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Old 03-11-2023, 07:12 PM
Woodliness Woodliness is offline
Join Date: Aug 2020
Location: Piperton TN
Posts: 13
Default Rv-10 start up and 1st flight

We are finishing up our RV-10 build. We decided to go with the 2 earth x batteries and a back up alternator. My question is on start up and flight do you turn both batteries on and in-flight do you leave on both alternators?
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Old 03-11-2023, 07:52 PM
Richard Connell Richard Connell is online now
Join Date: Aug 2006
Location: Sydney Australia
Posts: 492

Might need a bit more info.
Who designed and built your electrical system?
Got a schematic?
RV7 VH-XRC Sold :-(
Sydney, AUS
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Old 03-11-2023, 08:28 PM
Shays Shays is offline
Join Date: Dec 2018
Location: Aurora CO
Posts: 53

I personally have both batteries on and both alternators on.
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Old 03-11-2023, 08:37 PM
rocketman1988 rocketman1988 is offline
Join Date: Jun 2010
Location: Sunman, IN
Posts: 3,362
Default Start

I am using a split bus system. I use both batteries in parallel to start, open the crosstie, enable both alternators. Works great.
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Aerospace Engineer '88

In Paint at Evoke!
Garmin G3X-T, Barrett EFII S32, CAI, MTV-9B

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Old 03-11-2023, 08:40 PM
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dmattmul dmattmul is offline
Join Date: Dec 2015
Location: Spring Hill, FL
Posts: 639
Default Start battery

I can choice what battery I want to use for start 1, 2 or both. In flight both are used. Depends on your design, would need to see schematic.
RV-14A QB builds (2017), Lycoming 390 Thunderbolt arrived July 2019, Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 300-72, Earth-X batteries, Beringer wheels and brakes, Parts became real airplane 8/15/2020. Started RV-10 Nov 2020. Empennage arrived (Built) Working on QB kits. Garmin avionics, Vertical Power, EFII-32 Ignition and Fuel, Whirlwind 3 blade HRT 378, Earth-X batteries, Beringer wheels and brakes, real airplane hopefully early-mid 2024. Paid subscriber
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Old 03-12-2023, 07:52 AM
N427EF N427EF is offline
Join Date: Oct 2005
Posts: 1,728
Default Both on

I have two batteries and 2 alternator (one is a generator)
Both batteries on for starting. If you have two batteries you might as well take advantage of the situation and give your starter all the juice it wants.
Like the other posters have mentioned, I can start it on one battery or both.
Same for the alternators, they are both on at all times and the back up unit will start generating if the bus voltage drops below 13V.
Ernst Freitag
RV-8 finished (sold)
RV-10 IO-540 8.5:1
Running on 91 Octane E10 mogas since 2011
The older I get, the better I used to be.
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