Does anyone know how the electrical connection works? It seems to me that this is critical. If connections fail in a really hostile environment (high thermal r

Does anyone know how the electrical connection works? It seems to me that this is critical. If connections fail in a really hostile environment (high thermal range and moisture levels) then maintenance will kill any savings. But if they've solved this problem, (and perhaps have an efficient way to replace tiles without removing the ones above), then I'd guess they will be wildly successful. I once visited my brother who was having a new slate roof installed. While inspecting it, he saw a cracked slate on the bottom row. He insisted it be replaced, which meant removing an ever-increasing triangle of tiles above it, until you reached the ridge. The contractor did not have a good day.