Hello guys,
I had about the same problem with my WVC600 micro inverter some days after putting it under the sun, but when I opened it to look for the 4 culprits I found 8 of them. 4 FETs for each panel. All shorted. They where so cooked I could not even read what one day they were.
I got a message telling me this topic is rather inactive, but since my inverter was bought about the same time ago, it was kind of a surprise to find those small FETs instead of the TO-220 package. They are about half the size of TO-220 or D2PAK, even smaller than a DPAK too. I don't know that package, but have found some of them in electric model airplane speed controllers too. They look like SOIC-8 IC.
Do any of you know them? I'd like to use a standard TO-220 package FET instead, since those smaller guys may be difficult to find here, but I should at least know the pinout and original specs to check how to select the substitute. Of course, they are used in parallel pairs and I'll have to consider it to replace them.
Please find attached picture.
Thanks in advance for any help.