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  • SeanG30 commented on cid2323's instructable Lawnmower Power Generator With A Twist12 months ago
    Lawnmower Power Generator With A Twist

    Okay, great idea, but I see some basic facts I would like to clarify. You are using an alternator, which creates AC power (Hence the name; originally cars used DC generators but switched for better efficiency). All modern alternators also contain a rectifier which changes the AC generated by the alternator into DC. Then you are taking the DC output of the alternator and inverting it back to AC. Each time you change from one to the other you lose efficiency; i. e. available power. So instead of an alternator why not use an AC motor? A motor and a generator are identical; one produces mechanical energy when power is applied and the other produces AC power when the shaft is mechanically spun; so use the engine to spin the shaft of the motor and voila! you will produce AC current. No...see more »Okay, great idea, but I see some basic facts I would like to clarify. You are using an alternator, which creates AC power (Hence the name; originally cars used DC generators but switched for better efficiency). All modern alternators also contain a rectifier which changes the AC generated by the alternator into DC. Then you are taking the DC output of the alternator and inverting it back to AC. Each time you change from one to the other you lose efficiency; i. e. available power. So instead of an alternator why not use an AC motor? A motor and a generator are identical; one produces mechanical energy when power is applied and the other produces AC power when the shaft is mechanically spun; so use the engine to spin the shaft of the motor and voila! you will produce AC current. Now you will need a voltage regulator, however you will NOT need an inverter; And you will be able to produce much more power at a better efficiency; also your choice of motors are near endless; old washing machine motors come to mind among dozens of other low cost options. Varying pulley sizes can attain proper rotational speeds. People already use old motors for power generation by attaching blades to the shaft and using wind to turn the motor. Search the internet and you will find a multitude of articles on how to use an old motor to produce electricity; combine that with the old lawn mower concept and you will have dozens more available options to produce much more power.

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