T-Pain Is On A Boat: [Electric Boats] Re: BMS and charger for Sky Energy Pack

Wednesday, June 17, 2009

[Electric Boats] Re: BMS and charger for Sky Energy Pack

Chris,

Did you mean overVOLTAGE protection or overCURRENT protection?

Overvoltage is easy to adjust with resistors. I recommend NOT the adjustable ones, though you could use those to "dial in" the best resistance for a 3.6v max, then replace the dialed varistor with precise or combined-to-be-precise fixed resistors. The adjustable resistors may float over time (and corrosion) and crap out your cool batteries.

OverCURRENT is beyond me.

I love BatterySpace.com... great prices, products, speedy delivery.

Mark Stafford

--- In electricboats@yahoogroups.com, cwitzgal <chris@...> wrote:
>
> Hi all;
>
> I have ordered eight, 40ah Sky Energy Cells, LIFEPO4, to power my Torqueedo
> 801 motor. This is used on our tender to Jubilee, or Westerly Fulmar.
>
> The pack will be configured as 24v. The cells have a fully charged voltage
> of 3.6v, and a lov voltage of 2.0v. I need to find a BMS and charger for the
> pack, and I am having difficulties.
>
> Here are the cells:
> http://www.evcomponents.com/ProductDetails.asp?ProductCode=SE40AHA
>
> Here is a BMS board:
> http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2480
> The trouble I think with that board is that the over current protection is
> set to 3.9 volts, and the Sky Energy cells look like they are to be charged
> to 3.6v max.
>
> Am I correct in this assumption?
> Any other sources for a good board to serve as a BMS? Ideally, it would
> allow a simple power supply to provide the juice for charging, incorporating
> all bms and charging intelligence.
>
> Chris
>
>
> [Non-text portions of this message have been removed]
>