batteries in series capacity
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NABCEP certified Technical Sales Professional
[URL="http://www.solarpaneltalk.com/showthread.php?5334-Solar-Off-Grid-Battery-Design"]http://www.solarpaneltalk.com/showth...Battery-Design[/URL]
[URL]http://www.calculator.net/voltage-drop-calculator.html[/URL] (Voltage drop Calculator among others)
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If batteries connected in series offer more volts and more capacity then whats the point of parallel connection? More amps doesn't seem to offer any advantage in a solar panel set up.Comment
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But answers include being limited to 12V for compatibility with existing equipment. But in that case you still have to option of going with commercial batteries in 6V, 4V or even 2V values to go in series.
Another "answer" is getting access to lots of cheap 12V batteries and being stuck with the mindset of a 12V bank.
Finally, for a small system going with 12V "battery" panels and a PWM controller argues for a 12V system.
But all of these are weak arguments.SunnyBoy 3000 US, 18 BP Solar 175B panels.Comment
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Unless I plan to open my own LFP battery factory in China, I need to use what is available. To use the least # of cells, I choose 300Ah x 2 x 8: 8 pairs of 2 in parallel.Comment
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I was checking out an ah to kwh calculator and it seems more volts = more kwh. For example 250 ah at 12v = 3 kwh and 250 ah at 48v = 12 kwh.
So if I bought 4 12v 62 ah batteries would it trump 2 12v 125 ah batteries?Comment
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More volts means more kWh, but more AH also means more kWh.SunnyBoy 3000 US, 18 BP Solar 175B panels.Comment
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Your calculation method is off. It's AH x V / 1000. Your method is multiplying the voltage and not the amount of batteries.
250 x 48 / 1000 = 12
250 x 24 / 1000 = 6
Which would mean a 48v battery bank would last twice as long as a 24v battery bank.
Unless I'm wrong.Comment
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On paper it makes no difference a 12 volt 62 AH battery = 744 Watt Hours x 4 = 2976 watt hours, As I stated before power adds no matter how you arrange the 4 batteries.
12 volts x 248 AH = 2976 wh; All 4 batteries in parallel
24 volts x 124 AH = 2976 wh; 2 in series, in parallel with 2 in series
48 volts x 62 AH = 2976 wh; All 4 in series.
Series circuits: Voltage and Power adds. Amp remains the same
Parallel circuit: Amps and Power Adds, Voltage remains the same.MSEE, PEComment
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CS6P-260P/SE3000 - http://tiny.cc/ed5ozxComment
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You are correct. Maybe putting up some type of visual diagram will make it clear to some of the people that still don't get the "math" part.Comment
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Why do these calculators
This is a free online tool by EverydayCalculation.com to calculate capacity or power output of rechargeable batteries given it's Ah value.
say more voltage = more kwh at the same Ah then?
Also @sunking you're changing the ah along with the voltage, that doesn't make any sense. The point is to have 4 62 ah batteries to = 2 125 ah batteries which = 1 250 ah battery. The only thing that changes is the voltage.Comment
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A 12volt 100Ah battery gets you a 12volt 100Ah system = 1200 watt hours.
And 4 x 12volt 100Ah batteries wired in series get you a 48 volt 100Ah system = 4800 watt hours
So the higher voltage battery system at 48volts yields more than that 12volt system but there is a different number of batteries involved.
If you take those same 4 batteries and wire them in parallel you will get a 12 volt 400Ah system = 4800 watt hours.
So you will get 4800 watt hours if you wire those 4 batteries in series or parallel which is what the others have been trying to tell you.Comment
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Why do these calculators
This is a free online tool by EverydayCalculation.com to calculate capacity or power output of rechargeable batteries given it's Ah value.
say more voltage = more kwh at the same Ah then?
Also @sunking you're changing the ah along with the voltage, that doesn't make any sense. The point is to have 4 62 ah batteries to = 2 125 ah batteries which = 1 250 ah battery. The only thing that changes is the voltage.
4 x 12volt 62Ah wired in parallel = 12v 248Ah system = 2976 watt hours
2 x 12volt 125Ah wired in parallel = 12v 250Ah system = 3000 watt hours
1 x 12volt 250Ah battery = 12v 250Ah system = 3000 watt hours.
4 x 12volt 62Ah wired in series = 48v 62Ah system = 2976 watt hours
2 x 12volt 125Ah wired in series = 24v 125Ah system = 3000 watt hours
1 x 12volt 250Ah battery = 12v 250Ah system = 3000 watt hoursComment
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