TrendSetter® Solar Water Heater - Insolation

What is solar insolation?

The amount of electromagnetic energy (solar radiation) incident on the surface of the earth. Basically that means how much sunlight is shining down on us.

Why is knowing the insolation level useful?

By knowing the insolation levels of a particular region we can determine the size of solar collector that is required. An area with poor insolation levels will need a larger collector than an area with high insolation levels. Once you know your region's insolation level you can more accurately calculate collector size and energy output.

What units are used to express Insolation levels?

The values are generally expressed in kWh/m2/day. This is the amount of solar energy that strikes a square meter of the earth's surface in a single day. Of course this value is averaged to account for differences in the days' length. There are several units that are used throughout the world.

The conversions based on surface area as follows:
1 kWh/m2/day = 317.1 btu/ft2/day = 3.6MJ/m2/day

The raw energy conversions are:
1kWh = 3412 Btu = 3.6MJ = 859.8kcal

Is my region's insolation level low, moderate or high?

Examples:
5.89 kWh/m2/day - Very High
2.41 kWh/m2/day - Very Low

Click Insolation Levels to find out the levels in your area.

How do I calculate my collector's size?

Now that I know my insolation level, how do I calculate my collector size? Please click Sizing to visit the collector sizing page.

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Trendsetter Collector

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Cash Rebates

Using solar energy can save you money and reduce your direct impact on the environment. Federal, State and Local incentives are now available to help you achieve your goal of energy independence and to reduce your carbon footprint.


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Plus many states are also offering substantial rebates and incentives to help you achieve your goal of energy independence and to reduce your carbon footprint.