On 04/16/2014 01:41 AM, 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?
The "stop now" alarm (~2.5v?) can be considered "stop now" when it goes
off with little to no current. It can be considered a "you're getting
near the end" alarm when it goes off with moderate current. I think my
experience will scale to your smaller vehicle and smaller pack: I have
48 260ah cells that give me ~150 miles. Normal max currents are around
500 amps. I believe I have my controller set to pull no more than 800
amps. In warm weather (50+ deg), it does not alarm; down around 30 deg,
it might alarm at 200-300 amps. When I get within about 10 miles of the
end, the alarm will go off at ever decreasing currents. When I think
I'm within a few miles of the end, I will periodically test by demanding
more current. When it alarms at 300 amps, I can guess I have at least 5
miles left. It is my understanding that these low voltage events under
current draw do no cell damage.
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