Wayne, can you start the engine with the 680? Its cranking amps appear sufficient to crank the 6 cyl. I've put 2 680's in, for a dual bus system, with cross tie, but have not run the engine yet.
thanks,
Bill
Mike,
I would use 925L if going with one battery as this battery has the desired capacity for our long wire run and IO-540 combination. If you go with two 680's then you will be able to start on a fully charged battery and may be fine unless you have no preheat and temps below 30F. Then you close crossfeed contactor and leave sensitive avionics off for startup. I decided to go with 925L with 680 aux as opposed to just a EFIS backup so that entire panel could be powered up for at least 1.5 hours. The extra weight back there makes it unnecessary to carry any ballast during solo flight. I have BA 2-Blade prop and no air conditioning which gives me plenty of nose weight, so I like having the extra 23-25 lbs back there for w&b. I inst 680 to right and below 925L battery opposite ap pitch servo and sorry no pics.
Okay, now I'm confused. I am right at the point in my tailcone build at which I build the battery tray. Bob, I've seen that you modified your battery tray to carry two batts. Vans seems to think one 680 is enough, as the tray is designed for that. Okay, here are my "dumb questions":
1) I would like a complete IFR panel. Is one 680 battery enough?
2) Will a 925 fit in the standard batt tray, built per the instructions?
3) I read that the 925 can behave as two batteries (whatever that means). If one 680 isn't sufficient, is one 925 enough?
4) Is there an "aftermarket replacement" for the standard Vans batt tray that fits a 925 and/or two batteries, or is a home made modification necessary?
Okay, now I'm confused. I am right at the point in my tailcone build at which I build the battery tray. Bob, I've seen that you modified your battery tray to carry two batts. Vans seems to think one 680 is enough, as the tray is designed for that. Okay, here are my "dumb questions":
1) I would like a complete IFR panel. Is one 680 battery enough?
2) Will a 925 fit in the standard batt tray, built per the instructions?
3) I read that the 925 can behave as two batteries (whatever that means). If one 680 isn't sufficient, is one 925 enough?
4) Is there an "aftermarket replacement" for the standard Vans batt tray that fits a 925 and/or two batteries, or is a home made modification necessary?
Im in process working out details to retro mount battery No2 in the RV10. I need wiring diagram for adding this battery as backup and for cold starts. help is requested. Thanks many times, Stokes
Bob thank you for your thoughts. I saw on your log how you enlarged the tray and that is what I plan to do also.
I plan the battery for extra cold cranking amps, and stand by for instruments thats all.
No Ebus, just the standard bus per Vans plan and basic circuitry AFS EFIS, trutrak, garmin, xponder, lights, starter etc.
One alternator to charge both batteries and I can see Ill need another relay switch.
I looked at Z14 and I think that will work for me, but Im still not sure of the circuits for #2 to starter and alternator and how to switch #2 into the panel circuit if needed. Im using an idiot light to signal alternator failure, and battery status volts from the EFIS. I want #2 to service the panel only if needed.
Im trying to keep it simple enough for me to understand, and not add on a bunch of boxes.
Your log is excellent and a joy to browse and thanks for taking so much time to post it. Stokes
My Rocket has a IO540 with the NL starter, and a PC680 starts it just fine. 2 years and it is still going strong.
I bought my RV-10 and it has an Odyssey 1200 installed, a little overkill but cranks right up, even after leaving the master switch on overnight! The downside is it weighs 38.2 pounds so with 4 people and luggage, I am aft cg limited so have to keep minimum fuel for landing. However, no ballast needed when solo
I am probably going to get a PC925 or PC680 to swap in for family trips so I can carry more luggage (with my family, currently limited to 65 pounds in baggage compartment with 14 gallons min fuel). Easy way to adjust CG for different missions ... sort of like helicopters with their movable battery trays...
No Ebus, just the standard bus per Vans plan and basic circuitry AFS EFIS, trutrak, garmin, xponder, lights, starter etc.
One alternator to charge both batteries and I can see Ill need another relay switch.
I looked at Z14 and I think that will work for me, but Im still not sure of the circuits for #2 to starter and alternator and how to switch #2 into the panel circuit if needed. Im using an idiot light to signal alternator failure, and battery status volts from the EFIS. I want #2 to service the panel only if needed.
Im trying to keep it simple enough for me to understand, and not add on a bunch of boxes. Stokes
How about a single alternator airplane with electrically
dependent engine and flight instruments? If the alternator
quits, one might wish to assign batteries to Task 1
(engine) and Task 2 (instruments/communication). In this
case, the two suites of hardware are powered from their
own battery busses. Contactors that parallel the batteries
to the main bus are simply opened. The main bus goes
dark and system components that depend on battery
power enjoy separate, isolated sources.
Planning the wiring for my -10 build currently. Will have dual batteries on a modified tray in the back.
Would anyone care to share pics of their crossfeed contactor install and/schematics?
I'm using the Bob K Z-14 dual batt - dual alternator - dual buss scheme as the foundation.
thank you.
Bob,There should be some photos on my build site. I have dual PC680s, two busses, but I have a VPX instead of a Knuckoll's design.
Bob,
I can see that you have the crossfeed contactor on the right side of your batt tray and the dual batt relays on the left. Do you have the crossfeed contactor on its own switch to select for starting or in the event of primary alt failure? Also, are you running dual 2agw wires up the left side of the fuse to the starter contactor?
Thank you.
Z-14 Battery PicsPlanning the wiring for my -10 build currently. Will have dual batteries on a modified tray in the back.
Would anyone care to share pics of their crossfeed contactor install and/schematics?
I'm using the Bob K Z-14 dual batt - dual alternator - dual buss scheme as the foundation.
thank you.