Many Perth homeowners assume that getting solar panels fitted is as straightforward as booking a tradesperson and watching them work. In reality, a properly managed solar panel installation involves several distinct stages — each one building on the last — and knowing what happens at each step puts you in a much stronger position as a homeowner.
The Initial Site Assessment
Every installation starts with a site visit, and this stage is more involved than many people expect. An assessor will look at your roof’s orientation, pitch, and condition, check for any shading from trees, neighbouring structures, or rooftop fixtures, and evaluate where your switchboard and meter are located. These details directly affect how the system will be designed and whether any preparatory work is needed before panels go up.
In Perth, the prevailing advice is that north-facing roof sections produce the most consistent output across the year, given the angle of the sun in Western Australia. West-facing panels can also work well if your household uses more power in the afternoon and evening. A good assessor will note your roof type too — whether it’s colorbond, terracotta tile, concrete tile, or something less common — because this influences the mounting approach and installation time.
You’ll typically be asked about your power bills and usage patterns during this visit. That information helps size the system appropriately for your actual consumption rather than just fitting the largest system that will physically fit on your roof.
System Design and Equipment Selection
Once the site data has been gathered, the installer designs a system tailored to your property. This involves deciding on the number of panels, their placement across available roof sections, the capacity of the inverter, and whether a battery is being included. String inverters, microinverters, and optimisers each suit different roof configurations and shading situations, and the design should reflect your specific setup rather than a one-size-fits-all template.
The equipment used must meet Australian standards and, in Western Australia, comply with requirements set by Western Power for grid-connected systems. Panels and inverters must appear on approved product lists before they can be installed under the federal government’s rebate scheme. Your installer should be able to explain why particular equipment is being recommended for your roof and usage profile.
Approvals and Grid Connection Applications
Before any physical work begins, paperwork needs to be lodged. In Perth, connecting a solar system to the grid requires an application to Western Power through your energy retailer. This is not a formality — Western Power reviews the application to confirm the local network can accommodate the additional generation. In some suburbs, network constraints mean there are limits on how much power a system can export, which can affect the system size or export settings.
Your installer is responsible for preparing and submitting this application on your behalf. Approval timeframes vary, but it’s reasonable to expect a few weeks between application and receiving confirmation to proceed. Some areas or system sizes may also require additional sign-off from a licensed electrical contractor or an energy safety inspection, and your installer should handle these requirements as part of the project.
Installation Day: What Actually Happens
When approvals are in place, the installation crew arrives and work typically takes one day for a standard residential system, though larger or more complex setups may take longer. The crew will mount the racking system to the roof, secure the panels onto the racking, run the DC cabling from the panels down to the inverter location (usually in or near the garage, laundry, or on an exterior wall), and wire the inverter into the switchboard.
Perth’s climate means most installation work is done in direct sun, so crews will generally start early. You should expect some noise, temporary access restrictions around parts of your home, and a brief power outage when the switchboard work is completed. At the end of the day, the system is physically complete, but it may not yet be switched on — the grid connection step comes next.
Metering, Inspection, and Switch-On
After installation, a few things need to happen before the system can export power and start generating credits on your bill. Your retailer arranges for a new or reprogrammed smart meter that can record both power imported from the grid and power exported to it. This is essential for the feed-in tariff to work correctly. In some cases, the meter upgrade happens within a few days; in others, it can take several weeks depending on your retailer and network.
Depending on the system size and your state, an independent electrical inspection may also be required. In Western Australia, systems above a certain capacity require sign-off from Western Power before they can be energised for export. Your installer should walk you through the sequence of these steps so you’re not left wondering why the system hasn’t been switched on yet after installation day.
Once the meter is in place and all approvals confirmed, your installer will commission the system. This involves switching it on, checking that the inverter is communicating correctly, and confirming that generation data is being recorded. You’ll usually be shown how to read the inverter display or monitoring app so you can track the system’s output going forward.
Making Sense of the Full Picture
The process from first assessment to a live, generating system involves more steps than most people anticipate — but each stage exists for a reason. The site visit ensures the design suits your actual roof and usage. The grid application protects the local network. The metering and inspection requirements protect you as a consumer and ensure the system is safe and correctly recorded. Understanding the sequence means you won’t be caught off guard by wait times or paperwork requests along the way.
It also means you’re better placed to ask informed questions at each stage. If something in the process isn’t being explained clearly, or if steps seem to be skipped, those are worth raising. A well-run installation follows this sequence methodically and keeps you informed throughout.
There’s a lot more to consider before you even get to the assessment stage — particularly around who you choose to carry out the work. We’ll be covering what to look for when evaluating and comparing solar installers in Perth in an upcoming guide, which will walk through the credentials, questions, and red flags worth knowing about before you commit.