Solar Inverters Explained: String Inverters vs. Microinverters

When people think about solar panels, they usually picture the panels themselves soaking up sunlight on a rooftop. But there’s a critical piece of technology working behind the scenes that makes solar energy usable in your home: the inverter.

In this post, we’ll break down what solar inverters do and compare the two most common types—string inverters and microinverters—so you can understand which might be right for your system.

What Does a Solar Inverter Do?

Solar panels generate electricity in the form of direct current (DC). However, your home—and the electric grid—runs on alternating current (AC).

That’s where the inverter comes in. Its main job is to:

• Convert DC electricity from your panels into usable AC power

• Optimize energy production

• Monitor system performance

Without an inverter, your solar panels wouldn’t be able to power your home.

What Is a String Inverter?

A string inverter is the traditional and most widely used type of solar inverter.

How It Works

Panels are connected together in a series (called a “string”), and that string feeds into a single inverter—usually mounted on a wall near your electrical panel.

Pros

• Lower upfront cost: Typically the most budget-friendly option

• Proven technology: Widely used and well-understood

• Simple installation: Fewer components to manage

Cons

• Performance limitations: If one panel underperforms (due to shade, dirt, or damage), the entire string’s output drops

• Less granular monitoring: Usually tracks performance at the system or string level, not individual panels

Best For

• Homes with consistent sunlight and minimal shading

• Simple roof layouts

What Are Microinverters?

Microinverters are small inverters installed on each individual solar panel.

How They Work

Instead of one central inverter, each panel has its own inverter that converts DC to AC right at the source.

Pros

• Maximized energy production: Each panel operates independently, so shading on one doesn’t affect the others

• Panel-level monitoring: You can track performance of each panel in real time

• Greater flexibility: Ideal for complex roofs or different panel orientations

Cons

• Higher upfront cost: More hardware means higher initial investment

• More components: Potentially more points of failure (though many come with long warranties)

Best For

• Roofs with partial shading (trees, chimneys, etc.)

• Complex layouts or multiple roof angles

• Homeowners who want detailed system insights

Key Differences at a Glance

Feature	String Inverters	Microinverters
Installation	Central unit	One per panel
Cost	Lower upfront	Higher upfront
Efficiency in Shade	Lower	Higher
Monitoring	System-level	Panel-level
Flexibility	Limited	High

Which One Should You Choose?

The right inverter depends on your home, your budget, and your long-term goals.

• Choose string inverters if:

  • Your roof gets consistent, unobstructed sunlight

  • You want a more cost-effective system

• Choose microinverters if:

  • Your roof has shading or multiple angles

  • You want to maximize production and visibility into performance

At SLM Energy Solutions, we help homeowners choose the right solar technology for their unique needs—whether that’s a cost-effective string inverter system or a high-performance microinverter setup.