Join Date: Jun 2008
Bikes: Cannondale T700s and a few others
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Do you know how hard it is to peddle 20 amps!?!?!?!?!!?
Between weather, buring vacation days, commitments requiring me to drive etc I have not been able to do much commuting since Thanksgiving.
Couple years ago the business behind the one I work for moved. They are a fitness supply place.. They had a parted out StairMaster Momentum
exercise bike they tossed. The electronic were gone as was all the covers. All the was left was the drivetrain with the alternator they use for resistance by running it against a massive resistor.
When I saw it I immediately thought of my kids that cant seem to turn lights or TV's off when they leave a room so I thought I would make them peddle to watch the TV. Never got around to building it.
Got around to messing with it today. Needed power to to kick it into charging. I think in it stock configuration they were using a variable resistor on the field circuit to control the output voltage and the resistance at the peddles as a result. I need to drive a 12v-110 inverter so I diced to run it straight 12v to the field with a MASSIVE 150ah house battery from my camper that is need of a charge. Well as I peddle faster the voltage comes up making it harder to peddle as it increases the amperage to the battery.
Holy crap! It is all I can do to peddle this bugger for more then a few minutes at a time trying to get the battery up to charge.
I need to get a 12.6v regulator on the field to make this easier and prevent blowing out the inverter.