Calculating the cost of solar power generation equipment
Generally, solar panels cost 2 yuan per watt, or 2,000 yuan per kW.
In General, the daily electricity consumption of ordinary households is 10 kilowatt hours (including heating in winter and heat in summer) Air conditioning refrigerator) about 3650 kilowatt hours of electricity per year = 3650 kWh
The total consumption of electricity in one year is calculated, then the daily electricity production is calculated
The calculation method is as follows
< p>3650 kWh divided by 365 days = 10 kW divided by 'solar system power generation conversion efficiency 0.75 = 13.3 kW (0.75 is the power generation system including the battery conversion efficiency), which means that to get 10 kW of available power requires at least 13.3 kW of daily power generation.Next, calculate the daily efficiency of production of available solar power (because it is impossible for the solar power system to produce electricity at full power all the time. There is also a coefficient of electricity production such as cloudy days, sun angle changing with time, etc.), taking Beijing as an example, the average sunshine duration is 2780.2 hours (the national sunshine time is calculated as 2000 hours)
2000 divided by 365 = 5.4 hours per day, and the sunshine time is discounted for solar systems (the coefficient is 0.6)
5.4 times 0.6 = 3.24 hours, that is, the daily full energy production time is 3.24 hours.
It is known that the required daily energy production is at least 13.3 kW divided by the time to complete energy production 3.24 = 4.1 kW. It turns out that the required capacity of the solar panel is 4.1 kW. Here, round the whole number and set it to fonction of 5 kW.
The most suitable price for solar panels on the market is 250 W per piece (around €500). yuan per piece)
5000 divided by 250 = 20 cells. The operating voltage of each cell is 24 V multiplied by 20 panels = 480
It is better to choose 96 V for the. system voltage. 480 divided by 96 = 5 panels in series
If we use 20 panels in series, we still need to connect the remaining panels in parallel. Divide 20 panels by 5 = 4
The final panel combination configuration is (5 in series and 4 in parallel)
The above configuration can ensure that the production of 'daily electricity reaches 10 kWh, which corresponds to generating 10 degrees of electricity every day< /p>
But this is not possible without photovoltaic energy production, because at night there is no of sunshine and there will be no electricity production, so batteries are necessaryto store energy.
Let's calculate the battery. configuration
A single battery on the market is generally 12V.
The solar system voltage is 96V divided by 12V = 8 batteries (selection of battery capacity battery based on twice the system capacity).
The known capacity of the battery panel is 5 kW 5000 Wh divided by 96 V = 52 Ah 52 Ah multiplied by 2 = 104 Ah (market battery specifications are 12 V 105 Ah) . The maintenance-free power battery is about 650 low-cost batteries and starter batteries are not suitable. for solar power generation (battery durability is not as good as electric batteries)
Photovoltaic energy storage still cannot be used and a frequency inverter is required to convert 96V system voltage to 220V civil power
The battery capacity is 10 kWh and theinverter should also be equipped with a capacity of 10 kW about 8000-9000 yuan
A solar power generation system can only be built if all of the above are required
Now calculate the cost
20 pieces of 250W solar panels cost 10,000 yuan
8 pieces of 105Ah batteries cost 5,200 yuan
The inverter costs 9,000 yuan
Other metal brackets cost 1,500 yuan
Total 25,700 yuan
Here is the cost of a solar system< /p>
It's beautiful, but it's not at all profitable. It is much more expensive to use mains electricity. it's in remote mountainous areas, it's really not cost effective.
Calculate the annual cost. The electricity is 3,650 kilowatt hours, which is about 0.5 yuan for civilian electricity. The electricity bill is 1,825 yuan per year. 25700 divided by 1825 = 14 years. It will take 14 years to recoup the cost. In fact, the system istotally problem free. The actual situation is that the battery is about 5-7 years old. be replaced every year, which represents another expense.
The current outlook for solar energy production is not very good.