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Old 28-08-2013, 07:38   #1
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Battery equalization

Just did a equalization on my house bank wet cells for the first time. I have 3 group 27, 12 volt total of around 280 amp hrs. I bought a portable charger from Worst Marine that does equalization. I hooked the positive to one side of the bank and the negative on the other side of the bank instead of isolating each battery and equalizing individually. The charger went to 15.4-15.6 and I ran it for little over 4 hours. Cells bubbled a bit but nothing spectacular. Is this a normal equalization? I didn't have to add water. My bank is 7 year old Interstates.
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Old 28-08-2013, 07:41   #2
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Re: Battery equalization

That's normal.
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Old 28-08-2013, 07:45   #3
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Re: Battery equalization

Can you find a website by the battery manufacturer, or contact them? The equalization voltage can be provided by them, as well as the target specific gravity for each cell. They always suggest taking all the SG readings at the start, then after each attempt at equalization. These readings, with some minor guidance from them will provide you with the measurement of success you need.

Typically, the size of the range of SG between cells tells you when to equalize, and when you've done a good job of it. The target SG and target range varies a little between manufacturer. If you can't get what you want from the manufacturer, surf other manufacturers' websites.
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Old 29-08-2013, 16:21   #4
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Re: Battery equalization

The end point for an equalization is when all the cell specific gravities are within one or two points of each other and the readings have stabilized. This process usually takes significantly longer than four hours.
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Old 30-08-2013, 05:50   #5
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Re: Battery equalization

Any idea how long it should take? First time I did it.
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Old 30-08-2013, 06:34   #6
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Re: Battery equalization

Quote:
Originally Posted by bmm32005 View Post
Any idea how long it should take? First time I did it.
Until the SG in each cell is in as good a balance as you can get. When the SG stops changing/improving there is not usually much more gain to be seen....

The current going into the batteries at 15.5V can also be a good indicator but unless you have a baseline on those batts, at 15.5v before they sulfated, then it will be tough to guess at and SG will be best...
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Old 30-08-2013, 15:36   #7
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Re: Battery equalization

It took me over twelve hours with 1320Ahrs of golf cart batteries!

You should only equalize after the battery bank is fully charged initially. You than take SG readings of each cell and record them every 1/2 hour. When they stabilize, you are done.
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