Solar panels across South West Sydney

Western Sydney gets far more very hot days than the coast, and on most bills here ducted cooling is the biggest single load. It runs through the middle of the day, when panels generate, so a larger system gets used at home rather than exported. A 6.6kW system covers part of a hot afternoon with the house full. If summer bills are what you want to fix, 10kW or more is the usual starting point.

Heat also costs output. Panels are rated at a 25°C cell temperature, and a typical modern panel loses roughly 0.3% of its output for each degree above it, so a dark roof in February runs well below the label. It is not a reason to skip solar, because hot clear days are still the best generating days. It is a reason to care about the ventilation gap and the temperature coefficient.

Prairiewood and Bossley Park are mostly established single-storey brick homes with concrete or terracotta tiles. Access is usually simple, and the common addition to a quote is a switchboard upgrade. Tiles should be lifted and flashed rather than drilled through. Around Liverpool, rooftop solar has been going up for longer than in most of the region, so many roofs already carry an older system.

The estates around Carnes Hill, Middleton Grange and Hoxton Park are newer, often three-phase, with modern switchboards. The constraint there is roof space: a narrow block with a garage, a skillion and a few vents leaves less unbroken north-facing area than the plan suggests. We measure the roof face by face before quoting a size.

Multi-generational homes run loads all day, which suits solar because more generation is used on site. A granny flat changes the design. If it runs off the main switchboard on one meter, one system can supply both. If it has its own meter and retail account, it is a separate customer to the network, and solar on the main roof cannot legally supply it. Check the meter box before anything is designed.

Plenty of homes here are rented. The owner pays for the system and applies for the connection, while the tenant holds the retail account and gets the lower bill. That split is worth putting in writing before a quote is accepted. A tenant needs the owner's written consent for any installation.

Every suburb page in this region sits on the same distribution network. On a flexible export connection, eligible customers can export up to 10kW per phase most of the time, with the inverter easing back when the local network needs it. Choosing a fixed limit instead caps exports at 1.5kW. Three-phase estate homes get the flexible allowance on each phase.

From November 2026 flexible exports become the default for eligible new and upgraded systems, which needs an active internet connection and an approved inverter. The NSW Emergency Backstop Mechanism is phased in by postcode from late 2026, and all new and upgrading systems up to 200kW must be backstop-enabled by 30 April 2027. Existing systems are not affected.

If the company that installed your system has closed, you have not lost everything. Panel and inverter product warranties and the panel performance warranty sit with the manufacturer or its Australian importer, and you can claim them yourself with the invoice and the model numbers. The workmanship warranty went with the business. Any currently accredited installer can test, repair and recommission a compliant system.

Inverters stop outright while panels degrade slowly, so repair is often the honest answer. Replacing the whole system makes more sense when the array was small to begin with, or the roof needs work anyway. Replacing an inverter or adding panels is an alteration to the connection and is assessed under today's rules.

An electric storage hot water tank is a battery many homes here already own. If it heats overnight on a controlled off-peak circuit, that heat is bought power. Moving it into the middle of the day is usually a timer and a conversation with your retailer, not new plumbing, and it is one of the cheapest savings available.

Your system generates from switch-on, but exports are only credited once the retailer has replaced or reconfigured the meter. Where you cannot agree a date, the replacement is required within 20 business days. Check the first bill for a solar export line, and check whether the tariff changed. A smart meter installed from 1 December 2025 cannot have its tariff structure changed without your consent for two years.