![]() ![]() We try to include a copy of your nearby locations with the instrument for US orders. The fixed and 1-axis tracker tables are broken down into tilts of: horizontal, latitude minus 15 degrees, latitude, and latitude plus 15 degrees. Most tables give average, maximum, and minimum values for each month. Units are metric (kilowatt-hour per square meter per day). There are five tables: south facing fixed-tilt collectors, 1-axis trackers, 2-axis trackers, direct-beam concentrating collectors, and average climatic conditions. The data tables have columns for each month of the year and an annual total. The manual mentioned above has a page of tables for each location. Like most NREL numbers, you will likely get a machine. If you have additional technical questions, try 30 or 4648. NREL is an excellent resource, and though it tends toward the large utility scale projects, it is funded by your tax dollars. This is available electronically in more of a spreadsheet format click here to visit the website The data for the 239 sites is available in an excellent 250-page, 1994 publication called, Solar Radiation Data Manual for Flat-Plate and Concentrating Collectors. These correlations were used to estimate solar radiation for 239 sites in the US with extensive weather records. In the United States, a major program was undertaken by NREL (National Renewable Energy Lab) to correlate sparse solar radiation data with available weather data at nearby sites. Please Note: The Solar Pathfinder Assistant software has the NREL solar radiation data already in it. The problem is that there are only a very small number of these locations around the world. This data contains average, maximum, and minimum values for the amount of solar radiation that strikes the collectors at these locations. The best solar radiation data comes from locations that have been collecting this data over a long time period. The amount of solar radiation that actually reaches the earth's surface is measured with these instruments. Clouds, dust, and water vapor scatter and absorb a part of the incoming solar radiation. The best way to account for climatic effects is to take actual solar radiation measurements with special radiation measurement instruments. We need to account for these climatic factors to determine the average amount of solar radiation actually received at a certain location at a certain time. Climatic factors, such as the amount of clouds, dust, and water vapor in the atmosphere are constantly changing. The Pathfinder is primarily designed to determine the percentage of solar radiation blocked by permanent local features in the landscape like trees, hills, and buildings. ![]() The Solar Pathfinder instrument will help you answer the fourth question.
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