19th January 2007 03:40 PM
Lead Acid battery charger
I am building a Lead acid battery charger for my project. I have a power converter that converts 110V to 12V, 5V and 3V. I am using 12V to run my project and i want to build a back-up power so I bought a Lead acid battery and now i m trying to build a charger. MY Idea is to run 12v from the power inverter and if that fails using diodes Lead acid battery will take over.
NOw i know that my Lead acid battery will produce about 12.4V so i had to bring my 12V from power converter to 13.8v so my project keeps running on that and not on battery.
so need help building charger from using 13.8V from power converter to charge a 12V battery with 7A. my input is 13.8V and i need to charger 12V lead acid battery with 7A.
Thank You All
19th January 2007 05:17 PM
there are some very recent postings regarding sealed lead acid, 'floating'
chargers. Do a forum search.
If you cannot find the postings, let us know, someone will guide you.
20th January 2007 06:26 PM
Why are you converting 13.8V (which would be perfect for float charging a lead acid battery) to 12V (which won't be enough to charge a lead acid battery)?
20th January 2007 11:48 PM
You don't need 7 amps to charge the battery, it will be floating most of the time. I looks to me that you can just connect the 13.8 volt source to the battery. I assume that is why you chose that voltage.
29th January 2008 04:57 PM
Hiya, try my circuit out. Despite the fact I am having problems with it at the moment, it has been operating for 8 years or so.
29th January 2008 05:17 PM
23rd March 2011 01:24 PM
so a 3A charger can charge a 75AH 12VDC LA battery
Originally Posted by Russlk
23rd June 2011 09:07 AM
How much amps are required to fully charged two 12v 150AH deep cycle lead acid batteries connected in series (24V)
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