Installed another 2 ImmerSUN's today

, neither of them our installs, on BOTH the array 10mm earth had been linked into the existing PME system. One had no DC isolators on a SMA SB4000TL, the other used 2.5mm figure of 8 chinese T&E, neither had structurals calcs done, neither had recieved a Building Regs certificate, both were connected through dedicated CU's with RCD's (good - except--) - one had a spare way in it, the other (SB4000TL) was connected though a double pole 25A 30ma RCD (not RCBO), no MCB, one so close to the edges and ridge a good northerly wind would put great strain on the roof.