I’m so sorry if this has been asked before. We have a large shed with a south facing roof around 100m from the house and would like to install 8-10 solar panels on it to provide electricity for the house and export any surplus to the grid. Digging a new cable run between the house and the shed would be a nightmare so we wondered if we could put an inverter in the shed and then use the existing mains cable which runs from the house to transfer the AC power produced by the solar set up to the house. It is a 3 core, 25mm armoured cable, each core has 6 strands of copper wire. It’s around 100m long and the shed has its own consumer unit. We’d want to be able to continue to use the cable to supply power to the shed. Sorry if this sounds a bit vague, we just want to know if the project is viable before contacting an electrician.