John Drake Services, Inc.
1427 E. 68th Street
Long Beach, CA 90805
electricity from the sun by John Drake II | home
About Us | About this website. | Getting Started | Solar Panels / Photovoltaic Modules - Read Before You Buy | Make A Plan | PV System Layout and Parts | Start with the loads you are going to operate | Battery Types and Sizing | Battery Safety | Battery Charging Voltages and Temperature | Battery Trouble Shooting | Charging Batteries - You can't have everything. | Battery State of Charge and Measurement | Safety Devices Fuses and Circuit Breakers | Series & Parallel Wiring | Wiring and Power Distribution Connections | Photovolatic Module Specifications - Real or a Pipe Dream | Photovoltaic module solar panel location and positioning | Photovoltaic Module and Solar Panel Information | Charge Controller Types | Wire and Cable Types | Wiring - Doing it Right | Connections for Wiring | Voltage Drop - Wire Loss, What are they? | Outdoor Connections | Wire loss - Voltage drop charts | D.C. to A.C. Inverters | Low Voltage D.C. Lighting & Color Temperature of Light | Battery System Monitoring | Dont fool yourself - Spending your money wisely. | Solar Converters GS-1AC | Linear Current Boosters for Water Pumping | Utility Grid Intertie Systems | Solar Insolation Chart | More Information | Alternative Energy Expectations | Power Needs Worksheet | Reference Sources | Contact Us
Solar Insolation Chart
The following is courtesy of US Schott.
This chart shows solar insolation in kilowatt-hours per day in many US locations.
For simplicity, we call this figure "Sun Hours / Day".
To find average sun hours per day in your area (column 5) you can look at the maps
above or find the city you are located in or near to on the following chart.
If you want year-round autonomy (where you will have enough power for periods of
reduced sunlight due to inclement weather), use the lowest figure. If you want 100%
autonomy in the summer, use the highest figure.