Solar Panel Installation Process Explained (2026)
Solar panel installation in Ireland, from survey and design through SEAI approval, roof mounting, electrical integration, commissioning and certification.
Typical on-site installation: 1–2 days
From Survey to Commissioning
Domestic solar PV normally follows a clear sequence: site assessment → system design → grant application → installation → commissioning → certification.
Most domestic systems are installed on site within 1–2 days.
The full project from survey to completion generally takes around 2–6 weeks, depending on scheduling and grant processing.
Initial Survey & Design
A typical site survey takes 30 minutes–1 hour.
It checks roof orientation, pitch, usable area, shading, structural condition, electrical-board capacity and cable routing.
The final design determines panel count, layout, inverter specification and expected annual generation.
Roof Mounting & Panel Installation
Mounting System
Roof hooks or brackets are installed first
Aluminium rails are fixed and tiles reinstated around brackets
Typical mounting time: 2–4 hours
Panel Installation
Panels are aligned and secured to the rails
DC cabling is connected and routed toward the inverter
Typical panel-install stage: 2–3 hours
Typical System Design Examples
| System | Panels | Estimated Annual Output |
|---|---|---|
| 3.8 kWp | 10 | ~3,800 kWh/year |
| 5.2 kWp | 14 | ~5,000 kWh/year |
| 6.5 kWp | 18 | ~6,200 kWh/year |
Panel layout may be adjusted to maximise roof use and reduce shading losses.
Inverter, Electrical Integration & Commissioning
The inverter is normally installed in an attic, utility room or garage and typically takes 2–3 hours.
Electrical integration to the consumer unit usually takes 1–2 hours.
Commissioning includes electrical testing, performance checks, monitoring setup and verification of safety devices.
Full Installation Timeline
| Stage | Typical Duration |
|---|---|
| Survey and design | 1–2 weeks |
| Grant approval | Variable |
| Installation day | 1 day |
| Commissioning and setup | Same day |
| Grant payment processing | 4–8 weeks |
Most domestic systems are operational immediately after installation.
Grant, Documentation & Practical Notes
SEAI Grant
Application must be submitted before installation begins
Installation should wait until approval is confirmed
Grant documentation is completed after the works
Documentation
Electrical completion certificate
Commissioning report
Panel and inverter warranties
Typical Site Scope
Most homes receive 10–20 panels
One inverter is typical
Electrical-board upgrades may be required on some properties
Summary
Most domestic solar PV systems need around 1 day on site, with 1–2 days typical for more involved work.
The complete project usually takes 2–6 weeks from survey to completion.
Good survey, roof access and electrical preparation keep the physical installation short.
Other resources:
Solar Panel Cost After SEAI Grant
Solar Panel Battery Add-On Cost