Lab Update #78: Repairing Solar Micro Inverters

On the table I've got an Enecsys 450W and a WVC-700 (or 600?) micro inverter. Can I fix them?
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[@alejandroluer]

Thank you! Very helpful, sometimes it isnt worth the effort to repait this junky inverters. One expect them to last 10 years but last yust a couple of kwh. Keep teaching us!

[@ev-olution8597]

Buy quality brand old failed inverters. They are very easy to fix. In most cases just needs a new relays, or diodes or even just resoldering some bad connections. I tried to source faulty one for parts for Loadmaster XP project. Ended up buying 4 inverters rated between 2 and 4kW (each just 20-40 Euros). Almost all had just a minor faults. One of them had no fault at all, I guess it was users fault :) Anyways, I had to sacrify one for parts, as I couldn't keep trying to source one with a major problem.

[@mikaelstrindfors7545]

What did you replace the failed diode across the MOSFET with? I working with one inverter now and two diodes has failed, but have no markings on these SMD diodes.

[@Nicolas-qb3yg]

I have one of wvc300 that blow the AC part. The DC seems to work (led is ON) . Is it worth checking to repair (the moffset I guess from your analysis). My solar panel is around 250w max so not a full load so do you think it is still worth ?

[@zaneenaz4962]

Recycle the parts..... curious how you arranged the three V-limiting diodes (also are they across the source and drain?)

[@EngineersFear]

Check the video by VoltAmpereLux, he went more in depth on this

[@crasbee]

Sometimes I wonder if a Chinese engineering department is like "yeah, it works for a couple of weeks/months, let's sell it!" ☹☹

[@alejandroluer]

Lol😂

[@bildmateria]

"all optimisations just led to more failures" 😂

[@EngineersFear]

sounds familiar? 😀