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.
Overall costs for home solar systems have stayed shockingly stable since 2015, with our data indicating that the average price in 2015 was $18,675, and in 2016 it was $18,497. However, while system prices have stayed stable, declines in price per watt have led to homeowners being able to buy progressively larger systems for the same price.