UPS as Solar Inverter Photovoltaic Grid-Connected Inverters SG250K3

UPS as Solar Inverter Photovoltaic Grid-Connected Inverters SG250K3

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1. Structure of Photovoltaic Grid-Connected Inverters SG250K3 Description

SG630KTL is using low-frequency isolation transformer for protective purpose. Its wider input voltage range ensures more combinations of

the PV arrays. Moreover, optical fiber isolation technology has been adopted to increase its anti-interference ability under the circumstances

of multiple inverters installation. In addition, optimized circuit and structural design has improved system thermal efficiency which enhancing

system reliability and stability. Reinforced protection functions, including the DC ground fault protection, make it the best product for large

scale PV power plant.

2. Main Features of the Photovoltaic Grid-Connected Inverters SG250K3

* Advanced Technology, Grid-friendly

• LVRT, HVRT and zero-voltage ride through to cope with various grid conditions

• SVG function at night, response to grid directives around the clock

• Reactive power control with power factor from 0.9 lagging to 0.9 leading

* More Compact, Saving Space for PV Plant

• Power density enhanced 50%, one of the central inverters with highest power density in the PV industry

• Save installation spaces and lower the plant initial cost

• Front maintenance, able to install against the wall, convenient installation and maintenance, saving operation cost of the PV plant.

* Efficient, More Yields

• Max. efficiency at 97.3% with transformer

• Efficient MPPT control strategy, improve power yields

• 28335 chips adopted, more accurate calculation, more power yields;

• Intelligent speed regulation cooling concept, low consumption, high efficiency

* More Advantages

• Perfect protection and fault alarm system, safe and reliable

• User-friendly dynamic graphics LCD

• Redundant dual power supply solution improving the system reliability

• Efficient PWM algorithm, low consumption of switch

• Operate without power derating at -25℃ - +55℃

• Reliable and continues operation in high altitude environment

• Auxiliary heater (opt.)

• CGC certification, compliance with BDEW

3. Photovoltaic Grid-Connected Inverters SG250K3 Images

SG250K3 PV inverter

4. Photovoltaic Grid-Connected Inverters SG250K3 Specification

MODEL	SG250K3
DC SIDE DATA
Max. DC Voltage	1000Vdc
Start Voltage	500V
MPP Voltage Range	480~850Vdc
Min. DC Voltage	480V
Max. DC Power	284kWp
Max. Input Current	592A
AC SIDE DATA
Rated Output Power	250kW
Max. AC Output Current	397A
Rated Grid Voltage	400Vac
Grid Voltage Range	310~450Vac
Rated Grid Frequency	50Hz/60Hz
Grid Frequency Range	47~52Hz/57~62Hz
Output Current THD	<3% (at nominal power)
DC Current Injection	<0.5% of rated inverter output current
Power Factor	0.9(lagging)~0.9(leading)
SYSTEM
Max. Efficiency	97.3%(with transformer)
Euro Efficiency	96.7%(with transformer)
Protection Degree	IP21
Power Consumption at Night	<80W
Operating Temperature	-25~+55°C
Cooling Method	Temperature controlled forced-air cooling
Relative Humidity	0~95%, non-condensing
Max. Working Altitude	6000m (operation with derating above 3000m)
DISPLAY AND COMMUNICATIONS
Display	touch screen LCD
Standard Comm. Interfaces	RS485
Optional Comm. Interfaces	Ethernet
MECHANICAL DATA
Dimensions(WxHxD)	1006x2034x850mm
Net Weight	1600kg

5. FAQ of Photovoltaic Grid-Connected Inverters SG250K3

Q1. What is the difference between inverter and solar inverter?

A1. Inverter only has AC inpput, but solar inverter both connect to AC input and solar panel, it saves more power.

Q2. What is the difference between MPPT&PWM?

A2. MPPT has higher efficiency, it can track the max power point and won't waste energy.

Q: How does the input current rating affect the performance of a solar inverter?: The input current rating of a solar inverter directly affects its performance as it determines the maximum amount of current that can be supplied to the inverter. If the input current rating is too low, the inverter may not be able to handle the power generated by the solar panels efficiently, resulting in reduced performance. Conversely, if the input current rating is high, the inverter can handle a larger amount of power and perform optimally. Therefore, selecting an inverter with an appropriate input current rating is crucial for ensuring smooth and efficient operation of a solar power system.

Q: Can a solar inverter work without sunlight?: No, a solar inverter cannot work without sunlight as it relies on solar energy to convert the direct current (DC) produced by solar panels into alternating current (AC) for use in homes and businesses.

Q: What is the role of reactive power injection in a solar inverter?: The role of reactive power injection in a solar inverter is to improve the power factor of the system. It helps in balancing the reactive power generated by the solar panels, which is essential for efficient power transmission and distribution. By injecting reactive power, the solar inverter ensures that the system operates at a near unity power factor, minimizing losses and enhancing the overall performance of the solar power plant.

Q: How does a solar inverter handle islanding detection and prevention?: A solar inverter handles islanding detection and prevention by continuously monitoring the electrical grid's stability. It utilizes anti-islanding protection mechanisms to detect any abnormal conditions, such as voltage fluctuations or frequency deviations, that may indicate the presence of an islanded grid. In the event of islanding, the inverter immediately disconnects from the grid to prevent energy feed-in and effectively isolate the solar system. This ensures the safety of utility workers, prevents damage to equipment, and helps maintain the stability of the overall electrical grid.

Q: How does a solar inverter handle reactive power compensation?: A solar inverter handles reactive power compensation by using advanced control algorithms and capacitors. It actively measures the reactive power in the system and generates the necessary reactive power to balance it out. This helps stabilize the voltage and ensures efficient energy transfer between the solar panels and the grid.

Q: How do you choose the right input voltage range for a solar inverter?: To choose the right input voltage range for a solar inverter, it is essential to consider the specifications and requirements of both the solar panels and the inverter. The input voltage range of the inverter should be compatible with the output voltage range of the solar panels. It is important to ensure that the inverter can handle the maximum voltage generated by the panels during peak sunlight conditions. Additionally, factors such as temperature variations and system losses should also be taken into account while selecting the appropriate input voltage range for a solar inverter.

Q: Can a solar inverter be used with a solar carport?: Yes, a solar inverter can be used with a solar carport. The solar inverter is responsible for converting the direct current (DC) generated by the solar panels into alternating current (AC) that can be used to power various electrical devices, including electric vehicles parked under the solar carport.

Q: Can a solar inverter be used in remote areas?: Yes, a solar inverter can be used in remote areas. Solar inverters are designed to convert the direct current (DC) generated by solar panels into alternating current (AC) that can be used to power electrical devices. As long as there is access to sunlight, solar panels can be installed in remote areas to generate electricity, and the solar inverter can then be used to convert and distribute that power for various applications. This makes solar inverters a useful and sustainable solution for remote areas that may not have access to grid electricity.

Q: Can a solar inverter be used with a three-phase electrical system?: Yes, a solar inverter can be used with a three-phase electrical system. In fact, many solar inverters are designed to work with three-phase systems. These inverters are capable of converting the direct current (DC) generated by the solar panels into alternating current (AC) that can be used by the three-phase electrical system.

Q: How does the size of a solar inverter affect its performance?: The size of a solar inverter directly affects its performance. A larger inverter can handle a higher maximum power output from the solar panels, allowing for better efficiency and power conversion. Additionally, a larger inverter can accommodate more solar panels, enabling a larger system size and increased electricity generation. Conversely, using an undersized inverter can lead to reduced performance, lower energy production, and potential system damage. Choosing the right size inverter is crucial for optimal performance and maximizing the benefits of a solar power system.

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