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$100 + labour for assembly + testing to make sure the panel works + the cost of an extra DCDC converter + wiring to the roof + supply chain risk with all the above parts. Toyota tried it for a while, but I don't think any new Prius models have a solar roof.

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Which are all quite minimal costs compared to many other features with very little or negative utility.

Like anything with cars it's purely a matter of fashion, ego, and perception. Noone who isn't making a purely emotional decision buys a new car. Adding a thousand or two and 5kg is completely irrelevant. If people don't percieve an extra 10-20 miles a day as worth the ugly blue rectangles, then the one with them could be 200kg lighter and $5000 cheaper and it still wouldn't sell.

Cars are made by robots. Marginal labor cost is not a thing for car manufacturing.

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