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  • CQ Amateur Radio

    OUR READERS SAY…

    Sep 01, 2019 5 minutes

    More About Super Capacitors

    WA2NDM’s May “Math’s Notes” column on super capacitors as power sources continues to generate reader comment.

    Irwin,

    I just read your article on super capacitors in the May 2019 issue of CQ magazine. I’d like to mention that I’ve been using these devices as a battery replacement for years. I built up an array of a dozen 350-Farad, 2.7-volt, devices and have been using them instead of a lead-acid battery in my motorcycle for the last four or five years. I’m using Maxwell branded devices and their self-discharge is quite low. I can get a good 20 seconds of cranking a cold 650cc engine after sitting through the whole Iowa winter.

    My capacitor array is sized to (occupy) the same volume as the battery it replaces, yet it is

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