This is caused by the squeegee being angled incorrectly forcing the water under the rubber blade out into the dry area of the glass or from solution being pushed up into the top edge of the window.
Although there is a slight difference between our original calculation and Teslaâs new oneâlast fall we built in a cost of $6,500, Teslaâs current cost for a Powerwall as part of a Solar Roof installation is $7,000.
Teslaâs calculator quoted a total upfront cost of $45,400 for the roof and Powerwall, and estimated that over 30 years, the system would save $46,800 in energy costs. The calculator also found that the system would qualify for $12,500 in federal Investment Tax Credits.