Cycle Analyst V3.1 User Manual
Rev 1.0
6.13 Set Current Sense Shunt Resistance
The Cycle Analyst detects the current and power flowing through your system by
looking at the small voltage drop across a shunt resistor. This allows it to work
over a very broad range of power levels, from small 200 watt pedalecs to 50kW
electric cars. It is essential to set the RShunt value in the CA to match the
connected sense resistor for accurate watts, amps, and amp-hour readings.
The shunt resistance is configured in the calibration setup menu and the current
value is shown on the preview screen.
For systems that are directly plugged into the motor controller, the calibrated
Rshunt value should be printed on the controller label.
Typical imported 6 mosfet controllers have ~3-6mOhm shunts, while larger 12
mosfet controllers are usually 2-3 mOhm. Ezee controllers are about 1.5 mOhm
and the Grin Phaserunner / Baserunner are both 1.0 mOhm. If you leave RShunt
at the default value of 1.000 mOhm on controllers that have a higher actual
resistance, then the amps and watts readings will be way too high.
The Stand Alone shunt that we
offer for controllers lacking a 6-pin
CA plug is exactly 1.000 mOhm,
which is conveniently the default
value in the CA.
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