Calculation of solar power in a practical example

Every year electricity is to ensure that private houses costs more expensive, and the use of solar energy helps you save money. How best to install solar panels on a private home? Let us try to calculate the payback of the installation of solar panels on the example of one of the projects implemented by the company "Sun Shines".

Solar power plant installed in the Chekhov district of the Moscow region. Part of the plants consists of eighteen polycrystalline solar panels at 300 watts each and a gas generator with a capacity of 13 kW. Dimensions of one solar module amount of 1.96×0,99 m chain Length solar made up almost 18 meters, and their total area — 35 sq. m. For energy storage in plants 16 used gel batteries deep discharge that can save 42 kWh of energy. Uninterruptible power supply unit with a capacity of 12 kW uses solar energy stored in the batteries for providing electricity to electrical appliances at home, and in the case of a large discharge of the batteries and not enough solar energy during the autumn-winter period for charging the batteries will automatically connect the gas generator. Although since February a gas generator never was included for additional energy generation. Summer house has a full supply from solar power.

The cost of solar power is 600 000 rubles (excluding the cost of the generator). The cost of installing individual. It depends on the type of roof mounting options, the length of the cable.

The average energy output of solar power in the summer — 25 kWh per day or 775 kWh per month. For the year the solar power plant produces 6530 kW*h. If the network is already connected to the plot and the rate of 4 rubles per kWh, rubles 26 000 rubles. The payback of solar panels using the existing connection to network without taking into account inflation will be 23 years. If you take a small correction factor in inflation and the rise in tariffs, the payback period of the solar power plant will be approximately 17 years. But the house is fully insured against sudden power outages due to accidents!

What if the house is in a remote area and the connection to the network is missing and in the near future is not planned?

Take, for comparison, a diesel generator of 12 kW average cost of 200 000 RUB When working it consumes 3 liters of fuel per hour, that is, in a year it consumed 26 tons of fuel and the cost of 780 000 rubles per year (30 rubles/liter). It turns out that even if you put a solar power station and as a reserve to supply the smaller generator (8 kW), which will be included in the winter for 1-2 hours per day, the payback of the solar power plant is less than one year! And that's without taking into account the cost of maintenance of the generator and wear and tear.

The gas generator is undoubtedly more beneficial compared to diesel. Gas generator 13 kW is 270 000 RUB., Consumes 8 cubic metres per hour. For the year is 70 000 cubic meters, and in rubles — 305 000 (for 4300 rubles per 1,000 cubic meters). And it's also without taking into account the maintenance of the generator. It turns out the payback period of solar panels compared to installing the gas generator will be slightly less than two years.

In some areas, the connection of the site to the city grid is from 50 to 500 thousand rubles. Many customers who were billed for the power connection of about 200 000, acquired company "Sun Shines" power of 4-6 solar panels cost 140 000 and received a stable electricity supply for the summer period. Savings amounted to 60 000 rubles in comparison with connection to the mains. In this case, power from solar pays for itself instantly and from the first day of its usage can already be considered profit, which is expressed in the resulting "green kilowatts". But if the bill for the network connection is 500 000? In this case, the savings would amount to 360 000!

To summarize, we can conclude that the individual is an Autonomous power system profitable operation. The cost of solar panels will be repaid through savings on utility bills. Solar energy is free and completely safe for the environment. On average, the payback period for solar is about five years, and the service life is 30-50 years.published


P. S. And remember, only by changing their consumption — together we change the world! ©



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