sci.energy

Thank you!

In an electric car, multiple batteries are used.
Is it more advantageous to connect them in series or in parallel?
Connected in series their voltages sum up.
Connected in parallel and their AH increase.

But with a motor controller, you get to control and lower the voltage.
With a parallel, you'll have to step up the voltage to match the
voltage of the ones connected in series.

My question is,

With two electric cars with batteries...

connected in series, two 12 volt,10aH batteries = 24volts with 10aH
versus connected in parallel two 12 volt,10aH batteries = 12volts with
20aH

Would the vehicle with batteries connected in SERIES travel at similar
speeds and similar range to the "parallel setup" IF its voltage were
brought down to 12volts by the motor controller???








On Aug 27, 1:47 am, "Stephen Sprunk" wrote:
> wrote in message
>
> news: @ ...
>
> > What is the unit of measurement of the capacity of batteries?
> > what I know is Ampere-Hours BUT I also see Kilowatt-hours...
>
> You should either see Amp-hours at a given voltage, or kW-hours.
>
> > What is the difference between ampere-hours and kilowatt-hours?
>
> Amperes are current; Watts are power. The "-hours" part means how many
> hours the unit would last at the specified discharge rate. In theory, if
> you discharge at twice the rate, cut the time rating in half, and vice
> versa.
>
> Of course, most batteries don't discharge perfectly; their capacity varies
> based on the discharge rate (and temperature) as well, so it's entirely
> possible that if you double the discharge rate, you may only get a third of
> the capacity, and if you halve the discharge rate, you may only get one and
> a half times the capacity. Batteries are funky like that.
>
> > What is the formula to do kW-h to A-h conversions?
>
> 1W = 1A * 1V
>
> So, for example, if you had a 48V battery rated for 500Ah, that'd be 24kWh.
>
> S
>
> --
> Stephen Sprunk "God does not play dice." --Albert Einstein
> CCIE #3723 "God is an inveterate gambler, and He throws the
> K5SSS dice at every possible opportunity." --Stephen Hawking
>
> --
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