A solar inverter functions to convert the variable direct current (DC) output generated by PV solar panels into the alternating current (AC) which is fed into a commercial electrical grid or used by a local, off grid electrical network. Buy the right product for a particular application is very important and there are many factors that go into selecting the best solar inverter. Here are 8 key instructions that you may follow in order to choose the best suited solar inverter for you.
In the solar off-grid system, the photovoltaic controller is to store the electricity generated by the photovoltaic module in the storage battery after transformation. In addition, it also has the functions of protecting the storage battery and preventing the battery from overcharging. At present, there are two main technical routes of the solar charge controller: Maximum power point tracking (MPPT) and pulse width modulation (PWM), both of which have its advantages and disadvantages, so users can select according to different scenarios.
Frequency inverter, mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), brake unit, drive unit, detection unit, micro-processing unit, etc., is a kind of electric control equipment, which uses frequency conversion technology and microelectronic technology to control AC motor by changing the working power frequency of the motor. In general, frequency inverter adjusts the voltage and frequency of output power supply by the breaking of internal IGBT, and provides the required power supply and voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation. In addition, the inverter also has many protective functions, such as over-current protection, over-voltage protection, over-load protection and so on. With the continuous improvement of industrial automation, frequency inverter has also been widely used.
For the current string power inverters, different manufacturers have different technical routes. Single-phase inverters of below 6 kW and three-phase inverters of below 10 kW generally use two MPPT loops. Each MPPT loop is equipped with one string. For the small industrial and commercial projects, power inverters of 20kW to 40kW are usually used. The number of MPPTs ranges from 2 to 4, and each MPPT loop is equipped with 2 to 4 strings. As to the large-scale power stations, high-power string inverters of 60kW to 80kW are generally selected. The number of MPPTs ranges from 1 to 6, and each MPPT loop is matched with 2 to 12 strings.
The photovoltaic off-grid power generation system is mainly used to solve the basic electricity consumption problem for residents in areas without electricity or insufficient electricity. The photovoltaic off-grid power generation system is mainly constituted by the photovoltaic component, bracket, controller, power inverter, storage battery and power distribution system. Compared with the photovoltaic grid-connected system, the off-grid system has an additional controller and storage battery. In addition, the inverter directly drives the load, so the electrical system is more complicated. Since the off-grid system may be the only power source of the user and the user relies more on the system, the off-grid solar system design and operation must be more reliable.
In the photovoltaic grid-tie inverter, there are many input voltage technical parameters: Maximum DC input voltage, MPPT operating voltage range, full-load voltage range, start-up voltage, rated input voltage and so on. These parameters have their own focus and all of them are useful.
Central inverter: The power is between 100kW and 2500kW. With the development of power electronics technology, the string inverter is having an increasingly bigger market, and the central inverters below 500KW have already basically been eliminated from the market. The power device adopts high-current IGBT. The system topology adopts DC-AC first-level power electronic device to transform the full-bridge inverter. The latter stage is generally connected to the double-split power-frequency boost isolation transformer. The protection level is generally IP20. It has a large size and is vertically installed indoor.
As to the photovoltaic grid-tie inverter, the input end is connected to the photovoltaic component and the output end is connected to the power grid. The component has only positive and negative poles, and it is not easy to wire incorrectly. Since the component is a certain distance away from the inverter, it is required to add an extension cable. The correct connection method is that the photovoltaic connector has a female connector on one side and a male connector on the other side, so that the positive and negative directions will not change. However, some green hands will also make the two connectors of the extension cable the same. If the power inverter is connected, the positive and negative poles will be reversed.
The solar energy charge controller is an automatic control device controlling the solar battery array to charge the battery and the battery supplies power to the solar inverter load in the photovoltaic power generation system. It can set the control conditions according to the charging and discharging characteristics of the battery, so as to control the power output of the solar energy battery component and battery to the load. Its main function is to protect the battery and stabilize the working state of the power station. The photovoltaic solar controller can be divided into a switch type controller, a pulse width modulation (PWM) type charge controller, a maximum power point tracing (MPPT) charge controller, and an intelligent controller according to functions and circuit structures.
In the photovoltaic system, the cost of the solar inverter is less than 5%, but it is one of the decisive factors of power generation efficiency. When the accessories such as the component are completely consistent, if different inverters are selected, the total power generation capacity of the system has a difference ranging from 5% to 10%. Such a difference is mainly caused by the inverter. The MPPT efficiency is the key factor determining the PV inverter power generation capacity, and its importance even exceeds the efficiency of the PV inverter itself. The MPPT efficiency is equal to the hardware efficiency multiplied by the software efficiency. The hardware efficiency is mainly determined by the accuracy of the sampling circuit, the MPPT voltage range and the number of MPPT paths. The software efficiency is determined by the control algorithm.
The photovoltaic solar inverters are classified into grid-tie inverters, off-grid inverters, and microgrid energy storage inverters according to their different applications. The grid-tie inverters can be further classified into micro inverters, string-type inverters, concentrated inverters and centralized distributing inverters according to power and usage. The micro inverter has the power class of 180W to 1200W, thus being suitable for small power generation system. The string-type inverter is the single-phase inverter with power from 1kW to 5kW. It is suitable for household power generation system. The three-phase inverter with the grid-tie voltages of 220V, 5kW to 70kW is suitable for industrial and commercial power generation systems. Its on grid voltage is three-phase 380V.
In the photovoltaic off-grid system, the power parameter of the power inverter selecting is generally confirmed according to the load type and power of the user. The load is classified into the following types according to the impedance property: Resistive load, inductive load, and capacitive load. The load is classified into the following types according to the impedance property: Resistive load, inductive load, and capacitive load. The resistive load: The load with no phase difference between current and voltage is a resistive load, such as the electric cooker, bulb, electric furnace, electric soldering iron and so on.
Solar photovoltaic water pumping system, also known as photovoltaic water pump or solar water pump system, converts solar energy into electricity through solar cell modules, and then drives the pump to raise water from low level to high level for farmland irrigation or human and livestock drinking. Solar water pump system project can be built in areas rich in solar energy resources, making modular construction or staged construction according to the fund or industrial development, and realize automatic operation, costs low management fees.
What is Solar Water Pump?
Tuesday, August 20, 2019
There are two main types of solar water pumps. The surface pump is located on the ground and moves water through the pipe. They can move a lot of water slowly. Surface pumps are often found on farms or large irrigation systems where water needs to be moved from the lake to the field. The submersible solar water pump is located underground, but the solar panel is connected on the ground. The submersible pump is used to move water from the well to the surface.
The efficiency of the power inverter is directly related to the generated energy of the system, so it is an important indicator that customers care much about. It is of great importance to increase the conversion efficiency of the power inverter. The only way to improve the efficiency of power inverters is to reduce the losses. The main losses of inverters come from IGBT, MOSFET and other power switch tubes, as well as magnetic devices such as transformers and inductors, which is related to the current, voltage and the process adopted by the selected materials.
A car inverter can convert 12V DC to 110V/220V AC. It is very useful on the go. But many people will be worried about if car inverters are harmful to storage batteries. For all products used in car storage batteries, there will have some impact on the storage battery more or less. Even more, if you fail to operate properly, the impact on the battery will be greater. Therefore, what we can do is to use the car inverters correctly, which will reduce the damage to the car battery.
Pure sine wave inverters output the true sine wave AC power which is the same as or even better than the power grid we use every day since there is no electromagnetic pollution. Pure sine wave inverters, with high efficiency, stable sine wave output and high frequency technology, are suitable for all kinds of loads, which can not only power any common electrical equipment (including phone, heater, etc.), but also run the sensitive electronics or appliances (like microwave, fridge, etc.).
Today we'll introduce how to make a power inverter. This homemade inverter has simple circuit, low cost, easy maintain, and high efficiency. And it can be made by anyone who has a little practical ability. Although this DIY inverter does not have the same high-end and complex switching power supply integrated circuit as high-quality power inverters on the market, as well as field effect power amplification, its effectiveness is not inferior to others.
Car inverter is a device that can convert 12V or 24V DC energy from car battery into 220V or 110V AC power, which is the same as the grid power for household appliances. With the car inverter, you can connect the cigarette lighter or car storage batteries to run the electronics, appliances or various tools, which can greatly broaden the range of entertainment and work in the car. How to choose a right inverter for your car?
In our daily life, most electronic products are used through 110V or 220V AC by switching power supply or some other rectifier circuit to convert AC to DC, and the so-called inversion is the process of converting DC to AC, which is a reverse process of rectifier conversion, so the inverter is named after this. Inverters bring us a lot of convenience in our life, such as outdoor barbecue, outdoor lighting, car refrigerators, etc., which are all used by converting DC power in storage batteries into AC power through inverters. Let's learn about the basic working principle of power inverter.
