A great accessory would be a solar panel which can be mounted on the roof and/or hood of the car to recharge the battery while the car is parked in the sun all day. This would be great for commuters in California and other states where the sun shines bright most days. A 500 watt solar panel would provide 4 kW hrs during an 8-hour shift. That could extend the electric range of the Volt by 20 miles. Plus, solar energy is free and generates zero emissions.