Cranking (Starter Motor) Current - PA28
I am trying to find out what the nominal current draw is for a PA28 (IO320 engine) for the starter motor, assuming it is under normal mechanical loading. I want to know this for the purpose of building up a (lightweight) battery pack for "emergencies."
A few weeks ago our a/c battery was flat, I connected a separate 12V supply (a heavy Pb-Acid battery) and was surprised how rapidly the prop rotated, suggesting the draw was much less than the 200A or so I guessed it may be. At a rough guess from this and judging by the a/c battery cable gauges it is probably nearer 100A.
Help appreciated,
Fuji