Talk:How to Build a Mechanically Powered Battery Charger for LED Lighting
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- Performance and Discussion
-Charging current depends on the difference in voltages Assuming constant battery internal resistance, I=(V-Vbatt)/Rbatt -This design only works with a brushed DC motor where rpm is proportional to voltage, and torque is proportional to current -Note: the battery voltage increases with charge. The voltage of a fully charged battery is often greater than its nominal voltage
- Wiring the Charger
-V=IR not applied correctly. A resistor is not needed, however to ensure the battery doesn't overcharge, the rpm should be limited to the charged voltage of the battery.