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rparigoris
Joined: 24 Nov 2009
Posts: 792
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 Posted: Tue Oct 29, 2013 8:30 pm Post subject: Trusting a chargers reputation, what an idiot! |
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Hi group
I'm an idiot. I purchased an Odyssey PC545 a while back and listened to the distributors rhetoric, blah, blah blah I best buy one of his magical chargers custom suited for an odyssey battery. Wasn't very much so I bought one. My battery is aft located on my Europa Monowheel, so a bit of contortion needed to get to it. No problem. Very early on the strain relief for the insulation at the charger broke in half, so I was just measuring the charger output at the break (which is easily located forward). Today we were working on the flap control and were crawling around in the back of the aeroplane and decided we should check the voltage at the battery with the charger connected. The charger was indicating float (green) and at the forward break in the insulation at 13.54 volts. When we tested at the battery, it was only 12.75 volts? Closer inspection revealed really poor solder connection to the battery clamps. There is a plating on the clamps, and the solder never stuck real well. EZ fix, scratch, mild activated flux and solder. Just a note, best check charge voltage right at the battery, don't trust a green LED saying all is well.
Ron Parigoris [quote][b]
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bob.verwey(at)gmail.com
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| Posted: Tue Oct 29, 2013 10:39 pm Post subject: Trusting a chargers reputation, what an idiot! |
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Ron I am busy with a new build and have a similar problem..the battery voltage at the battery is 13.4 and the MGL Efis shows supply voltage as 12.9. I have checked all feeds and connectors, but cannot isolate the voltage drop....
Best...
Bob Verwey
On 30 October 2013 06:29, <rparigor(at)suffolk.lib.ny.us (rparigor(at)suffolk.lib.ny.us)> wrote:
[quote]
Hi group
I'm an idiot. I purchased an Odyssey PC545 a while back and listened to the distributors rhetoric, blah, blah blah I best buy one of his magical chargers custom suited for an odyssey battery. Wasn't very much so I bought one. My battery is aft located on my Europa Monowheel, so a bit of contortion needed to get to it. No problem. Very early on the strain relief for the insulation at the charger broke in half, so I was just measuring the charger output at the break (which is easily located forward). Today we were working on the flap control and were crawling around in the back of the aeroplane and decided we should check the voltage at the battery with the charger connected. The charger was indicating float (green) and at the forward break in the insulation at 13.54 volts. When we tested at the battery, it was only 12.75 volts? Closer inspection revealed really poor solder connection to the battery clamps. There is a plating on the clamps, and the solder never stuck real well. EZ fix, scratch, mild activated flux and solder. Just a note, best check charge voltage right at the battery, don't trust a green LED saying all is well.
Ron Parigoris | Quote: |
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[b]
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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| Posted: Sat Nov 02, 2013 5:54 am Post subject: Re: Trusting a chargers reputation, what an idiot! |
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| Quote: | | the battery is 13.4 and the MGL Efis shows supply voltage as 12.9. I have checked all feeds and connectors, but cannot isolate the voltage drop.... |
Subtracting 12.9 from 13.4 equals 0.5 volts which is the voltage drop across a diode. Is the MGL EFIS powered through an E-Bus diode? What happens when the E-Bus alternate feed path (if installed) is turned on?
Joe
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bob.verwey(at)gmail.com
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| Posted: Mon Nov 04, 2013 9:16 pm Post subject: Trusting a chargers reputation, what an idiot! |
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I run a wire direct from the Bat bus to the EFIS CB (2 amp) then via a switch to the EFIS. Sooooo, thinking out loud, it can only be the CB or the switch causing the voltage drop? My master switch is one of those manual types recently discussed on the list. All parts brand new, but worth checking! I imagine a .5v volt drop across the master could turn exiting once the starter starts pulling 200 amps!
Best...
Bob Verwey
On 4 November 2013 21:20, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
At 07:55 AM 11/2/2013, you wrote:
| Quote: | --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>
> the battery is 13.4 and the MGL Efis shows supply voltage as 12.9. I have checked all feeds and connectors, but cannot isolate the voltage drop...
Subtracting 12.9 from 13.4 equals 0.5 volts which is the voltage drop across a diode. Is the MGL EFIS powered through an E-Bus diode? What happens when the E-Bus alternate feed path (if installed) is turned on?
Joe
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Excellent question!!!!
Bob . . .
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