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  #1  
Old 05-12-2017, 12:00 AM
b1driver b1driver is offline
 
Join Date: Nov 2005
Location: Miramar, FL
Posts: 99
Default EFII Amp Draw

Has anyone got any good numbers on how many AMPS a single ECU and Coil draws at peak. Im trying to figure out my backup source of power and leaning towards a TCW battery (3 AMP hours version). I like this approach because of the automatic switching it offers should I have an issue with the main source of power. I know that EFII claims 1.1 AMPS at 2500 RPM but I was looking for in the field numbers out there since the ECU requires a 5 AMP breaker and the coils require 10 AMPS. Thanks a ton ahead of time for any info.
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  #2  
Old 05-12-2017, 04:07 AM
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rmartingt rmartingt is offline
 
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Location: Savannah, GA
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Are you also using the fuel injection portion? If so you'll also have to account for a fuel pump. The SDS EM-5 install says:

Quote:
Current draw of the pump, ECU, injectors and coils would be around 7.5 to 10 amps. An 8 amp/hour battery should give you a solid 30 minutes of flight time, just running the engine electrics. An 18 amp/hour one, around 1 hour. We want to be able to sustain at least 10 volts to the electrics.
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  #3  
Old 05-12-2017, 05:56 AM
madhun madhun is offline
 
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Location: Buderim, Queensland Australia
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I'm curious given the weight, wiring complexity and cost why more folks don't opt for a secondary alternator, B&C for example?
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  #4  
Old 05-12-2017, 06:08 AM
219PB 219PB is offline
 
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Location: Victoria, Tx
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I installed the second B&C alternator, 30 amps. I also have a second EarthX battery.
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  #5  
Old 05-12-2017, 06:49 AM
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rmartingt rmartingt is offline
 
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Quote:
Originally Posted by 219PB View Post
I installed the second B&C alternator, 30 amps. I also have a second EarthX battery.
That is my plan as well. I'm planning to eventually be IFR capable, so I wanted that redundancy. I figure it would also give me enough redundancy that I could fly day VFR with one battery or one alternator inop, at least to get back home.
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  #6  
Old 05-12-2017, 07:30 AM
crabandy crabandy is offline
 
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Location: Ottawa, Ks
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I can probably get a good estimate on my next flight if I remember.

My EBUS/Batt Bus pulls about 7 amps with a full dual EFII ignition no fuel, dual screen G3X and a MidContinent SAM backup EFIS. The Aeroelectric Z-13 with the SD8 worked as advertised, It made my real main alt failure a non-event on a long cross country.
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  #7  
Old 05-12-2017, 09:10 AM
b1driver b1driver is offline
 
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Location: Miramar, FL
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No fuel injection, just a dual ignition of which I'm trying to use a tcw 3 amh backup battery to give me enough juice to find a surface to land on. Thanks Crabandy, I followed Z-13 as best I could but I also went with the EFII bat bus option. I just want something to automatically kick in should the bat bus and the backup alt fail.
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  #8  
Old 05-12-2017, 11:10 AM
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rcpaisley rcpaisley is offline
 
Join Date: Jan 2008
Location: Upland, CA
Posts: 286
Default EIGN-4-1 current draw

Hi Luis,
The EIGN-4-1 system draws an average current of 1.2A at high rpm.
The breaker values are short circuit protection.

Robert
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