It's 80% of the max alternator output current. Mine just barely came under
the 80% when they were installed, but then I later added an autopilot which
brought it over the 80%. The avionics shop got around it by adding a placard
stating something to the effect that the autopilot may not be engaged with the
landing lights on.


Jay Masino wrote:

zatatime wrote:
All three turned on at idle would exceed the
alternator output.
Doesn't that make your airplane "illegal" (technically speaking of
course).
I thought the total draw of an electrical system could not exceed 80%
of the output capacity of the alternator.
Am I incorrect, or is there more to this concept?

The way it was explained to me, once upon a time, was... Landing/Taxi
lights are considered "intermitant loads" and are not added in for the 80%
load calculation. Same goes for pitot heat. In fact, when you're adding
up your loads, you only add the receive power draw for your Com radios,
and not the transmit power draw.

--- Jay

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