD BMS Idle Consumption - ~1.2W

[TorC]

Looking at getting two of the 300A JBD relay based BMS units for 2P,16S, but am somewhat concerned about how much power they'll use. The datasheet on the site is the same as for the FET based one, and looks very wrong to my eye. Anyone know or can readily measure what it actually uses?

7S 8S 10S 12S 13S 14S 15S 16S 20S 48V 60V 72V li ion or Lifepo4 smart Bluetooth BMS support 200A or 300A constant charge and discharge current electric relay BMS - LLT POWER ELECTRONIC

1) Application:this smart BMS can work for 7S to 21S Lithium ion or Lifepo4 Battery ,the BMS can recognize different series battery automatically with different connection methods as we posted 2) Current : Constant current can be 200A or 300A with charge and discharge 3) with Max 160mA balance...

www.lithiumbatterypcb.com

 

[TorC]

@drbytes It looks like you have this JBD BMS I'm looking at. Did you ever measure idle on current of the BMS, or if not, would you check if there is a part number on the relay that might lead me to a datasheet for it?

 

[jontm]

Based on the pictures it look like a Kilovac EV200AAANA. These are very cheap in China now for some reason. Clones or not, i purchased a couple and they perform exactly according to the datasheet of the relay. They weigh exactly the same as the datasheet say they should, the on resistance is correct and they consume about 1.2 W in the on state, exactly as in the datasheet. If you want a relay or mosfet based BMS depends a bit on your application. The relays have lower on resistance and much higher short circuit ratings. So for high current applications it is likely that they consume and waste less power than mosfet based BMS systems. For low power applications they are not really needed and the 1.2 W might be a showstopper.

 

[TorC]

Thanks for that confirmation, @jontm. I came across a couple pictures last night and found that datasheet. I'm glad to know that bears out in the real world.