i'm gonna explain my screwup here because this group of folks has a very diverse range of expertise. enough kiss'n up. if you know of a list that would be more appropriate please let me know. i've had a desire for some time to build a gasoline powered battery charger. i've seen it done several times and thought no big deal. my first thought was to use a 3 hp engine and a 100 amp one wire alternator. but since i already had a 6.5 hp engine i decided to go with that and an alternator like this https://www.ebay.com/itm/NEW-CS130-ONE-WIRE-RED-ALTERNATOR-FOR-CHEVROLET-GMC-CHEVY-220-AMP-1-WIRE-1100665-/283190864732?hash=item41ef7dab5c. i also added an ammeter like this https://www.ebay.com/itm/301111474999?hash=item461ba47b37:g:hYUAAOxy4fVTEuR6. i finished it and was ready to test. i pulled a big battery out of my tractor, connected a 1000 watt inverter, and about an 800 watt load. i cranked the engine and connected it to the battery. ammeter showed about a 7 amp load. i switched on the inverter and it went to about 9 amps. i switched on the load and it went to about 75 amps. the engine was straining. i disconnected the the alternator from the battery so the load could draw down the battery. after about one minute i reconnected the alternator. the ammeter jumped to about 110 amps and it promptly stalled the engine. i tried several times with the same results. all of my feeble calculations led me to believe that a 6.5 hp gasoline engine was more than enough to power a 220 amp 12 volt alternator. either my 6.5 hp engine is more feeble than my brain or my calculations are way off. thanks for any feedback.
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