The best-known of these tools is probably the hand-held window squeegee, used to remove the cleaning fluid or water from a glass surface. A soapy solution acts as a lubricant and breaks up the dirt, then the squeegee is used to draw the now water-borne dirt off the glass leaving a perfectly clean surface.
Another way of estimating the cost of electricity would be the cost of an ordinary solar system, or $21,000 as shown in the example above. So the cost of a Tesla retrofit system would be in the range of $33,000 to $37,500.
Tesla will offer Powerpack, sold in 100-kilowatt-hour modules at $25,000 each. According to CNET, Tesla has already started working with industrial customers on these installations. 4. Low price point: The price for the residential battery is much lower than most experts anticipated â upwards of $10,000.