Re: LEAD ACID BATTERY

"john" <conphiloso@xxxxxxxxxxx> wrote in message
news:1143658217.176256.26890@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi,

I have to design a voltage source ( +/- 18volts, 13A ) using lead acid
batteries. My circuit draw is 700mA and requires plus minus 18 volts to
operate efficiently. I need batteries that can atleast run for 10 to 12
hours before the voltage drops to +/- 17 volts. I am thinking of adding
three 6 volts, 13AH ( rated for 20AH ) batteries in series to produce
+18 volts and adding three 6 volts to generate -18 volts. I choose the
battery ( BP13-6V ), http://www.zbattery.com/zbattery/ub13-6.html.

Can anybody advice me that am I doing the right thing that will these
six batteries last for 10 to 12 hours maintaining +/- 18 volts @
600mA.

It looks as though these batteries are good for at least
12 AH in the current range you're looking at:

http://www.powerstream.com/bb/bp13-6S.pdf

The discharge rate curves show them staying above 6.0V for
over 12 hours at a discharge rate of 650mA.

So you should be okay.


.

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