Hi,
Great price on those panels mena--thanks for finding them.
The advantage of the micro inverters is that when one fails you are not "dead in the water". I'm at a loss as to how you know that one has failed.
Repairs on the roof would not be fun where I live in winter time. Heat in the summer time would "derate" the output on the micro inverters.
With 20 panels strings of series/parallel would be good--and grid tied inverters often accept 600 vdc input.
Have you considered a small battery bank to make it a hybrid system so that when the grid falls over you would still have power?
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.