How reliable are these solar panels

The Schuko grade B panels look good if you have the space. A single 235 watt panel with an MPPT controller which can handle the input voltage and output 12 volts would be enough for most boats
 
The Kyocera panels (KB I guess) had a 20 year warranty and are amongst the best-regarded in the industry. However they're inefficient compared to new panels (10% cf 18% conversion).
Having flirted with cheap PV panels I'd be disinclined to buy any of those listed - current prices for new panels direct from the importers being little different in price, much smaller for a similar output and likely to be producing >80% for the full 20 years.
 
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