JP256 wrote:Airplaneflyer wrote:I have been having some battery problems, especially when I have a long taxi, the battery has failed me on two start ups since I've owned the plane.
Does your airplane have a generator, or an alternator? Mine has a generator, and doesn't make enough juice to recharge the battery until I'm well above idle. If yours is a generator, and you experience a similar issue you can either operate a bit above idle (just enough to get the generator to make electricity) or replace the generator with an alternator. I'm cheap, so I just open the throttle a bit to where my alternator (barely) shows a charge.
When I bought my airplane, it had a generator, and otherwise ancient electrics. It was actually fortuitous that the engine came apart only 15 hours later, because otherwise I'd have likely postponed converting to an alternator--I had that done as part of the new engine installation. Believe me, it was one of the better expenses! In addition to the conversion, my IA created a subpanel and installed circuit breakers, getting rid of most of the fuses.
Likewise, mine wouldn't charge below about 1300 rpm, and even then, it was anemic. But the alternator puts out a nearly full charge at low idle, which is about 850 rpm (although I normally idle the airplane at 1000 rpm). A long taxi (generator) without any charging will deplete a battery awfully quickly. Lights dim, radios go inop, and the next time you go to fly, the battery is dead.
With the original Skylane I was partnered in, with a generator, it wasn't unusual at night to land after shooting an approach, and about halfway into the ramp, the radios would start shutting down (they were tube type Narcos), and by the time I was at the ramp, the lights were dim. So I got into the practice of shutting off the landing light right after touchdown and all the avionics individually, and if there weren't any other airplanes nearby, shutting off the taxi light as long as I could see OK.
So give strong consideration to converting to an alternator. It's really worth it. My alternator (which I think is a 65 amp--could be 60, but I'm not sure) is good enough that I can have everything turned on (all lights, all avionics, heated pitot, heated AOA probe) and still it shows a charge, even at 1000 rpm. I just don't worry about it.
Cary