Nihon_Ni
Well Known Member
I've been working on the electrical architecture for my RV-8 and I'm getting close to a solution, but before I start buying and installing components, I'd like to get some feedback on my deign.
I'm planning an IFR-capable RV-8 with a Titan IO-370 and G3X system with G-5, GTN-650, GTR20, et al. I'm planning to use the Earth-X ETX680 battery as the main, and a TCW 3 Ah backup battery. The main alternator will be a belt-driven B&C BC-460H (60 Amps) with a gear-driven SD-8 backup (<8 Amps).
I've read Bob Nuckolls book several times and I'm sold on two alternator one battery set up he described in Z-13. My architecture is based on that, and only has minor changes such as, no battery buss fuse block, addition of avionics switch, dual P-mags, deletion of the low voltage package (G3X has that feature), and addition of a back-up battery. After talking with a pro in my chapter, I deleted Bob's fusable link leading to the alternator field CB, and just placed that CB on the main bus. I also removed the diode between the main bus and essential bus, because I inserted an avionics switch and didn't see the need for a diode there.
I've come up with a battery buss, main busses and endurance busses. The battery bus isn't really a bus, but a couple of items hooked to the battery. I didn't think there were enough things there to warrant a battery fuse block. Main Bus has been divided into three: MB1 is fuses, MB2 is circuit breakers, and MB3 is a planned expansion of an additional fuse block. I gave this block a load of 5 amps as a planning figure. I won't construct it, but I will have a place to put it in case I need it in the future. Essential Buss 1 is fuses, and EB2 is CBs. I've mostly used fuses, except for a few items where I want to be able to use the fuse as an alternate means of disconnecting power to an appliance.
I've worked tirelessly on my load analysis, and I think it's pretty solid. I've had to make some assumptions of appliance power requirements when I couldn't find the exact power requirements of a particular unit.
I've used the "Night IFR" load analysis for my continuous flow value, and "Typical Max" load as my intermittent flow value when doing my analysis for sizing wires, using figures 11-2 in AC 43.13 as a reference.
I welcome any comments, suggestion or critiques of my design.
Thanks for looking.
Rob
Edit: Please see the updated schematic before diving into this one. I solved some of the issues that people pointed out with the schematic below.
https://www.dropbox.com/s/nrmieqbdi9egavm/Electrical System Overview (v13.15).pdf?dl=0
I'm planning an IFR-capable RV-8 with a Titan IO-370 and G3X system with G-5, GTN-650, GTR20, et al. I'm planning to use the Earth-X ETX680 battery as the main, and a TCW 3 Ah backup battery. The main alternator will be a belt-driven B&C BC-460H (60 Amps) with a gear-driven SD-8 backup (<8 Amps).
I've read Bob Nuckolls book several times and I'm sold on two alternator one battery set up he described in Z-13. My architecture is based on that, and only has minor changes such as, no battery buss fuse block, addition of avionics switch, dual P-mags, deletion of the low voltage package (G3X has that feature), and addition of a back-up battery. After talking with a pro in my chapter, I deleted Bob's fusable link leading to the alternator field CB, and just placed that CB on the main bus. I also removed the diode between the main bus and essential bus, because I inserted an avionics switch and didn't see the need for a diode there.
I've come up with a battery buss, main busses and endurance busses. The battery bus isn't really a bus, but a couple of items hooked to the battery. I didn't think there were enough things there to warrant a battery fuse block. Main Bus has been divided into three: MB1 is fuses, MB2 is circuit breakers, and MB3 is a planned expansion of an additional fuse block. I gave this block a load of 5 amps as a planning figure. I won't construct it, but I will have a place to put it in case I need it in the future. Essential Buss 1 is fuses, and EB2 is CBs. I've mostly used fuses, except for a few items where I want to be able to use the fuse as an alternate means of disconnecting power to an appliance.
I've worked tirelessly on my load analysis, and I think it's pretty solid. I've had to make some assumptions of appliance power requirements when I couldn't find the exact power requirements of a particular unit.
I've used the "Night IFR" load analysis for my continuous flow value, and "Typical Max" load as my intermittent flow value when doing my analysis for sizing wires, using figures 11-2 in AC 43.13 as a reference.
I welcome any comments, suggestion or critiques of my design.
Thanks for looking.
Rob
Edit: Please see the updated schematic before diving into this one. I solved some of the issues that people pointed out with the schematic below.
https://www.dropbox.com/s/nrmieqbdi9egavm/Electrical System Overview (v13.15).pdf?dl=0
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