What Is a String Inverter?

Inverters are an integral part of any solar power system. Basically, these components convert the DC power output of the solar panels into AC power that can power regular domestic, commercial and industrial electrical appliances and equipment.

Inverters also play a huge role in optimizing the performance of solar panel systems. String inverters are among the most popular types of inverters available today, thanks to their affordable, durable and reliable nature.

Technological advancements in the design and manufacturing of these inverters have led to major improvements in their performance. Today’s string inverters offer better performance and efficiency than their older counterparts.

To find out more about string inverters, including what they are, how they work, and how they compare with other types of inverters, read on below.

Key Takeaways

• String inverters are essential components in solar power systems that convert DC power from solar panels into AC power for everyday use in homes and businesses.
• String inverters are known for their affordability, reliability, and suitability for applications with minimal shading issues. They have a long history of successful use in solar panel systems.
• While string inverters offer advantages like cost-effectiveness and ease of diagnosis, they may not be the best choice for applications with significant shading. Alternatives like microinverters and optimizers offer more efficient solutions for such scenarios.

What Is a String Inverter?

String inverters bring together all the DC output of the solar panels in your set up into strings, feeding into one inverter. All the DC power flowing from the entire array of solar panels is then converted into AC power by this single inverter.

In most cases, the centrally mounted inverter is placed in your home’s electrical panel box – typically located in the garage or on the side of your house.

Arguably the oldest type of inverters available out there, string inverters were initially suited for use in applications with minimal shading issues.

However, improvements in the efficiency and performance of these inverters have led to increased use in a wider variety of applications. As it stands, when used in the most suitable applications, these inverters are highly reliable and durable.

How Does a String Inverter Work?

Groups of solar panels feeding DC power into a string inverter are connected into several strings through a series connection. Several strings of panels can be connected to a string inverter without any issue.

For instance, if you have a system composed of 15 solar panels, they can be separated into three separate strings – of five individual panels each connected in series – feeding into the central inverter.

In practice, the number of solar panels that can be connected to a string inverter depends on the input voltage rating of the inverter and the output voltage rating of the solar panels.

Since the solar panels are connected in series, any productivity dip in any of the panels in a string will have an equally negative effect on the total output of the entire string.

In simpler terms, the inverter normally caps the total output of a string to that of the panel with the lowest output in that string. As such, these inverters are best suited to applications where the solar panels are affected by minimal or no shading at all.

What Are the Benefits of String Inverters?

In the right application, string inverters are an affordable, reliable and highly efficient option. They have become the most commonly featured type of inverter in domestic solar panel systems over the years.

Here are some of the main reasons why you might want to consider this type of inverter when setting up your solar panel system:

A Reliable Option

String inverters are very reliable. This is one of the main reasons why they have withstood the test of time to become one of today’s most popular inverters for solar panel systems.

For many years, string inverters were the only available option for solar panel users. And, as such, they are based on technology that has been tried and tested successfully for many years.

Affordable

Since you can link an entire solar array, made up of numerous solar panels, to a single inverter, string inverters are considered a highly affordable option.

Furthermore, installing a single inverter in a solar panel system also translates into lower installation costs. Fewer labor hours and less wiring are needed to link the solar panels to the inverter before connecting to your property’s electrical circuit.

Easily Diagnose Issues

Solar panels are built to serve owners/users for many years to come. And when it comes to solar power supply systems, the component that is most likely to fail, or encounter issues, is the inverter. With that in mind, it is important to note that it is easier for users and technicians to troubleshoot and diagnose issues in systems equipped with one inverter.

Fewer Wiring Issues

It is worth noting that the use of string inverters also helps reduce any issues related to improper wiring of the solar power system. Through grouping of panels into strings, string inverters reduce and simplify the nature of the wiring involved.

String Inverters Vs. Microinverters Vs. Optimizers

While string inverters are a great option, they may not be a perfect fit for some applications. In such cases, alternatives such as microinverters or even optimizers may be better suited. To help make the work of choosing the best option from these three alternatives easier, it’s helpful to know how they compare with each other.

String Inverters

The appeal of string inverters is quite clear at this point. However, their associated drawbacks also make them unsuitable for some applications. As previously stated, these inverters normally cap the output of each string of solar panels to the lowest individual output of the panels in the string.

While technological advancements have gone a long way towards improving the efficiency of these inverters, their use is generally suited to applications where shading is minimal.

Microinverters

Unlike the string variety, microinverters work to convert the DC output from solar panels differently. To convert DC power into AC power, each solar panel is connected to its own microinverter, in parallel.

While some microinverters may be designed to work with up to four solar panels at once, using these inverters usually means that the number of inverters should match those panels in a solar array.

By converting the output of each panel separately, microinverters help optimize the performance of the overall system, regardless of individual solar panel output levels. Furthermore, with microinverters, it is possible to monitor the performance of individual solar panels in a solar array – something that is not possible with string inverters.

However, the use of more inverters ultimately increases the likelihood of something going wrong – in terms of inverter failure or wiring issues. On top of this, the installation of microinverters is more demanding and costlier than that of string inverters.

Optimizers

Considered to be a compromise between microinverters and string inverters, optimizers generally have the same benefits (and drawbacks) as microinverters.

Simply put, optimizers are designed to be mounted on individual solar panels. While they do not actually convert the panel’s DC output to AC, they are designed to condition the output before sending it through to a central inverter – string inverter.

The output optimization capabilities of optimizers can help boost the efficiency of a solar power system to levels higher than what is possible with a string inverter alone.

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Conclusion

String inverters are a reliable and affordable option for property owners looking to install a solar power system. And with an average lifespan of anywhere between 8 and 12 years, they are also quite durable.

However, they are still not as efficient as some of the newer alternatives when used in solar panel systems where shading is a serious issue.