Solar Mike Guru Joined: 08/02/2015 Location: New ZealandPosts: 1162
Posted: 06:35am 15 May 2020
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.