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Old 09-09-2014, 11:10 AM   #1
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Question Quick Question On battery to Kilo Watt Hours

Just doing the math to for my Solar system.........

Want to make sure I did the formula correctly for a 24 volt Solar System....

The battery is a 460AH at 20 hours for 6 volt batteries

Formula:

6 volt battery X 480AH rating = 2880 Watt Hours.

Convert to Kilo watt hours:

2880 / 1000 = 2.88 KWH

4 Batteries @ 2.88 KWH each = total 11.52 KWH

is this correct?
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Old 09-09-2014, 01:21 PM   #2
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I'm a bit confused, so I might add more confusion than help so please bare with me.

Why are you looking at a 24V solar systems vs 12 volt? Maybe I just don't understand solar well enough, I am still using a Honda EU2K

I assume what you have is a (4) 6V battery bank arranged as (2) 6V in series, thus doubling the voltage but not the AH, and then wiring the two sets of series connected batteries in parrallel to double the AMP Hours.

So essentially what you will have is a battery bank constructed with (4) 6V cores but set up so your RV see basically (2) 12V batteries since you RV requires 12V not 24V --right?

In that case if each 6V core is ~230AH, you would end up with a total capacity of 460AH @ 12V.

12V*460AH = 5,520 Watt Hours = 5.52KW Hours.

Hopefully somebody better than I can correct me if I am wrong.

Your calulation to me looks like you are connecting (2) 6V cores in parrallel which would double AH, but leave you with only 6V which your RV can't opperate on.
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Old 09-09-2014, 03:10 PM   #3
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Quote:
Originally Posted by clubhouse View Post
I'm a bit confused, so I might add more confusion than help so please bare with me.

Why are you looking at a 24V solar systems vs 12 volt? Maybe I just don't understand solar well enough, I am still using a Honda EU2K

I assume what you have is a (4) 6V battery bank arranged as (2) 6V in series, thus doubling the voltage but not the AH, and then wiring the two sets of series connected batteries in parrallel to double the AMP Hours.

So essentially what you will have is a battery bank constructed with (4) 6V cores but set up so your RV see basically (2) 12V batteries since you RV requires 12V not 24V --right?

In that case if each 6V core is ~230AH, you would end up with a total capacity of 460AH @ 12V.

12V*460AH = 5,520 Watt Hours = 5.52KW Hours.

Hopefully somebody better than I can correct me if I am wrong.

Your calulation to me looks like you are connecting (2) 6V cores in parrallel which would double AH, but leave you with only 6V which your RV can't opperate on.
This is a 24 Volt Solar system to go 120 volts output system. I have no 12 volt appliances in my 5er. I live in my 5fer full time. I'm on a pole in a rv park. I have been doing alot of research the last 4 mos. and 12 volt solar systems are starting to go my the way side.

Here is some of my info:

4 - Rolls 480AH 20 Hour batteries Maint. Free. No Flooded Batteries! Approx $500 each.
http://rollsbattery.com/public/specsheets/spec_74.pdf

4 - LG NanoX Solar Panels 300 watts each. Approx. $500 each
http://www.lg.com/us/commercial/sola...lg-LG300N1C-B3

1 -Magnum 4000 watt Inverter Approx. $2,000
http://www.wholesalesolar.com/produc...m_ms_4024.html

1 - Xantrex 60 amp Solar MPPT Charge Controller Approx. $500
http://www.ecodirect.com/Xantrex-865...mppt60-150.htm

All I am trying to do is figure out the math for a 120 volt 500 Watt device.
With the setup I am thinking to buy I can approx. Run a 1000 watt device for
approx. 4 to 6 hours.

Here is a example: ( keep in mind my Rolls batteries are 460AH not 100AH



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Old 09-09-2014, 05:56 PM   #4
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Math error... when you add 2-6 volt batteries together you only get twice the voltage the amps stay the same... so you would have 5.76 kwh..
the thicker plates in 6 v batteries make them last long ..
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Old 09-09-2014, 07:39 PM   #5
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Quote:
Originally Posted by Seann45 View Post
Math error... when you add 2-6 volt batteries together you only get twice the voltage the amps stay the same... so you would have 5.76 kwh..
the thicker plates in 6 v batteries make them last long ..
So the diagrams are not correct?
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Old 09-10-2014, 08:25 AM   #6
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those are 12 volt diagrams... you said you are using 6 volt.. when you double the voltage the amperage stays the same when you keep the same voltage the amps double..
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2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
175 days boondocking in 2017
215/2016, 211/2015, 196/14, 247/13, 193/12

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