This website will help with your PV cable sizing:
"I've witnessed many fantastic changes and innovations arrive on the scene. I've seen installation companies come and go. My fellowship with ethically-minded MCS solar panel installers goes back decades. Today, I offer my experience to help you install the best."
Power My Home Solar Panels UK
Sundial House, 44 Panton Road, Chester CH2 3HX.
01244 722 607