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Thread: Back-up Battery Charging Source

  1. #1

    Back-up Battery Charging Source

    Is the back-up battery charged by the EFIS system or from ship power?

    Depending on the answer to the above, if I have 3 back-up batteries (1 per EFIS Screen) can they be powered by the same circuit?

    I will be taking delivery of my AFS soon, but I am trying to configure my VPX-Pro and have run out of available pins. If the back-up batteries can all be powered by the same circuit then I will be saved!

  2. #2
    Quote Originally Posted by bendun View Post
    Is the back-up battery charged by the EFIS system or from ship power?

    Depending on the answer to the above, if I have 3 back-up batteries (1 per EFIS Screen) can they be powered by the same circuit?

    I will be taking delivery of my AFS soon, but I am trying to configure my VPX-Pro and have run out of available pins. If the back-up batteries can all be powered by the same circuit then I will be saved!
    The EFIS does not charge the backup battery.
    Rob Hickman
    Advanced Flight Systems Inc.

  3. #3
    Is there any reason why I should NOT wire all 3 to the same circuit on the VPX?

  4. #4
    Quote Originally Posted by bendun View Post
    Is there any reason why I should NOT wire all 3 to the same circuit on the VPX?
    If one shorts out it will take all three out.
    Rob Hickman
    Advanced Flight Systems Inc.

  5. #5
    If they did, won't I still have 3 fully charged batteries? You only get so many pins on a VPX-Pro and I don't have 3 extra to devote to charging batteries. From what I can gather, this is probably a pretty common dilemma for folks who want a "glass cockpit".

    Rob, you are the Pro here, what would you do?

  6. #6
    I would power the EFIS and battery charge circuit from the same VPX Power pin. The TCW battery charge can take 3 1/2 Amps and the EFIS is 3 1/2 Amps so it will need to be on a 8 amp circuit.

    VPX Power Pin ---->------ EFIS Pin 1 + Pin 15
    |
    --- TCW Pin 1 + Pin 6
    Rob Hickman
    Advanced Flight Systems Inc.

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