We have measurement scales for every element. For example, if we have to buy milk, we have measuring scale called liter, if we want to buy sugar, we have measuring scale kilogram. But the question arises that what will be an appropriate measure of a solar panel?

Now we are interested in the amount of electricity a panel produces. However, panels output depends upon the amount of light strike it. Through this method a panel is classified according to the electricity produced under these condition. The measurement is expressed as watts peak (Wp).

In order to get cost per watts peak, we have to divide cost of the panel by its power output. So the cost per watt peak is only one factor in determining the total cost of a photovoltaic system.

The Process

Under standardized conditions, the testing of panel is done. There is difference in panel’s production level depending upon the area in which it is installed. If its installed in a cloudy area, it will produce less electricity as compared to an area where the sunlight exposure is more prominent. Similarly, there are other factors which affect the production of electricity and these factors include climate, amount of shade on the panels etc.

Similarly, in order to get a required amount of electricity under given climate and installation situation, helps in determining that how many panels you will need. So in a home, different number of panels would be required as compared to a larger home where the requirement and usage of electricity is more.

The other factors which affect solar energy costs include the expense of panel but it is only 40% of all the costs. Other expenses are mounts, wiring, inverters, batteries and above all the labor cost.

Now, if we talk about the payback time, that in what time the expenses will be recovered, is roughly 10 to 20 years. But it varies depending upon the condition like if the energy costs go up, the payback time will be less. So solar energy costs can be recovered and its a helpful alternative of energy.

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