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JOEYOUNG's inverter FAQ
to Help You Know More About the Solar Power Equipments
Frequently Asked Questions about JOEYOUNG Inverter Products
You can find the answers of your ideal products below. If you still have some questions unsolved, contact us and JOEYOUNG would be happy to help.
Choosing the best off-grid inverter requires comprehensive consideration of the following aspects:
- High conversion efficiency: The efficiency of high-quality off-grid inverters should be above 90% -95% to reduce energy loss.
- Intelligent MPPT function: an inverter that supports maximum power point tracking (MPPT) to optimize photovoltaic power generation efficiency.
- Wide compatibility: Suitable for multiple battery types (such as lead-acid and lithium batteries) and various input voltage ranges for photovoltaic panels.
- Stability and durability: Equipped with comprehensive protection functions such as overload, short circuit, and high temperature protection, suitable for harsh environments.
Advantage:
- Energy independence: Suitable for areas without grid access, relying entirely on solar power generation and energy storage to avoid the impact of power outages.
- Flexibility: Adapt to systems of different scales to meet the needs of home, commercial, and industrial scenarios.
- Environmental friendliness: Reduce dependence on fossil fuels and lower carbon emissions.
- Energy storage support: Off-grid systems are usually combined with batteries to provide 24/7 power supply guarantee.
Disadvantages:
- High initial investment: additional battery pack configuration is required, which increases system costs.
- Battery life limit: Regular battery replacement may incur additional maintenance costs.
- Design complexity: Off-grid systems require professional design to ensure that power generation, energy storage, and load demand are matched.
- Energy storage limitations: In prolonged rainy weather, the battery may not be able to meet the load demand.
Classified by output waveform:
- Pure Sine Wave Inverter
The output is consistent with the grid voltage, suitable for sensitive loads such as medical equipment and industrial machinery. - Modified Sine Wave Inverter
Suitable for simple electrical appliances, high efficiency but may cause damage to precision equipment. - Square Wave Inverter
Low cost, but only suitable for extremely low load applications.
Classified by function
- Standard off-grid inverter: dedicated to converting DC power into AC power for load use.
- Hybrid Inverter Integrate MPPT, energy storage management, and grid connection functions, supporting more complex application scenarios.
Classified by power level
- Low power (500W-3kW): suitable for household use.
- Medium power (3kW-10kW): Suitable for small commercial loads such as shops and offices.
- High power (above 10kW): Suitable for industrial and commercial large-scale systems.
Recommended type:
It is recommended to choose a pure sine wave multifunctional off-grid inverter for commercial use, which has high power support and intelligent management functions.
Key parameters:
- Power range
It is recommended to choose models of 10kW and above, which support parallel expansion of multiple units. - Communication interface
Supports RS485/Modbus or WiFi for remote monitoring and management. - Protection level
Choose IP65 or above, suitable for outdoor environments.
A small off-grid power generation system is generally referred to as a system with a power output of tens of watts to 2KW, which is characterized by providing 12V or 24V DC power for users to use.
2KW-50KW is called a medium-sized off-grid system, which is characterized by providing single-phase 220V AC power for users to use.
50KW and above are generally referred to as large-scale off-grid systems, which are characterized by providing three-phase 380V AC power to users for use.
Grid connected inverters will stop working when the power grid is cut off, in order to protect the power grid and equipment itself.
The specific manifestations are as follows:
- Automatic shutdown: The grid connected inverter is equipped with anti islanding protection function, which will immediately stop outputting when a power outage is detected, preventing power feedback to the grid.
- Protect the safety of power grid maintenance: prevent current from flowing back into the power grid during maintenance, which may pose a danger to maintenance personnel.
- No off-grid function: Conventional grid connected inverters cannot operate independently without the grid because they rely on the reference frequency and voltage provided by the grid.
In theory, it can be used through modification, but there are many limitations and risks in practical operation:
- Hardware limitations: The design of grid connected inverters did not consider off grid operation, lacking energy storage battery interfaces and independent voltage/frequency regulation functions.
- Equipment needs to be added: External control devices (such as off-grid controllers) or energy storage battery systems need to be added to enable off grid operation, but the modification cost is high and may affect stability.
- Security issue: Unauthorized modifications may cause inverter failure or pose safety hazards, therefore it is recommended to use dedicated off grid inverters or hybrid inverters to meet off-grid requirements.
Incorrect operation may cause the following problems:
- System damage: If the wiring is incorrect or the input voltage exceeds the range of the inverter, it may cause the equipment to short circuit or burn out.
- Grid failure: If the grid connection parameters are not configured correctly, it may lead to grid instability or back flow.
- Unable to function properly: For example, the power and voltage of the photovoltaic array do not match the inverter, which may result in low efficiency or inverter failure to start.
- Personal safety hazard: Failure to turn off the power during operation may pose a risk of electric shock.
- Suggestion: Carefully read the user manual before using the grid connected inverter, strictly follow the installation and operation specifications, and seek professional technical support if necessary.
Whether choosing a hybrid inverter is suitable depends on specific needs and scenarios:
Suitable situation:
The system needs to support dual modes of grid connection and energy storage.
We plan to add energy storage batteries in the later stage to achieve flexible upgrades.
Energy storage batteries are needed as a backup power source to ensure power supply even in the event of a power outage.
There is a demand for peak valley electricity prices, hoping to reduce electricity costs through energy storage.
Inappropriate situations:
The system is only for simple grid connection needs and has no energy storage or backup power requirements.
The initial budget is limited and there is no consideration for expanding energy storage capabilities in the future.
Sure, Hybrid inverters support operation without batteries, but their functionality may be limited
Grid connected mode:
When there is no battery, Hybrid inverters can directly integrate photovoltaic power into the grid or provide direct power supply.
No energy storage:
Unable to store excess electrical energy and unable to supply power during power outages.
Applicability:
Suitable for users with limited initial budget, batteries can be added later to achieve energy storage function.
The maintenance cost of hybrid inverters is slightly higher than that of ordinary grid connected inverters, but overall they are still economical:
Reasons:
- Technical complexity: Hybrid inverters integrate grid connection, energy storage, and backup power functions, with more complex internal circuits and software.
- Battery maintenance: If equipped with energy storage batteries, it is necessary to regularly check the battery's health status (such as lifespan and charging and discharging efficiency).
- Monitoring system: Some Hybrid inverters are equipped with intelligent monitoring functions, which may require regular firmware updates.
Methods to reduce maintenance costs:
- Choose reliable brands and high-quality equipment to reduce failure rates.
- Regularly maintain according to the manufacturer's recommendations to avoid additional wear and tear.
- If batteries are temporarily not provided, it can reduce maintenance costs related to energy storage.
The main differences between grid tie DC-AC inverters and normal DC-AC inverters are as follows:
Function and purpose:
Grid connected inverters convert DC power into AC power synchronized with the grid, and can transmit excess electrical energy back to the grid. They are suitable for distributed energy scenarios such as solar power generation systems.
Ordinary inverters only convert DC power into independent AC power, mainly used in off-grid power supply systems.
Grid synchronization:
Grid connected inverters need to have the ability to synchronize with grid voltage and frequency, and have anti islanding protection function.
Ordinary inverters do not need to be synchronized with the power grid and can output AC power independently.
Output waveform and quality:
Grid connected inverters have higher requirements for waveform and power factor to ensure that the output meets grid standards.
The output waveform of a regular inverter is relatively flexible, but the quality may vary depending on the design.
Usage scenario:
Grid connected inverters are suitable for grid connected systems, such as household solar power generation.
Ordinary inverters are more suitable for off grid scenarios such as outdoor or backup power sources.
In short, grid connected inverters focus on working in conjunction with the power grid, while regular inverters place more emphasis on independent power supply capabilities.
We provide the following two main output waveform:
Pure sine wave: suitable for equipment with high requirements for power quality, such as precision instruments, household appliances, etc.
Modified sine waves: suitable for cost sensitive applications, such as simple resistive load devices.
Our DC-AC inverter supports multiple input voltage ranges, with common specifications including:
Low voltage inputs such as 12V, 24V, 48V, 72V, etc
High voltage inputs such as 120V, 200V, 400V, etc
The specific voltage range of the model can refer to the technical specifications or contact us for customization.
The main advantages of micro inverters are:
- Modular design: Each photovoltaic panel is equipped with a separate inverter, and faults do not affect the operation of the entire system.
- Higher power generation efficiency: can avoid system efficiency loss caused by single photovoltaic panel obstruction or performance degradation.
- Flexible scalability: It is convenient to add photovoltaic modules without the need to redesign the entire system.
String inverters are suitable for large-scale photovoltaic power plants and usually require centralized management.
Our micro inverter supports the following communication methods:
PLC (Power Carrier Communication): transmits data through the power grid without the need for additional wiring.
Wireless communication (WiFi/ LoRa): enables remote monitoring and control.
Cloud monitoring: Real time viewing of power generation data for each photovoltaic panel through a dedicated app or web platform.
Maximum Power Point Tracking (MPPT): Each photovoltaic panel undergoes independent MPPT optimization to maximize its power generation efficiency.
Avoiding energy loss: Blocking, dust, or photovoltaic panel failures only affect individual modules and will not affect the overall system performance.
We offer the following two main types of controllers:
- PWM controller: suitable for small systems, with high cost-effectiveness.
- MPPT controller: using maximum power point tracking technology, the power generation efficiency is 20% -30% higher than PWM, suitable for medium and large systems.
We offer controllers with multiple power levels:
Small system: 100W-500W
Medium sized system: 1kW-5kW
Large scale systems: 10kW and above
The specific selection needs to be matched according to the system size.
Some models support:
- Parallel expansion: increases system capacity and is suitable for high-power demand scenarios.
- Series Expansion: Supports higher voltage photovoltaic systems and must meet design specifications.
Please refer to the technical manual of the specific model for details.
Solutions for Inverter Design Issues
You can know more about JOEYOUNG from the following questions.
JOEYOUNG has a strong capacity for your products.
From company information to our payment questions, things you may want to know we list in order to help you know better about us.
JOEYOUNG is located in Guangzhou, Guangdong Province, China. Our factory is also in Guangzhou. If you are interested in our company, we are glad to show you around and help you know better about our company.
JOEYOUNG 's factory has a srtong production capacity.
With 8000m² square meters, our factory has over 100 staff and many of them are proffesional in manufacturing inverters.
JOEYOUNG has a group of proffesional engineers for the OEM/ODM customization service and a group dedicated to the research and development of our inverters optimization.
JOEYOUNG's inverters manufacture uses high precision equiments for a high quality products.
We are ISO9001 certified company. JOEYOUNG's products qualification rate remains stable at over 99.9%, way better than othe manufacturer. Our factory has also obtained many international certifications such as CE, IEC and RoHS for meeting the strict quality standards of the global market.
JOEYOUNG is capable of manufacturing inverters from the scratch based on customeres' requirements and supplies ideal products for you. From 3D drawing and inverter structure design services to specific smart system installation, JEOYOUNG is confident of providing satified products.
We can produce 95% of the inverters on the market, but if the price of the inverters is below $20, it is best to inquire with the local supplier as the shipping cost from China to your location may be quite high. Welcome to inquire about JOEYOUNG's high-value inverters.
Leave us a message and our sales team will show you how to design an inverter. Just leave a message or make a phone call, and we can complete the product design together and manufacture your ideal products.
Yes, we can develop hardware and software for inverters, just show us detailed information or requirements.
Of course, please contact us and we will provide you with inverter samples at any time.
Please send us your inverter requirements
1. Inverter voltage
2. Inverter capacity
3. Inverter dimensions
4. Potential Batch Order Quantity
We will find the most suitable solution for you, and then you can pay us through PayPal or credit card.
The delivery time for samples is about 10 days, and the delivery time for bulk orders is about 12-35 days, depending on the order quantity and our order progress.
This depends on the actual situation: if there is inventory, the delivery cycle is 7 to 10 days.
If there is no inventory, it depends on the quantity of your order, usually within 15-35 days.
We accept T/T, Western Union, PayPal, Credit Card, and Alipay if you prefer another payment, please contact us.
We can accept the following trade terms: FOB、CFR、CIF、EXW、FAS、CIP、FCA、CPT、DEQ、DDP、DDU、 Express delivery, DAF, and DES.
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