String Inverter or Microinverters? Which Is Best

Solar panels generate direct current (DC) electricity, which needs to be converted into alternating current (AC) electricity for use in homes and businesses. This conversion is performed by solar inverters, which come in various types, including string inverters and Microinverters. Each type has unique advantages and considerations, and understanding these can help you choose the best inverter technology for your needs.

 

Understanding String Inverters

In a Solar PV system, a string refers to a series of solar panels connected together to form an array. The combined DC electricity from these panels is sent to a string inverter, a standalone unit typically installed inside the property. String inverters optimise the performance of the entire string using Maximum Power Point Tracking (MPPT), which maximises power output from each panel.

The size of the string inverter depends on the power and number of solar panels. Single-phase string inverters usually range from 2kW to 6kW and have two MPPT ports, but larger installations may require multiple inverters.

 

Advantages of String Inverters

• Affordability: String inverters are cost-effective because they handle the conversion for multiple solar panels, reducing hardware and labor costs.
• Variety: Many reputable brands, such as Fox ESS, Givenergy, and Hanchu, offer a wide range of string inverters.
• Monitoring: String inverters come with systems that allow users to monitor the performance of each string, aiding in energy management and issue detection.

 

Disadvantages of String Inverters

• Reduced Efficiency: The performance of the entire string can be affected by one shaded, dirty, or faulty panel.
• Limited Expansion: Expanding the system may require additional string inverters, increasing costs.
• Challenges in Monitoring: String inverters don’t provide module-level data, making it harder to identify individual panel issues.

 

Understanding Microinverters

Microinverters are small inverters installed directly behind each solar panel, converting DC to AC at the panel level. This setup allows each panel to operate independently, ensuring maximum power output regardless of individual panel conditions. Enphase Energy is a leading brand in microinverter technology.

 

Advantages of Microinverters

• Individual Panel Monitoring: They provide detailed monitoring of each panel’s performance, making fault detection and resolution easier.
• Modularity and Scalability: Expanding the system is straightforward, as new panels with Microinverters can be easily added.

 

Disadvantages of Microinverters

• Maintenance: Microinverters can be challenging to maintain, as accessing them requires getting on the roof and unmounting panels.
• Cost: They are more expensive on a per-watt basis compared to string inverters, although this cost may be offset by higher system output over time.

 

Choosing the Right Inverter for Your Solar System

The choice between string Inverters and Microinverters depends on several factors, including system size, shading conditions, design layout, budget, and monitoring preferences.

Microinverters are ideal for systems with shading issues, complex roof designs, or the need for detailed monitoring. They offer higher energy yield and better safety but come at a higher initial cost. String inverters, on the other hand, are more affordable and suitable for straightforward installations with consistent sunlight.

If you’re uncertain about which inverter to choose, our team at Bishops Solar can help. As award-winning solar panel installers in the South West, they have the knowledge and experience to guide you in selecting the best solar solution for your home or business.

 

Please contact us for more information and for a free quotation 🔌💚