A lot of those battery banks only take 40 to 60 watts of power [meaning load]
you need to consider how it's wired. I have a power station that is made up of 9 packs of 4 cells each. So l like GENE says - it limits the TAKE or DRAW to 3 amps or so. Also depends on why kind of motor you use on the bicycle. I have a treadmill motor so the internal resistance is higher. So I get back EMF more easily. So as GENE says - powering direct to DC is way more efficient. You can get a much higher DRAW so that you get much less reverse torque or "back emf" on the bicycle generator. It is kind of trippy because as you increase the amp output the pedaling gets EASIER.
60 watt 5 amp 12 volt bulb powered by bicycle via DC-DC buck converter t... March 4, 2020
Output: up to 40VDC, 15 Amps nominal, 20 Amps peak, 300 Watts Peak, Internal Resistance: ~0.35 Ohms
https://mightymushrooms.com/?page_id=153
Treadmill motor internal resistance?
Fully connected with 2.6ohm resistance.
https://www.electro-tech-online.com/threads/help-with-dc-motor-from-treadmill.88440/
That's why I only get 2 amp-hours consistently or 3 amp-hours - for a half hour work out.
While the Power Pedal using a Scooter DC motor gets 5 amp hours consistently and 7 amp hours for a half hour work out....
So the question is do you want to pay $2000 for the Power Pedal? Or is it $300? Or the Treadmill bicycle generator price: FREE.
except gas money to go haul the treadmill off Free Craig's list and the Tools needed to take it apart, and the education needed, etc.
The resistance is variable based on what you connect to the generator. Assume a resistance scale of 1 through 10 with 10 being impossibly difficult and 1 being no resistance at all. If you connect a 25 Watt load (Like a 25Watt light bulb) then the difficulty will be around 3 or 4. If you connect a large 12V battery (Size 28 Amp Hours) then the difficulty resistance level would be around 6 or 7. If you connect two 100W loads then it would be 10.
Assume a charging Voltage of 14 Volts with a 20 Amp Hour Battery. Then you would pedal a full size bicycle with the rear wheel spinning at about 5 Miles per hour. Thanks for asking, Bradley from Pedal Power Generators LLC
https://pedalpowergenerator.com/shop-pedal-power/kids-spin-bike-generator/
So without the bicycle the cost is $750.
So the question is - how long do you have to pedal to pay off that cost compared to a FREE Treadmill generator? You do get exercise by pedaling so that is good.
But for the same price you could buy a lot of gasoline - a LOT!! Or maybe another lithium generator?
https://forum.allaboutcircuits.com/threads/measuring-dc-motor-resistance.140383/page-2
It's not so simply to "measure" the internal resistance. I think I did a calculation on my previous treadmill motor - way back. I have several blogposts on this.
Previously I think I attributed the watts of this Scooter Motor based on NOT using a DC-DC buck converter. But I didn't realize the differences in internal resistance of the motor. In other words the reverse EMF is much lower as the amps go up.
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