Need some help now working through my logic. When I run into issues of uncertainty I hyper focus until I resolve them. So I spent last night and this morning making a spreadsheet, doing some pivots and running amp tests in my garage.
Here's the crux of my issue, I have 10 items right now that are listed as needing 10 or greater circuit breaker. The problem being the VPX pro only has 9 10-15A pins available. So I need to shed one of the big ones listed below, somewhat in order of importance;
- GTN 650 Comm 8A (Has to use a 10)
- GTN 650 Nav 10A
- Comm#2 8A (using a 10)
- Pitot/AOA 15A
- Boost Pump 10A
- Strobes 15A (Might be able to use a 10A)
- Landing Light Left 10A
- Landing Light Right 10A
- IBBS 10A
- AccBlock 15A
I can't really touch the GTN, the GTR 20 (Comm#2), Pitot or Boost pump.
Getting into the lights the Strobes use a 10-15, I'll go with a 15 and walk it down if I can in the VPX. But AeroLED manual basically says give 5A to each light, 2 wings and 1 tail. Each Landing light is drawing 5.20 per my test in the garage. I really want the VPX to control Wig-Wag/Recog for the Vspeed feature so each light needs a 10A pin. Changing this would free up several pins but then recog becomes a manual process. It's doable just want to avoid it.
Here are the two items I think I can mess with, the IBBS and my accessory block. Now the IBBS utilizes a 10A pin for essentially charging since I'm not doing any pass-through power. That being the case would it make sense to add this to the 15A accessory block and use a 10A fuse blade?
The accessory block is a 12 place fuseblock that I'm hanging a bunch of random stuff off. For the most part low power items like oil damper, cowl flaps and things of that nature. The only items that could potentially max out the amps are the USB ports. I ran a test, seems an iphone uses about .7A and an Ipad uses about .9A, so if I had 4 Ipads plugged in I'm pushing about 3.6A. If I had 4 devices plugged into all the USBs at once with power, all while working the cowl flaps, ram air, oil damper and all the lights on... So 15A might be over kill here. Maybe I make this a 5A and control what's getting plugged into the USBs and when.
My other thought is hang the two USB chargers off the Pass-through power on the IBBS, this would allow me to easily make the AccBlock a 5A circuit.
So I guess what it comes down to is do I put the IBBS on the AccBlock or do I work through the reduction in Accblock size by pushing some stuff through the IBBS pass-through? (Leaning heavily towards putting the two dual USB Chargers off the IBBS Pass-through)