Question about amp hours

[Russelljw]

I have a 24 v bank…

Six 12v

Each battery is 149 ah

Bank makes 450 ah

I’m changing over to 48v system


I have eight 149ah 12v to use

But it seems I will be getting less amp hours

Only 300.

Does this mean I should leave it alone at 24v bank

Or will the 48v bank be more efficient some how.

If so how?

Thank you so much fellers!

 

[fat_old_sun]

You're getting 300 Ah at 48V! The overall energy is 300Ah times 48V = 14400 Watt-hrs
your 24V system was 450 Ah @ 24V with a energy capacity of 10800 Watt-hrs.

 

[Lt.Dan]

Always convert to watt-hours.

Watts is watts!

 

[n2aws]

I have a 24 v bank…

Six 12v

Each battery is 149 ah

Bank makes 450 ah

I’m changing over to 48v system


I have eight 149ah 12v to use

But it seems I will be getting less amp hours

Only 300.

Does this mean I should leave it alone at 24v bank

Or will the 48v bank be more efficient some how.

If so how?

Thank you so much fellers!

The equation is volts times AH = watt hours

You started by saying you have 6 12v 149ah batteries. then later you said 8. so, I'll assume "8" for the below.

12 (volts) x149(ah) = 1,788 watthours per battery.
8 of those x 1,788 each = 14,304 total

Now, you have the total, regardless of how you wire it.

You can do:
2s4p for 24v.
24v x 149ah = 3576 each, and 4 of those is (4x3576) 14,304

4s2p for 48v
48v x 149ah = 7152 each, and 2 of those is (2x7152) 14,304.

Either way, it's the same amount of energy storage.

As they say, wire in series increases the voltage, but not the AH.
wire in parallel increases the AH but not the voltage.


So all of that to say: the AH looks like it's "half" of the 24v setup, because it is. but it's the same amount of energy