They're likely using 301, which won't stand up to free chloride ions well. 304 or 316L would be better, n50 or n60 would be best, but you've just doubled the c

They're likely using 301, which won't stand up to free chloride ions well. 304 or 316L would be better, n50 or n60 would be best, but you've just doubled the cost of the panels...