150V 45A MPPT - roll your own


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rogerdw
Guru

Joined: 22/10/2019
Location: Australia
Posts: 877
Posted: 12:21pm 18 Mar 2024      

  -dex- said  What model of MOSFETs and diodes you are using?


Hi Dex, I am using FDH055N15A 150V 156A TO-247-3 Mosfets

Element14 PtNo 2825158

STPS61150CW 150V 60A TO-247 Schottky Diodes

Element14 PtNo 2806773


Both horribly expensive  ...  but I figured if I used the best spec I could, hopefully they'll be more reliable and forgiving.

And so far I haven't had any fail.

I fitted another dozen 250 watt panels on the weekend and hooked up the third mppt. Only thing that's a little disappointing is that the output is quite a lot lower than the other two that each have a dozen 275 Watt panels.

While the first two might be pumping out 2,800 watts each, the third one might only be supplying 1,800 watts. Now I'm weighing up if I fit the other 12 x 250 watt panels I have here  ...  or sell them and buy some more 275 or 300 watt panels instead.