battery question

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  • iop65
    Senior Member
    • Mar 2013
    • 367

    #46
    So he just has to connect about 50 of those caps on his esc and problem is solved😉

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    • NativePaul
      Greased Weasel
      • Feb 2008
      • 2760

      #47
      OOPS, double post.
      Last edited by NativePaul; 08-31-2017, 01:42 PM.
      Paul Upton-Taylor, Greased Weasel Racing.

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      • NativePaul
        Greased Weasel
        • Feb 2008
        • 2760

        #48
        Indeed, but simplifying it with 1 farad may be a little too much. I know of no 1 farad ultra low ESR caps, and as you would need 833 of the 1200uf caps that castle include on their 200A ECSs to make 1 Farad, finding room for 50 farads worth (over 40,000 of them) may be problematic for the average FE boat.

        My guess is that it wouldnt be worth the weight, when (assuming a castle 200 ESC with no external cap bank) batteries seem capable of supplying 99.98333% of that peak energy reasonably well at the moment.

        The small amount of capacitance we can realisticly add is an irrelivance in terms of a power boost for the big current spikes, and will make no noticable or measurable diffference to RPM.
        Paul Upton-Taylor, Greased Weasel Racing.

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        • CraigP
          Fast Electric Addict!
          • May 2017
          • 1464

          #49
          The capacitance is working on the amp spikes and the sudden volt change it produces. It provides the energy just long enough so the wires can recover from their inductance. So this is happening in the uS time frame, not seconds. But it only takes a voltage excursion beyond the ESC rating for 1/2 a uS to smoke the ESC. A uS is one millionth of a second! Bad things can happen in incredibly fast time frames...

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          • NativePaul
            Greased Weasel
            • Feb 2008
            • 2760

            #50
            That is correct, but what you said earlier and I was responding to and quoted you on above with talks about a very different time frame "0.5-0.8 seconds".
            Paul Upton-Taylor, Greased Weasel Racing.

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            • wrathfulcapped
              Junior Member
              • Aug 2018
              • 3

              #51
              Are you ever tried with portable solar panels which include batteries? Try them out as I was facing the same problem in my farm, that batteries were dying soon due to rain.

              Comment

              • Jesse J
                scale FE racer
                • Aug 2008
                • 7116

                #52
                Originally posted by wrathfulcapped
                Are you ever tried with portable solar panels which include batteries? Try them out as I was facing the same problem in my farm, that batteries were dying soon due to rain.
                What kind of solar panels would you recommend?
                "Look good doin' it"
                See the fleet

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