Re: LEAD ACID BATTERY


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.

Thanks
Regards
John

Why dont you use 2 12 volt batteries, or rather 4 12 instead of 6 6volt.
Then use regulators to set your output to 18 + & -. If then your batt volts
drop a little, you still have some to spare. Would be cheaper that way
also.
Use the ldo still regulator or low power switching regulators to improve
efficiancy. Jim..


.

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