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.
When we add that to our initial $26,030 gross cost of a solar panel installation from Scenario 1, a new asphalt shingle roof and solar panels costs $34,080 altogether. Teslaâs solar roof costs an extra $16,870 for our California homeowner, equivalent to a 33 percent price premium for Teslaâs attractive glass tiles. Lastly, just like in the first scenario, itâs worth mentioning that Teslaâs solar roof will only produce about three quarters the level of solar electricity as compared to traditional solar panels â meaning their electricity bill wonât go down as much as it could. Scenario 3: You love new technology, want solar, and have money to spend