How the inverter controls the preferential use of solar power generation

Are you referring to grid-tied inverters? If it is a grid-connected inverter, it does not need to be controlled, and the electricity generated by solar energy is preferred, and the insufficient part is supplemented by the mains.

For example, the power of the load is 500W, the working current is 3A, the inverter is 500W, and the mains voltage is 220V when connected to the grid, so the current output of the inverter is 500W 220V=, so it is necessary to supplement the insufficient current with mains. In this way, the power replenished by the mains is:

Didn't understand your question too much. Does your solar system charge the battery in multiple ways? If there are two options I can provide, it is to choose between mains power and solar power.

When solar power is generated during the day, the mains power is disconnected, and if the battery is not powered at night, it will automatically compensate the mains power to the battery when it reaches a certain voltage value.

What you want to say about the preferred solar technology is whether you want to convert solar energy to a higher efficiency, including the photoelectric conversion efficiency of the panel and the conversion efficiency of the inverter, generally the current efficiency of the solar panel monocrystalline silicon is about 15-17%. The photoelectric efficiency of the grid-tied inverter can also improve the conversion efficiency of the panel through MPPT (Tracking Detection of the Maximum Power Point). The highest conversion efficiency is between 96-97%.

There's no control over this, you can add an interlocking device.

Solar energy resources are inexhaustible, and the amount of solar energy reaching the earth is 6,000 times greater than the energy currently consumed by human beings. Moreover, solar energy is widely distributed on the earth, and photovoltaic power generation systems can be used wherever there is sunlight, regardless of region, altitude and other factors.

Solar energy resources are available everywhere, and they can be supplied nearby without having to be transported over long distances, avoiding the loss of power caused by long-distance transmission lines.

The energy conversion process of photovoltaic power generation is simple, it is directly from light energy to electrical energy, there is no intermediate process (such as thermal energy to mechanical energy, mechanical energy to electromagnetic energy, etc.) and mechanical movement, and there is no mechanical wear. According to the thermodynamic analysis, photovoltaic power generation has a high theoretical power generation efficiency, which can reach more than 80%, and the technology development potential is huge.

Photovoltaic power generation itself does not use fuel, does not emit any substances including greenhouse gases and other exhaust gases, does not pollute the air, does not produce noise, is environmentally friendly, and will not suffer the impact of the energy crisis or fuel market instability, and is a new renewable energy source that is truly green and environmentally friendly.

The photovoltaic power generation process does not require cooling water and can be installed on the desert Gobi where there is no water. Photovoltaic power generation can also be easily combined with buildings to form a photovoltaic building integrated power generation system, which does not need to occupy a separate area and can save valuable land resources.

Photovoltaic power generation has no mechanical transmission parts, simple operation and maintenance, and stable and reliable operation. A photovoltaic power generation system can generate electricity as long as there are solar cell modules, coupled with the widespread use of automatic control technology, it can basically achieve unattended and low maintenance costs.

The photovoltaic power generation system has stable and reliable working performance and long service life. Crystalline silicon solar batteries also have a long lifespan. In the photovoltaic power generation system, as long as the design is reasonable and the selection is appropriate, the life of the battery is also very long.

The working principle of photovoltaic power generation inverter; The direct function of the inverter is to convert direct current energy into alternating current energy, and the core of the inverter device is the inverter switch circuit, which is referred to as the inverter circuit. The circuit completes the function of inverter through the conduction and shutdown of power electronic switches. The on/off of the electronic switching device requires a certain amount of distraction pulse.

These pulses may be modulated by changing a voltage signal. Circuits that generate and regulate pulses, often referred to as control circuits or control loops. The characteristics of photovoltaic power generation inverter are high conversion efficiency, fast start-up, good safety performance, and the product has five protection functions: short circuit, overload, undervoltage, and overtemperature.

The inverter and the solar controller need to be connected by intermediate reserve devices, and the battery is generally selected, the solar controller is connected with the battery for charging, and the battery is connected with the inverter to increase its voltage, and the raised voltage is connected with the solar controller.

The controller is a combination of logic controller and microprogram controller, and both controllers have their own advantages and disadvantages. The combinatorial logic controller is cumbersome to design, complex in structure, and once the design is complete, it can no longer be modified or expanded, but it is fast.

The microprogram controller is convenient in design, simple in structure, easy to modify or expand, and only needs to reprogram the corresponding microprogram to modify the function of a machine instruction; To add a machine instruction, simply add a microprogram to the control memory, however, it is by executing a microprogram.

Hello, the installation configuration of on-grid and off-grid is not the same. Generally speaking, the grid-connected system does not have a battery, he has no power storage capacity, and all the electricity generated is input into the distribution network, and the electricity is also taken from the distribution network, and there is no direct connection between power generation and electricity. The off-grid system has a battery, and the generated electricity is stored for the load.

If you have to find someone to connect the line by yourself, then there are two problems: 1. In use, the line is connected after the inverter, which is exactly the same as the mains, there is no problem, but there is no power storage capacity, that is, the sun is good to use electricity, and it cannot be used on rainy days and nights;

12V battery system;

150W load.

Current 150W 12V

Two: calculate the battery capacity demand:

Illumination 6 hours a day.

It needs to meet the lighting requirements of 5 consecutive rainy days. (5 days plus the lighting of the night before the rainy day, 6 days).

Accumulator days 450a

In addition, in order to prevent the battery from overcharging and discharging, the battery is generally charged to about 90%; About 20% of the discharge remains.

Select controller 15A 12V inverter 220V; The average effective light exposure time of 200W solar panels is 4 hours (h) per day;

Relax the minimum 20% allowance for panel requirements.

wp÷wp＝391w

You only need 900 watts per day, and it is enough to use your 75 watt board at most, 500 watts for the inverter, 20 amps for the controller, and 200 amps for the battery

Solar controller, one controller completes the reverse flow. A small round piece of paper will be placed on the positive and negative poles of the battery, and the positive and negative electrodes will be connected.

At the same time as the solar energy charges the battery, it is completely feasible for the battery to supply power to the outside, in this case, the power used by the load will be preferentially directly used by the solar cell, and the rest is charged to the battery; On the contrary, if the solar cell does not have enough power, it will draw power from the battery at the same time.

When connecting, it is best to use a photovoltaic charge controller, which can control the output voltage of the solar cell and protect the battery from being overcharged.