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The small solar grid-connected inverter can directly connect the electricity generated by the solar panel to the grid through its output cable without requiring additional equipment. Installation is very convenient and reliable.
We call the system composed of small solar grid-connected inverters and solar panels as SGPV system for short. It includes solar panels, which can be any photovoltaic material such as monocrystalline silicon, polycrystalline silicon, amorphous thin film, etc., and a small grid-connectable sine wave power inverter. The power of the inverter is determined according to the connected panels. The power of the SGPV system can be standardized according to the actual application. The current specifications are mainly small solar grid-connected inverters with a power of 250W, coupled with 250W solar panels to form an SGPV system that can be directly integrated into the grid.
In today’s society, fossil energy sources such as petroleum and coal are becoming more and more tense and will eventually be completely exhausted. Therefore, the use of renewable energy sources such as solar energy and wind energy is an inevitable development direction in the energy field in the future.
Large-scale promotion of solar photovoltaic power generation is an important way to solve the world’s energy and environmental crisis. Solar photovoltaic power generation requires a carrier. One type of carrier is the use of open land, such as desertified and semi-desertified areas, tidal flats, farms and pastures, etc. to build large-scale photovoltaic power stations. This type of power station requires land resources. Like traditional power stations, it requires long-distance construction of power grids for power transmission, high investment costs, and losses during the transmission process.
Another category is the promotion of building-integrated photovoltaics (collectively referred to as BIPV). In this way, all kinds of buildings in the city are used as carriers, and the “wasted and abandoned roof sun and land” are fully exploited, and even the walls, windows, awnings and other resources of buildings are used to expand solar power generation. area.
“Sunshine Roof” has opened up a new model of “nearest production and local consumption” of clean energy, which is environmentally friendly and energy-saving as well as saving land and costs. Therefore, it has become a new energy production method that governments around the world are competing to encourage and promote.
Due to the widespread implementation of the “big grid” power supply method, how to integrate the electricity generated by the “sunny roof” of thousands of households into the big power grid is the biggest obstacle to the promotion of “sunny roof” at present.
The SGPV system is a solar photovoltaic grid-connected system developed to solve this grid-connected obstacle that can be directly connected to the grid.
Compared with the traditional solar grid-connected system, the SGPV system has many obvious advantages:
1. The unit power cost is low, the installation is convenient, and it can make full use of various urban building resources. It can be installed on the sunny side of any building, and the maintenance cost is extremely low.
2. Easy to use in combination. SGPVs can be connected to the grid alone or in an array. The combination is very free, and the number of combinations is not limited by the system itself. You can add or subtract the number of SGPVs in the system as needed. The traditional solar grid-connected system generally connects a group of solar panels in series to obtain a higher input voltage, and then uses a higher-power grid-connected inverter to integrate the electrical energy converted by the solar panels into the grid. , the power of the grid-connected inverter matches the solar panel. However, when the solar panel needs to be added, if the total power of the solar panel exceeds the configured grid-connected inverter, a grid-connected inverter with a higher power must be added.
3. There is no mutual influence between SGPVs in the combined system. The traditional solar grid-connected system is to connect the solar panels in series to obtain a higher output voltage, and then connect to the input end of the grid-connectable inverter. Although the grid-connectable inverter has MPPT (Maximum Power Point Tracking) function, this maximum power point is for the entire solar panel connected in series, if one panel in the system is due to some reasons, such as Fallen leaves, bird droppings, dust, shadows, etc., cause its performance to degrade, which will cause the performance of the entire system to degrade. SGPV does not have the above-mentioned drawbacks. If the performance of a solar panel in a system composed of SGPVs declines, only the performance of the panel itself will decline, and it will not affect the performance of other SGPVs in the system.
4. Improve the efficiency of the whole system. Because the MPPT of the grid-connected inverters in the traditional solar grid-connected system is for the entire system connected in series, the optimization obtained is the optimization of the series-connected system, but not necessarily for each block. Optimisation of solar panels, as the cascaded system has matching errors. However, SGPV is equipped with an independent small solar grid-connected inverter, and the small grid-connected inverter it is equipped with also has the MPPT function, so each panel can work at the maximum power point, which can improve the overall system. efficiency.
5. Its own power consumption is extremely low. Since most of the devices used in the small solar grid-connected inverters equipped with SGPV use digital logic devices and low-power MCUs, their power consumption is very low and will not increase due to the number of small grid-connected inverters in the system. power consumption of the entire system.
1. Connect the output cable of the solar panel to the DC input terminal of the grid-connected inverter, and ensure that the polarity is correct, that is, the positive electrode of the solar panel output is connected to the positive electrode of the grid-connected inverter, and the negative electrode is connected to the negative electrode. The recommended maximum output DC cable size is 8AWG, which can handle 30A of current. For lengths less than 8 meters, too long cables will result in higher voltage drops. Solar panel output power ranges from 20 watts to 250 watts (TEG-250W).
2. According to the AC voltage of your grid, correctly select the specifications of the grid-connected inverter, and turn the voltage selection switch in the inverter to the correct position.
3. Insert the plug of the output AC power cord of the grid-connected inverter into the socket of the household power grid.
4. When the grid-connected inverter detects that both the solar panel and the grid are normal, the grid-connected inverter starts to work and integrates the energy of the solar panel into the grid. The 3 green LED indicators will start to cycle from left to right periodically, the faster the cycle, the more power is being fed into the grid.
5. If the grid-connected inverter cannot detect the existence of mains power when the grid is powered off, it will automatically stop supplying power to the grid to ensure safety. This function is called “anti-islanding protection”.
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