Your Guide To Solar Ground Arrays

When most people picture solar arrays, they think about roof-mounted solar. While roof-mounted solar is the most common, ground-mounted solar arrays are a great option for many applications.

Why Would You Want A Ground Array?

Ground-mounted solar arrays are an ideal solution if you lack having a south-facing roof or have inadequate space on the roof in this direction. A ground-mounted system may also be a good choice if your roof has obstructions such as vents or dormers, or if you prefer to hide the panels behind your home. The biggest advantage of a ground-mounted array is the ability to control the panel direction and angle at installation for optimal performance. With a traditional rooftop solar array, you are tied to the angle and direction of the roof. Ground arrays also offer easier access to the components of the system for any future cleaning or maintenance.

What Are The Different Types Of Ground Arrays?

At Eagle Point Solar, we focus on two types of ground arrays: pier-driven and ballasted.

Pier-Driven Solar Arrays

With pier-driven arrays, a large pole (or pier) is pile-driven into the ground using machinery. A cross bar is then added to the pier to support the racking and solar panels. At Eagle Point Solar, we go a step further, using 14.5-foot galvanized steel I-beams which we drive into the ground. Generally, the front edge of the panels is 2.5 feet off the ground, with the back edge at 9 feet. This allows for optimal production capability. NOTE: Not all ground arrays are equal. If you are considering a ground-mounted solar array and reviewing bids, be sure to compare the components and framing structures (metal poles screwed into the ground versus pier-driven I-beams etc.).

Ballasted Solar Arrays

Ballasted arrays consist of a heavy concrete block footing with the racking system attached to the top. A ballasted array is a great option if it is not possible to drive I-beams into the ground. These are often used in cases where bedrock is close to the surface.

At Eagle Point Solar, the majority of our ground arrays are pier-driven. It is the most cost-effective and longest-lasting option. Pier-driven also allows the most access around the array and provides the cleanest look.

What Can You Do With The Ground Under & Around The Solar Array?

For those wishing for a low-maintenance approach, you can cover the ground under the solar array with either gravel or mulch over the top of a landscape cloth. You are not limited to this type of option, however. If you are a farmer, for instance, solar panels can provide shade for sheep or livestock in a pasture, without harming the panels or the animals. If you are a gardener, certain vegetables grow well in the shade. You can also plant native wildflowers for pollinators and grasses as cover for smaller animals. It just depends on what is right for your home and lifestyle.

Are Ground Arrays Less Expensive?

No. Ground-mounted solar arrays are typically equal or slightly more expensive for several reasons. They require more time and equipment to install. They often need additional electrical materials because they are farther from the meter and/or electrical panel than a rooftop array would be. Additionally, they require support beams for mounting the solar panels, whereas the roof and home act as the supports for a rooftop array.

Are Ground Arrays Safer?

Generally, ground-mounted systems are safer than roof-mounted arrays during installation and maintenance. This is due to their respective heights off the ground. Roof arrays require a person to access the roof via a ladder or other equipment. This makes installation and routine maintenance riskier, especially during adverse weather.

Will There Be Trenching Or Boring Needed At The Installation Site?

For a solar ground array to function and meet code, wiring must be buried underground from the array to the point of connection for the electric service. There are two options to install the wiring and conduit, boring and trenching. Trenching is the most cost-effective option and involves a machine cutting into the ground from above. Boring also uses a machine to enter the ground and tunnel underneath without disturbing the topsoil or grass. Boring is typically used to go under large surface obstructions like a driveway, parking lot, or shed.

There are a lot of factors to consider when selecting where to install solar. If you have the option of a ground array and are unsure if it is right for you, work with a professional solar company to help determine which option is better to meet your renewable energy goals.