So I was saw a Prius yesterday with a solar panel in the roof. I was curious how much it helped and went to find out about it and read this.
The Underwhelming Solar Prius
Toyota, it turns out, won’t even bother plugging its solar rooftop panel into the 2010 Prius’s nickel-metal-hydride battery.
EVWorld editor Bill Moore, citing a conversation with Akihiko Otsuka, chief engineer for the Prius redesign, writes that
Toyota tried it and apparently discovered that for not-entirely-well-understood reasons, connecting the PV panels to the battery turns them into an “antenna” of sorts, which at the very least seems to disrupt the car’s radio.