I spent 90,000 to install a rooftop photovoltaic power station with a capacity of 297 kilowatts, last year a total of 24,850 kilowatts of electricity, I used more than 3,000 kilowatts of electricity, sold more than 21,000 kilowatts of electricity to the grid, got 8,300 yuan of electricity sales income, self-consumption savings are equivalent to saving 1,440 yuan, paid 190 yuan in taxes, equivalent to about 9,500 yuan of return to the capital.
Friends who know a little bit about photovoltaic should know that the grid-connected method I use is "surplus power grid", which means that I use it myself first, and then sell the rest to the power grid.
There are two main ways to connect home rooftop PV to the grid, in addition to "surplus electricity to the grid", there is also "full grid". "Surplus electricity grid" is also divided into two types: installing energy storage and not installing energy storage.
Energy storage is to install a battery device between the inverter and the meter, and the photovoltaic panels will charge the battery while supplying you with power during the day, and the battery will be sold to the grid when the battery is full. At night, the inverter from the battery is converted into AC power for your use, so that you can also use your own electricity at night, and only when the battery runs out, you can use the public electricity, which can save more money.
Why don't I install photovoltaic energy storage equipment?
First of all, I'm afraid of fire. Do you know how the rule that battery cars and batteries are not allowed to be charged at home came about, right? In the event of a fire, the lithium battery is deflagrated, and it is very difficult to escape. The battery capacity of the energy storage device is dozens of times larger than the battery of the electric vehicle, and you can refer to the spontaneous combustion effect of the electric vehicle. The storage capacity of electric vehicles is generally 60 100 degrees, and the requirements for fire protection are very high.
Second, energy storage wastes electricity. Photovoltaic panels generate electricity, and then store it in the battery, which will produce a certain efficiency loss, and the power of 10 kWh may be stored in the battery There may be 9 kWh. Then the battery is discharged, and the inverter is converted into alternating current and there is an energy loss, and there are two more energy losses back and forth, and the total loss may be as high as 20%, which is equivalent to extending the payback period.
Third, energy storage equipment is expensive. My home can often use more than 100 kilowatt-hours of electricity at night, if you install energy storage, at least more than 100 degrees of equipment, more than 100 degrees of energy storage equipment, more than 150,000 yuan, with automatic cooling and fire protection facilities, enough for me to install two more photovoltaic roofs, the gains outweigh the losses, and may never be able to return to the cost.
Self-use 100 kilowatt-hours of electricity, only to save 20 yuan of electricity price, a year to save up to 7,000 yuan, it will take more than 20 years to earn back the money of energy storage, do you think energy storage equipment can last for 20 years? So, naturally, I don't install energy storage.
By the way, it was still cloudy today, but in the afternoon the clouds gradually faded and became cloudy. Although you can't see the sun, you can occasionally see a little blue sky between the clouds. So today's power generation is okay, twice as much as yesterday, 368 kWh of electricity is equivalent to earning back the money of a meal of snail noodles.