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  #1  
Old 01-11-2022, 04:13 PM
BOHICA BOHICA is offline
 
Join Date: Oct 2020
Location: Austin
Posts: 75
Default Alternator Load Analysis

Anyone done/have a load analysis for their plane? My analysis looks ok for a 60A alternator for continuous flight.
60A x80% = 48A continuous load target. Stay less that this all good.

Kicker is Night flight landing with Pitot heat on puts me at or above 60A with what I am calculating for continuous load. I am looking at using FlyLED Seven Stars for lights @ 7.5A ea, 15A Total. Garmin GAP 26 Pitot heat is 12A Max (varies with temp). So up to a 27A night landing adder. Lights don't fall under my continuous load but exceeding max current draw for alternator would be an issue.

General System Spec
Dual G3X
650xi or 750xi
GMC 507 Auto Pilot dual axis
GMA 245 Audio Panel
GTR 20 Comm
+Supporting bits.

Just trying to figure out what people are seeing for loads on similar setups and what calculations where done beforehand.
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Rick
2021 Donation Made
RV-14A 140892 building
QB expected Arrival Aug-Oct 2022
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  #2  
Old 01-11-2022, 06:02 PM
JHartline JHartline is offline
 
Join Date: Dec 2012
Location: Carrollton, GA 5GA2
Posts: 292
Default My real-world results are much lower

I have similar Garmin equipment, with 3-axis AP and unregulated pitot heater. LED lights all around. With everything operating I see 16-18 amps. I donít recall seeing higher than that except right after starting with a less-than-optimal battery charge. Hope that helps.
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James Hartline
Carrollton, GA 5GA2
RV-14 - First flight 4/7/2019. Phase I complete as of 9/11/2019!!
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  #3  
Old 01-11-2022, 06:05 PM
Jetmart's Avatar
Jetmart Jetmart is offline
 
Join Date: Sep 2019
Location: Windsor, Ontario
Posts: 467
Default

This is what I came up when planning, Actual ended up being 15 - 18 amps in cruise with wig-wag lights on, strobes, all avionics, and without pitot heat on.
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Glenn Martin
Windsor, Ontario
1941 Tiger Moth
2017 Waco YMF-5
RV-14 Kit # 140694 - First Flight June 22, 2021
2022 Dues Paid

Last edited by Jetmart : 01-11-2022 at 06:08 PM.
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  #4  
Old 01-11-2022, 07:13 PM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 817
Default

Here's mine for a RV-7 with a 60A alternator.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring and Avionics harness completed 9/2/2021
FWF Started 9/3/2021

Donated for 2021 and so should you
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  #5  
Old 01-11-2022, 07:31 PM
rocketman1988 rocketman1988 is online now
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,821
Default

Quote:
Originally Posted by BOHICA View Post
Anyone done/have a load analysis for their plane? My analysis looks ok for a 60A alternator for continuous flight.
60A x80% = 48A continuous load target. Stay less that this all good.

Kicker is Night flight landing with Pitot heat on puts me at or above 60A with what I am calculating for continuous load. I am looking at using FlyLED Seven Stars for lights @ 7.5A ea, 15A Total. Garmin GAP 26 Pitot heat is 12A Max (varies with temp). So up to a 27A night landing adder. Lights don't fall under my continuous load but exceeding max current draw for alternator would be an issue.

General System Spec
Dual G3X
650xi or 750xi
GMC 507 Auto Pilot dual axis
GMA 245 Audio Panel
GTR 20 Comm
+Supporting bits.

Just trying to figure out what people are seeing for loads on similar setups and what calculations where done beforehand.
Dual G3X
G5
GTN650
GTX45R
GMC507
GDL51R
GMA245
Regulated GAP26
2- Baja Design Squadron Pro @ 5 amps each
AeroLED Pulsar 180s +Suntail
2-FlyLeds singles @ 1 amp each
2-FlyLeds duals @ 2 amps each

With everything ON I see about 27 amps continuous; when the strobes flash, add +15 for a total of 42 amps momentarily...
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Bob
Aerospace Engineer '88

RV-10
N464RL

Dues+ Paid 2021,...Thanks DR+
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  #6  
Old 01-12-2022, 08:04 AM
BOHICA BOHICA is offline
 
Join Date: Oct 2020
Location: Austin
Posts: 75
Default

Quote:
Originally Posted by mfleming View Post
Here's mine for a RV-7 with a 60A alternator.
Any chance of getting your spreadsheet. I like the level of detail.
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Rick
2021 Donation Made
RV-14A 140892 building
QB expected Arrival Aug-Oct 2022
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  #7  
Old 01-12-2022, 08:06 AM
BOHICA BOHICA is offline
 
Join Date: Oct 2020
Location: Austin
Posts: 75
Default

Some good info here on this topic. I will work into my spreadsheet then might become a good item for WIKI. If on the WIKI could be updated with more items and make a selectable tool for determining your load. Give me something to do while I wait for QB Fuse/Wings.
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Rick
2021 Donation Made
RV-14A 140892 building
QB expected Arrival Aug-Oct 2022
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  #8  
Old 01-13-2022, 12:35 PM
Jumpbat74 Jumpbat74 is offline
 
Join Date: May 2019
Location: Portland OR
Posts: 9
Default

Love that idea Rick.. That detailed spreadsheet is a nice bit of work!
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2022 Donation Made!
RV-14A
Emp- done
Fuse- done
Finish- done
Engine- mounted
FWF- IN PROGRESS
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  #9  
Old 01-13-2022, 04:54 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 817
Default

Quote:
Originally Posted by BOHICA View Post
Any chance of getting your spreadsheet. I like the level of detail.
Sent you a PM
__________________
Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring and Avionics harness completed 9/2/2021
FWF Started 9/3/2021

Donated for 2021 and so should you
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  #10  
Old 01-13-2022, 07:59 PM
KiloFoxtrot's Avatar
KiloFoxtrot KiloFoxtrot is offline
 
Join Date: Oct 2007
Location: IL
Posts: 80
Default

Quote:
Originally Posted by mfleming View Post
Here's mine for a RV-7 with a 60A alternator.
Michael,
Nice Work.
It really is a nicely detailed spreadsheet I wouldn't mind using as well. It is electrical and avionics for the winter.
Any chance to get a copy?
Thank you in advance!
Ken
__________________
RV7A tip up
Superior IO-360-M1S Aerosport build school=Excellent. See post: Engine build school pictures IO-360
Tail / Fuse / Wings are complete + painted. I used Sherwin Williams JetGlo solids and AcryGlo metalics.
Leather seats by Flightline Interiors.
Still to do: Firewall forward, cowling fit and paint, G3X avionics.
FLY
Dues Paid
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