36 LiFePO4 cells with a 120V controller - ElMoto.net

__Tango · 11-13-2009

So, i have a bike (YAY! ... finally...phew.), and i have batteries on order (YAY!). I was just about to order the controller (YAY!), but got scared before i clicked on "order" (BOO!).

The proposed specs so far are: Enertrac brushless hub motor, 36 TS cells (115.2V nominal, 133.2V fully charged), a Kelly KBL controller. I was planning on using the 120V/400A version (KBL12401I) since my nominal voltage is <120V, and Mark from Enertrac recommends the 400A controller based on his experience. However, will the full charge of 133.2V be too much for the controller?

I understand that the 3.7V/cell is supposed to burn off pretty quickly to 3.2-3.3V/cell, however will i be screwed from the get-go on a full charge?

Thanks!

...tango...

remotecontact · 11-13-2009

Why don't you just get a 144v controller :

http://www.newkellycontroller.com/pr...38e5e655d16e6d

remotecontact · 11-13-2009

Still waiting on bike pics btw

frodus · 11-13-2009

From here: http://www.newkellycontroller.com/pr...roducts_id=213

Quote:

Operating Voltage, B+, 18V to 1.25*Nominal Voltage for controller rated equal or higher than 36V. 8V to 30V for controller rated equal 24V.

120V * 1.25 = 150V

Sounds like you're fine.

__Tango · 11-13-2009

Quote:

Originally Posted by frodus

From here: http://www.newkellycontroller.com/pr...roducts_id=213

120V * 1.25 = 150V

Sounds like you're fine.

Ahhh...missed that.

Controller is now ordered! Woohoo!

Thanks!

...tango...

frodus · 11-13-2009

and if it blows, well, its in their spec, they owe you a free upgrade

screenshot/save the page or confirm the manual reflects the same overage (1.25).

gasfreeearth · 11-13-2009

Quote:

Originally Posted by __Tango

Ahhh...missed that.

Controller is now ordered! Woohoo!

Thanks!

...tango...

Great Tango!

Now get to reading.

http://www.newkellycontroller.com/mo...UserManual.pdf

By the time it gets there you'll know exactly what to do.

__Tango · 11-14-2009

Quote:

Originally Posted by gasfreeearth

Great Tango!

Now get to reading.

http://www.newkellycontroller.com/mo...UserManual.pdf

By the time it gets there you'll know exactly what to do.

HA! I've had that PDF for weeks...and i'm sure i'll still be confused about a million things.

...tango...

__Tango · 11-14-2009

Just a note, before i asked the sagely advice here, i emailed kelly about it, and here's their response (just for corroboration):

Quote:

Originally Posted by Fany from Kelly Controllers

Quote:

Originally Posted by __Tango, in email

Hello,

I am planning on using 36 Thundersky LiFePO4 batteries with a brushless motor. The nominal voltage is 115.2V, however with a fully charged pack (3.7V per cell), that works out to 133V.

I understand that the cells go from 3.7V to 3.2V very quickly (a surface charge that comes off of the cells very quickly). I would like ues a 400A controller, so I would like to know if i can use the 120V controller (KBL12401I), or if i must use the 144V controller (KBL14401I)?

Obviously, i would rather use the 120V controller since the cost is $300 USD cheaper, and since the charge over 120V burns off so fast. However, i thought i'd ask you first.

No problem,the controller KBL12401I can operate with 18V-136V voltage.
So the batteries are available.

Thanks,
Fany

frodus · 11-14-2009

but their spec says 1.25 times the controller voltage..... so is it 136? or 150?

11-13-2009	#1
__Tango Senior Member El Moto Senior Member Join Date: Aug 2009 Location: Mountain View, CA Posts: 389	36 LiFePO4 cells with a 120V controller So, i have a bike (YAY! ... finally...phew.), and i have batteries on order (YAY!). I was just about to order the controller (YAY!), but got scared before i clicked on "order" (BOO!). The proposed specs so far are: Enertrac brushless hub motor, 36 TS cells (115.2V nominal, 133.2V fully charged), a Kelly KBL controller. I was planning on using the 120V/400A version (KBL12401I) since my nominal voltage is <120V, and Mark from Enertrac recommends the 400A controller based on his experience. However, will the full charge of 133.2V be too much for the controller? I understand that the 3.7V/cell is supposed to burn off pretty quickly to 3.2-3.3V/cell, however will i be screwed from the get-go on a full charge? Thanks! ...tango...

11-13-2009	#2
remotecontact Senior Member El Moto Senior Member Join Date: Jul 2009 Location: Miami, FL Posts: 399	Why don't you just get a 144v controller : http://www.newkellycontroller.com/pr...38e5e655d16e6d __________________ “I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything.” - Tesla

11-13-2009	#3
remotecontact Senior Member El Moto Senior Member Join Date: Jul 2009 Location: Miami, FL Posts: 399	Still waiting on bike pics btw __________________ “I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything.” - Tesla

11-13-2009	#6
frodus Consultant El Moto Senior Member Join Date: Mar 2008 Location: Portland, OR Posts: 2,891 Blog Entries: 5	and if it blows, well, its in their spec, they owe you a free upgrade screenshot/save the page or confirm the manual reflects the same overage (1.25). __________________ (click image to go to the eVFR website) ---------------------------------------------------- Travis Gintz

11-14-2009	#10
frodus Consultant El Moto Senior Member Join Date: Mar 2008 Location: Portland, OR Posts: 2,891 Blog Entries: 5	but their spec says 1.25 times the controller voltage..... so is it 136? or 150? __________________ (click image to go to the eVFR website) ---------------------------------------------------- Travis Gintz

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