Solar Energy Calculator

Applying this energy calculator you can calculate how much energy an Sunflower solar collector will produce each day/month/year. The application of this energy is depends on you. You can use it for bathing and washing clothes, or central heat a building. Actually one integrated system can have these functions.

You can also apply these values to help you to calculate how much energy you can save by using an Sunflower solar collector.

In order to calculate energy output you need to input the following variables:
Insolation Level - Before the calculation of your energy output, you need to know the value of insolation level at your place. Those values are available at the insolation page. Take note of your maximum and minimun insolation levels throughout the year as well as the annual average value. When calculating potential energy savings, input annual average insolation, and pay attention to the "per year" energy output value.
Energy must be input in the unit of kWh/m2/day. 1 kWh/m2/day = 317.1 Btu/ft2/day

Collector Size - You need to enter the collector size in absorber surface area.
The absorber surface areas of the different tube sizes are as follows:
- 58/1800 = 0.08m2 per tube. So an Sunflower AP 20 tube = 1.6m2 absorber area
- 58/1500 = 0.067m2 per tube

Energy Cost - Enter the consumption of ebergy in the unit of per kWh in your local currency
(may need to convert from m3 or Therms)
1 therm = 29.3kWh = 100,000Btu = 105.5MJ
Natural Gas is 39MJ/m3 = 10.83 kWh/m3
LPG Propane (liquid) = 25.3MJ/L = 7kWh/L
LPG Propane (gas) = 93.3MJ/m3 = 25.9kWh/m3

 Insolation Level = kWh/m2/day Absorber Area = m2 Electricity Cost = \$/£/€ per kWh (click twice) Energy Output Per Day = kWh Per Month = kWh Per Year = kWh = Btu = Btu = Btu = \$/£/€ = \$/£/€ = \$/£/€