one quite issue with the video and that is Tesla car batteries have a slightly different chemistry compared to their grid batteries which will be plugged to the solar panels. This is because the energy products are designed to be charged and depleted everyday. the Tesla battery is more for every day commuting and the occasional long distance travel. one of Tesla's heads said in an interview that the car batteries won't be used to power the grid.,(reply>), @***** My point was that having different battery chemistries won't matter except that the car batteries probably cost more which would be economically stupid (if they get cheap enough and it doesn't cost a fortune to replace them it wouldn't be that bad).<br><br>For your argument about being designed to be charged every day it doesn't really matter as long as they are kept within design specifications (even if that means only using 5% of the car's battery capacity) Cost is still a factor that needs to be addressed.,(reply>), +2Awesome it does in the long term,(reply>), battery chemistry doesn't matter at the grid level if the onboard controllers are doing their job