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100% failure is not an outlier in my experience. It may not be mechanical failure, but comms instead. I have seen very close to if not 100% of systems installed have some sort of issue, or multiple failure issues. No one really has the communications side of these things down yet. Communication, or inverter malfunction errors are typical on any micro installation I have seen. The costs of micro inverter versus central inverter replacement and micro service calls are much more expensive. I cannot imagine deploying micros on a commercial scale until a few things happen. The price per unit would have to fall dramatically in order to make up for the increased labor costs, and the communication issues would need to be orders of magnitude better.We have installed a 140kw micro inverter system and it was at the customer request. The saving grace of the installation is that it is a carport structure and the micros are accessible via an 8' extension ladder. No modules have to be pulled in order to service a micro. I do not recommend micro inverters to anyone looking for more than a kw or so. That is also changing with newer small HF style central inverters with low MPPT ranges. That being said, the customer base Loves micro inverters. Many customers are sold on them before speaking to a sales rep, so someone on the micro side is doing something right! The shading argument is a little off in my opinion and there is a fine line between selling someone a system that has incremental shading, and selling someone a shady system..... System design with a micro can be more simple for a non technical sales person, but it can also lead to poor array placement if left unchecked by the technical support and engineering staff. There is a lot of, oh look a big roof with shade on it, lets use micros inverters happening out there right now. I am in agreement that they have a place in the pv world, but due diligence and robust system design should remain prime drivers on site selection.