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Each system is unique and its configuration depends of goals - in case when owner is connected to reliable grid and intended just to save some money and maybe sell some electricity, and has not more than 10 panels, then M215 is a good choice. But if he has not reliable grid, he must have an energy (batteries, for example) storage, a completely different (and much cheaper) of MPPT battery chargers, I would recommend 150 or 300 V strings, and a few cheap synchronized transformerless converters.
And of course he must have some spare converters, batteries and chargers.
And if the goal is just an energy producing, we just throw out batteries and replace cheap chargers with cheap optimizers.
Here will be always lots of questions - for example, (by the way, how exactly) plug strings in parallel or use discrete converter for the each string, how to clean panels in reality, will broken converters just stop energy producing or turn into short circuit, which wires, connectors and insulators will survive climate, where to position converters and other stuff to safe it of lightning, mices, children, how to avoid unnecessary spends, etc. etc. - it is a kind of art.