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Electric power comes from mechanical power. The charging system is small so it doesn't rob too much horsepower, not because it's cheaper to do it this way.

Just a idea about an senior and good aftermarket charging system company that has salvaged some new sales failures for a friend. Charging system puked in a few hours after purchase. That takes the shine off of a new unit. Rick's to the rescue. Design wise, the stator is made "light" on the windings so the regulator can be lower cost build....i.e.....cheap as is the "power runs in the OEM harness. The regulator used is a waste excess charging current system. The excess current is shunted to ground over and above that required for the 13.6V ish to charge the battery and run accessories. A higher wattage stator will need a higher wattage regulator. $$$$$$$$ We used Rick's for years.....the latest "problem" I heard about was a xmxmxmx unit that had a strong stator but the voltage regulator used for certain models dies and the regulator is on national back order. NEWLY SOLD UNIT IS UNUSABLE and NO LIGHT AT THE END OF THE TUNNEL. Rick's built up a "custom" regulator to fix the problem that xmxmxmx Engrs could not or would not fix. It is a multi-year screw up so there was time if Rick's worked up a winner in a week why not the OEM Engrs. Contact Rick's and spec a hotter stator and a matching better regulator. Warning: I have had to beef up the stator wires and regulator supply and gnd wires over the stock OEM wiring harness for some real headlights on street bikes.....too much drop in the cheap wiring runs. Just saying, you might have to do some harness upgrades also. Rick's Motorsports Electrics ricksmotorsportelectrics.com

Its' not a car, this is a motorcycle engine with a small stator charging system. You can't expect to run high wattage accessories like a heater or huge light bars on these things . That will overwhelm the charging system, drain your battery an stop your engine. Could damage the charging system and voltage regulator too. You only have about 10 amps extra to run any accessories including lights.