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1 Site Search - Quick Index | 2 The Realities of Purchasing On-Line | 3 Why Do Business With Us? | 4 Distributor of IOTA Engineering, Quick Cable and Anderson SB products | 5 Photovoltaics,Batteries, Cable and Wire | 6 Lumen Outputs of Compact Flurescent and Incandescent Lights | 7 Delta Lightning Arrestors | 8 DC Lights | 9 DC Fluorescent Lights | 10 DC Fluorescent Outdoor Floodlights | 11 DC Screw-in Compact Fluorescent Ballasts & Tubes | 12 DC Screw-in One Piece Compact Fluorescent Lights | 13 DC Indoor Flood, Ceiling and Cabinet Fluorescent Lights | 14 Portable & Emergency Fluorescent Light by Flexcharge | 15 DC Fluorescent Ballasts by LIT and IOTA | 16 Charge Controller Musings | 17 DC LED Lights | 18 Light Bulb Socket Adapters | 19 Thinlite Indoor Lights | 19 A - Thin-Lite Heavy Duty Truck Dome Lights - Fluorescent | 20 Thinlite Outdoor Lights | 21 Thinlite Replacement Ballasts | 22 Thinlite Replacement Lens - Diffusers | 23 Thinlite DC Lighting Products | 24 DC Lighting | Glossary of Alternative Energy Terms | 25 Parallel Battery Bank Information | 26 What we sell and why. | 27 Amps Volts and Watts | CHARGE CONTROLLERS | 28 Morningstar Charge Controllers & Others | 29 Photovoltaic Module & System Wiring Layout | 30 Wind - Hydro - Solar Charge Controllers by Flexcharge | 31 Water and Air Heating Diversion Loads for Charge Controllers | 32 Maximum Power Point Tracking Charge Controllers | 33 Solar Converters, Inc. Charge & Lighting Controllers | 34 SES Flexcharge Charge Controllers | 35 Flexcharge Charge & Lighting - Load Controllers | 36 Solar Converters Special Solar and Battery Charging Equipment | 37 TriMetric , Flexcharge and Solar Converters Battery System Monitors | 38 Timers,Linear Current Boosters,Photoswitch,Relay,Switches | 39 Battery Desulphator | 40 Solar Converters, Inc. Products | 41 Flexcharge Products | 42 DC Circuit Breakers | 43 DC Circuit Breakers to 80 volts | 44 DC Fuse & Circuit Breaker Types & Installation | 45 UL Listed DC Breakers up to 125 volts | 46 Cathodic Protection Controllers by Solar Converters | 47 Our own alternative energy systems | 48 DC Fuses, Holders & Fuse Blocks | 49 Class T- DC Fuses & Fuse Blocks | 50 ANN - ANL - CNL DC Fuses & Fuse Blocks | 51 Inverter Cable and Overcurrent Protection Guide | 52 Adapter Bushings for Lugs and Battery Connectors | 53 Copper Buss Bars by Deltec Co. | 54 Low Voltage D.C. Lighting Tips | 55 Your On-Line Privacy | 56 Connectors & Strain Relief Fittings | 57 Power Distribution & Splicer Blocks | 58 Cable and Butt Splices & Connectors | BATTERY POST & TERMINAL CONNECTIONS, ADAPTERS AND BATTERY ACCESSORIES | 59 Battery Post Marine Conversions & Terminal Extensions | 60 Battery Post Connectors Conversions Adapters Repair | 61 Battery Terminal - Cable Lug Covers & Protectors | 62 QuickCable Cable Lugs & Heat Shrink Tubing | 63 Compression Connectors - Lugs | 64 Heavy Duty Cast Copper Connectors - Lugs | 65 Copper Connectors - Lugs by Quick Cable - MAXX | 66 Magna Lug Heavy Duty & Fusion Lugs by QuickCable | 67 Anderson SB Connector quick connects | 68 Anderson SB Accessories | 69 Anderson SB Parts | 70 Anderson SB Connector IndustraCrimp tool by QuickCable | 71 Overview of Our Photovoltaic Systems | 72 Iota Battery Chargers / Converters and others | 73 Adapters, Plugs, Sockets, Cords, SAE connectors & Extensions | 74 Electric Vehicle Power Supplies Converters by IOTA Engineering | 75 DC to DC Voltage Converters & Dimmers by Solar Converters | 76 Transfer & Generator Start Switches, Distribution Panels | 77 Stranded vs Solid Wire in low voltage systems | 78 IOTA Engineering power products | 79 QuickCable Tools, Cable Crimper, Cutter & Stripper | 80 Battery Boxes | 81 Power Vent Battery Box Fans by Zephyr Industries | 82 DC to DC Voltage Converters | 83 IOTA Transfer Switch & TriMetric 2020 Features | 84 IOTA Engineering DLS Battery Charger Features | 85 Lighting Systems | 86 Practical Alternative Energy Applications | 87 Portable and Emergency Power Systems | 88 Custom Cables | 89 Our Customers Systems | 90 Specials | 91 IOTA Transfer Switch Views and Schematics | 93 | 94 Battery Wiring Diagrams | 95 Battery Condition and State of Charge Charts | 96 Order Form | 97 Backup Power? | 98 Energy Expectations | 99 Power Needs Worksheet | 100 Efficiency | 101 Wire Loss Chart | 102 Solar Insolation Map / Chart | 103 Utility Inter-tie | 104 About Us | 105 Statement of Policy & Warranty/Returns | Contact Us | MPPT Charge Controllers - FAQ | Battery Equalizer/DC Autotransformers - FAQ | Constant Voltage Pump Drivers - FAQ | Linear Current Boosters - FAQ | Information | 1 | 2 | 3 | 4 | 5 | 6 | 7 | NEWS-info links | Home Power Articles | R | P | A | B | C | D
102 Solar Insolation Map / 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.
State
|
City
|
High
|
Low
|
Avg.
|
|
State
|
City
|
High
|
Low
|
Avg.
|
AK
|
Fairbanks
|
5.87
|
2.12
|
3.99
|
|
MO
|
Columbia
|
5.5
|
3.97
|
4.73
|
AK
|
Matanuska
|
5.24
|
1.74
|
3.55
|
|
MO
|
St. Louis
|
4.87
|
3.24
|
4.38
|
Al
|
Montgomery
|
4.69
|
3.37
|
4.23
|
|
MS
|
Meridian
|
4.86
|
3.64
|
4.43
|
AR
|
Bethel
|
6.29
|
2.37
|
3.81
|
|
MT
|
Glasgow
|
5.97
|
4.09
|
5.15
|
AR
|
Little Rock
|
5.29
|
3.88
|
4.69
|
|
MT
|
Great Falls
|
5.70
|
3.66
|
4.93
|
AZ
|
Tucson
|
7.42
|
6.01
|
6.57
|
|
MT
|
Summit
|
5.17
|
2.36
|
3.99
|
AZ
|
Page
|
7.30
|
5.65
|
6.36
|
|
NM
|
Albuquerque
|
7.16
|
6.21
|
6.77
|
AZ
|
Phoenix
|
7.13
|
5.78
|
6.58
|
|
NB
|
Lincoln
|
5.40
|
4.38
|
4.79
|
CA
|
Santa Maria
|
6.52
|
5.42
|
5.94
|
|
NB
|
N. Omaha
|
5.28
|
4.26
|
4.90
|
CA
|
Riverside
|
6.35
|
5.35
|
5.87
|
|
NC
|
Cape Hatteras
|
5.81
|
4.69
|
5.31
|
CA
|
Davis
|
6.09
|
3.31
|
5.10
|
|
NC
|
Greensboro
|
5.05
|
4.00
|
4.71
|
CA
|
Fresno
|
6.19
|
3.42
|
5.38
|
|
ND
|
Bismark
|
5.48
|
3.97
|
5.01
|
CA
|
Los Angeles
|
6.14
|
5.03
|
5.62
|
|
NJ
|
Sea Brook
|
4.76
|
3.20
|
4.21
|
CA
|
Soda Springs
|
6.47
|
4.40
|
5.60
|
|
NV
|
Las Vegas
|
7.13
|
5.84
|
6.41
|
CA
|
La Jolla
|
5.24
|
4.29
|
4.77
|
|
NV
|
Ely
|
6.48
|
5.49
|
5.98
|
CA
|
Inyokern
|
8.7
|
6.87
|
7.66
|
|
NY
|
Binghampton
|
3.93
|
1.62
|
3.16
|
CO
|
Grandby
|
7.47
|
5.15
|
5.69
|
|
NY
|
Ithaca
|
4.57
|
2.29
|
3.79
|
CO
|
Grand Lake
|
5.86
|
3.56
|
5.08
|
|
NY
|
Schenetady
|
3.92
|
2.53
|
3.55
|
CO
|
Grand Junct.
|
6.34
|
5.23
|
5.85
|
|
NY
|
Rochester
|
4.22
|
1.58
|
3.31
|
CO
|
Boulder
|
5.72
|
4.44
|
4.87
|
|
NY
|
NY City
|
4.97
|
3.03
|
4.08
|
DC
|
Washington
|
4.69
|
3.37
|
4.23
|
|
OH
|
Columbus
|
5.26
|
2.66
|
4.15
|
FL
|
Apalachicola
|
5.98
|
4.92
|
5.49
|
|
OH
|
Cleveland
|
4.79
|
2.69
|
3.94
|
FL
|
Belie Is.
|
5.31
|
4.58
|
4.99
|
|
OK
|
Stillwater
|
5.52
|
4.22
|
4.99
|
FL
|
Miami
|
6.26
|
5.05
|
5.62
|
|
OK
|
Oklahoma City
|
6.26
|
4.98
|
5.59
|
FL
|
Gainesville
|
5.81
|
4.71
|
5.27
|
|
OR
|
Astoria
|
4.76
|
1.99
|
3.72
|
FL
|
Tampa
|
6.16
|
5.26
|
5.67
|
|
OR
|
Corvallis
|
5.71
|
1.90
|
4.03
|
GA
|
Atlanta
|
5.16
|
4.09
|
4.74
|
|
OR
|
Medford
|
5.84
|
2.02
|
4.51
|
GA
|
Griffin
|
5.41
|
4.26
|
4.99
|
|
PA
|
Pittsburg
|
4.19
|
1.45
|
3.28
|
HI
|
Honolulu
|
6.71
|
5.59
|
6.02
|
|
PA
|
State College
|
4.44
|
2.79
|
3.91
|
IA
|
Ames
|
4.80
|
3.73
|
4.40
|
|
RI
|
Newport
|
4.69
|
3.58
|
4.23
|
ID
|
Boise
|
5.83
|
3.33
|
4.92
|
|
SC
|
Charleston
|
5.72
|
4.23
|
5.06
|
ID
|
Twin Falls
|
5.42
|
3.42
|
4.70
|
|
SD
|
Rapid City
|
5.91
|
4.56
|
5.23
|
IL
|
Chicago
|
4.08
|
1.47
|
3.14
|
|
TN
|
Nashville
|
5.20
|
3.14
|
4.45
|
IN
|
Indianapolis
|
5.02
|
2.55
|
4.21
|
|
TN
|
Oak Ridge
|
5.06
|
3.22
|
4.37
|
KN
|
Manhattan
|
5.08
|
3.62
|
4.57
|
|
TX
|
San Antonio
|
5.88
|
4.65
|
5.30
|
KN
|
Dodge City
|
4.14
|
5.28
|
5.79
|
|
TX
|
Brownsville
|
5.49
|
4.42
|
4.92
|
KY
|
Lexington
|
5.97
|
3.60
|
4.94
|
|
TX
|
El Paso
|
7.42
|
5.87
|
6.72
|
LA
|
Lake Charles
|
5.73
|
4.29
|
4.93
|
|
TX
|
Midland
|
6.33
|
5.23
|
5.83
|
LA
|
New Orleans
|
5.71
|
3.63
|
4.92
|
|
TX
|
Fort Worth
|
6.00
|
4.80
|
5.43
|
LA
|
Shreveport
|
4.99
|
3.87
|
4.63
|
|
UT
|
Salt Lake City
|
6.09
|
3.78
|
5.26
|
MA
|
E. Wareham
|
4.48
|
3.06
|
3.99
|
|
UT
|
Flaming Gorge
|
6.63
|
5.48
|
5.83
|
MA
|
Boston
|
4.27
|
2.99
|
3.84
|
|
VA
|
Richmond
|
4.50
|
3.37
|
4.13
|
MA
|
Blue Hill
|
4.38
|
3.33
|
4.05
|
|
WA
|
Seattle
|
4.83
|
1.60
|
3.57
|
MA
|
Natick
|
4.62
|
3.09
|
4.10
|
|
WA
|
Richland
|
6.13
|
2.01
|
4.44
|
MA
|
Lynn
|
4.60
|
2.33
|
3.79
|
|
WA
|
Pullman
|
6.07
|
2.90
|
4.73
|
MD
|
Silver Hill
|
4.71
|
3.84
|
4.47
|
|
WA
|
Spokane
|
5.53
|
1.16
|
4.48
|
ME
|
Caribou
|
5.62
|
2.57
|
4.19
|
|
WA
|
Prosser
|
6.21
|
3.06
|
5.03
|
ME
|
Portland
|
5.23
|
3.56
|
4.51
|
|
WI
|
Madison
|
4.85
|
3.28
|
4.29
|
MI
|
Sault Ste. Marie
|
4.83
|
2.33
|
4.20
|
|
WV
|
Charleston
|
4.12
|
2.47
|
3.65
|
MI
|
E. Lansing
|
4.71
|
2.70
|
4.00
|
|
WY
|
Lander
|
6.81
|
5.50
|
6.06
|
MN
|
St. Cloud
|
5.43
|
3.53
|
4.53
|
|
|
||||