Can you add more solar panels to your system?

Expanding your solar panel system might seem like a great idea if your energy demands have changed or if your household has grown. Adding more panels can boost your home's energy production, especially if you've got spare room on your roof. Installation can be straightforward, provided everything aligns properly.

However, there are some key factors to consider before going ahead. We’ve outlined the essential points you should think about before committing to adding more panels.

Assess Your Current Solar Setup

Before deciding to expand your solar panel array, it's wise to evaluate how well your current system is performing. Depending on its age, expanding could involve fitting challenges or added costs. While the team at Project Solar can assist with queries, understanding your existing system beforehand is crucial.

Understand Your Inverter Capacity

Your inverter transforms DC power from the panels into AC power usable in your home. When installing panels, the inverter is usually sized to handle 80-120% of the expected output. Adding more panels requires checking if your current inverter can manage the extra load. You might need to upgrade the inverter or get a dedicated one for the new panels.

Your Feed-in Tariff

Feed-in tariffs allow you to sell excess energy back to the grid. Keep in mind that any additional panels you install will attract today’s rates, not the original rate when you first set up your system. At present, the feed-in tariff is 12.92p, but this is likely to decrease in the future. This is something to consider if you're weighing whether to install more panels now or later.

Review Your Energy Usage

Before expanding, assess your current energy consumption. This will help you decide how many panels to add and whether it makes financial sense. If you’re already exporting a significant portion of your energy, your current system might suffice. Once you know your usage, you can calculate the number of additional panels needed.

Plan for Extra Panels

The availability of roof space isn't the only factor when considering extra panels. The type and size of your current panels will influence whether you can add more. If your new setup keeps the total energy generation under 3.68kW (16 amps), you’re good to go.

However, if the expanded system exceeds 3.68kW, you'll need to submit a G59 application to the Distribution Network Operator (DNO). This ensures your system fits within the grid framework. Approval can take several months, so plan accordingly.

How Many Extra Panels Do You Need?

This depends on your desired energy boost and what your current system produces. Ideally, stick with the same model as your existing panels, but if unavailable, opt for ones with a similar wattage.

Think About Solar Batteries

Adding more panels gives you a chance to enhance efficiency by investing in solar batteries. These storage units let you sell surplus energy via platforms like Social Energy, potentially reducing your bills or even earning you income.

Do the Math

Ensure adding panels benefits both your energy output and wallet. A minimum addition of 1kW is recommended to justify the expense of extra panels, factoring in savings and feed-in tariffs. You’ll need sufficient roof space and should inspect your roof’s structural integrity first.

Consult the Experts

Deciding to expand your solar panel system is a big step. You want to maximize returns on your investment. Our friendly experts at Project Solar UK are here to guide you, regardless of where you are in your solar journey. Reach out to us today.