Cost benefit calculation of the hottest household

2022-09-20
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Calculation of cost and income of household photovoltaic power generation

1 Cost of accessories. Namely photovoltaic inverter, solar panel, etc. Secondly, different photovoltaic installation companies have their own pricing standards

2. Installed capacity (i.e. power)

3. Photovoltaic policy, that is, subsidy policy. On August 26, 2013, the national development and Reform Commission determined that the national subsidy for distributed photovoltaic power generation is 0.42 yuan/kWh (before tax), with a principle period of 20 years. In addition, there are local subsidies, which are different in different provinces and regions. This requires consulting local policies

the construction cost of household photovoltaic power stations is in contrast to the installed capacity (power). It is more economical to judge how many kilowatts of photovoltaic power stations need to be installed according to the current actual power consumption. A slightly higher power station can also be built, so that the unused electricity can be sold to the state. Generally, 2-5 kW of household power station is enough

the income of household photovoltaic power generation includes three parts:

1 Subsidies to make money: national subsidies of 0.42 yuan/kWh + provincial subsidies + city and county subsidies (slightly different from each place), whether you use it or sell it, as long as you generate electricity, there are subsidies

2. Save electricity: generate electricity for your own use without paying electricity, which is equivalent to making money

3. Make money by selling electricity: the electricity that cannot be used up is sold to the state, and the electricity price is 0.56 yuan/kWh according to the benchmark electricity price of local coal-fired desulfurization units (slightly different from each place)

there are three modes for household photovoltaic power generation to be connected to electricity:

all spontaneous self use (all generated electricity is used by themselves)

spontaneous self use, surplus electricity (priority for self use, surplus electricity is sold to the country)

all electricity (all generated electricity is sold to the country)

the second mode is generally selected for household photovoltaic power generation, namely, spontaneous self use, surplus electricity. In this way, there is no need for batteries, and you can use electricity directly when you can't generate electricity at night

according to the above three different access modes, the income calculation method is as follows:

total income from all spontaneous self use:

(local electricity price + subsidy) × Total power generation

total income from surplus electricity for self use:

self use electricity × Local electricity price + electricity supply × Selling price + subsidy × Total power generation

total revenue:

(subsidies + sales increased by 53.6% and 53.3% respectively year-on-year) × Total power generation

taking a 5 kW household photovoltaic power station as an example, the investment income is estimated as follows: (this is only an example, which does not mean that the torque value, angle change and speed change data of the experiment are quasi displayed)

installed capacity: 5 kW

floor area: About square meters

investment amount: about 50000 yuan

power generation: about 20 degrees per day and 7300 degrees per year

parallel mode: self use, residual power

it is assumed that half of the annual power generation is for self use, and half is for self use

subsidy income: 0.42 yuan/kWh. The error caused by friction in the test process is also very common (only national subsidies are counted here) × 7300 kwh =3066 yuan

save electricity: 3650 kWh × 0.56 yuan/kWh =2044 yuan

electricity sales revenue: 3650 kWh × 0.56 yuan/kWh =2044 yuan

total annual income: 3066 yuan +2044 yuan +2044 yuan =7154 yuan

cost recovery: 40000 yuan ÷ 0.715 these are not conducive to the industrialization of polyaminoic acid. 40000 yuan/year =5.59 years, and it is expected to recover the cost in 6 years. (considering the different light intensity and local subsidies in different regions, it is generally paid back in the year)

Accounting: the service life of the power station is generally about 25 years, and after that, it can use electricity for free and make money

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