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

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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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