On Sunday 27 June 2021 07:41:35 fxkl47BF via Emc-users wrote: > 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-CHEVROL >ET-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:hYUAAOxy4f >VTEuR6. 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. > I think that formula might be in the Machinists Handbook but mine isn't handy. In any event that 6.5 hp engine is too puny to pull that 220 amp alternator at full output as thats 3.19 kilowatts at around 14.5 volts to the battery. And thats w/o any wiring losses.
Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
