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Ray Griffith
Joined: 03 Dec 2008
Posts: 7
Location: Albuquerque, NM
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 Posted: Wed Dec 19, 2012 7:15 am Post subject: Poor Man's Battery tester |
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Hay Bob what is up with the battery tester?
Ray
From: B. Ray Griffith (rgriffith(at)griffithes.com)
Sent: Tuesday, April 24, 2012 3:19 PM
To: AeroElectric-List(at)matronics.com (AeroElectric-List(at)matronics.com)
Subject: Poor Man's Battery tester
I built the poor mans tester Figure 2-4 in AeroElectric Connection. My only modification was I have three bulbs in parallel to simulate the load I have on the battery that I estimate at 11amps to run my fuel pump, ECU, and Ignition. The problem is when I connect the test to the battery and have all three bulbs on the tester kicks off at 13 volts with one bulb it kicks off about 10.5 Volts and with 2 bulbs it kicks off at 12 volts. I have rebuilt the unit with new 10v Zener and I get the same results. Does anyone have any suggestions what I have done wrong is do I need to change the resistor size between the load (bulbs)?
Thanks,
Ray
[quote][b]
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john.maccallum(at)bigpond
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| Posted: Wed Dec 19, 2012 1:58 pm Post subject: Poor Man's Battery tester |
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HI Ray
It’s because the load is not a constant current type. The batteries internal resistance (which varies with the state of charge) along with the connected load will determine the current flow. The amount of
current the Zener will have to sink to pull the output voltage down to 10.5 volts just adds to the problem. Unless you are willing to pay for or build a constant current type
Load device you will just have to average the current draw over a set period of time.
How long do you intend to test the battery for?
Cheers
John MacCallum
VH-DUU
RV 10 # 41016
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of B. Ray Griffith
Sent: Thursday, 20 December 2012 2:15 AM
To: AeroElectric-List(at)matronics.com
Subject: Re: Poor Man's Battery tester
Hay Bob what is up with the battery tester?
Ray
From: B. Ray Griffith (rgriffith(at)griffithes.com)
Sent: Tuesday, April 24, 2012 3:19 PM
To: AeroElectric-List(at)matronics.com (AeroElectric-List(at)matronics.com)
Subject: Poor Man's Battery tester
I built the poor mans tester Figure 2-4 in AeroElectric Connection. My only modification was I have three bulbs in parallel to simulate the load I have on the battery that I estimate at 11amps to run my fuel pump, ECU, and Ignition. The problem is when I connect the test to the battery and have all three bulbs on the tester kicks off at 13 volts with one bulb it kicks off about 10.5 Volts and with 2 bulbs it kicks off at 12 volts. I have rebuilt the unit with new 10v Zener and I get the same results. Does anyone have any suggestions what I have done wrong is do I need to change the resistor size between the load (bulbs)?
Thanks,
Ray
012345678901234567
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Wed Dec 19, 2012 6:16 pm Post subject: Poor Man's Battery tester |
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At 09:14 AM 12/19/2012, you wrote:
| Quote: | Hay Bob what is up with the battery tester?
Ray
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It's in process. The board is the same one used on
the new wig-wag controller. My software guy for this
program is the bottleneck. I'll be seeing him this
weekend and will get you an update. As soon as
I have some code to push into the chip, we'll
photograph it for an article and get it back to
you.
Bob . . .
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