WattFlyer RC Electric Flight Forums - Discuss radio control eflight

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-   Power Systems (https://www.wattflyer.com/forums/forumdisplay.php?f=17)
-   -   CAP PACK/Capacitor pack (https://www.wattflyer.com/forums/showthread.php?t=80570)

dasintex 01-22-2020 02:47 AM

CAP PACK/Capacitor pack
Twin Motor Plane 'Twin Otter', going to run 12" extensions from 4S 4500 MaH Lipo Battery in Fuselage to 60 AMP ESC's in Motor Pods/Mounts, going use Castle Creation CAP PACK next to ESC's


Instructions for CAP PACK states for use with 8 inch extensions only, any problems stretching that out to 12 inches

ron_van_sommeren 01-22-2020 01:23 PM

Best electrical solution: battery packs in the nacelles or wings. Lowest resistance in battery and motor wires, lowest inductance in battery wires.
Second best: controllers in fuselage, near battery. Lowest battery wire inductance.

Too long wires batteryside will kill ESC over time: precautions, solutions & workarounds - RCG
  • Two problems
    ◦ Voltage spikes higher than battery voltage: transistor/FET/chip breakdown.
    ◦ Current through input capacitors too high: overheating/popping/exploding.
  • Example https://static.rcgroups.net/forums/i...lies/frown.gif four costly controllers consecutively cremated
  • Solution I: simply lengthen the motor wires instead https://static.rcgroups.net/forums/i...lies/smile.gif
  • Solution II: add extra capacitors, rules of thumb
    Calculation spreadsheet
  • Capacitor type and polarity/orientation!
  • How & where (not) to add extra capacitors.
    As close to or on controller.
  • DIY capacitor pack pictures
  • Capacitor & pack suppliers
  • Expert/manufacturer opinions & their rules of thumb
    They all say the same ... noise_reduction_101, switching_power_supply_design_101.
  • Cause, explanation, water hammer/knock analogy&video, theory
  • Measurements & scope traces

dasintex 01-22-2020 01:32 PM

Appreciate the reply, I just assumed the ESC had to be next to the Motors, in my case the Battery has no choice but to be in the fuselage which means using about 12" extensions to the ESCs, extending the Motor Wires from the ESCs to the Motors a nice solution instead of the expense of Capacitor Packs

ron_van_sommeren 01-22-2020 02:05 PM

Just make sure the ESCs gets (moving) cooling air in the fuselage.

More reading, LiPo best care practices

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