What happens on solar installation day in Perth

Installation day for a standard residential solar system in Perth takes about 6 to 10 hours, usually with a crew of 2 to 3 people on site. In that time they'll assess your roof, mount and wire the panels, run the electrical work, and test the whole system before handing it over. By the time they leave, you should have a working system, a walkthrough of the monitoring app, and a set of documents confirming the job meets WA electrical standards.

Two things do not happen on installation day itself: Western Power's network approval and your smart meter changeover. Both come later, and both are covered below so you know what to expect and when.

Installation day at a glance:

1. Site assessment and setup, 1–2 hours
2. Roof work, 2–4 hours
3. Electrical work, 2–3 hours
4. Commissioning and testing, 1–2 hours
5. Handover documentation, before the crew leaves

If you want to see how installation day fits into the bigger picture, our guide to the full solar installation timeline in Perth covers everything from your first quote through to first generation.

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What should you do before the crew arrives?

• Confirm the appointment 24 hours ahead. Installers reschedule fairly often, especially in busy seasons.
• Make sure the roof is clearly accessible from the most practical side of the house.
• Clear the area around your electrical switchboard of any stored items.
• Decide where you want the inverter mounted, if that wasn't already set in the quote. The garage wall or the house wall near the switchboard are the usual spots.
• Have someone home for the full day. The crew will need meter access and may have questions as they go.

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What happens during site assessment and setup?

Typical time: 1–2 hours.

The crew begins with a walk-through to confirm:

• Roof access routes and panel layout
• Inverter mounting location
• The cable run from roof to inverter to switchboard
• Switchboard condition against the quote specification (if a switchboard upgrade was quoted, this is when it gets checked in person)

What changes on the day: it's fairly common for the crew to spot a minor variation once they're actually on site: a different cable run to dodge a concrete soffit, a panel shifted to avoid a shade obstacle, or a switchboard upgrade that wasn't in the original scope. Any of these should be discussed with you before work proceeds, and any cost variation agreed in writing.

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What happens during the roof work?

Typical time: 2–4 hours, depending on roof complexity. For a 6.6kW system (typically 15 to 16 panels), expect the longer end of that range on a more complex roof.

What they install:

• Aluminium mounting rails, attached to roof trusses through the roof cladding
• Flashing and weatherproof seals at each penetration
• Solar panels, clipped onto the rails
• DC cable runs from the panels down to the inverter location
• A DC isolator (a safety disconnect switch) near the panels

For background on why that last item gets its own safety attention, see our guide to DC isolator fire risk in Perth solar systems.

What you might notice:

• Drilling and hammering on the roof. This is normal.
• Workers moving across the roof in harnesses on steeper roofs.
• Temporary cable visible down the side of the house.

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What happens during the electrical work?

Typical time: 2–3 hours, running alongside the roof work.

While the roof work continues, the electrician handles:

• Mounting and wiring the inverter to the wall
• Running AC cables from the inverter to the switchboard
• Installing the generation meter (which measures solar output)
• Switchboard modifications: adding RCDs or MCBs if required, wiring the solar circuit, and installing the main solar AC isolator
• Mounting and wiring the battery unit, if one is included. If you haven't settled on where that unit should go, our home battery location guide for Perth covers the options.

Switchboard work requires the mains power to be off. Expect to lose grid power for 30 to 60 minutes during this part of the job. Let anyone in the household know so they can save open documents.

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What happens during commissioning and testing?

Typical time: 1–2 hours.

The electrician and installer power up the system and confirm:

• The inverter is communicating with the panels and showing positive output
• The generation meter is registering correctly
• No error codes are showing on the inverter
• The AC isolator switches work correctly
• The monitoring app is set up and showing live data

You should be present for this part. The installer will show you the monitoring app on your phone, walk you through the inverter's display, confirm what export limit has been set in the inverter firmware, and show you how to read the generation display.

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What documents should you receive before the crew leaves?

Essential documents:

• Certificate of Compliance (electrical): a legal document confirming the installation meets current WA wiring standards. Keep it permanently.
• System performance sheet: shows panel brand and model, inverter model, and expected annual generation.
• Western Power connection application acknowledgement: confirmation the application has been submitted. You don't get network approval on the day itself. Most applications, around 85%, are approved within 24 hours; the rest can take up to 15 business days if Western Power needs to review them further.
• Inverter warranty card or registration instructions.
• Monitoring app login details.

Ask for these if they're not offered:

• The DC isolator's brand and model, and confirmation it isn't one of the models the Clean Energy Council has flagged on its product recall list.
• A roof penetration location diagram, useful for any future roofing work.
• Any photos taken during the installation.

For a fuller walkthrough of each document and why it matters, see solar installation paperwork in Perth.

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What happens after installation day?

Network approval and the smart meter: once Western Power approves the connection application (timing above), it arranges for your accumulation meter to be replaced with a smart meter. There's no fixed turnaround for that changeover. If you want a current estimate, ask Western Power directly.

DEBS activation: DEBS export credits won't show on your Synergy bill until the smart meter is installed and Synergy has activated the solar export tariff on your account. Contact Synergy after the meter is installed to confirm activation. If DEBS is new to you, DEBS explained: how Perth's solar feed-in tariff actually works covers the basics.

Your first bill: your first electricity bill after installation likely won't show DEBS credits yet. The second or third bill is usually where DEBS credits start appearing, once the meter and tariff are both in place.

Monitoring from day one: your inverter's monitoring app works immediately. You can watch live generation from installation day, independent of Synergy's metering.

For everything else to check in the weeks that follow, see our 30-day post-installation checklist.

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Installation timelines vary with system size, roof complexity, and crew size. Document requirements apply to Western Australian electrical work under WA electrical safety regulations.