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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 Thin-Lite products | 5 Photovoltaics,Batteries, Cable and Wire | 6 Lumen Outputs of Compact Fluorescent and Incandescent Lights | 7 48 volt D.C. fluorescent lights | 8 Low Voltage DC Lights | 9 Why buy Thin-Lite lights? | 10 Thin-Lite Emergency Survival Disaster LED lights | 11 Bogart Engineering Trimetric and Charge Controller Packages | 12 Educational Pages On This Site. | 13 Balanced Battery Charging and Dis-Charging by IOTA | 14 Portable & Emergency Fluorescent Light by Flexcharge | 15 DC Fluorescent Inverter Ballasts by IOTA Engineering and Montana Light | 16 Charge Controller Musings | 17 Bogart Engineering SC-2030 Solar Charge Controller | 18 PV Solar charge controllers with night lighting load by Flexcharge | 19 Thinlite Indoor Fluorescent Lights | 19 A - LED Lighting by Thin-Lite | 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 and Series Battery Bank Information | 26 What we sell and why. | 27 Amps Volts and Watts | CHARGE CONTROLLERS | 28 Emergency and Disaster Preparedness Notes | 29 Photovoltaic Module & System Wiring - Setting Up A PV System | 30 Wind - Hydro - Solar Charge Controllers by Flexcharge | 31 Water and Air Heating Diversion Loads for Charge Controllers | 32 Maximum Power Point Tracking Solar Charge Controllers by Solar Converters | 33 Solar Converters, Inc. Charge & Lighting Controllers | 34 SES Flexcharge Solar Single or Dual Battery Charge Controllers | 35 Thin-Lite ballast replacement installation guide | 36 Solar Converters Special Solar and Battery Charging Equipment | 37 TriMetric Battery System Monitors and Deltec Co. shunts | 38 Timers,Linear Current Boosters,Photoswitch,Voltage Controlled Switches | 39 Battery Desulphator by Solar Converters, Inc. | 40 Solar Converters, Inc. Products | 41 SES Flexcharge Products | 42 QuickCable links to instock products | 43 Thin-Lite products we stock | 44 DC Fuse & Circuit Breaker Types & Installation | 45 Switches - DC rated wall switches | 46 IOTA Engineering IQ4 Smart Charge Controller Owners Manual | 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 Installation and trouble shooting low voltage d.c. lighting | 53 Diodes - Blocking & Bypass, What do they do? | 54 Low Voltage D.C. Lighting Tips | 55 Your On-Line Privacy | 56 Special Order Lenses for Thin-Lite Fluorescent Lights | 57 Thin-Lite Special Order replacement ballasts | 58 Special Order Lenses for Thin-Lite LED Lights | 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 & Post - Cable Lug Covers & Protectors | 62 Heat Shrink Tubing & Cable Lugs by QuickCable | 63 Cable Lugs - Compression Connectors - No Crimping & No Soldering | 64 Heavy Duty Cast Copper Connectors - Lugs | 65 Cable Lugs - Copper Connectors - by Quick Cable - MAX | 66 Cable Lugs - Magna Lug Heavy Duty & Fusion by QuickCable | 67 Anderson SB Connectors | 68 Anderson SB Connector Accessories | 69 Solar Converters Special Order Items | 70 Thin-Lite LED and Fluorescent Comparisons | 71 Overview of Our Photovoltaic Systems | 72 Iota Engineering Battery Chargers / Converters | 73 SAE Connectors, Plugs, Sockets & Cords | 74 IOTA Engineering inverter ballasts | 75 DC to DC Voltage Converters & Dimmers by Solar Converters | 76 Universal Generator Starter switch by Solar Converters | 77 Stranded vs Solid Wire in low voltage systems | 78 IOTA Engineering Power and Lighting products | 79 Thin-Lite Ballast Wiring Layouts | 80 Wire & Cable Gauges and Information | 81 TriMetric 2030 and SC-2030 Wiring Layout | 82 DC to DC Voltage Converters | 83 TriMetric 2030 Battery Monitor 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 Thin-Lite Special Order Fluorescent Models & Pricing | 90 Resources for Disaster & Emergency Preparedness | 91 Thin-Lite Special Order LED Light Models & Pricing | 93 My solar / photovoltaic history | 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 SAE Connector Selection | 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 | How To Videos and Reference by Quick Cable | 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
|
|
|
||||