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 said the cost of its new system amounts to the cost of an ordinary roof plus the cost of electricity. If one were to re-roof a typical 2,000-square-foot roof, the cost would be about $12,000 to $15,000 (including quality shingles, underlayment, other materials, removal and sheathing repair).