Hello guys, You are touching on a situation that is worth exploring. I have been test running my 912ULS, B&C AVC1 regulator with an Earth X 680, and my G3X is indicting after start up 13.4 volts with a high amperage. Examples are 3400 rpms at 13.5 Volts at 15amps, or 4000 rpms at 13.8 V at 18 amps. Called and talked to Earth X, they said this was normal with an avionics load at 6-7 amps, and roughly 11 amps leftover to charge the lithium battery. Only once did my system normalize to 14.4 volts at 6 and 7 amps. This did occur at the end of one of my run sessions, however I have yet to repeat this condition. Being that I'm on the ground testing while using my header tank as a main fuel tank, I run out of gas after about 20 mins. Thinking if I run longer than 20 mins my battery will normalize. As mentioned from Earth X, lithium batteries have a very low charge resistance, therefore they command as much amperage as they can get until the battery is back to full charge. Once charged the amps should come down, and voltage should go up. Again, Earth X tells me what I am experiencing is normal.

The million dollar question is, does anyone know the max continuous time for AC generator at full capacity? My fear is that this situation may over heat, or overtax my copper windings around the magnets and cause a total failure. On take off, I will be running at max power, then to 5500 rpms for an extended time. Should I be concerned? I do not know enough about the rotax electrical system or Earth X batteries to know any better.

Any other thoughts from other Rotax 912 pilots using the AVC1 and Earth X Battery?

Thank you for your comments!

Mike