Solar electric hot water conversion

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Joined: 05/06/2004
Location: Australia
Posts: 4860
Posted: 04:24am 15 May 2020      

Yeah that makes sense. I was going to suggest a bigger heat sink, but you're right, more in parallel means less resistance, so less watts in the heat sink.

Try 4 and keep an eye on the temp. I go by the rule if I can hold my finger on it for a few seconds, its ok.

The mosfet heat issue is why I tried to use a relay, but that was more prone to problems with contact's getting vaporised, so I went back to the big mosfet on a bigger heat sink and fan.

Tesla was right, AC power is a lot easier to use than DC.