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Answers to frequently asked questions about off-grid PV systems

  • July 15, 2021
1. Which equipment is suitable for? Where?
1) The off-grid PV systems is widely used in outdoor outings, nomadic families, farmers, ships, islands, remote mountainous areas, ground satellite receiving stations, weather stations, forest fire observation stations, remote outposts and other places.
2) 500W off-grid system rated power (load capacity) 500W, suitable for TVs, computers, lighting, rice cookers, monitoring equipment, fans, small hand drills, small water pumps, small washing machines, etc. whose power is less than 400W; high-power washing machines and air conditioners cannot be used , High-power refrigerators, high-power electric drills, water pumps, induction cookers, microwave ovens and other equipment, otherwise the system may be damaged.
3) 1000W/1500W off grid solar power system rated power (carrying capacity) 1000W/1500W, suitable for TVs, computers, lighting, rice cookers, monitoring equipment, washing machines, refrigerators, fans, low-power induction cookers with power less than 800W/1200W; air-conditioning, Large refrigerators, high-power electric drills, water pumps, microwave ovens and other equipment, otherwise the system may be damaged.

2. What are the characteristics of the off-grid PV system?
This series of solar photovoltaic power generation system adopts a power frequency inverter with a toroidal transformer structure. The system has low no-load loss, strong load capacity, high operating efficiency, and is more stable than high-frequency inverters.
The system has a built-in AC charger, which is convenient for charging with AC power in rainy days.

3. How much electricity can the system save? How long can it be used?
For example, a 500W off-grid system has a built-in battery of 12V50AH, and the storage capacity is about 0.6 kWh. If the load power connected to the system is a 50W lamp, the approximate time it can be used when fully charged is 0.6KWH*0.7/50W=8.4 hours (0.7 is the battery Depth of discharge coefficient); other types of battery capacity are shown in the table above, and so on.
The off-grid PV system has an external battery port, which can be connected to the battery according to the actual needs of the user. At the same time, this port can also be used to charge the battery with an external charger.

4. How much electricity can the system generate?
For example, a 500W off-grid PV system is conventionally equipped with two 50W solar panels, and places with good solar energy resources generate approximately 0.4-0.6 degrees per day.
The system's maximum support for external solar panels is shown in the table above, and customers can add solar panels as needed.

5. How many voltage outputs are there?
The system has 12V output ports, which can be connected to 12V LEDs for lighting; USB 5V output ports are used for mobile phone charging; 2 220V internationally accepted AC output ports are connected to AC loads.

6. What waveform is output? Is the voltage stable? How is the efficiency?
The output of the system is pure sine wave; voltage is 220V ± 2%; the biggest feature of this machine is power frequency efficiency, no-load loss is only about 8W, and the maximum efficiency of the whole machine is 95%, which is beyond the reach of ordinary solar power system manufacturers on the market. of.

7. How to install the off-grid PV system?
The off-grid PV system is highly integrated. Customers who purchase only need to put the solar panel outdoors, connect the solar panel cable to the corresponding interface of the system to use the machine, and the installation is very simple
Installation tips:
1) Please face the solar panel to the south, and please refer to the local geographic dimension for the inclination angle of the solar panel;
2) If the DC voltage of the solar power system you purchased is 12V (500W), please use multiple solar panels with an open circuit voltage of 18V in parallel;
3) If the DC voltage of the solar power system you purchased is 24V (1000W, 1500W), please connect two solar panels with an open circuit voltage of 18V in series and use multiple groups in parallel, or use solar panels with an open circuit voltage of 36V in parallel.

8. What parameters are displayed on the LCD screen?
Through the page turning function of the LCD screen, you can see the output voltage of the system, the power of the load, the output current, the total power generation, the running time and other 5 technical parameters.

9. How to indicate solar charging?
The solar charging function is indicated by the SOLAR indicator light on the panel, and the green indicator light indicates normal charging.

10. What protection functions does the system have?
DC over-voltage and under-voltage protection, DC over-discharge protection, reverse polarity protection, overload and short circuit protection, overheating protection, to ensure the safety, reliability and good performance of the system.

11. Is the system stable? How many years can it be used? What are the subsequent maintenance costs?
This series of power generation system is the latest product. The system adopts industrial standard design. After years of optimization and replacement, it has high stability and beautiful appearance. It is the first choice for small solar power generation systems.
The design life of the solar host is 15 years, the life of the solar panel is more than 25 years, and the battery needs to be replaced for about 3-5 years depending on the usage.

12. Can electricity be generated in rainy days?
The solar power system needs the sun to generate electricity. If there is sunlight on a rainy day, it can generate some electricity, but the amount of electricity generated will be less than when the sun is good, about 30-50%.

13. What constitutes a solar power station
It is composed of solar power panels + brackets + inverters + special cables, etc.

14. Can my roof be installed?
It only needs a large and strong roof, and both flat roofs and sloped roofs can be installed. Use the idle roof to generate income, but also insulate

15. Will installing solar power stations have any bad effects on my roof?
Install a solar power station with a load-bearing capacity of about 20 kilograms per square meter, which will not affect your roof. The power generation is safe, environmentally friendly and noiseless, and will not adversely affect your living environment.

16. Will it be damaged by lightning, or will it be blown away by the wind?
There is a lightning rod inside the inverter, which will ground the solar energy during installation, so it will not be damaged by lightning. The solar panel bracket is made of high-strength galvanized steel or aluminum alloy by professional manufacturers, which has strong wind resistance.

17. Can the solar power station still supply power after a power outage?
In the event of a power failure, in order to protect your home appliances, the power station will automatically power off. If you want to have electricity in your home during a power outage, you need to buy another battery to store it.

18. How much electricity can a solar power station generate every year? How long can the power station be used after it is built?
The maximum power generation capacity of a 3KW power station is about 3172 degrees, and the maximum power generation capacity of a 5KW power station is about 5287 degrees. The service life of power generation is more than 25 years.

19. What are the components of distributed photovoltaic power generation?
Photovoltaic panels, combiner boxes, inverters, power cords, brackets

20. What is off-grid power generation?
Answer: Off-grid power generation means that the electricity generated by the photovoltaic power generation system is stored in the battery and converted into AC power through the inverter to be used directly by the equipment or directly supplied to the DC equipment without going through the inverter. Connected to the power grid, suitable for mountainous areas, areas without electricity, and islands.

21. Can it resist typhoons and hail?
Answer: The system is designed according to local conditions, and wind pressure, accumulation, and roof style will all be considered.

22. How is the power generation effect in rainy weather?
Answer: It will also generate electricity, but the effect is not very good. If it is cloudy, the power generation is only about 20% of that of a sunny day.

23. Can the power generation be guaranteed?
Answer: It can be guaranteed, and a formal and professional rooftop photovoltaic installer is recommended.
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