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Old 06-22-2014, 05:13 PM   #1
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4-6Vs vs. 6-6Vs

What increase in benefit would we get from adding two additional 6V deep cycle Deka GC25s to our four house battery system?
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Old 06-22-2014, 05:21 PM   #2
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33% increase in boondocking time or 33% more things you can rune while you are boondocking.
Just remember you should not mix old and new batteries. If your current batteries are less than six months there should be no problem in dding two more, assuming you have the room ar can make the room.
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Old 06-22-2014, 05:24 PM   #3
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About a 30% increase in time before Recharge was needed and about 150Lb decrease in payload.
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Old 06-22-2014, 05:40 PM   #4
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I will join the chorus but it is 50% more run time not 33 or 30% The increase from 2 12 volt 4-D batteries to 3 is 50 percent.

(Each pair of Deka's is roughly one 4-D electrically, Think of them that way please, answers many questions)

As to old/new comments.. I have mixed batteries of varying ages for years and the only problem I have had is identifying the bad one.

My Craftsman Clamp on DC ammeter.... Does a great job there.
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Old 06-22-2014, 06:01 PM   #5
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Quote:
Originally Posted by DoubleCK View Post

What increase in benefit would we get from adding two additional 6V deep cycle Deka GC25s to our four house battery system?
Your current battery bank most likely has about 450 AH's of power. You can only use 50% or 225 AH's of that before needing to recharge them back to Float SOC.

If you add two more 6 VDC batteries to the bank, you would be adding 225 AH's to what you have now.

You would increase the usable AH's to 450 from what you have now.

Some valuable reading is found HERE.

Dr4Film ----- Richard
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Old 06-23-2014, 11:27 AM   #6
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As Richard noted in his post, you only get 50% depth of discharge (DOD ) with lead sulphide batteries (might be best to only go to 40% which is where we tried to stay within when we had glass mat). He also noted the weight penalty. We went to LFP for considerably less weight and 80% DOD. For 250# of batteries we have approximately 10kW of energy and can safely use 8kW - or so say the pundits
Reed and Elaine
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Old 06-24-2014, 09:27 AM   #7
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Very Cool R & D! What does that set-up set a person back?
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Old 07-24-2014, 05:24 PM   #8
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The cost of additional batteries!
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