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How to Build a Fast Charger for Car Lead Acid Battery?

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kengloong

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I'm now using a car lead acid battery in my UPS System, now almost a week already my battery still not fully charged yet.

So, I planned to build a fast charger in my UPS, any someone can give me some idea how to build it?

Regards,
Keng Loong, Liew
 

echo47

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A typical safe charge rate is 0.1 times the battery's capacity, so it takes about half a day to charge it. If it's a 60 ampere-hour 12V battery, then your charging supply should output about 13.8V and limited to 6 amps.

You can apply several times that much current for quicker charge, but refer to the battery data sheet for reliability info.
 

kengloong

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What is the formula to calculate this charging time? Any circuit that you can provide to myself that I can build up the fast charger for my UPS.

Can anybody advice that to build up another fast charger to attach to the UPS so that I no need to modify the UPS original circuit?

Please advice, Thanks!
 

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