Turned the alternator off at 5500 feet and flew for 1 hour before voltage

came down to 11 volts.

 

Do not know how low before some of the systems start shutting down.

Anyone have any ideas on coils, injectors, EC2's before they quit??

 

That’s pretty good.  I’m pretty sure that PC 625 is rated at 18 amp-hr; but a-hr ratings are not necessarily consistent.  It’s based on a certain current draw down to a certain voltage; and I have found the makers don’t always rate them the same.

 

Just based on the typical solid state devices, I’d expect things to keep operating down to at least 10 volts, and maybe lower.  I have two of the PC-625s, so they should keep my 20B spinning for quite awhile in the event of an alt failure.

 

Had to richen up immediately when I shut alternator off.  Hmmmm??

 

That’s interesting. Probably the result of the injector characteristics changing as the voltage drops 2 – 2 ½ volts.  Possibly also some effect on the ECU, but I wouldn’t know.  That’s about a 15% drop in voltage when you turn the alternator off.

 

Bernie, about 39 hours now

 

Go Bernie!!

 

Al