sci.energy

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> 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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