Hi I have problem with this 4S BMS. I connect all batteries in correct way but on P- P+ I have just 15V. On B+ B- I have 16,77V... Why this happen? And also when I connect load on P- P+ it give 0V so seems to be in protecting mode... Please help me. Thanks
BMS wrong voltage end no output with load
- Thread starter gfucka
- Start date
Hwy89
10 kW
Check the voltage on the individual cells. I suspect one or more of them are below the cut off voltage level of the BMS and it is shut down as is normal.
Does it require the temperature sensor be connected to "NTC" pads? Some do, some don't. If yours does, it may disable the output if it doesn't get the right resistance reading at those pins. If so, you would have to install the correct NTC temperature sensor part to those pins.
Hwy89
10 kW
Sorry, my mistake. I misread your post and thought that you only has 15V between b- and b+. Oops!
You have to look at the documentation for it to find out:gfucka said:
--does it require the NTC?
--*which* NTC does it require?
If it doesn't have documentation, then you can only guess at either of those things.
It's the most common kind, so the safest first bet.
kdog
10 kW
Some of these small bms's require a charge to turn on. You might have to discharge the cells a bit to get it to charge... to turn on.
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