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.
Tesla estimated the homeowner would need 2,779 square feet of roofing, and suggested half solar and half non-solar tiles. The cost of the roof came in at $73,600, and the calculator recommended two Powerwalls, for an additional $12,500.