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peter(at)sportingaero.com
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 Posted: Sun Jan 18, 2009 12:51 pm Post subject: GT-50 G-meter installation |
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Hi,
I’m installing a GT-50 G-meter in my airplane, my question is does anyone have one of these devices and have you switched it’s power supply, or do you leave it on all the time?
The airplane is aerobatic has only an SD-8 topping up a 17ah PC680 battery. The installation instructions suggest that the GT-50 is connected to straight to the battery to keep the clock counting, it is suggested that as the current draw is so low it will never flatten the battery. Today I measured the current draw which is about 6 mA, so the clock will draw about an amp hour per week (if my multi-meter is accurate). So, assuming the battery is charged to 80% when I close the hangar door, the clock will flatten the battery in 3 months. But how long will it take before the battery does not have sufficient charge to start the engine (O-360 Lycoming)?
I expect that most flights will be 20 or 30 minutes so may only just replace what is use for starting, if I haven’t flown for several weeks will I find that the battery just can’t cope with losing an ah a week plus starting the engine? I don’t expect the current drain when flying to be high, EIS-4000, Becker radio and Garmin transponder and GPS Pilot III GPS will draw perhaps 2A, but if I forget to switch off the electric fuel pump there could be only 2 or 3A available for battery charging. So should I switch the power to the GT-50 and accept that I will have to re-set the clock?
If anyone has any real world experience I would be interested to hear from you.
Regards, Peter
[quote][b]
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JohnInReno
Joined: 08 Sep 2007
Posts: 150
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| Posted: Sun Jan 18, 2009 1:46 pm Post subject: GT-50 G-meter installation |
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Why not just hard-wire the connector for a battery maintainer? Bob has tested several and the Schumacker brand at Walmart was as good as any.
John Morgensen
Peter Pengilly wrote: [quote]
Hi,
I’m installing a GT-50 G-meter in my airplane, my question is does anyone have one of these devices and have you switched it’s power supply, or do you leave it on all the time?
The airplane is aerobatic has only an SD-8 topping up a 17ah PC680 battery. The installation instructions suggest that the GT-50 is connected to straight to the battery to keep the clock counting, it is suggested that as the current draw is so low it will never flatten the battery. Today I measured the current draw which is about 6 mA, so the clock will draw about an amp hour per week (if my multi-meter is accurate). So, assuming the battery is charged to 80% when I close the hangar door, the clock will flatten the battery in 3 months. But how long will it take before the battery does not have sufficient charge to start the engine (O-360 Lycoming)?
I expect that most flights will be 20 or 30 minutes so may only just replace what is use for starting, if I haven’t flown for several weeks will I find that the battery just can’t cope with losing an ah a week plus starting the engine? I don’t expect the current drain when flying to be high, EIS-4000, Becker radio and Garmin transponder and GPS Pilot III GPS will draw perhaps 2A, but if I forget to switch off the electric fuel pump there could be only 2 or 3A available for battery charging. So should I switch the power to the GT-50 and accept that I will have to re-set the clock?
If anyone has any real world experience I would be interested to hear from you.
Regards, Peter
| Quote: |
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
|
[b]
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_________________
John Morgensen
RV-9A - Born on July 3, 2013
RV4 - for sale |
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peter(at)sportingaero.com
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| Posted: Sun Jan 18, 2009 2:19 pm Post subject: GT-50 G-meter installation |
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Hi John, I’m unlikely to have power in the hangar. Peter
-----Original Message-----
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of John Morgensen
Sent: 18 January 2009 21:45
To: aeroelectric-list(at)matronics.com
Subject: Re: AeroElectric-List: GT-50 G-meter installation
Why not just hard-wire the connector for a battery maintainer? Bob has tested several and the Schumacker brand at Walmart was as good as any.
John Morgensen
Peter Pengilly wrote:
Hi,
I’m installing a GT-50 G-meter in my airplane, my question is does anyone have one of these devices and have you switched it’s power supply, or do you leave it on all the time?
The airplane is aerobatic has only an SD-8 topping up a 17ah PC680 battery. The installation instructions suggest that the GT-50 is connected to straight to the battery to keep the clock counting, it is suggested that as the current draw is so low it will never flatten the battery. Today I measured the current draw which is about 6 mA, so the clock will draw about an amp hour per week (if my multi-meter is accurate). So, assuming the battery is charged to 80% when I close the hangar door, the clock will flatten the battery in 3 months. But how long will it take before the battery does not have sufficient charge to start the engine (O-360 Lycoming)?
I expect that most flights will be 20 or 30 minutes so may only just replace what is use for starting, if I haven’t flown for several weeks will I find that the battery just can’t cope with losing an ah a week plus starting the engine? I don’t expect the current drain when flying to be high, EIS-4000, Becker radio and Garmin transponder and GPS Pilot III GPS will draw perhaps 2A, but if I forget to switch off the electric fuel pump there could be only 2 or 3A available for battery charging. So should I switch the power to the GT-50 and accept that I will have to re-set the clock?
If anyone has any real world experience I would be interested to hear from you.
Regards, Peter | Quote: | | href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List href="http://forums.matronics.com">http://forums.matronics.com href="http://www.matronics.com/contribution">http://www.matronics.com/contribution |
[quote] http://www.matronics.com/Navigator?AeroElectric-Listhttp://forums.matronics.comhttp://www.matronics.com/contribution [b]
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