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Adding Up Battery Amp-Hours?

Discussion in 'Home Power and Microgeneration' started by Antipodean Bucket Farmer, Oct 2, 2005.

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  1. Hi, Everybody,

    Let's say that I want to make a small 12-volt battery
    supply. So I use a pair of cheap 6-volt sealed gel
    cells, in series.

    Each of the two batteries is rated at, say,
    5 Amp-Hours.

    Will they add together, for a total of 10 Amp-Hours?
    Or will the pair just provide 5 AH at the higher
    voltage (I.e. 12-volts)?

  2. GeekBoy

    GeekBoy Guest

    yes that is correct as voltage and amp are inverse of each other. As the
    voltage increases the amperage decreases.

    Try 4 batteries in series-parallel.
  3. Vaughn

    Vaughn Guest

    HUH? Actually, current (amperage) is directly proportional to voltage and
    inversly proportional to resistance.
    I (current) = E (voltage) / R (resistance)

  4. Each cell is rated at 5 AH so in series they will provide double the voltage
    but the same 5 AH.

    If you parallel them you'll get 6V at 10AH
  5. Vaughn

    Vaughn Guest

    Just noticed that someone x-posted this thread. You can read any further
    responses from me at

  6. Vaughn

    Vaughn Guest

    Wrong. You are thinking about the power formula P = I X E

    If you were to apply 220 volts to your 110 volt hairdryer, you would (for a
    brief amount of time) have 16.66 amps and be producing 4000 watts of heat.
    Shortly thereafter, the "magic smoke" would come out, and your hair dryer would
    be toast. Current is proportional to voltage and always has been. Read up on
    George Ohm's theory.

    What you are trying to say is that a 220 volt 1000 watt heater will have half
    the current (and twice the resistance) of a 110 volt 1000 watt heater. (P = I X
    E) but I is still proportional to E.

  7. Steve Spence

    Steve Spence Guest

    Two 6v 5ah in series is 12v 5ah.
    Two 6v 5ah in parallel is 6v 10ah.
  8. Steve Spence

    Steve Spence Guest

    um, no. please try again. you are thinking of loads in watts.
  9. Vaughn

    Vaughn Guest

    I think we are done.

  10. Steve Spence

    Steve Spence Guest

    No, you missed it completely.
  11. Steve Spence

    Steve Spence Guest

    Well, that has nothing to do with batteries in series or parallel. You
    applied one concept to an unrelated problem.
  12. Steve Spence

    Steve Spence Guest

    Now you've got it.
  13. K.A.M

    K.A.M Guest

    Here are some wonderful handy BATTERY wiring diagrams for battery BANKS
    Series & parallel

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