100 Watt Solar Panels

The chart below gives an example of what a 100-watt panel will run in a typical week. The panel will generate approximately 3,500 watts hours of energy per week (100 watts x 7 days x 5 hours). To estimate how much energy you need, add up everything you want to run off it. Multiply the nominal power rating of each device (ex: 60-watt light bulb) by the amount of time you expect to use it in a day (ex: three hours). Add up all these and divide by 5 (the number of hours per day you have to recharge your batteries using solar panels). This should give you a good idea as to the size of the solar system you need to keep your batteries from draining.

100-Watt
Solar Panel

Typical
Output/Week*= 3,500 Watt Hours