Register to reply

Convert $/Ah to $/kWh

by km011
Tags: $ or ah, $ or kwh, convert
Share this thread:
km011
#1
Jul10-14, 10:56 AM
P: 1
It has been years since my college physics class and I'm struggling to get an answer that makes sense. I'm trying to convert the price of battery cells from $0.76/Ah (for a 2.8-3.0 Ah battery cell) assuming 3.6 V to $/kWh.

This is likely really simple, but I really want to understand how to do this.

Thanks!
Phys.Org News Partner Engineering news on Phys.org
An innovative system anticipates driver fatigue in the vehicle to prevent accidents
Squink personal factory aims to make circuit prototyping easy
Catching grease to cut grill pollution
cpscdave
#2
Jul10-14, 11:25 AM
P: 112
Amps are Coulumbs/sec (so Ah would be a measure of columbs)
Volts are Joules/Coloumb
so to get KWh (which is joules) You'd take Ah*V
jim hardy
#3
Jul10-14, 09:14 PM
Sci Advisor
PF Gold
jim hardy's Avatar
P: 3,500
Quote Quote by cpscdave View Post
Amps are Coulumbs/sec (so Ah would be a measure of columbs)
Volts are Joules/Coloumb
so to get KWh (which is joules) You'd take Ah*V
there's an unaccounted for "kilo" in there somewhere ?

meBigGuy
#4
Jul10-14, 11:17 PM
P: 1,072
Convert $/Ah to $/kWh

Also realize that the voltage is not a constant 3.6V. Look at the discharge curves for the batteries you are considering. Also, the Ah rating is at a particular specified discharge rate only. (and temperature)
jbelectric777
#5
Jul11-14, 01:54 PM
P: 5
amp hours are used for volume of a battery. ex: 9v Duracell = 500ma/hr. which only means the battery will produce 500ma for one hour. or 100ma for 5 hrs. you had dollar signs so I can only take that as what would the cost be in dc battery output compared to alternating commercial supplied current. using 500ma is too small so figure a couple 50AH car batteries. last time I checked one kwh (AC) was about ten cents a kwh. so your 100AH batteries deliver (12 x 100) = 1200 or about 12 cents per hour. By the time the trickle charge was done you probably would have spent 3 times that amount. and that doesn't account for what bigguy said about curves, drop, etc.
cpscdave
#6
Jul11-14, 07:25 PM
P: 112
Quote Quote by jim hardy View Post
there's an unaccounted for "kilo" in there somewhere ?
Opps there is indeed :) Only off by 10^3 thats a good day for me :D


Register to reply

Related Discussions
Convert GNm to MNm General Physics 2
To convert mg to kg Biology, Chemistry & Other Homework 4
How to convert from hex to dec ? General Math 6
How to convert? Computing & Technology 2
How do you convert m/s^2 to km/h? General Physics 15