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Interesting BMS purchase

Supervstech

Supervstech

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Ok, so I took a chance and ordered a relay based 16S 200A BMS…
He picture looked cheap, but I took a chance on it.


What I got was completely different.
A VERY nice HUGE jbd BMS with massive silicone cables, and a fuse.

I will post pics of it soon as I get home tonight, but it looks able to handle end thing.

It has a completely different relay and huge full length heat sinks on both sides.

Impressed so far.

It also has an RX and TX rs485 port I gotta figure out.
 
So the BMS can be used for 8S 10S 12S 13S 14S 16S Cells combination, but there are two variations, one Li-ion and one Lifepo4.

I wonder if it could it had be possible to use the same BMS for both using a jumper or an App setting?

But I guess, this would had required more flash memory to store the absorption current charging curbe?
 
Supervstech said:
Ok, so I took a chance and ordered a relay based 16S 200A BMS…
He picture looked cheap, but I took a chance on it.


What I got was completely different.
A VERY nice HUGE jbd BMS with massive silicone cables, and a fuse.

I will post pics of it soon as I get home tonight, but it looks able to handle end thing.

It has a completely different relay and huge full length heat sinks on both sides.

Impressed so far.

It also has an RX and TX rs485 port I gotta figure out.
Click to expand...
It isn't this one? I bought two from Docan, shipped with my cells from China.

JBD-AP20S003

0e812ab976fc5a4f9fb6b10973ba9397.jpg
 
It also came bundled with a fuse, but I cannot find it...
Looked like a mega fuse, so I wouldn't use it on lithium anyway.
 
Looks like this one,
www.lithiumbatterypcb.com

7S 8S 10S 12S 13S 14S 15S 16S 20S 24V 36V 48V 60V 72V li ion or Lifepo4 smart Bluetooth BMS support 200A constant charge and discharge current - 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 www.lithiumbatterypcb.com

Mike
 
Supervstech said:
Nope, about twice the size of that one, and has a square relay under the heat shield now.
Click to expand...
Looks like the same control board in both of them. Only the relay looks different to me. 400A mega fuse is also included with the 003 model.
 
So how does this relay BMS work. Is the relay on when the battery is good and falls off when the voltage is low, which means it will draw X A constantly ? Or does the relay turn on when the voltage is too low disconnecting the battery, which means it will draw X A from an empty battery until it is completely dead?
 
conquistador said:
So how does this relay BMS work. Is the relay on when the battery is good and falls off when the voltage is low, which means it will draw X A constantly ? Or does the relay turn on when the voltage is too low disconnecting the battery, which means it will draw X A from an empty battery until it is completely dead?
Click to expand...
On the AP20S003 model the relay seems to be magnetically latching, and only uses current to switch states. I have not measured the idle current for the whole BMS yet, but I need to do that. I have had mine hooked up for almost two weeks (not charging or discharging) and the voltage is very similar to when I hooked them up.
 
For the AP20S003, the idle current is about 45mA with the relay on. It is less than 10mA with it off. Battery voltage was 52.8VDC, so under 2.4W at idle. This test had the meter between the positive battery lug and the two red BMS wires (one for top sense, the other for BMS power).

The blue LEDs eventually extinguish, so maybe the BMS goes into a deep sleep when idle. I'll measure it again after that happens.
 
So I wonder if someone place an order with AMZ, which one they will ship out next time.

Supervstech, did you notify the seller that what you receive is not the same one as shown in their pictures?​

 
Last edited:
I had ordered the version with the open relay and later was told the black enclosed was the new version they were providing. For what it’s worth.
 
justgary said:
For the AP20S003, the idle current is about 45mA with the relay on. It is less than 10mA with it off. Battery voltage was 52.8VDC, so under 2.4W at idle.
Click to expand...
This sounds very good values. I had expected much higher current for this type of relay.
 
I like the newer models having the relays under the aluminum heat shield. That is like the one I am using for a friends build in the works. sounds like a good buy and hope it works well. please post review of it when you can.

I think Lithium Battery PCB sells a 300 amp version as well.
 
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