What Factors Affect the Cost of a Solar Installation?

One of the most common questions we get at RenovaEnergy is: Why does the price of a solar installation vary so much? The truth is, there’s no single price tag—every system is custom-designed. In this guide, we explain the main cost drivers and how to know if you’re getting a fair deal.

Key Factors That Influence the Final Cost

• Annual electricity usage: The more energy you use, the more panels you’ll need.
• Roof size and orientation: These affect how many panels fit and how efficiently they generate energy.
• Panel type: High-efficiency or premium panels are more expensive than standard ones.
• Inverter quality: Its size and technology play a big role in system performance and cost.
• Battery storage: Adding a battery can significantly increase the total investment.
• Installation difficulty: A simple flat roof is cheaper than a steep or complex one.

How Much Does Solar Cost in 2025?

Prices have dropped in recent years, but depend heavily on system size and extras:

• Small system (3 kW): €4,000 – €5,500
• Medium system (5 kW): €6,000 – €8,000
• System with battery: €10,000 – €14,000

What Should a Complete Quote Include?

At RenovaEnergy, our quotes are always turnkey and transparent. They include:

• Solar panels, inverter, and mounting structure
• Custom technical design
• Installation and system certification
• Paperwork for government grants and grid connection
• Monitoring system

How to Know If You’re Getting a Good Deal

The cheapest offer isn’t always the best. What matters is quality, guarantees, and long-term return. RenovaEnergy helps you understand what you’re paying for and why.

Wondering how much your system should cost? Request a free quote from us and we’ll guide you without obligation.