public class Add { private static String rightJustify( String s , int newLength ) { while( s.length() < newLength ) { s =   + s ; } return s ; } private static void justifyAndPrint( String leadingText , int number , int totalLength ) { // convert the number to text String s =  + number ; System.out.println( leadingText + rightJustify( s , ...
Why Solar Energy? A typical residential solar PV panel system in the U.S. costs $3.60/watt after installation, and the solar panels typically save the customer over $20,000 (net) over the course of 20 years. Learn more about the many advantages of solar energy.
The cost of solar. Letâs go with some simple assumptions for the cost of panels, inverter, batteries, and more. The nationwide average for the cost of solar equipment is $4/watt. Youâll also need two Tesla Powerwall 7-kWh batteries for charging the car, which cost $3,000 each plus $1,000 for installation.