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Is over-voltage protection recommended for small alternator?

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user9253

Joined: 28 Mar 2008
Posts: 1935
Location: Riley TWP Michigan

Posted: Wed Jan 05, 2011 8:02 pm Post subject: Is over-voltage protection recommended for small alternator?

Some builders think that they do not need over-voltage protection because their EFIS will warn of high voltage and they can shut off the master or add additional load to reduce the voltage, especially if the alternator is a small PM alternator.  In effect, they plan to regulate the voltage manually.

  I believe it is better to have automatic over-voltage protection because it will take the pilot too long to react.  By then expensive avionics could be damaged.  A small PM alternator can put out too high of a voltage if lightly loaded and the regulator fails.  I recommend some type of over-voltage protection.  What do others think?

Joe

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