300×210 Hours of the Day, in Tesla Powerwall, by John S. Quarterman, 1 May 2015 ← Previous Next → 300×210 Hours of the Day, in Tesla Powerwall, by John S. Quarterman, 1 May 2015, http://www.teslamotors.com/powerwall 300×210 Hours of the Day, in Tesla Powerwall, by John S. Quarterman, 1 May 2015, http://www.teslamotors.com/powerwall