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Handy Formula to calculate the output of any generator at any given RPM……. First off 3 thing must be known… RPM, Open voltage at that RPM and the Ohm's of the stator coil.
Measured RPM / Open volts = RPM per volt To find a Desired output the formula is: Volts + ( Amps * Ohms ) = Open Voltage ( necessary to achieve this output ) Open voltage * RPM per volt = RPM needed to achieve desired output
Example: Alternator spinning at 1500 RPM delivers an open voltage of 34.8 volts so…. 1500 / 34.8 = 43.1 RPM per volt The stator coil reading is .6 ohm
Lets say we would like 14.6 volts at 10 amps from our unit 14.6 volts + ( 10 amps * .6 ohm ) =20.6 open voltage 20.6 * 43 rpm per volt = 885.8 RPM If you would like to know an output at a certain RPM you simply change the formula to: RPM / RPM per volt =Open Voltage (OpenVoltage-desiredvoltage) /ohms = Amps Example: 885 RPM at 14.6 volts
And there you have it… since, for the most part, the voltage and rpm are a constant its easy to calculate the output of any unit |