200m^2 of 100% efficient solar cells will net you around 50hp. However, most solar cells are only about the order of 15% efficient at the conversion or thereabouts. However, even saying that, a 50hp rated car engine does not necessarily sink 50hp worth of actual power when driving - the hp rating may well be a theoretical peak engine output. You'd really need to go way more indepth to figure out the minimum solar cell area for motorway driving (including fluid and surface drags).
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200m^2 of 100% efficient solar cells will net you around 50hp. However, most solar cells are only about the order of 15% efficient at the conversion or thereabouts. However, even saying that, a 50hp rated car engine does not necessarily sink 50hp worth of actual power when driving - the hp rating may well be a theoretical peak engine output. You'd really need to go way more indepth to figure out the minimum solar cell area for motorway driving (including fluid and surface drags).