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.
Elon Musk with one of the solar-roof shingles.Tesla. Tesla CEO Elon Musk says the solar roof that will be sold under a combined Tesla-SolarCity will most likely cost less to install than a normal roof. Tesla and SolarCity shareholders voted in favor of the merger, a deal worth $2 billion, on Thursday.