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Serious lead-acid battery charger

Orefat

Jul 22, 2012
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Jul 22, 2012
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Hello everybody!

I'm planning to build a serious 220V 50Hz to 28V 15A(min.) smart charger for lead-acid batteries.
And, to be frank, I have no idea where to start. I would appreciate any suggestions on this topic.
Smart term in this case means that the voltage will fluctuate, from 28V (which will be constant voltage potential if battery is good) to 32V (if battery is "dead" and the charger will rise voltage to this point to try to revive the battery).
The current source and drivers should be SMPS but, as mentioned, with approach to soar the voltage.
So, what PSU type you recommend, which SMPS controllers, flyback, transformers, MOSFETs, IGBTs, maybe a MCU based psu?
Thanks in advance.
 

davenn

Moderator
Sep 5, 2009
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didn't know they made 28V lead acid batteries ??
 

dorke

Jun 20, 2015
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Do you mean two 12v in series?
Either way, this project would be far too complex if you don't know where to start.
Better to buy one.

Martin
Probably a large truck battery.

@Orefat ,
It isn't the simplest of projects out there,
why won't you use a commercial one?
 

Orefat

Jul 22, 2012
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Jul 22, 2012
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I bought a commercial one, but making one is such a challenge, isn't it?
Btw, the batteries are from Karcher battery-powered scrubber drier (1.2V per cell).
 

BobK

Jan 5, 2010
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I have never heard of lead acid batteries with1.2V per cell, they are normally 2.0V per cell. This sounds more like NiCad or NiMH.

Bob
 

Colin Mitchell

Aug 31, 2014
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"smart charger for lead-acid batteries" needs a smart design-engineer with 4 years experience.
 
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