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General => Mr. Fix it => Topic started by: movein69 on May 25, 2006, 07:18 PM

Title: How long to charge battery?
Post by: movein69 on May 25, 2006, 07:18 PM
Ok, I thought I had the battery thing figured out. My lights used to work with no electricity, then they would dim, then I'd plug into electric for a while, then after I'd unplug, the lights would be great for a while.

Apparently, my battery was low really and the electricity helped charge it some. I left my refrig on 12v and the battery is now dead.

How long does it take to charge a battery using the battery charger?

My charger has a 2 amp low charge and a 6 amp high charge for 12v.

I am dumb when it comes to this, please help.
Title:
Post by: mike4947 on May 25, 2006, 07:26 PM
Well a group 24 battery when heavily discharged will need apx 50-60 amps to recharge it.
But the last 20% takes longer as the voltage in the battery is higher and there is less "push". Figure at least 24-48 hours to guarantee a full charge.
 
BUT, depending on your converter it could have a better built in charger that will supply higher amperage for a quicker recharge. As always check the water level before, and during the charge.
 
A must read for any one owning a battery:
 
http://www.ccis.com/home/mnemeth/12volt/12volt.htm (//%22http://www.ccis.com/home/mnemeth/12volt/12volt.htm%22)
 
http://www.ccis.com/home/mnemeth/12volt/12volta.htm (//%22http://www.ccis.com/home/mnemeth/12volt/12volta.htm%22)
Title:
Post by: movein69 on May 25, 2006, 07:46 PM
Quote from: mike4947Well a group 24 battery when heavily discharged will need apx 50-60 amps to recharge it.
But the last 20% takes longer as the voltage in the battery is higher and there is less "push". Figure at least 24-48 hours to guarantee a full charge.
 
BUT, depending on your converter it could have a better built in charger that will supply higher amperage for a quicker recharge. As always check the water level before, and during the charge.
 
A must read for any one owning a battery:
 
http://www.ccis.com/home/mnemeth/12volt/12volt.htm
 
http://www.ccis.com/home/mnemeth/12volt/12volta.htm


Ok, I will read your links, but my question is if it takes 50 - 60 amps and I just mentioned my charger having 2 am or 6 amp options, what does this mean to me?
Title:
Post by: mike4947 on May 26, 2006, 12:07 AM
It means in a perfect world it would take 60/2 or 60/6 hours to recharge. But since nothing is perfect it takes longer. figure 20% longer at least. But that depends on how discharged your battery is. The more the discharge, the more amps needed to recharge.
Title:
Post by: movein69 on May 26, 2006, 06:17 AM
Quote from: mike4947It means in a perfect world it would take 60/2 or 60/6 hours to recharge. But since nothing is perfect it takes longer. figure 20% longer at least. But that depends on how discharged your battery is. The more the discharge, the more amps needed to recharge.


Ok, so the 2 amp / 6 amp is the amps per hour charge then. Got it.

Thanks for your help.
Title:
Post by: mike4947 on May 26, 2006, 10:04 AM
As an aside, I have been critisized lately about always saying "amps per hour" by folks saying "that's redundant, everyone knows it amps per hour" So I stopped.
Thank you for actually not knowing that.
Some folks forget that not all of us were born knowing everything...note my signature.
Title:
Post by: movein69 on May 26, 2006, 01:17 PM
Quote from: mike4947As an aside, I have been critisized lately about always saying "amps per hour" by folks saying "that's redundant, everyone knows it amps per hour" So I stopped.
Thank you for actually not knowing that.
Some folks forget that not all of us were born knowing everything...note my signature.


Well you are correct. I had no clue. I am a newbie to popups but also know next to nothing about batteries or electricity.

I do not know how anyone who doesn't know about it would assume it was amps per hour.