Power isn't always indicative of cooling needs. It's one thing to cruise up a mountain pass in a Ferrari. It's another to do so in a Ford F-350 with a 15,000lb loaded trailer.
Shutters just mean you can be more aerodynamic if where you live is cool enough. There are places in this world that are too hot to properly cool an EV battery. There are other places where you can block off the radiator on just about any vehicle and never have to worry about it.
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