"SouthROL" Daly 8S BMS clone... 0 current?

[falgsc-al]

Greetings,

Working with a new 8S BMS, I believe a Daly/Deligreen clone. Have gone through and sucessfully connected it to PC via PC Master, to my iphone and Galaxy Tab with Smart BMS. I have it wired to a fresh off the boat set of 8S 302ah EEL cells.

Biggest issue I have RN is that it has never shown any current. I can verify incoming current via meter, solar controller, watching cell volts rise, etc but the meter has never moved from 0.

Any assistance in this matter is greatly appreciated

 

[John Frum]

Are you passing any current through it?

 

[falgsc-al]

Yes, via the solar controller. Up to 40A yesterday. The charge mosfets are working as it is now limiting because it wont balance either, so I believe the wiring is correct.

 

[John Frum]

Yes, via the solar controller. Up to 40A yesterday. The charge mosfets are working as it is now limiting because it wont balance either, so I believe the wiring is correct.

Having trouble parsing that.
How do you know the charge fets are working?
I can't verify the wiring as I can't really see any detail in the pictures.
Please post a screen shot of the main status page of the android app.

 

[falgsc-al]

Sorry my android is not logged in here.

 

[John Frum]

Under battery strings I only see 6 of the 8 cells.
One of which is way out of spec high.
I also see that your BMS has tripped.
It looks like you didn't top balance, confirm?

 

[John Frum]

Since the charge fets are open you should not be able to get any current flow into the pack.
Please double check the cell voltages with your dvom.
If that cell is really exceeding 3.65 volts you should discharge the pack until all cells are < 3.5 volts.

 

[falgsc-al]

No I did not top balance, I conjured this together to shortcut some charging individually... my charger only does 1 at a time so I am trying to reduce the final top off by charging some directly from the solar. They have charged, but the balance function has never come on and the current meter has never registered incoming current from the solar controller.

 

[John Frum]

No I did not top balance, I conjured this together to shortcut some charging individually... my charger only does 1 at a time so I am trying to reduce the final top off by charging some directly from the solar. They have charged, but the balance function has never come on and the current meter has never registered incoming current from the solar controller.

Your cells are out of spec high, you run the risk of severely damaging them.
If it was me I would deal to this immediately.

 

[falgsc-al]

Not enough screen, had to scroll down

 

[John Frum]

Cell 4, 5, 6 and cell 8 are out of spec high.

 

[John Frum]

Cell 4, 5, 6 and cell 8 are out of spec high.

Oops none of your cells are out of spec high.
2.5-3.65 is the safe range.
Gonna go have a cup of coffee.
However, I do see a bms trip.
We need to find out why the bms tripped.

 

[John Frum]

Cell #4 is out of spec.
Having trouble seeing this morning.

 

[falgsc-al]

I have a cell with alligator clips that I attach to help the high cells. This set up is only temporary, the final product will be a 3P/8S pack. I am trying to test as many of these cells as I can and the BMS while I still have some dispute period left.

 

[John Frum]

I have a cell with alligator clips that I attach to help the high cells. This set up is only temporary, the final product will be a 3P/8S pack. I am trying to test as many of these cells as I can and the BMS while I still have some dispute period left.

That is fine but it doesn't address my concerns

 

[falgsc-al]

It actually did, the BMS is allowing charging again as the 3.7V cells have dropped below the shutoff voltage.

 

[John Frum]

It actually did, the BMS is allowing charging again as the 3.7V cells have dropped below the shutoff voltage.

You need to bleed some energy off that cell or the bms will just keep tripping.
While the charge fets are closed you should see current going into the battery.
Also if you discharge the pack you should see current going out of the battery.
Until both of those observations are made I would not trust the bms configuration.

 

[falgsc-al]

This issue is still ongoing. I continued to use this setup to get some cells charged and finished topping them off on the regulated charger until they reached 3.65v@.1A, which luckily only took about 40min to an hour per cell. I wired them back into the BMS, reset to factory defaults and plugged in the information... and set the SOC to 100%. Still will not read current.

So I have been back and forth with the seller South LAN on Aliexpress, and so far he has sent me one "upgrade" for PC master.

Seems much like the old version.

So ongoing issues with the SouthROL BMS are as follows:
Current meter always reads 0
Has not yet turned on balancing
Does not read error logs in PC master
I question whether factory default in the android/ios app does anything, it kept all the old settings.

 

[falgsc-al]

I finally figured out the current reading issue. The current sense resistor was set to 9mR, I saw most folks had it set to 0.1 and corrected it. Now reading current although its a bit off.

 

[John Frum]

I finally figured out the current reading issue. The current sense resistor was set to 9mR, I saw most folks had it set to 0.1 and corrected it. Now reading current although its a bit off.

Did you change that setting or did it come with a bad configuration?
Did you purchase this from Current connected?
If yes, you should let them know.
If one setting was bad on arrival, all the key/vals should be checked.