Our home has a 200 AMP main service disconnect and a 200 AMP sub-panel inside the house. The barn is about 200 feet away with a small sub-panel and is currently fed by a an overhead 8/3 wire. I plan to install solar panels on the barn roof (5-kw array) and connect the inverter to to the barn's sub-panel.
Do I need to increase the size of the wire feeding the barn? It will be carrying all the electricity produced by the solar panels. How do I know what size wire is appropriate? Also, I plan to put any replacement wire underground in conduit.
Thanks for your help.