Re: Light-Sport Aircraft Yahoo group Re: Maxpro Battery monitor

Went out to the airport today after resoldering all the connections and replacing the diodes and the thing is working like a charm. Couldn't go flying (too gusty) but if it behaves at full throttle I will declare this project a success. Thanks to those who helped. (I have mounted the doodad on a cigarette lighter style plug so I can remove it if it should misbehave once airborne. One thing I've discovered about my 2-place airplane (mine's only a little heavier than a LSA) is that it rides like a truck in turbulence (and has no autopilot). If anybody has learned any good techniques (either by examining online weather forecasts or through briefer inquiry) for predetermining how bumpy the ride might be I'd be all ears to hear about them.

 

----- Original Message -----

From: Ed Garcia

To: Sport_Aircraft@yahoogroups.com

Sent: Friday, March 26, 2010 8:27 PM

Subject: Re: Light-Sport Aircraft Yahoo group Re: Maxpro Battery monitor

 

Add a capacitor across the power and ground close to the electrical input. This is called a "bypass" cap and is used to smooth out any nasties outside sources produce. It will absorb and spikes and fill in any valleys in a dirty power supply. You are probably just seeing electrical noise generated by the alternator. Try about 10 to 50 uF cap to start with.

Ed

---

From: Bill Hobson <wrhobson@aol.com>
To: Sport_Aircraft@yahoogroups.com
Sent: Fri, March 26, 2010 4:47:03 PM
Subject: Re: Light-Sport Aircraft Yahoo group Re: Maxpro Battery monitor

 

It's a Lycoming O-235 and the battery is a Gill sealed 14V battery purchased new 2/1/2010.

 

----- Original Message -----

From: Michael Huckle

To: Sport Aircraft

Sent: Friday, March 26, 2010 3:06 PM

Subject: RE: Light-Sport Aircraft Yahoo group Re: Maxpro Battery monitor

 

What kind of engine is it?
What kind of battery?

Mike

> The diodes drop the monitored voltage by 1.2 volts.
> The device was made to monitor 12v DC batteries. Hence the need to deliberately
> drop the voltage to a range meaningful to the device. When monitoring the
> voltage with a digital meter it shows a steady 12.3 volts DC, but I'm wondering
> if (because of the alternator) the voltage is really in the form of a
> square oscillating wave. The device works 100% right until I kick the alternator
> on. Then it works about 90% of the time as expected, but randomly switches
> briefly to a flashing red display for a second then switches back to steady
> blue. I'm hoping the people who I bought the gadget from can offer a suggestion
> as to what to do if this is the cause.


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