Here is the step up16 x 247 w mountef on metal roof Sb 4000 tl On a submain with rcd protecting inverter , lights and powet Few weeks ago rcd triped . Clieny turned off inverter call meI got there and reset the inverter Every ok waited around nothingI noticed a light switch flashing when turned on So i had a look loose cable sorted it.Anyway i have had same call again TodayClient seems to think whem it rains it trips ??? Any advice would be goooood