To the sun!

Total power

Over the years, we have installed a large number of solar panel parks with a total capacity of 5MW.

Reduced CO2 emissions 250kg+

One of our goals is to move towards a greener world. By selling our panels, we have managed to prevent 250kg of CO2 emissions.

Number of projects 20+

Over the years, we have set up a large number of parks all over Estonia. There are already more than 20.

Join the team!

We are looking for new members for our team! Tasks include installing solar panel frames and panels.

Experience is not important, as on-site training is required. The bonus is the existence of a category B driving license, as we also provide a vehicle. Opening hours are 8:00 to 17:00, lunch 12:00 to 13:00. We offer a gross salary of 1500 €.

We expect accuracy, correctness and honesty from the candidate.

Eron Sakur
+372 5178373

Our new warehouse and production building!

Rebase, Tartu maakond

Eron Sakur
+372 5178373



What is an inverter and why do I need it?

An inverter is a type of electrical device that converts a solar panel's direct current (DC) into alternating current (AC). Most household appliances run on AC power. Even devices that use DC power (laptops, cell phones, batteries, etc.) have a built-in converter to convert AC power to DC power. Harold offers Sungrow, Sofar Solar, Fronius and Solaredge inverters for their safety, reliability and arc flame detection capability.

How long is the lifespan of solar panels?

The solar panels offered by Harold last for at least 25 years, after which 80% of the initial productivity is guaranteed.

How long is the payback period for solar panels?

In our experience, the payback period is usually 6-10 years. As electricity prices continue to rise, payback periods will shorten further. One of the most important aspects is self-consumption - the more solar energy you consume, the shorter the payback period.

What happens in cloudy weather?

Solar panels can use direct or indirect sunlight to produce energy, but they don't work as well on cloudy days as they do on bright sunny days. Although estimates vary, solar panels produce about 10-25% of their normal power on a cloudy day.

How can I monitor the productivity?

Inverters allow the user to analyze electricity generation and identify installation problems and errors online and through apps.

Can panels be added later?

If your inverter is capable of receiving more energy, it is possible. Contact our team for more information.

Warranty conditions

2-year installation, 10-year product and 25-year productivity guarantee. Read more about the warranty conditions here.


Batteries are a great way to store solar energy for later use. Using electricity stored in the battery may be cheaper than buying it online.