foundingpower programmable bms

mark133 said:
Hi Eason
I changed the CHG_STOP_CURRENT to 2000mA and discharged the battery down to 50%.

While it was charging at one point I thought it was looking good when it was bleeding all cells except one that was catching up and it did this for ages.

At this point 17 cells were very close to each other (17 red lights flashing on and off) and one cell only 25mv out from the highest cell with no red light

And then for some reason the highest voltage cell had its red light on and just rose to the OV figure and the alarm sounded and it just keep going round in a loop charge/OV/discharge

Again it was cell sixteen that was the culprit (charging faster than the rest)

Do you think I should swap this cell out for another as i have a few spares?
Click to expand...

Mark, i forgot to mention that same happened to me while charging 6s pack. One cell was charging faster than the others and my icharger would beep overcharge and switch off without balancing the rest of cells. i did swap that cell, same on the other 6s pack and all went well after that. I had those fast charging cells assembled in to 4s pack and using them in my car as starter battery without BMS and now after 1 month use they stay in balance within .01 volts. I dont know if it is relevant but if you have spare cell try to swap one that's behaving strange.
 
The cell in question my have a higher I.R. and always want to run or give it a couple cycles. It did happen on one of 12s packs as 24s and replaced it's better now and pick up some ah. Have you used it and is it a little flat just a little ?
 
cassschr1 said:
Eason, Do all your bms,s balance cells on the way up to 3.65 ?
Or does balancing start at a certain voltage?
How about when discharging?
Click to expand...

You can set balancing active voltage at a certain value via pc program according to your demands.
Also you can set the value of starting voltage difference and stopping voltage difference.
Balancing will be started on the state of "standby" and "charging",except discharging.
 
agniusm said:
mark133 said:
Hi Eason
I changed the CHG_STOP_CURRENT to 2000mA and discharged the battery down to 50%.

While it was charging at one point I thought it was looking good when it was bleeding all cells except one that was catching up and it did this for ages.

At this point 17 cells were very close to each other (17 red lights flashing on and off) and one cell only 25mv out from the highest cell with no red light

And then for some reason the highest voltage cell had its red light on and just rose to the OV figure and the alarm sounded and it just keep going round in a loop charge/OV/discharge

Again it was cell sixteen that was the culprit (charging faster than the rest)

Do you think I should swap this cell out for another as i have a few spares?
Click to expand...

Mark, i forgot to mention that same happened to me while charging 6s pack. One cell was charging faster than the others and my icharger would beep overcharge and switch off without balancing the rest of cells. i did swap that cell, same on the other 6s pack and all went well after that. I had those fast charging cells assembled in to 4s pack and using them in my car as starter battery without BMS and now after 1 month use they stay in balance within .01 volts. I dont know if it is relevant but if you have spare cell try to swap one that's behaving strange.
Click to expand...

I think so,too. Changing the cell which seems abnormal.
 
I still am not having much luck, in that when the red lights are against each cell ie. meant to be draining they just seem to be rising slowly.

I have now discharged the pack down to 30% twice and then charged it and all it does is just keep going till it hits over voltage 3650mv and the start discharging with the alarm sounding

Am I right in thinking if the red light is on next to the cell the voltage should drop not rise?
 
Hello Foundingpower, with a CS100BT current hall sensor, what value should I enter in the field "Current adjust" (step 2) ?
Thanks
 
Hi Easson
Have you any idea why my pack won't go into some sort of balancing mode?

When the cell is bleeding should it still rise in voltage slowly?
The bleeding cells rise at at very slow rate and the others do catch up slowly but as I said the bleeding cells are still rising!!

Everything looks good until the first cell hits the CHG_RECOVER figure and then it just lets go and rises very fast till it hits the OV_VOLTAGE figure and then the alarm sounds and starts discharging all cells

I have now discharged the pack down to 25% - 30% 5 times

Thanks

Mark
 
jpgey said:
Hello Foundingpower, with a CS100BT current hall sensor, what value should I enter in the field "Current adjust" (step 2) ?
Thanks
Click to expand...

steps:
1.Confirm the BMS is in 'standby' state (charging or discharging stopped), Fill in the valuve of “Hall voltage” to “Center Voltage”(about 2480-2510),then click “step 1”.
2.Load the BMS with an arbitrary, constant discharge current in the range of 50 to 100A using e.g. an accurate electronic load, and fill this current to "Current Adjust", then click "Step 2"
3.Complete the adjustment.
 
mark133 said:
Hi Easson
Have you any idea why my pack won't go into some sort of balancing mode?

When the cell is bleeding should it still rise in voltage slowly?
The bleeding cells rise at at very slow rate and the others do catch up slowly but as I said the bleeding cells are still rising!!

Everything looks good until the first cell hits the CHG_RECOVER figure and then it just lets go and rises very fast till it hits the OV_VOLTAGE figure and then the alarm sounds and starts discharging all cells

I have now discharged the pack down to 25% - 30% 5 times

Thanks

Mark
Click to expand...
Hi,Mark.
Please confirm the BMS can cut off the charging when cells reach CHG_Limit.
Then please :
1.adjust the current first.
2.set CHG_Stop_current to 5000mA.
Please try discharging and charging again.
 
drewjet said:
Foundingpower, your BMS's are very interesting. Your website however, is difficult. I have a 21 series 6 Parallel A123 pack of 20AH cells(6 of the A123 Packs from Victpower), and may go up to 24S . I want a BMS for charging only, I do not want restrictions on Discharge, and would like to charge with up to 40 Amps. Which BMS does this, and how much is it, and how do I order?
Click to expand...

Going to agree with this post here. Still like the look of this BMS.
 
ohzee said:
drewjet said:
Foundingpower, your BMS's are very interesting. Your website however, is difficult. I have a 21 series 6 Parallel A123 pack of 20AH cells(6 of the A123 Packs from Victpower), and may go up to 24S . I want a BMS for charging only, I do not want restrictions on Discharge, and would like to charge with up to 40 Amps. Which BMS does this, and how much is it, and how do I order?
Click to expand...

Going to agree with this post here. Still like the look of this BMS.
Click to expand...
http://www.foundingpower.com/en/Products/Smart_BMS/2012081492.html
This will be OK.
No discharging fets.
Just 4 charging fet can reach 40A charging current.
 
FoundingPower said:
mark133 said:
Hi Easson
Have you any idea why my pack won't go into some sort of balancing mode?

When the cell is bleeding should it still rise in voltage slowly?
The bleeding cells rise at at very slow rate and the others do catch up slowly but as I said the bleeding cells are still rising!!

Everything looks good until the first cell hits the CHG_RECOVER figure and then it just lets go and rises very fast till it hits the OV_VOLTAGE figure and then the alarm sounds and starts discharging all cells

I have now discharged the pack down to 25% - 30% 5 times

Thanks

Mark
Click to expand...
Hi,Mark.
Please confirm the BMS can cut off the charging when cells reach CHG_Limit.
Then please :
1.adjust the current first.
2.set CHG_Stop_current to 5000mA.
Please try discharging and charging again.
Click to expand...

Hi Eason
It never really gets as far as the chg_limit due to the first cell that hits the chg_recover and then that cell races up to the ov_limit
Another thing I've noticed is that it never reads that it's charging it just shows its in standby!!!!!

Will try the new chg_stop figure tonight

Thanks
 
FoundingPower said:
jpgey said:
Hello Foundingpower, with a CS100BT current hall sensor, what value should I enter in the field "Current adjust" (step 2) ?
Thanks
Click to expand...

steps:
1.Confirm the BMS is in 'standby' state (charging or discharging stopped), Fill in the valuve of “Hall voltage” to “Center Voltage”(about 2480-2510),then click “step 1”.
2.Load the BMS with an arbitrary, constant discharge current in the range of 50 to 100A using e.g. an accurate electronic load, and fill this current to "Current Adjust", then click "Step 2"
3.Complete the adjustment.
Click to expand...

Thanks !
 
mark133 said:
FoundingPower said:
mark133 said:
Hi Easson
Have you any idea why my pack won't go into some sort of balancing mode?

When the cell is bleeding should it still rise in voltage slowly?
The bleeding cells rise at at very slow rate and the others do catch up slowly but as I said the bleeding cells are still rising!!

Everything looks good until the first cell hits the CHG_RECOVER figure and then it just lets go and rises very fast till it hits the OV_VOLTAGE figure and then the alarm sounds and starts discharging all cells

I have now discharged the pack down to 25% - 30% 5 times

Thanks

Mark
Click to expand...
Hi,Mark.
Please confirm the BMS can cut off the charging when cells reach CHG_Limit.
Then please :
1.adjust the current first.
2.set CHG_Stop_current to 5000mA.
Please try discharging and charging again.
Click to expand...

Hi Eason
It never really gets as far as the chg_limit due to the first cell that hits the chg_recover and then that cell races up to the ov_limit
Another thing I've noticed is that it never reads that it's charging it just shows its in standby!!!!!

Will try the new chg_stop figure tonight

Thanks
Click to expand...

Oh...!!!!
I have known what happened!!!
Charging current has not been through the hall sensor!!!!
Please check the connection!
Let the positive wires of battery be through the hall sensor just follow the arrow.This is the PAK+.
Then + of charger will connect to this PAK+.
The purpose is to let charging current be through the hall.
When charging or discharging,pc&LCD will show "charging..."&"discharging" and its current!
 
ohzee said:
drewjet said:
Foundingpower, your BMS's are very interesting. Your website however, is difficult. I have a 21 series 6 Parallel A123 pack of 20AH cells(6 of the A123 Packs from Victpower), and may go up to 24S . I want a BMS for charging only, I do not want restrictions on Discharge, and would like to charge with up to 40 Amps. Which BMS does this, and how much is it, and how do I order?
Click to expand...

Going to agree with this post here. Still like the look of this BMS.
Click to expand...

I emailed Eason. It took several emails back and forth, but I did end up ordering the high current BMS capable of 24S and 40 amp charging. I hope to receieve it by next week and will report back here.
 
Hi Easson
I placed the hall sensor on the positive wire and no change!!!

Also changed the chg_stop to 5000ma

I think it's something to do with the hall sensor because the system information always shows its in standby while it charges and shows no current.

If I move or hold the hall sensor hard against the wire the oled display flashes and shows some amps flowing and the system information briefly changes from standby to discharging (haven't seen it show charging).

It only shows this if I hold the hall sensor and the wire, if I try and jam the wire in the hall sensor nothing registers

Cheers

Mark
 
UPDATE:
If I pass the positive wire of charger through the hall and the positive pak wire it shows me it's charging and the current,

Is this what you wanted me to do Easson? I read it that I was to just pass the + pak wire through the sensor (this shows nothing but standby and no current)

Will need to discharge the pack again and try it tomorrow.
 
mark133 said:
UPDATE:
If I pass the positive wire of charger through the hall and the positive pak wire it shows me it's charging and the current,

Is this what you wanted me to do Easson? I read it that I was to just pass the + pak wire through the sensor (this shows nothing but standby and no current)

Will need to discharge the pack again and try it tomorrow.
Click to expand...
Hi,Mark,
Please look at the structure diagram carefully in the middle of this link.
http://www.foundingpower.com/en/Products/Smart_BMS/2012081492.html
Discharging current circuit: BAT+-----PAK+----PAK- -----Hall sensor-----BAT-
Charging current circuit: PAK+(Load+ or Charger+) -----BAT(+-)------Hall sensor-----BMS-----CHG-(Charger-)
Your problem is hall sensor is out of charging circuit, hall sensor can not monitor the charging current so that BMS shows "standby" and can not cut off ,cells will be over voltage.
Please check your connection again.
 
FoundingPower said:
mark133 said:
UPDATE:
If I pass the positive wire of charger through the hall and the positive pak wire it shows me it's charging and the current,

Is this what you wanted me to do Easson? I read it that I was to just pass the + pak wire through the sensor (this shows nothing but standby and no current)

Will need to discharge the pack again and try it tomorrow.
Click to expand...
Hi,Mark,
Please look at the structure diagram carefully in the middle of this link.
http://www.foundingpower.com/en/Products/Smart_BMS/2012081492.html
Discharging current circuit: BAT+-----PAK+----PAK- -----Hall sensor-----BAT- (discharging current will not be through BMS,so no discharging current limit.)
Charging current circuit: PAK+(Load+ or Charger+) -----BAT(+-)------Hall sensor-----BMS-----CHG-(Charger-)
Your problem is hall sensor is out of charging circuit, hall sensor can not monitor the charging current so that BMS shows "standby" and can not cut off ,cells will be over voltage.
Please check your connection again.
Click to expand...
 
I'm don't know what's wrong then!!!!

When I wire the hall sensor on the -pak (as per diagram) I just get standby all the time.

The above is true when I put the hall sensor on the +pak wire aswell

Don't know what to do!!!!!!

I need to get someone to do a sanity check on my battery back build just in case I've missed something.
 
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