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# Capacity rating Factor Kt in Battery sizing - IEEE 485

## Capacity rating Factor Kt in Battery sizing - IEEE 485

(OP)
As in IEEE-485,

Kt factor is the ratio of rated Ampere-hour capacity to the Amperes that can be supplied by that cell for T minutes at 25 degree celcius to a given end of discharge voltage.

How do we come to know this rated Ampere-hour capacity of the battery before calculating? (as we are doing this to arrive at the same).

### RE: Capacity rating Factor Kt in Battery sizing - IEEE 485

That is usually what the battery is bought as. 100AH, 500AH, 420AH, etc.

Alternatively you can measure it. Measure it at the expected draw for your application.

Keith Cress
kcress - http://www.flaminsystems.com

### RE: Capacity rating Factor Kt in Battery sizing - IEEE 485

Note that IEEE-485 specifically covers short duration, high-current, draws
http://web.engr.oregonstate.edu/~webbky/ESE471_fil...

But, the question you're asking seems backwards. You determine what capacity you need from whatever is using the battery, i.e., if it's 12V at 1A, or 10A, and you account for the intensity of the draw on the capacity of the battery, and then you select a battery that meets the requirement.

TTFN (ta ta for now)
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