# how many watts from this battery?

Discussion in 'General Electronics Chat' started by rispodium, Mar 18, 2014.

1. ### rispodium Thread Starter New Member

Mar 5, 2014
8
0
I am thinking of buying a 24v 10aH battery.

if P= V*A THEN the power is 240 watts right?

because it says 10aH does this mean it can give 240 watts for
10 hours?

can it give 120 watts for 20 hours?

help appreciated

2. ### MrChips Moderator

Oct 2, 2009
18,187
5,709
10Ah means that the capacity is 1A for 10 hours.
At 24V, that is 24W for 10 hours or 12W for 20 hours.

3. ### kubeek Expert

Sep 20, 2005
5,452
1,036
Then the energy stored is 10*24*3600 Joule = 864kJ. None of these number say anything about power, only how much total energy you can get out of it.

4. ### wmodavis Distinguished Member

Oct 23, 2010
739
151
Power is NOT energy.

Energy is NOT power.

Back to basics...

5. ### Ramussons Well-Known Member

May 3, 2013
764
136
No, it's 240 Watt Hours. Theortically, 240 Watts for 1 Hour or 1 Watt for 240 Hours. Since batteries are Normally Discharged / Charged at a 10 Hour rate, we can presume that it is 24 Watts for 10 Hours, actually less than that considering an Efficiency factor.

Ramesh