Diysolar123
Solar Addict
- Joined
- Feb 28, 2021
- Messages
- 675
I have the daly smart bms 8s, 100amp plugged into the computer and the program is showing me what is going on(or so I thought).
I was charging the 8S pack at 18amps, cell high voltage set to 3.6, low set to 3.0, balance set to start at 3.5v...all seems well.
So I leave it for an hour, come back and look, and what do I see?
the data monitoring screen happily shows cell #3 at 3.7 volts in red and it is listed as an alarm, (the rest of the cells are at 3.4), scarily, the pack is STILL charging at 18amps?
I thought the daly bms would disconnect if any cell exceeds the cell high voltage?
what is the "logic" around cell balancing with the daly smart series?
i would have expected the bms to disconnect the charge current and then drain the high cell (even if it is only draining at 30ish ma's). If it keeps the charge current going (in my case 18amps) AND is trying to manage the overvoltage of cell #3 by draining 30ma, well, thats not going to work!
I set the pack max voltage down to 28.0 and set my power supply right at 28 as well to see what it does with an input overvoltage.
The daly would constantly connect and disconnect, there appears to be no hysterisis sadly as the voltage fluttered around 28.
At least the pack high voltage caused a disconnect but the cell over-voltage, well, seems more forgiving.
For those that have experience with the pc software application, are there any other critical settings that are needed so the bms really does protect the cells?
Is there some mode where the bms is sending data out the serial port but not actually doing anything when alarms happen (other than the pc software showing the cell in red)?
Thanks for any help
(I have an overkill solar smart bms just to see how that stacks up! but it is 50% more money so it would be nice if the daly smart bms actually worked)
I was charging the 8S pack at 18amps, cell high voltage set to 3.6, low set to 3.0, balance set to start at 3.5v...all seems well.
So I leave it for an hour, come back and look, and what do I see?
the data monitoring screen happily shows cell #3 at 3.7 volts in red and it is listed as an alarm, (the rest of the cells are at 3.4), scarily, the pack is STILL charging at 18amps?
I thought the daly bms would disconnect if any cell exceeds the cell high voltage?
what is the "logic" around cell balancing with the daly smart series?
i would have expected the bms to disconnect the charge current and then drain the high cell (even if it is only draining at 30ish ma's). If it keeps the charge current going (in my case 18amps) AND is trying to manage the overvoltage of cell #3 by draining 30ma, well, thats not going to work!
I set the pack max voltage down to 28.0 and set my power supply right at 28 as well to see what it does with an input overvoltage.
The daly would constantly connect and disconnect, there appears to be no hysterisis sadly as the voltage fluttered around 28.
At least the pack high voltage caused a disconnect but the cell over-voltage, well, seems more forgiving.
For those that have experience with the pc software application, are there any other critical settings that are needed so the bms really does protect the cells?
Is there some mode where the bms is sending data out the serial port but not actually doing anything when alarms happen (other than the pc software showing the cell in red)?
Thanks for any help
(I have an overkill solar smart bms just to see how that stacks up! but it is 50% more money so it would be nice if the daly smart bms actually worked)