How much electricity can the photovoltaic battery store?

Solar power equipment cost calculation

Usually the solar cell panel 2 yuan per kw2000 membered 1w

General household daily electricity consumption are 10 degrees (including winter heating, summer heat air conditioning refrigerator) about 3650 degrees a year = 3650kwh

The total electricity consumption for one year is calculated, and then the daily power generation is calculated.

Calculated as follows

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

Next, calculate the daily solar power generation efficiency (because it is impossible for the solar system to generate enough power every moment, there is a power generation coefficient such as cloudy, the sun changes angle with time, etc.). Taking Beijing as an example, the average annual sunshine time is 2780.2 hours (the national sunshine time is 2000 hours)

2000 divided by 365 = 5.4 hours a day, sunshine time for the solar system is also discounted (coefficient of 0.6)

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

It is known that the required daily power generation is at least 13.3kw divided by the full power generation time of 3.24=4.1kw to obtain the required solar panel capacity of 4.1kw. Here, the integer is set to 5kw.

The price of solar panels sold in the market is suitable for 250w (approximately 500 yuan)

5000 divided by 250 = 20 pieces of each working voltage to take 24V24V multiplied by 20 panels = 480

System voltage selection 96V is good 480 divided by 96=5 battery panels in series

We use 20 pieces of battery board, the light series is not enough, we have to parallel the remaining battery board 20 divided by 5=4

Finally, the battery board combination configuration is (5 series 4 parallel)

The above configuration can ensure that the daily power generation reaches 10kwh, that is, 10 degrees per day.

But the photovoltaic power generation does not exist, because there is no sun in the evening and it will not generate electricity. Therefore, it is necessary to store the battery.

Let's calculate the battery configuration

The market single battery is generally 12V

Solar system voltage 96V96v divided by 12v = 8 batteries (battery capacity is selected by double the system capacity)

Known battery board capacity is 5kw5000wh divided by 96v=52ah52ah multiplied by 2=104ah (market battery specification is 12V105ah) Maintenance-free power battery is about 650 low-cost battery, start-up battery is not suitable for solar power generation (battery durability is not as good power battery)

Light power storage or electricity can not be used still need a 96V system voltage to 220V civilian power supply power frequency inverter

The battery capacity of 10kw inverter also needs to be equipped with 10kw capacity of about 8000-9000 yuan

When the above is complete, it is considered to have set up a solar power system.

Now calculate the cost

20 pieces of 250w solar panels 10,000 yuan

105ah battery 8 5200 yuan

Inverter 9000 yuan

Other wire brackets, etc. 1,500 yuan

Total 25,700 yuan

Here is a set of solar system costs

It looks very good but it is not worthwhile. It is more expensive to use the city. Unless it is in the remote mountains, it is really not worthwhile.

Calculated annual electricity consumption of 3650 degrees of civilian electricity 0.5 yuan or so a year 1825 yuan electricity bill

25700 divided by 1825 = 14 years to 14 years to recover the cost. This is still completely trouble-free operation of the system. The actual situation is that the battery needs to be replaced in about 5-7 years, and it is an expense.

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

Solar power system battery selection, generally choose large-capacity energy storage battery, small current charge, small current discharge, so long service life, system performance is stable.

If the installation area has a low temperature of -10 degrees or less, it is recommended to consider using a solar gel energy storage battery.

I am a professional sales of solar power equipment, solar panels, batteries, solar controllers, inverters, if you have any questions, please contact me, contact information in Baidu know user information.

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

In fact, both of them belong to lead-acid batteries, but the latter is new. The advantages are high temperature and low temperature resistance, high capacity, and the disadvantage is that the price is higher, and it is applied to solar street lamps. The former has the advantage of being cheap. The disadvantage is that the temperature resistance is not very good, and it is mostly used in solar power plants.