Convert $/Ah to $/kWh

  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.

  2. jcsd
  3. 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
  4. jim hardy

    jim hardy 5,460
    Science Advisor
    Gold Member
    2014 Award

    there's an unaccounted for "kilo" in there somewhere ?
  5. 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)
  6. 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.
  7. Opps there is indeed :) Only off by 10^3 thats a good day for me :D
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