24s LiFePO BMS...cell_man or BMSBattery?

[Chucked]

Hi,

I am going to be building my own LiFePO4 battery pack using cells from my work, but I am looking for the best inexpensive BMS for my setup.

I am going to be using 24 cells in series, and the cells have a 17Ah capacity and a 6C discharge capability and 2C charge. I will be using a 15FET 45A controller powering an oil cooled 9c clone from Cell man.

I have so far only found two BMS systems that i am considering and would like some of your expert opinions regarding which one is better and also which one is easier to implement.

There is this one from BMSbattery for 95$ +shipping
http://www.bmsbattery.com/bmspcm/378-17s26s-24a-max-discharge-current-bms.html

and there is this one from cell_man which is 120$ but likely free shipping as i would be bundeling it with my motor kit purchase
http://209.200.244.139/~emiss1/store/index.php?route=product/product&path=42&product_id=70

I think that one day down the road i may want to mod my controller and boost power to ~60A, so the cell man bms might be more future-proof.

what are your experiences with these BMS?
are there other ones that are similarily priced that I should be considering?

PS: I plan on using this charger unless I am told that there is better out there for similar price
http://www.bmsbattery.com/alloy-she...po4li-ionlead-acid-battery-ebike-charger.html

Thanks for the help!

 

[dnmun]

that website with the headway BMS is paul's? the picture that comes up is the headway 16S BMS. they are the best. the BMS battery BMS is an unknown for me.

the BMS battery guys posted up misinformation about the charger too. you do not wanna charge the lipo to 4.2V and the lifepo4 has to be charged to 3.65V minimum to get the BMS to balance the pack. the headway BMS is the only one that can balance a lifepo4 pack with minimal overhead voltage. for 24S you wanna have the charger put out 89V.

they have a bad reputation too. but cheap.

 

[Chucked]

Yea, i have been in contact with Paul (cell_man) regarding my kit and he sent me to that website, I had been using his emission-free site, but it seems like this is the one he is now using.
the picture on the link i put is the 16S, but if you click on it you can see two others, one of which i beleive shows the 24S unit (third one from left?)

that website here says that charge voltage should be 87.6V what do you think? 87.6 or 89V?

 

[Chucked]

Hi,

I am going to be building my own LiFePO4 battery pack using cells from my work, but I am looking for the best inexpensive BMS for my setup.

I am going to be using 24 cells in series, and the cells have a 17Ah capacity and a 6C discharge capability and 2C charge. I will be using a 15FET 45A controller powering an oil cooled 9c clone from Cell man.

I have so far only found two BMS systems that i am considering and would like some of your expert opinions regarding which one is better and also which one is easier to implement.

There is this one from BMSbattery for 95$ +shipping
http://www.bmsbattery.com/bmspcm/378-17s26s-24a-max-discharge-current-bms.html

and there is this one from cell_man which is 120$ but likely free shipping as i would be bundling it with my motor kit purchase
http://209.200.244.139/~emiss1/store/index.php?route=product/product&path=42&product_id=70

I think that one day down the road i may want to mod my controller and boost power to ~60A, so the cell man bms might be more future-proof.

what are your experiences with these BMS?
are there other ones that are similarily priced that I should be considering?

PS: I plan on using this charger unless I am told that there is better out there for similar price
http://www.bmsbattery.com/alloy-she...po4li-ionlead-acid-battery-ebike-charger.html

Thanks for the help!

PPS: i orifginally posted this in the technical section, but upon second though i concluded that this may be more appropriate and/or would get better/more responses here.

 

[agniusm]

How about founding power bms with no output limit, programable with oled for around 100 usd?

 

[999zip999]

What cells Pic or something.

 

[Chucked]

The cells are rectangular aluminum casing manufactured by Lishen for Coda Automotive.

i am quite intrigued by that BMS from founding power, but you claim that it is not current limited yet the site seems to say that it is rated for 40A with a 50A max and a 100A peak (btw how long is usually considered a peak? 5 seconds?30?60?100?)

http://www.foundingpower.com/en/Products/Smart_BMS/2012042353.html

also, where would I buy it? theres no price on the website?
theres a phone number but i think its in shangai so ill have to skype call them from home.

Thanks for this find, this could be a BIG improvement!

 

[FoundingPower]

The cells are rectangular aluminum casing manufactured by Lishen for Coda Automotive.

i am quite intrigued by that BMS from founding power, but you claim that it is not current limited yet the site seems to say that it is rated for 40A with a 50A max and a 100A peak (btw how long is usually considered a peak? 5 seconds?30?60?100?)

http://www.foundingpower.com/en/Products/Smart_BMS/2012042353.html

also, where would I buy it? theres no price on the website?
theres a phone number but i think its in shangai so ill have to skype call them from home.

Thanks for this find, this could be a BIG improvement!

Hi,
http://www.foundingpower.com/en/Products/Smart_BMS/2012081492.html
This BMS is no discharging current limit with lcd/oled and program as Agniusm said.

 

[zappy]

Hi we set up a "100amp" BMS brand 24s bms with A123 20ah cells and it was bloody huge! as big as the 24 fet controller, which is letter box size, it had large chassis fets, big shunts etc and we thought this might actually last. It took longer than agreed, came with no wiring diagram etc slow response from vendor. "Pickle" got it all going at 8kw into a cro motor down hill bike. It went for a few days than literately shat the bed! there was melted solder, lifted traces and black stuff every where.
We ordered one from cell man it was a 1/4 the size, had a wiring diagram and showed up in a week it was a little more expensive but its still going (1200km) at 5400w. We did turn down the charger to 10 amps in.
Hope this helps
Zappy