Solar electric hot water conversion

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Solar Mike

Joined: 08/02/2015
Location: New Zealand
Posts: 746
Posted: 06:35am 15 May 2020      

  rosspeel said  Long story short, I fried them, the temp got to 110 deg C +, back to the drawing board, I am running at about 65 volts with a current of 17 amps, just wondering if I have a gang of 4 or of these mosfet I would distribute the load a lot better and with a resistance of 0.082 Ohms between the source and the drain that resistance would maybe the source of the heating up
0.082 ohms using 1 mosfet
0.022 ohms using 4 mosfets
0.013 ohms using 6 mosfets

Suggest get a better mosfet, plenty around with Rdson values less than 0.003R, see this one IRFP4468
less than 1 watt dissipation at your 17 amps, hardly requires a heat sink.