OK, so the EMAV PRU (Electric Motors and Vehicle Company Power Regeneration Unit) isn’t expected to go on sale until sometime next year, but it’s one curious approach to the “range anxiety” problem that caused GM to develop the Volt as a range-extended EV rather than a pure battery-only EV. The PRU takes a simple concept, a trailer that can both store goods and generate 25kWh of electricity from a 750cc diesel engine in order to extend range, and makes it considerably more complicated than it needs to be. For one thing, it’s self-propelled, necessitating on-board lithium-ion batteries, as well as an electric drive unit.
As a result, the projected pricetag comes to a prohibitive $15,000, and the weight reaches an EV range-sapping 1,220 lbs. And for all that, wouldn’t a $15k hatchback make a better “range extender” than this cumbersome trailer? On the other hand, a trailer like this just might work as a rental item, offering a portable generator as well as range extension that its makers say will work with any electric car. But would something like this be more appealing as a simplified, lighter unit (non-self-propelled), or will add-on range extension always struggle to offer more for money than having a gas car as a compliment to an electric car? Given that American families typically have several cars anyway, the answer would appear to be yes… [via GM-volt.com]