Re: LEAD ACID BATTERY

On Wed, 29 Mar 2006 10:50:17 -0800, john wrote:

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.

You'd have to either ask the battery manufacturer for their discharge
curves, or get one and try it with a 700 mA load - about 8.5V ohms, at
least 10 watts, a meter, and a clock. :-)

Good Luck!
Rich

.

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