foundingpower programmable bms

Is the daisy chained version available yet.
Need 36S Thanks
 
I have some pics of this beasty out of its case. This is the CS-BMS

Looks like its using a pair of LTC6803G-3 chips for control.
The three charge current interrupting mosfets are IRFB3307Z N channel.

The bleed resistors are 39 ohm. Should net around 106ma of bleed current at 4.15v

20130401_100757_zps7c00d412.jpg


20130401_100715_zps236d3952.jpg


20130401_100558_zps5b990269.jpg
 
Have a few more pics of the pack after I left it on the charger for an hour. If it would have been on for another half hour or so, the entire pack would be 4.09v. I sporadically checked the cells with my fluke, and what the BMS was calling 4.09 varied between 4.0912v and 4.0895v. Pretty good.
Here are some shots:

20130401_123712_zps09403d54.jpg


20130401_123737_zps75df1c43.jpg


20130401_123741_zps4037ab87.jpg


20130401_123745_zps92f0f2fd.jpg
 
Farfle said:
I have some pics of this beasty out of its case. This is the CS-BMS

Looks like its using a pair of LTC6803G-3 chips for control.
The three charge current interrupting mosfets are IRFB3307Z N channel.

The bleed resistors are 39 ohm. Should net around 106ma of bleed current at 4.15v
Click to expand...

You are the expert :D
But you must notice that do not let the total voltage of pack be over 100v,or power supply chip on bms will probably burn.
set value of CHG limit to 4150mv,CHG recover to 3950mv,OV to 4200mv.
 
FoundingPower said:
megacycle said:
Is the daisy chained version available yet.
Need 36S Thanks
Click to expand...
Not yet.
We are ready to use newer LTC6804 chips for daisy chained version.
Click to expand...

8) Do you have an ETA on that.
 
So what is the plan for placement on the bike? I'm trying to figure out where I can put this. The display makes this a must have in my opinion!

Tom
 
Hi,

I wanted to put images but I see that it it already done, so no more needed. I have so much work at this moment...
In order to use a bluetooth RS232 converter I added a 5v wire to the pin 9 of the DB9 connector. I use this converter: http://dx.com/p/db9-rs232-wireless-bluetooth-serial-module-104301

I've still not installed it and this week-end I go skiing...
 
romelec said:
Hi,

I wanted to put images but I see that it it already done, so no more needed. I have so much work at this moment...
In order to use a bluetooth RS232 converter I added a 5v wire to the pin 9 of the DB9 connector. I use this converter: http://dx.com/p/db9-rs232-wireless-bluetooth-serial-module-104301

I've still not installed it and this week-end I go skiing...
Click to expand...

Do you know what the serial data looks like? Raw data stream, formatted, etc.?
 
Eason, have a question for you. i have managed to finish my 24S pack and connected your BMS in this sequoence: balance connector No.1 then balance connector No.2 then pack's negative to BMS then pack's positive to charger. Yesterday all was OK, although weird, displaying discharge at 18A when there was no load?!:
[youtube]BVld53jco7A[/youtube]
Today i have connected BMS with same sequence as above to continue balancing and few resistors vaporized without no reason:
20130514_103827

i mean there should be a reason for that, but i dont see why it worked the first time and went in smokes the second
 
in the failures of a new BMS where the shunt resistor was smoked, i found that the sense wires were not connected in sequential order and the channel on the BMS was either reversed or had a much higher voltage on it than the transistor could handle.

you should walk the voltmeter up the sense wire plug verifying that each pin is sequentially one cell voltage higher than the previous.
 
dnmun said:
in the failures of a new BMS where the shunt resistor was smoked, i found that the sense wires were not connected in sequential order and the channel on the BMS was either reversed or had a much higher voltage on it than the transistor could handle.

you should walk the voltmeter up the sense wire plug verifying that each pin is sequentially one cell voltage higher than the previous.
Click to expand...

..and that i do each time on sense wires connecting new BMS. Check sequential increments, check each cell voltage on sense plugs. It worked the first time, all plugs are numbered, no confusion there.
 
are the resistors burned open now and can you measure the voltage drop across them?

i guess the shunt transistors are on the underside but that much current may be too much for them if they are surface mount. they may be shorted now.

are they 20 ohm 2W resistors?
 
dnmun said:
are the resistors burned open now and can you measure the voltage drop across them?

i guess the shunt transistors are on the underside but that much current may be too much for them if they are surface mount. they may be shorted now.

are they 20 ohm 2W resistors?
Click to expand...

i really cant tell what they are at the moment. Will check that and get back. i dont think transistors were damaged, at least by the smell. There are few SMD resistor burned as well, 101 is the marking. Will buy a bunch of both to replace

P.S. looking by the colors (orange, white, black, golden, brown) the resistor is 39Ohm +/-1%, by the looks .5W. The small ones are 100Ohm (101)
http://www.ebay.co.uk/itm/1-2W-Watts-39-Ohm-1-Metal-Film-Resistors-Bag-500-/290912889723
 
Hello,
yesterday i installed the BMS on a 24s 5000mAh test rig and the software and balancing worked slow, but it is working. Then i tried to discharge the cell (all about 4.1 Volts) with 2 Ampere to a big resistor. Unfortunately i did not get any reading of the Hall sensor (400A model). I tried both direction of the negative cable through the hall sensor. Are 2A to low for the hall sensor or is the thin cable a problem.
I installed in the following way: Batt- ... Hall Sensor (against arrow direction)....big resistor (load); Load+... Batt+
Is it necessary to adjust the Hall sensor? I have centre voltage and and current adjust still empty (no value).
Thanks for the help.
Martin
 
mj2412 said:
... Are 2A to low for the hall sensor ...
Click to expand...
Yes, 2A is probably too low - there is a threshold of 2-4A below which current is indicated as 0. I don't know the reason, probably the AD converter operates at 8bits...
Yes, you must calibrate the current sensor i.e. feed a large enough current (I use ca. 20A, more would be better for accuracy)...

If you use e.g. this CS-BMS with an external current sensor (CS) you could coil the cable with the calibration current e.g. 10x through the CS orifice (10x2A=20A)...

Eason, hi, it would be helpful to let us know at which threshold currents the software decides it's mode i.e. idle(standby), charging and discharging and what is the timing/condition for sleeping/waking mode. It would also help to know the precision of the current measurement i.e. including the AD convertor bit resolution, as this gives us a better grip on what SOC measurement performs.

rolf
 
Got my BMS up and running, (its up by the headtube). So far its working well!

FB_IMG_13694169687000953_zpsf057e150.jpg
 
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