SPM Physics: Solar Energy

It is almost a year and a half since I 've been using  10 solars led lamp to lights up the outdoor area of my house. Each lamp is rated with 5W if it is fully charged by solar energy.

The lamp is using LDR in which it lighted up automatically when it is dark.

Usually it starts from 730pm and the battery will last up to 6.30am. 

So total hours for a day will be 11 hr.

Now lets calculate how much energy in kilowatt-hour is consumed a day for each lamp:

Total energy consumed a day by one solar LED lamp:

Energy,E = P x t

            E = 0.005kW x 11hr

            E = 0.055 kW hr 

Since I am using 10 lamp..so  total energy per day will be, 

            E = 10 x (0.055)

            E = 0.55 kWhr.

Imagine for a year in average will be 365 days..

So total energy used per year will be….  

           E =(365 days) x 0.55

           E = 200.75 kWhr.

Usually TNB's average rate for  1kWhr =RM0.218

So for a year, On average these 10 lamps should cost me… 

           RM0.218 x 200.75 = RM43.76

The best part is I don’t have to pay anything to TNB as I am using a free source of energy which is the solar energy from the sun.

Can u imagine if all our electrical appliances are powered by solar energy? How much money will be saved a year? The most important part is it is environmentally friendly.

 Let's fully utilize solar energy.

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