Top Factors to Consider When Deciding on Microinverters or String Inverters

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Did you realize that inverters play a central role in solar installations, just like solar panels? While solar panels generate direct current (DC) electricity, your home operates on alternating current (AC) electricity. Inverters bridge this gap by converting DC electricity into AC electricity, powering your household appliances.

Selecting the appropriate inverter for your solar panel system can significantly impact its cost and performance. Typically, your installer will suggest a specific type or brand, but being knowledgeable as a consumer can ensure you’re investing in the right equipment.

There are three primary types of solar inverters: string inverters, optimized string inverters (combining power optimizers with string inverters), and microinverters. We’ll assist you in determining which type best suits your solar panel system.

String Inverters: Cost-effective Option for Straightforward Roofs

String inverters have been a staple in the solar industry for years due to their reliability and affordability. In this setup, solar panels are grouped into “strings” and connected to a single centralized inverter, converting DC electricity into usable AC electricity. While they may not optimize individual panel performance, they’re suitable for roofs without shading concerns, offering easy installation and lower costs.

However, if shading affects your panels’ performance, optimized string inverters may offer a solution:

• Centralized DC to AC conversion + panel-level optimization

• Individual panel optimization for improved efficiency

• Both system and panel-level monitoring available

• May require additional central inverter for future expansions

Optimized string inverters combine the benefits of string inverters and microinverters. Each panel is equipped with an optimizer to mitigate shading effects, optimizing performance at the panel level. This setup enhances system efficiency, making it a suitable compromise for shaded roofs without the higher cost of microinverters.

Microinverters: Ideal for Future System Expansion

Microinverters, a type of Module-Level Power Electronics (MLPEs), are a popular choice despite their higher cost. They convert DC electricity from solar panels into AC electricity directly on the roof, eliminating the need for a separate string inverter. Typically mounted behind or next to each panel, microinverters offer individual panel optimization and monitoring capabilities.

If you anticipate expanding your solar system in the future, microinverters provide flexibility and scalability. Unlike string inverters, which may require additional inverters for system expansions, microinverters allow for seamless integration of new panels without compromising performance.

While microinverters offer benefits such as enhanced performance and panel-level monitoring, they may not be necessary for all installations. For south-facing roofs with minimal shade, a string inverter may suffice, offering a more cost-effective solution. However, for roofs with complex configurations or shading issues, microinverters can significantly improve energy production and long-term savings.

Ultimately, the choice of inverter depends on factors such as roof orientation, shading, and budget. Discussing your options with a professional installer can help determine the most suitable solution for your specific needs and maximize the performance of your solar panel system.