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Cost calculation of solar power generation equipment

A typical solar panel costs 2 yuan per kilowatt, which is 2000 yuan per kilowatt

The daily electricity consumption of ordinary households is 10 kWh (including winter heating and summer hot air conditioning refrigerators), which is approximately 3650 kWh per year

The total electricity consumption for one year has been calculated, and then the daily power generation will be calculated

The calculation method is as follows

3650kwh divided by 365 days=10kw divided by solar system power generation conversion efficiency 0.75=13.3kw (0.75 is the conversion efficiency of the power generation system including batteries), which means that to obtain 10kw of available power, at least 13.3kw of daily power generation is required

Next, calculate the daily available solar power generation efficiency (as it is not possible for the solar system to generate sufficient power at all times, there is also a power generation coefficient such as cloudy days and the sun changing angle over time). Taking Beijing as an example, the average annual sunshine time is 2780.2 hours (the national sunshine time is calculated based on 2000 hours)

2000 divided by 365 equals 5.4 hours per day, and the amount of sunshine is also discounted for solar systems (with a coefficient of 0.6)

5.4 multiplied by 0.6=3.24 hours, which means the daily full power generation time is 3.24 hours

Given that the required daily power generation is at least 13.3kw divided by the full power generation time of 3.24=4.1kw, the required solar panel capacity is determined to be 4.1kw. Taking an integer here is configured as 5kw

The reasonable price for solar panels on the market is 250W per piece (approximately 500 yuan per piece)

Divide 5000 by 250=20 pieces. Each piece has a working voltage of 24V24V, multiplied by 20 battery panels=480

Choosing 96V as the system voltage is good. 480 divided by 96=5 battery boards connected in series

We use 20 solar panels in series, but it's not enough. We still need to connect them in parallel. The remaining 20 solar panels are divided by 5, which equals 4

The final configuration of the battery panel combination is (5 in series and 4 in parallel)

The above configuration can ensure a daily power generation of 10kwh, which is equivalent to generating 10 kWh of electricity per day

But it's not possible to generate electricity without storing it, because at night there won't be any sun and it won't generate electricity, so a battery is needed to store electricity

Let's calculate the battery configuration below

A single battery in the market is usually 12V per unit

Solar system voltage 96V96v divided by 12v=8 batteries (battery capacity selected based on twice the system capacity)

It is known that the capacity of the battery panel is 5kw5000wh divided by 96v=52ah52ah multiplied by 2=104ah (market battery specification is 12V105ah). Maintenance-free power batteries are about 650 yuan. Low priced batteries and starter batteries are not suitable for solar power generation purposes (battery durability is not as good as power batteries)

Photovoltaic power generation storage still cannot be used, and a power frequency inverter with a 96V system voltage converted to 220V civilian power supply is needed

An inverter with a battery capacity of 10kWh also needs to be equipped with a 10kW capacity of approximately 8000 to 9000 yuan

Only when all the above are ready can we consider building a solar power generation system

Now calculate the cost

20 pieces of 250W solar panels priced at 10000 yuan

105ah battery, 8 pieces, 5200 yuan

Inverter 9000 yuan

Other wire supports, etc. cost 1500 yuan

Total 25700 yuan

Here is the cost of a solar energy system

It looks beautiful, but it's not cost-effective. It's much more expensive to use electricity unless it's in remote mountainous areas. It's really not cost-effective

Calculate the annual electricity consumption of 3650 kilowatt hours, which is around 0.5 yuan per kilowatt hour. The annual electricity bill is 1825 yuan

25700 divided by 1825 means it will take 14 years to recover the cost. This is still a completely fault free operation of the system. The actual situation is that the battery needs to be replaced in about 5-7 years, which is another expense.

The current prospects for solar power generation are not very promising.

The selection of batteries for solar power generation systems generally includes large capacity energy storage batteries, small current charging, and small current discharging, which have a long service life and stable system performance.

If the installation area has temperatures below -10 degrees Celsius, it is recommended to consider using solar gel energy storage batteries.

I am a professional salesperson of solar power generation equipment, solar panels, batteries, solar controllers, and inverters. If you have any questions, please feel free to contact me. If you have any needs, please contact me. The contact information can be found in Baidu's user information.

There are two types of photovoltaic batteries, one is lead-acid batteries and the other is colloidal batteries.

In fact, both of these belong to lead-acid batteries, but the latter is a new one that has the advantages of good high-temperature and low-temperature resistance, high capacity, and the disadvantage is that it is more expensive and often used in solar street lights. The former has the advantage of being inexpensive. The disadvantage is that the temperature resistance is not very good, and it is often used in solar power plants.

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