Here is the 6th inverter that failed… on a 6 inverters installation!
It has melted, like the number 5. You can find more details about the repair of the number 5 on this blog.
In the center of the picture, we can see that the precision transformer (in blue) has melted! And it’s not even close to the Mosfets! The specs says that it’s rated at 80°C but can sustain up to 130°C. This means that the wvc-600 inverter, with it’s sealed enclosure and no cooling, runs above 130+C!!!
We can also see that the smps transformer (yellow on the right) is starting to peal off!
Another funny thing: the third smd cap (from the bottom) is smaller than the two others. It should be a 100 uF capacitor, but I guess Kaideng was missing one. So how do you know: they just put a 22uF cap! Who cares, right?
Here is another view of the wvc 600 inverter, showing the dead bulged smelly linking input caps. The rest of it is stuck on the case cover.
But hey, I’m starting to get used to this. After changing the dead capacitors, the input cables, the melted MC4 connectors and the meted transformer, it runs again… What will happen next?
As most of Chinese inverters, and after 6 inverters blown up, I can say with certainty that the specs of the WVC micro inverters are a lie. They cannot sustain 600 Watts. Well, for starter, the efficiency is so bad that with 600W of solar panel, they have never put up more than 500W. But still, I strongly advise not to feed more than 300W, unless you modify them with a proper cooling.