SOLVED: Is it Normal For BMS Voltage Reads Less Than Battery Pack Voltage?
st4rgut
Registered Users Posts: 27 ✭✭
I tried installing a 16S 48V Lifepo4 Daly BMS today that I bought off Ebay I have a lot of 16 100 Ah 3.2V Lifepo4 Cells that I connected in series and top balanced until the cell voltages were equal. After connecting in series, the batteries had a voltage ranging from 3.631 to 3.637 V, which I find odd. I confirmed the wire order of the balancing wires to the BMS by measuring the voltages before connecting to the BMS. I then connected B- lede of the BMS to the negative terminal of the battery pack and then plugged in the balancing wires to the BMS. However, when I measure the voltage across the BMS P- cable and the Battery Pack's positive terminal, I am only getting 47V even though the pack measures 58V. I read that the BMS output is supposed to match the pack output, but can't think of anything I did wrong. Do you think I received a defective BMS? There was no smoke or anything when I plugged everything in, but the output voltage doesnt seem right.
The top picture shows the output voltage of BMS, and the bottom shows the voltage of the battery pack.
SOLVED:
The B- lead should go on TOP of the negative balancing lead. I guess having it the other way causes power to bypass the negative balancing lead, which screws up everything.
The top picture shows the output voltage of BMS, and the bottom shows the voltage of the battery pack.
SOLVED:
The B- lead should go on TOP of the negative balancing lead. I guess having it the other way causes power to bypass the negative balancing lead, which screws up everything.
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