Recent content by Burke

Below is the updated wiring diagram. You need to connect the ACC+ to the Pre-Charge + wires in order to power the 12V releays.

The Pre-Charge would bypass the main charge and discharge contactors to charge the capacitors in the inverter. It needs a resistor to prevent a large inrush of current which is very hard on contactors, and can cause damage. I would guess that when you turn on the BMS there is a timed function...

My issue was not bringing the ACC+ power to the Pre-Charge+ line for sure. The other point you bring up is an interesting one though, which relay to use if you are only using one (Charge/Discharge). The BMS will shut down the battery if it sees a bad situation. I am assuming that the worst...

I have figured out how to power up the relays by testing the unused wires out of the BMS. Apparently the Pre-Charge+ cable is also where the V+ comes from to power the relays (Charge/Discharge/Pre-Charge). I wired the ACC+ wire to the Pre-Charge+ wire with a crimp connector (I am not using...

The precharge circuit would be used to charge the capacitors in the inverter, it does need a resistive load to prevent a too fast inrush of current, or a resistor. Once the capacitors are charged, power is turned on to the inverter. After that the precharge circuit should be switched off. The...

Thanks. I get no voltage from the relay wires coming from the BMS. There are a lot of unused wires in the extra connector where the relay leads are. Can you share how you wired it if you have this BMS? :) I can post the leads that are not wired later if that helps.

I have the 2A balance version of this BMS and just wired it in yesterday. Everything works fine except the discharge relay does not power up. The relay energizes and passes the main current from the battery if I put 12V DC to the relay from a separate power supply so it isn't the relay. It is...

In your diagram and in other references B- goes to the terminal of the first negative battery, along with the output cable. V- also goes there. You can crimp both into the same connector for the battery terminal.

Yes I would guess that the pack wasn't fully charged. If it starts to balance out over time, that is likely why it took on more initially. There could also be something wrong with your settings, shunt, etc also. You should verify everything is set right also.

Upgrading the BMS as the Balancing and Power out for the Screen failed on the BMS, but other functions seem to still be working. Moving to the JK-B2A25S-RP balancer which uses relays to switch power. Once I get the new one in I will open up the old one and see if I can determine what happened...

Hi Luke Your BMS has an active cell balancer so you only need to use that and not the separate active balancer. Your BMS is a bit different than the one Andy is using, which uses an internal bank of electronic switches to turn the power on and off. Your BMS needs external relays to work. You...

I have the 2A version of this BMS and am about to install it (finally) and have found little documentation. I did find two diagrams that together tell the wiring story though. Also posted this in the other thread for this BMS I found this diagram which is in English. The diagram below is...

Also posted this in the other thread for this BMS I have the same BMS to upgrade an older failed unit. I found this diagram which is in English. The diagram below is from a Chinese manual I found for the JK-B2A25S-RP which has English labelled pin outs that actually match what the cables...

The diagram below is from a Chinese manual I found for the JK-B2A25S-RP which has English labelled pin outs that actually match what the cables are labeled with. This is what I was guessing from the diagram posted just prior, but nice to have confirmation. I am going to install likely today to...

I have the same BMS to upgrade an older failed unit. I found this diagram which is in English.