M
mike
Temperature Coefficient of Lead-Acid Battery??
My friend asked me to design a diversion controller
for a solar/wind powered mountain top radio repeater site.
There's a lot of conflicting info published on the web,
but the consensus from alt.homepower appears to be
~-3mv/cell/degree C.
I don't have access to the actual GelCell batteries involved. And
there's no vendor name that can be contacted. So, I did the
next best (worst) thing and stuck a 12V sealed lead acid
battery of the type used in alarm systems and UPSs in the
fridge. For a delta of 30F/16.66C I saw 40mV of change
in open circuit volts. 18mV/degreeC predicts 300mV.
This discrepancy is too much even for a seatofthepants
guy like me.
What am I doin' wrong?? Anybody got any first-hand experience
with battery tempco?
Thanks, mike
--
Return address is VALID.
Bunch of stuff For Sale and Wanted at the link below.
Toshiba & Compaq LiIon Batteries, Test Equipment
Honda CB-125S $800 in PDX
Yaesu FTV901R Transverter, 30pS pulser
Tektronix Concept Books, spot welding head...
http://www.geocities.com/SiliconValley/Monitor/4710/
My friend asked me to design a diversion controller
for a solar/wind powered mountain top radio repeater site.
There's a lot of conflicting info published on the web,
but the consensus from alt.homepower appears to be
~-3mv/cell/degree C.
I don't have access to the actual GelCell batteries involved. And
there's no vendor name that can be contacted. So, I did the
next best (worst) thing and stuck a 12V sealed lead acid
battery of the type used in alarm systems and UPSs in the
fridge. For a delta of 30F/16.66C I saw 40mV of change
in open circuit volts. 18mV/degreeC predicts 300mV.
This discrepancy is too much even for a seatofthepants
guy like me.
What am I doin' wrong?? Anybody got any first-hand experience
with battery tempco?
Thanks, mike
--
Return address is VALID.
Bunch of stuff For Sale and Wanted at the link below.
Toshiba & Compaq LiIon Batteries, Test Equipment
Honda CB-125S $800 in PDX
Yaesu FTV901R Transverter, 30pS pulser
Tektronix Concept Books, spot welding head...
http://www.geocities.com/SiliconValley/Monitor/4710/