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Playing with my new higher power weed zapper, 10kW at 26kHz. Powered by a ZVS (Mazzilli) oscillator running from rectified 240VAC line voltage (dryer outlet). Normal weeds in first section of video actually need much less zapping than I did here. Even weeds hit for a second or so have since died. From what I understand, key is heating weed root to ~50C or higher with electrical current. Arc flame on top isn't important, just a consequence of HV power. I have no idea if moss zapping was at all effective. It's mostly dormant in this dry weather. Will find out next winter. BTW, here's links to a couple commercial farming weed-zapping units. Most commercial units are higher power than mine, but some are as small as 5kW so less than my home-made one. • Weed Zapper Research at Cornell University • Up Close And Personal With The Terminator ...