Peakfoto Digital Photo Still n Video wrote:
I have a an ev scooter, with 22 lfp cells. I'm using min bms board
and evpower cell moduals and an aq Cycle anlyist.
BUT it'd be nice to have a some kind of an setable audble alarm ,
while driving if a/any cells get below a set point. so I can know
"the end getting close " not " you better stop NOW!" .
I kinda know about CELL logs , but sound s a alttle messy. I don't
need a screen on the dash. any reasobale ideas?
If you already have a BMS, doesn't it have an undervoltage alarm?
You don't *have* to monitor every cell to know if one is undervoltage.
If you want something very cheap and simple, try my Batt-Bridge. It
splits the pack into two halves, and compares the voltage of each half.
If they are different, some cell has just went dead, and is at a lower
voltage.
The Batt-Bridge normally lights an LED. But you can use the LED of an
optocoupler, and have the output of the optocoupler turn on a buzzer or
other more noticeable indicator.
The Batt-Bridge is described more fully at:
http://www.sunrise-ev.com/LeesEVs.htm#battbridge
--
If you're not stubborn, you'll give up on experiments too soon.
And if you're not flexible, you'll pound your head against the wall
and you won't see a different solution to a problem you're trying
to solve. -- Jeff Bezos
--
Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm
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