Solar and Batteries in NSW: How Rooftop PV Helps You Pass BASIX and Whole-of-Home

Rooftop solar has gone from a nice extra to one of the most practical ways to pass the energy side of BASIX. Since NCC 2022 added the Whole-of-Home assessment, the fixed appliances in your home, including any solar system, are scored against an annual energy budget. A well-sized array can offset other choices and make compliance far easier. Here is how it works.

Why solar helps your BASIX score

BASIX energy and the Whole-of-Home assessment reward homes that need less energy from the grid. Rooftop photovoltaic (PV) panels generate electricity on site, which lowers the home’s net energy use in the calculation. In many designs, adding solar is the cheapest single move to bring a borderline project over the line.

How Whole-of-Home counts solar

Whole-of-Home looks at heating and cooling, hot water, lighting and any on-site generation. Solar is credited based on system size, orientation and your climate zone. A north-facing array in a sunny part of NSW earns more than the same panels facing south or sitting in shade.

What about batteries?

Battery storage lets you use more of your own solar rather than exporting it, and it can contribute to your energy result. Batteries are a larger upfront cost, so they are usually a comfort and resilience choice as much as a compliance one. Your assessor can model the home with and without a battery so you can see the difference before you commit.

Sizing and orientation

• Roof space and orientation – a north-facing pitched roof is ideal, and east or west still work well.
• Shading – trees, neighbouring buildings and even chimneys reduce output, so panel placement matters.
• Future needs – an electric vehicle or a future pool changes your energy picture, so size with that in mind.

Pairing solar with efficient appliances

Solar works best alongside a heat pump or solar hot water system and reverse-cycle air conditioning. Together they keep your Whole-of-Home result comfortably under budget.

Frequently asked questions

Is solar mandatory under BASIX? Not strictly, but on many new homes it is the easiest and cheapest way to meet the energy and Whole-of-Home targets.

How big a system do I need? It depends on the home, its appliances and your climate zone. Your assessor models it, so there is no one-size-fits-all number.

Do batteries count? They can support your result and increase self-consumption, but they are usually chosen for resilience and running costs rather than compliance alone.

Planning a new home or major renovation in NSW? Get a fast, fixed-fee quote and we will model the right solar setup for your BASIX targets.