|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

02-22-2016, 05:19 AM
|
 |
|
|
Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
|
|
Is there a voltage drop across the shunt? I hope NOT! there should not be more than .1 V drop per connection, .2 for battery terminals in any circuit.....
__________________
7A Slider, EFII Angle 360, CS, SJ.
|

02-22-2016, 07:32 AM
|
 |
|
|
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
|
|
Quote:
Originally Posted by bret
Is there a voltage drop across the shunt? I hope NOT! there should not be more than .1 V drop per connection, .2 for battery terminals in any circuit.....
|
Yes there is - that's the point of the shunt, it's how they measure the amperage flowing across it - but it's a small voltage drop, at one millivolt per amp. If you are flowing 30 amps through the shunt, the voltage drop across it is .03 volts. For our purposes it really wouldn't matter which side of the shunt you used for a system voltage tap, but on mine I used the battery side of the shunt.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
|

02-22-2016, 07:50 AM
|
 |
|
|
Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
|
|
Quote:
Originally Posted by airguy
Yes there is - that's the point of the shunt, it's how they measure the amperage flowing across it - but it's a small voltage drop, at one millivolt per amp. If you are flowing 30 amps through the shunt, the voltage drop across it is .03 volts. For our purposes it really wouldn't matter which side of the shunt you used for a system voltage tap, but on mine I used the battery side of the shunt.
|
That is good info, I did not even think about that.......now I need to go back and look at my wiring......
__________________
7A Slider, EFII Angle 360, CS, SJ.
|

02-22-2016, 07:54 AM
|
|
|
|
Join Date: Nov 2012
Location: Cincinnati,Ohio KHAO
Posts: 128
|
|
Starter?
Greg Does your shunt happen to measure the starter current too? Always wanted to know the inrush at initial rotation. Have heard anywhere from 400Amps to 150Amps.. John
__________________
John R Prince
RV-7 want-a-b
Dues Paid for 20
|

02-22-2016, 08:01 AM
|
 |
|
|
Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
|
|
Dynon says not to put it inline with the starter, but there are three other locations for the install.
__________________
7A Slider, EFII Angle 360, CS, SJ.
|

02-22-2016, 08:08 AM
|
 |
|
|
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
|
|
No, I don't measure the starter current. I have my shunt set to measure the total current in/out of the battery (other than the starter) to measure a true charge/discharge scenario, after alternator corrections. So if I'm consuming 23 amps of power but the alternator is handling all of it, I'll show 0 amps on the shunt.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
|

02-22-2016, 08:12 AM
|
|
|
|
Join Date: Nov 2012
Location: Cincinnati,Ohio KHAO
Posts: 128
|
|
Starter?
Yep, a Dynon might not like the kickback voltage along with if there
was a loose connection on the shunt with full 14 volts applied to input.
John
__________________
John R Prince
RV-7 want-a-b
Dues Paid for 20
|

02-22-2016, 05:08 PM
|
|
|
|
Join Date: Jan 2013
Location: Greensboro, NC
Posts: 173
|
|
I do have the shunt to measure amps also. For volts I connected to a miscellaneous buss from the VP-X. Seems the main interest in voltage is to know if the voltage regulator has run amuck so you can shut down the alternator before everything gets fried.
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 02:02 AM.
|