This $100 JUNKYARD ALTERNATOR Can Become The Heart Of An Off-Grid Power Setup. Why Buy A Generator?!

DIY alternator generator build, one-wire alternator, Predator 212 alternator, 12V battery charger, off-grid power setup, alternator pulley ratio Here's how to build a high-amp 12V battery charger from a junkyard alternator and a small engine. A GM Delco 10SI or 12SI with a $10 self-exciting regulator becomes a one-wire alternator, so it needs only one cable to the battery. Car alternators are only about 50% efficient, so 100 amps at 14 volts takes about 3.75 horsepower. A 6.5 HP, 212cc engine like the Harbor Freight Predator handles that easily. A 2:1 pulley ratio spins the alternator near 6,000 RPM. Parts list: a 60 to 100 amp alternator, a 5 to 7 HP engine, pulleys, an adjustable V-belt, a steel base plate, heavy-gauge cable, a fuse near the battery, and a volt/amp meter. Run it outdoors, and always use a belt guard. 00:00 Why buy a generator? 01:00 From dynamo to alternator: Chrysler's 1960 breakthrough 02:20 How a car alternator works 03:15 What a junkyard alternator costs 03:36 The $10 one-wire regulator trick 04:28 How much engine you really need 05:10 Pulley ratio and alternator RPM 05:52 The generator spec most people never read 06:45 Alternator vs generator charging efficiency 07:15 Downsides of a DIY alternator charger 07:52 The lithium battery mistake to avoid 08:32 Parts list and build tips 09:25 Best use: solar backup charging #OffGrid #DIYGenerator #Alternator #OffGridPower #SolarBackup #BatteryCharging #DIYProjects #Prepping #Homestead #EnergyIndependence