Solar panels in Wyong

As an estimate, a 6.6kW system starts from $7,410, a 10kW system starts from $10,300 and a 13.2kW system starts from $11,250 (with battery prices starting from $4,290), with the STC discount for postcode 2259 already taken off (incl. GST for metro areas; regional areas subject to freight and travel costs). Those are starting estimates for a straightforward install, not a fixed price. 2259 covers everything from new estates to properties at the end of a long driveway, so a switchboard upgrade or a long cable run are the two additions that most often appear — and both belong in the quote rather than on the day.

Wyong 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 — so if anyone describes it as a government payment you need to claim, be careful with the rest of what they tell you.

The most common reason on a long line has nothing to do with the panels. Australian supply is nominally 230 volts, and by default a grid-connected inverter starts trimming its output once the voltage it sees climbs past about 253 volts, then stops altogether if a ten-minute average sits above 258. That is the inverter obeying the standard it was certified to, not failing. If your production graph has a flat top or a dip in the middle of a clear day, voltage is the first thing to check — before anyone sells you more panels.

Distance and current. Voltage rises a little along every stretch of cable carrying power, and it rises again along your own run from the inverter to the switchboard. Out past Yarramalong, Dooralong and Jilliby you may be a long way down the line from the transformer. In the newer estates the cause is usually the opposite — a street where a great many systems export at the same moment on the same sunny afternoon. Either way the voltage at your meter at noon can sit meaningfully higher than it does at six in the morning.

No, and this is the part worth being blunt about. If the limit is the voltage at your connection, extra panels push against the same ceiling and you have bought capacity you cannot export. Three things actually help: a short, generously sized cable run with the inverter near the switchboard, which is a design decision made before install day; using more of the power in the house at midday instead of sending it out; and a battery, which absorbs the midday surplus rather than pushing it into a grid that is already high. We would rather tell you that than sell you the bigger system.

Get the number, not an opinion. Monitoring that logs voltage as well as production will show you whether the inverter is sitting near its limit in the middle of the day, and a few days of that turns an argument into a measurement. If the supply voltage at your address is consistently high, that is a matter for your distribution network, which can investigate and adjust the supply — it is not something a panel clean or a new inverter will solve. If the rise is happening in your own cable run, that is fixable on your side of the meter. We will test an existing system either way, including one we did not install.

Usually, and there are three routes: add panels to the existing inverter if it has headroom, add a second inverter alongside, or replace the inverter and keep the panels. Which one makes sense depends on what is already up there and on how much of the roof is left. Worth knowing before you ring anyone: an expansion is assessed as a new application under today's rules, not the ones your house was approved under, and mixing panel models on one string has consequences for both performance and warranty. Our Oran Park page works through all of this in detail.

The distribution network that owns the poles and wires in your street approves it — not your retailer — and we lodge the application for you. On a flexible export connection, a complying system up to 30kW is automatically approved to export up to 10kW per phase. On a fixed export connection, the approval is 3kW per system. If your home has no reliable internet, exports are limited to a static 1.5kW per system until a connection is available. Anything above 10kW per phase is assessed site by site.

If you are installing new solar or upgrading an existing system, yes. Your distribution network is phasing the NSW Emergency Backstop Mechanism in by postcode from 30 November 2026, with full implementation by 22 February 2027. It applies to new and upgrading systems up to 200kW, which must use equipment compliant with the CSIP-AUS standard, and the installer runs a short capability test at installation. Systems already on the roof are not affected.