BATTERIES AND AMP/HOURS

5 Posts
Jun 26, 2007 11:23 pm
BATTERIES AND AMP/HOURS

I HAVE TWO BATTERY BANKS OF 12 VOLTS EACH, THE TWO BANKS ARE MADE UP OF 6 X 2 VOLT BATTERIES EACH. SO THERE IS A TOTAL OF 12 BATTERIES, EACH BEING 2 VOLTS.
EACH BATTERY HAS A STICKER ON IT THAT SAYS: "8 HOUR CAPACITY 720 AH."
WHAT IS THE AMP/HOUR CAPACITY OF THE BATTERY BANKS?

ALSO: LATELY I HAVE NOTICED THAT MY INVERTER/CHARGER DOES NOT CHARGE THE BATTERIES TO THE SAME VOLTAGE AS IT ONCE DID, IT USE TO CHARGE THE BATTERIES TO 14.6 VOLTS AND EQUALIZE TO OVER 15 VOLTS, BUT NOW IT DOESN'T SEAM TO CHARGE THEM PAST 13.6 VOLTS EVEN THOUGH THE BATTERIES GET TO 100% THE VOLTAGE WONT GO TO THE BULK SETTING ANYMORE.
           ANY IDEAS?
 
18 Posts
Jun 26, 2007 11:50 pm
Re: BATTERIES AND AMP/HOURS

Murray

I can help with the AH capacity but not the inverter/charger.

You are correct in wiring up the 6 batteries in series for your 12V, which means that your AH capacity won't change. The 8 Hr capacity of 720 AH means that if you completely discharged the battery over an 8 hour period, it would deliver 720 AH's, then it would have nothing left to give. Now, if you were to discharge them at a faster rate, you would get less than 720 AH, and if you discharged them slower than 8 hrs, you would get more than 720 AH.

Just a reminder that when stringing together batteries, you either add voltage or amperage, not both at the same time. So you correctly ran the 6 batteries in series for your 12V, which meant that your AH capacity didn't change. And of course the flip-side would be that you wired the batteries in parallel to have 2V with 6 X 720 AH of capacity. Also, remember that when you multiply your voltage times your amperage, you get your wattage. So 12V times 720 AH is about 8640 Watt Hours of storage, and a tag along with that is to remember to try to never consistently drain the batteries below 50% capacity. So don't use more than 4.32 KWh's of energy.

I hope this has helped. And again, I am not sure about the inverter/charger. Someone else to lend some advice? 

Have a nice day, Ian
« Last Edit: Jun 27, 2007 12:16 am by Ian Williams »
 
5 Posts
Jun 27, 2007 09:27 am
Re: BATTERIES AND AMP/HOURS

IAN,
 THANKS FOR THE ADVICE. DOES THIS MEAN THAT BECAUSE I HAVE TWO BANKS OF THESE BATTERIES THAT I HAVE TWICE THE AMP/HOURS? IN MY CASE I HAVE CREATED TWO BANKS OF 6 X 2VOLTS. SO DOES THAT MEAN THERE IS 2 X 720AH OR 1440 AMP/HOURS?
 
18 Posts
Jun 27, 2007 12:33 pm
Re: BATTERIES AND AMP/HOURS

Murray,

Yes it does mean that you have 1440 AH of storage after you ran both banks in parallel for a total of 1440 AH @ 12V.

Ian
 

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