dlm34077(at)q.com
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 Posted: Thu Jan 27, 2011 11:11 am Post subject: plane power alternator update |
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To their credit plane power sent a new alternator to replace the original unit which in 2.7 years had accumulated 375 hours. I made a ground run test today and the alternator generated 32A on startup at 850 RPM; buss voltage was 14.2V and 14.3V. It is possible that something was wrong early in the process (2008) because I never felt the Odyssey batteries ever received a full charge (I generally cruise 2250 RPM). I mentally attributed that to the fact that they were located at the rear of the aircraft through several contactors and 10 feet of wire. Toward the latter stages I just used both 680s in parallel for starting, although on the initial starts, a single 680 spun the IO540 quite easily. In addition as the alternator in the last hundred hours or so, it would take an RPM of 1200+ to get the voltage above 13.5V. Now I get !4.2V or better at idle RPM while still supplying 32A to run the avionics (14A) and recharge the batteries. It looks as though the problem is fixed.
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