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.
By contrast, Tesla is on a comparable glide path, has said it hopes for the $100 per cell by a 2020-ish timeframe as its Nevada Giga factory comes fully online, enabling it to sell its Model 3 for as low as $35,000.