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dlm34077
Joined: 10 Feb 2007
Posts: 115
Location: AZ
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 Posted: Tue Aug 05, 2014 4:51 am Post subject: batteries |
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I initially installed two 680s in a modified box in the Vans location; each was in parallel with the other. I have two masters on the panel and can crank with either or both. I usually crank with both. I changed the two 680s at about 700TT. Early in its life I found that the original plan to use one of the rear 680s as avionics backup left something to be desired; namely a propensity towards aft CG on landing after a long trip. My friends always joke that I carry a machine shop in the baggage area (40# tools and 10# spare parts). I now have a 680 mounted on the firewall for an essential bus backup protected by 1/4 foam/aluminum insulation. The two rear 680s are connected to the primary bus. The primary bus contains the usual alternator B+ breakers, field breaker, the mundane breakers for strobes pitot heat, NAV lights, etc and an extra input for power to the backup EFIS and the Trutrak AP. The essential bus contains individual breakers for the SL30 COM and NAV sides, Trig transponder (mode S, ADSB out) Chelton EFIS, GRT Sport SX, ADSB receiver,etc. The busses can be connected via an avionics breaker or separated via a power diode. All appliances are powered directly from the bus and can be individually pulled or toggled OFF. I agree with Tim that the engine gets and stays very hot after shutdown and I am not adopting the Lithium battery solution, having been affected by the AD on lithium batteries in certified aircraft. The reason for my firewall battery is W/B as the CG moves aft with fuel burn. Voyager 4 flight planning software can be used to plan flights and see the effects of aft CG movement during flight due to fuel burn.
David McNeill
N46007 850TT
About 20 hours during the trip to AirVenture 2014
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Wed Aug 06, 2014 6:53 pm Post subject: Re: batteries |
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I have 925L/680 combo in the back. Limits the baggage a little. I actually like flying near the aft limit. My pitch trim gets very little use this way. We will switch to something lighter down the road after the other guys thoroughly test them. I have never hit the tail tie down, and I really take advantage of the aerodynamic braking.
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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Wayne G. |
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