Commercial Solar Calculator for Irish Businesses
Most businesses overpay for energy because they’re unsure about their power needs. Our free commercial solar calculator gives you a quick estimate of panel area, energy output, and SEAI grant eligibility for your building. Get your estimate in minutes and start cutting your electricity costs.
The below are standard panel values, but feel free to play around if you are looking for something specific.
If you are going for ground mounting / flat roof mounting, then the mounting equipment normally angles the panels towards the sun. About 37° gets the most annual generation here in Ireland.
Grant Value
Generated
Emissions Saved
Why Use a Commercial Solar Calculator Before You Invest
Every commercial property is different. Roof size, orientation, location, and energy usage all shape whether solar is a strong investment or a marginal one. Our calculator lets you test the numbers before you speak to anyone, so you walk into the conversation with a clear picture of what your building could produce and what grant support you qualify for.
It also helps you compare system sizes. A 20 kWp array performs very differently from a 50 kWp or 100 kWp system, and the NDMG grant rate changes at each tier. Running a few scenarios takes minutes and shows you where the sweet spot sits for your budget and energy consumption.
Most importantly, it removes guesswork. Instead of wondering whether solar makes financial sense for your business, you get an immediate estimate of annual generation, grant value, and roof area. That clarity makes every conversation with an installer more productive.
How to Use This Commercial Solar Calculator
Start with the number of panels and their wattage. The calculator is prefilled with a 50-panel system at 465 Wp each, giving you a 23.25 kWp array. Adjust the panel count to match your needs and the results panel updates your total kWp, annual generation, NDMG grant value, and CO2 savings automatically.
Next, review the roof and ground area inputs. The default panel dimensions and spacing reflect standard commercial installations in Ireland. Select your roof slope, direction, and county, because all three directly affect your output. The calculator uses county-level irradiance data to reflect real Irish conditions.
Once set, hit the calculate button. The Annual Units Generated figure shows your estimated yearly output in kWh. The NDMG Scheme Grant Value shows how much the SEAI would contribute towards your solar installation. These are ballpark figures to help you decide whether a detailed site survey is the right next step.
