Solar panels in Rouse Hill

As an estimate, a 6.6kW system comes to about $3,990, a 10kW to about $5,490 and a 13.2kW to about $7,990, with the STC discount for postcode 2155 already taken off. Those are typical figures for a straightforward install, not a fixed price. Note what the gap between the first two means: the extra 3.4kW costs about $1,500, because the labour, the scaffold and the paperwork are already paid for in the first number.

Rouse Hill is in STC Zone 3, rating 1.382. In 2026 a 6.6kW system creates 45 certificates, worth roughly $1,710 off the price, and a 10kW system 69 certificates, roughly $2,622. It is a discount applied at the point of sale, not a grant you apply for afterwards. Batteries have their own separate federal incentive, which is described further down this page.

Panels first, in most cases, and it is not close on the first stretch of money. Going from 6.6kW to 10kW adds about 3.4kW for roughly $1,500, because everything except the panels is already paid for. At 4.1 kWh per kW per day that extra capacity makes about 5,088 kWh a year — worth around $254 if every unit is exported at 5c, and nearer $708 if about a third of it gets used in the house. There is no cheaper kilowatt-hour available to you than the one that comes from panels you add while the installer is already on the roof.

No — it is a second step rather than a first one, and the numbers are better than they were. A battery earns on the gap between what you would have paid and what you were being given: on our NSW modelling figures that is 32c minus 5c, so 27c for every kilowatt-hour it stores and you later use. Take the 15kWh Sungrow option from our own price list at $6,565 after rebates: cycled completely every day of the year it would return about $1,478, and allowing honestly for winter, cloudy weeks and days nobody is home, something closer to $1,035. That is a real return. It is just a slower one than filling the roof.

Three situations, and they are worth checking before you assume panels. If your roof is genuinely full, more panels is not an option and the battery is the only remaining move. If your connection has a low fixed export limit, extra generation you cannot export is worth much less, which pushes storage up the list. And if backup through an outage is part of why you want this at all, that is not a financial calculation — a battery is the only thing that provides it, and no quantity of panels will.

Look at your own data rather than a brochure. Six months of monitoring on an existing system tells you how much you export on a typical day, and that surplus — not your total usage, and not the size of the battery someone wants to sell you — is the number a battery can work with. Buying storage larger than your daily surplus means paying for capacity that sits empty. This is the main reason we suggest panels first even when someone has the budget for both: it generates the information that sizes the battery properly.

No. They are modelling, built from the same figures our calculators use — 4.1 kWh per kW per day, 32c import and 5c feed-in for NSW — so that nothing on this page can drift away from the rest of the site. Your tariffs are on your bill and will not be exactly these. Your generation depends on your roof. What does not change with any of that is the shape of the comparison: panels are cheap per kilowatt-hour and dumb about timing, a battery is expensive per kilowatt-hour and good at timing.

The distribution network that owns the poles and wires in your street approves it — not your retailer — and we lodge the application for you. That network also decides how much your system may export: on a flexible export connection, eligible customers can send up to 10kW per phase back to the grid most of the time, while a fixed export limit caps exports at 1.5kW. Rouse Hill straddles two council areas, but that has no bearing on the connection — the network boundary is the one that matters, and it is the same across the 2155 postcode.