Quick answer: On solar installation day, the crew arrives (often in the morning), runs safety checks, fixes mounting brackets to your roof, clamps the panels on, wires them to an inverter, connects the system to your electrical panel with a short power cut, and tests everything. Most homes take one to two days on site. Grid approval can still delay switch-on.
Solar installation day is shorter and less disruptive than most homeowners expect. It's also less final than they expect. The crew can finish the roof work in a day and you may still wait days or weeks before the system sends power to your home.
This guide walks through the day in the order it usually happens, what you'll see and hear, what to prepare, and what changes if you live in the Gulf, where heat, dust, and utility approvals shape the whole job.
Key takeaways
- Time on site: typically one to two days for a home system. Large systems, tricky roofs, and batteries can take longer.
- Power cut: short. One installer quotes 30 to 60 minutes, agreed with you in advance.
- Switch-on: may come later, after inspection and utility approval.
- In the Gulf: use an installer registered with your utility, ask where the inverter will sit, and plan for dust before the crew leaves.
On this page: Before installation day · Step by step · How long it takes · How to prepare · Gulf considerations · After the crew leaves · Sign-off checklist · FAQ
What happens before installation day
By the time a crew pulls up, most of the work is on paper. A site survey checks your roof's angle, shading, condition, and your electrical panel's capacity. Then the design is finalized, permits or utility notifications go in, and a date is set.
Sunrun, a large US installer, lists six phases: home review and design, permits, delivery and roof prep, installation, final inspection with utility permission to operate, and activation (Sunrun, updated March 2026). Bord Gáis Energy in Ireland describes the same pattern, including a grant application and a utility notification before the install (Bord Gáis Energy, May 2026).
The names of the permits change from country to country. The order doesn't: design, approval, installation, inspection, connection.
Solar installation day, step by step
The sequence below combines the installer guides listed in the sources. Your crew may reorder some steps, but roof work almost always comes first and testing always comes last.
| Stage | What the crew does | What you'll notice |
|---|---|---|
| 1. Arrival and safety | Walks you through the plan, confirms inverter location and cable routes, sets up safety equipment | A short briefing, then vehicles and equipment on your property |
| 2. Mounting | Fixes brackets and rails to the roof structure and seals the fixing points | Drilling and hammering noise |
| 3. Panels | Positions, aligns, and clamps each panel to the rails | The most visible progress of the day |
| 4. Wiring and inverter | Runs cables to the inverter and mounts it | Crew working at your garage, utility space, or an outside wall |
| 5. Panel connection | Connects the system to your electrical panel (fuse board) | A planned power cut |
| 6. Testing | Checks output, electrical safety, and overall performance | Possibly the first live generation reading |
| 7. Handover | Sets up the monitoring app, hands over documents, cleans up | A demo and a folder of paperwork |
1. Arrival and safety walk-through
Crews typically arrive in the morning. One Irish installer says its teams usually show up between 8 and 9 am, introduce themselves, confirm the plan, and agree on the best time for the short power-off (Bord Gáis Energy). Another installer's help page gives a 7 am to 10 am arrival window (installer help center).
What goes wrong here: the inverter spot on the design doesn't match what you pictured. Say so now. Moving it after the cables are run costs time.
2. Roof preparation and mounting
Safety ropes go up, then the rails that the panels will sit on. Brackets are fixed to the roof structure and designed to stop leaks. The hardware depends on your roof: Sunrun says asphalt roofs use stainless steel lag bolts with flashing plates, while clay or concrete tile uses adjustable hooks that slip under the tiles (Sunrun).
Expect noise. Sunrun notes the team seals the holes at the end of the job.
What goes wrong here: a sloppy seal around a fixing point doesn't show up for months, until the first heavy rain. Ask the foreman how penetrations are sealed and ask for photos.
3. Panels placed and clamped
Panels are aligned and secured with clamps. South-facing is ideal in the northern hemisphere, though east-west layouts can also work well (Bord Gáis Energy). Count the panels against your contract. It takes a minute and settles any later argument.
4. Wiring and inverter installation
Cables carry power from the panels to the inverter, which converts it into the kind of electricity your home uses. Sunrun routes wiring through UV-rated conduit to the service panel. Bord Gáis lists a garage, a utility space, or an outside wall as common inverter locations and stresses a cool, accessible spot (source).
In the Gulf, treat "cool" as a requirement and ask for shade. An inverter bolted to a sun-baked west wall is a poor choice.
5. Connection to your electrical panel and the power cut
This is the one step that touches your daily life. Bord Gáis says the interruption runs 30 to 60 minutes and the time is agreed with you beforehand. A Pakistani installer guide puts it at 30 minutes to a few hours in total (Daily Capital).
My practical advice: pick the slot yourself. An hour without air conditioning at 8 am is easy. At 3 pm in July it isn't.
6. Testing and commissioning
The crew switches the system on and verifies output, electrical safety, and performance. Then comes the part some homeowners enjoy most: watching live generation numbers appear on a phone.
Here's the catch. In many places a system can't legally run until the utility grants permission, even when the crew has finished. We'll come back to that below.
7. Handover
You should get a demonstration of the monitoring app, plus electrical certification, warranty details, and support contacts (Bord Gáis Energy). The crew should also clean the work area.
How long does solar installation take?
Most home installations take one to two days on site. Both Sunrun and Bord Gáis give that range, and Bord Gáis adds that the full journey, including approvals, takes a few weeks.
Longer jobs happen. Blue Raven Solar lists a large system, a complicated roof, or a battery as reasons for extra time (Blue Raven Solar). An installer guide for 5 to 10 kW systems in Pakistan lays out a three-day schedule: mounting on day one, panels and wiring on day two, inverter and commissioning on day three (Daily Capital).
Ask your installer for a written schedule with a crew size and a backup day. Vague answers here predict vague results later.
How to prepare for solar installation day
Preparation takes under an hour. The essentials:
- Clear access. Free the driveway, any carport space, and the route to the attic and electrical areas (Sunrun; Bord Gáis).
- Pets indoors. Sunrun's advice: curious pets and loose extension cords don't mix.
- Mark hazards. Point out sprinkler heads near walkways.
- Agree the power-off time. Confirm it the day before.
- Tell the crew what's on the roof. Water tanks, dishes, and air-conditioner units can all affect where panels and cables go. Mention them at the design stage, not on the day.
- Keep your documents handy. Contract, system design, and the utility approval reference if you have one.
You don't need to supervise the roof. Someone should be reachable all day, though, and present at the start and at handover.
Solar installation day in the Gulf: what changes
The crew's work is the same. Everything around it is different: who can legally install, how hot the panels run, and how fast dust builds up.
Approvals come first, and they differ by country
Dubai (UAE). Home systems connect through DEWA's Shams Dubai program. Guides describe four stages: a No Objection Certificate, design approval, inspection and connection, then generation (dubizzle). The application goes through a DEWA-registered consultant or contractor, and DEWA doesn't accept applications from companies that aren't registered under the program (dubizzle). Per DEWA's FAQ, once connected, surplus power goes to the grid and DEWA offsets your bill (DEWA). Other emirates run their own processes, so check with your own utility.
Saudi Arabia. Saudi regulators approved small-scale solar PV rules with a net metering scheme in 2017 (pv magazine, 2017). A trade report dated October 20, 2026 says the regulator, SERA, has proposed a new self-consumption framework with net billing, in which systems up to 11 kW would be exempt from demand and grid connection charges (SMM, October 2026). That's a proposal, so confirm the current rules with your installer and the Saudi Electricity Company before you sign.
Qatar, Kuwait, Oman, and Bahrain. Rules for home rooftop systems differ by country and change often. Confirm the current requirements with your local utility before signing a contract.
Heat: panels run hotter than the air
Panels are rated at 25°C, and output falls as they get hotter. A typical crystalline silicon panel loses 0.3% to 0.5% of its power per degree above 25°C, and panels commonly run 20°C to 40°C above the air temperature (8M Solar). Top-tier panels sit around -0.3% per degree (SunSave).
Worked example (illustrative):
- Assumed panel temperature: 60°C
- Rated temperature: 25°C, so 35°C above rating
- Assumed temperature coefficient: -0.35% per °C (mid-range)
- Power loss at that moment: 35 × 0.35% = about 12%
- With a -0.30% panel: 35 × 0.30% = about 10.5%
That's a loss at the hottest moment, not across the year. Mornings and cooler months lose less. The point is practical: compare the temperature coefficient on the datasheet when you compare panels, and ask the installer to leave an air gap beneath the array so it can cool.
Dust: plan the cleaning before the crew leaves
In a 3.5-month test at UAE University in Al Ain (April to August 2018), panels left dusty for three months lost up to 13% of power compared with panels cleaned daily. Cleaning every 15 days held the loss to about 4% (Shah et al., Sustainability, 2020). At the 300 MW Sakaka plant in Saudi Arabia, soiling losses ranged from 5% to 20% between 2020 and 2024 (KFUPM). Those are test and utility-scale figures, so your roof will differ.
On handover day, ask three things: how will I reach the panels safely, who cleans them and how often, and does the contract or warranty say anything about cleaning methods.
What happens after the crew leaves
Don't assume the system is live because the crew has left. In the US, Sunrun's last two phases are final inspection and the utility's permission to operate, followed by activation (Sunrun). Blue Raven says energization can take anywhere from several days to several weeks after installation (Blue Raven Solar).
In Dubai, the contractor notifies DEWA after installation, and the process covers a site inspection, signing the connection agreement, and meter installation before connection (dubizzle).
Ask for a date range for switch-on in writing, and who is responsible for chasing the utility.
Installation-day sign-off checklist
Before you sign the completion form:
- The panel count and system size match your contract.
- You've seen where the inverter sits and it's shaded and reachable.
- Roof fixing points are sealed and you have photos.
- The monitoring app is set up on your phone.
- You hold the electrical certificate, warranty papers, and support contacts.
- Cables are tidy, labeled, and out of reach of children and pets.
- The crew has cleared away offcuts, packaging, and tools.
- You know when and how the utility will inspect and connect the system.
Red flags on installation day
- Crew members working on the roof without safety ropes or harnesses.
- No written plan, or a design that differs from your contract with no explanation.
- An installer who isn't registered with your utility where registration is required (as in Dubai).
- No paperwork at handover, or "we'll email it later" with no date.
Frequently asked questions
How long does a solar installation take?
Most home systems take one to two days on site. Larger systems, complicated roofs, and batteries can take longer, and switch-on can come days to weeks later if the utility must inspect and approve the system.
Will I lose electricity during solar installation?
Only briefly. One installer quotes a 30 to 60 minute cut while the system is connected to your electrical panel, with the time agreed in advance. Choose a slot that avoids peak cooling hours.
Do I need to be home on solar installation day?
Someone should be available at the start to confirm the plan and at the end for the handover, and the crew needs access to the roof, the attic, and your electrical panel. You don't need to watch the roof work.
What happens if the weather is bad on installation day?
Weather can delay roof work, and installers usually reschedule. Bord Gáis names weather as a factor in how long jobs take. In the Gulf, ask your installer what they do during dust storms and the hottest part of the day.
Will my solar panels work as soon as they're installed?
Not always. The crew can test the system on the day, but many utilities require an inspection or permission before the system can run normally. Ask for the expected switch-on date in writing.
Related reading
- How much does home solar cost in the UAE and Saudi Arabia?
- Net metering in the Gulf: how solar credits work
- How to choose a licensed solar installer
- How often should you clean solar panels in the Gulf?
- Do solar panels work in extreme heat?
Figures and processes in this guide are typical examples, not quotes or guarantees. Installation steps, timelines, and regulations vary by installer, roof, system size, and country, and they change. Get written quotes and an installation plan from licensed installers and confirm current rules with your local utility. Last updated: October 31, 2026.
Sources
- Bord Gáis Energy, "What to Expect on Solar Install Day in Ireland" (published May 20, 2026)
- Sunrun, "What Happens During a Solar Panel and Battery Installation Process" (updated March 4, 2026)
- Blue Raven Solar, solar panel installation expectations (undated)
- Installer help center, "Learn what to expect on your installation day" (undated)
- Daily Capital, solar installation timeline, Pakistan (undated)
- dubizzle, "All About Shams Dubai"
- dubizzle, "Solar Powered Home in Dubai With DEWA"
- DEWA, Shams Dubai FAQ on solar PV systems
- pv magazine, "Saudi Arabia issues net metering scheme for small-scale solar" (August 2017)
- SMM, "Saudi Arabia Proposes Self-Consumption Solar Framework with Net Billing Mechanism" (October 20, 2026)
- 8M Solar, "Solar Panel Efficiency vs. Temperature"
- SunSave, "Do solar panels fail in hot weather?"
- Shah et al., "The Influence of Cleaning Frequency of Photovoltaic Modules on Power Losses in the Desert Climate," Sustainability 12(22), 2020
- KFUPM, "Cost-effective cleaning optimization for enhanced solar PV power" (Sakaka plant, 2020 to 2024 data)