Only a couple weeks after Tesla unveiled the Powerwall I read a long article about the Powerwall of all things having some problem accepting the charge from PV. The article did not focus much on the actual problem but on the business and financial issues it was going to cause for both Tesla and the many whom have already ordered the Powerwall. The article came from a reliable source and I believe it to be true. On a happier note Im up to 1400 watts of panels and Im adding another 200 watts next week. My elec. bill in down to 20$ a month. Im paying close to 1$ a watt for panels and they will pay themselves off in less than 2 years. I also recently read that a new company is starting to produce clear solar panels just wires attatched to the glass that produce 50 times as much power as reg. panels not only can they be used as windows they can install them on your existing windows= payback in 1-2 years. I love solar LOL.