Litium battery question

[Shadowrider]

Mike I have never read or seen a max alternator output time limit. 18 amps output on a good day and full power is what the stock will put out. It takes about 30 min into the flight before I will normalize my battery volts at 14.1. Edge Performance has a graph I remember seeing for the stock versus the aftermarket one they sell. I will see if I can find it. But based on your description I would have to agree that everything seems normal. You wont see 18 amps until your fully power. Just FYI I know a couple that will never see normalized voltage unless they turn off all the lights. (So they are running the alternator at max entire flight)

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[Delta Whisky]

Mike - here's a link to my go to page on the Rotax alternator. HTH. http://contrails.free.fr/elec_alt_rotax_en.php

[Eric Page]

Alternators are limited by the physics inherent in their magnetics. They are incapable of putting out more current than their design limit. If more is demanded of them, their output voltage will drop, limiting current. Unless Rotax under-specified the copper wire diameter in their alternator design, it's not a worry.