None on my roof. Much to my amazement. They arrived late, and did half the installation in the dark. I inspected the job with trepidation the next morning, and it was perfect. Best tradie job ever. 1.5kW for $1,700. Been generating ever since, no power or cut out problems. If it is causing cut-out problems to the misery guts next door (esp. his noisy airconditioners), then that's an added bonus!
