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.
Last fall, when Tesla CEO Elon Musk first unveiled these photovoltaic, tempered-glass roofing tiles, Consumer Reports performed a cost analysis and determined that, for a Solar Roof to compete with a conventional asphalt roof, it should not cost more than $24.50 per square foot for an average-sized American home.