Worthing is as far east as we go, and well worth the run. Goring-by-Sea, Ferring and Findon Valley are bungalow country, with big hipped roofs and households at home in the day, which usually means a modest system rather than the biggest one that fits. Broadwater, Tarring and Durrington are 1930s semis with simple roofs, and the seafront and town centre are Victorian terraces and flats, where the flat-owner EV charger grant of £500 a socket often applies.
Worthing is consistently among the sunniest towns in the UK in Met Office averages, so the south-coast figures in our calculator are, if anything, cautious here. Salt air on the front means marine-grade fixings.