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Old 03-17-2018, 03:29 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,814
Default How to mount two batteries

There seems to be many builders interested in a two battery power distribution design, but get tripped up on how/where to mount the batteries.

I just completed the mounts for two PC-625 batteries in my new project. I used a similarly equipped flying RV-8 W&B as the data to calculate the new W&B for one battery mounted in the forward baggage well, and one battery mounted in the standard spot aft of the baggage compartment. For a standard IO-360-M1B engine and a Hartzell BA CS prop, the W&B comes out just about perfect (better than one battery forward or one battery aft).

Both battery trays are modified from stock Van's trays.

If anyone is interested, PM me your email address and I'll provide battery mounting photos and wiring instructions.

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Old 03-17-2018, 09:56 PM
VA Maule VA Maule is offline
Join Date: Apr 2016
Location: Bucking ham, Virginia
Posts: 143

Sent you a PM
Maule MXT-7(daily flyer)
Lancer 235(partner)
Raidial RV-8R Ephanage Done, Wings Done, Fuselage on it's tall Grove gear & engine hung
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Old 04-04-2018, 09:03 AM
FlyGood FlyGood is offline
Join Date: Dec 2009
Location: League City, TX
Posts: 14


I'd like to see pictures of the forward battery tray and your wiring diagram. Email is:


Ken Cockrell
RV-8 Fuselage Slow-Build In-work; on gear
Tail Kit complete
Wings In-work
N247TM Reserved
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Old 04-05-2018, 08:32 AM
Robert Anglin Robert Anglin is offline
Join Date: Mar 2008
Location: houston, texas
Posts: 900
Default You can.

We installed two 680's in the back location, by just stretching out the factory battery box. Then ran two cables up to the right kick panel where we put a Blue Sea splitter switch. Worked very well. But we had a very light prop and engine with a light airframe of only 1008 Lbs., so we moved to a one battery on the fire wall as in the plans, to get full use of the C.G. and weight loading limits. Hope this helps. Yours, R.E.A. III # 80888
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