Also - Shouldn't charging current be negative and discharging current be positive, like other BMS's show.?
Correction. I calibrated the shunt with charge, then discharge amps, and all is well now.Mine started to show correct SOC after I defaulted it.
However
The current does not go negative (below 0) when there is a net load.
If I am charging with say 6amps, and turn on a 4amp load, the current reading drops to 4amps. All good. However if I turn off the charging so that there are 0 amps, and turn on the 2a load, the current stays at 0amps.
Has anyone else tested this.?
Could be an easy fix in the firmware.
Did you extract the zip file, then select the .hex file.? Did you reboot PC, then check com port and try again.?I tried to update firmware. Driver added with success message.
Identifies chargery at COM 5 and in device manager.
hit update after selectIng correct firmware file.
and nothing. Ultimately get time out message. Any suggestions?View attachment 16299
Mine started to show correct SOC after I defaulted it.
However
The current does not go negative (below 0) when there is a net load.
If I am charging with say 6amps, and turn on a 4amp load, the current reading drops to 4amps. All good. However if I turn off the charging so that there are 0 amps, and turn on the 2a load, the current stays at 0amps.
Has anyone else tested this.?
Could be an easy fix in the firmware.
At least ya figured it out.I found my issue. We had downloaded the wrong hex file initially. I feel silly. Didn’t read closely.
I second the recommendation of reading the instructions!
I am on 4.05 version and had the same issue. It shows that it can see the full charge (24v plus) but SoC was zero. Just do a software reset and reboot and it started working fine.Am I understanding that those with Firmware versions 4.0 should just reset the BMS to default settings to get the SOC info corrected?
I helped a friend assemble a 4 cell, 12V, 280Ah battery and this issue has persisted (SOC stuck @ zero).
Thank you
Doug
Wise words, Steve, but the shunt wasn't the issue in this case. It wasn't misreading the current or voltage... just showing the SoC as zero even as it showed having 24V being read.I have mentioned this several times,
BE CERTAIN that the Shunt Surfaces are "clean" and no waxes or oil residues are on it. It WILL muff up readings, Guaranteed.
(wipe down with Rubbing Alcohol)
Same goes for the Ring Terminals on the Shunt Leads.
The RED Wire on the Shunt Leads is ALWAYS towards the Battery !
Shunt is installed on the Negative Side only.
Ensure that the connections to the BMS Main Unit are firmly & properly seated into place.
I would prefer they fix and continue to improve the software of what we have already bought!But it is sensing from the shunt and if it is even the slightest bit out everything else goes awry. BTDT and chased such gremlins over a month with the Same Assumption as you. I reset the BMS whenever I flash which means a few more steps to enter the data but I don't mind that.
It will be so nice once the B & P series models are released.
I am very limited as to what I can say.With the B/P models, what are they changing and what problems are they trying to address with the new hardware? Is there a good write up of what they are up to?