Solar panels and batteries in the Southern Highlands

Solar works well up here over a year. The catch is timing. A Highlands house uses the most power on a cold June evening, and a solar system makes nothing on a June evening. Peak demand and peak production sit about six months apart, which is why we size on a full year of bills and on what you can use in daylight.

Cold itself is not the problem. Panels lose roughly 0.3% of output for every degree above 25°C, so a cold, clear day can be one of the best. What costs you in winter is daylight: shorter days, a low sun, and fog that can sit in the valleys until mid-morning. North-facing panels on a steeper pitch favour a low winter sun, where the roof gives you that choice.

Around Moss Vale, Berrima and Sutton Forest, a lot of what we quote is a property: sheds, a bore pump, a cool room, a workshop, sometimes a second dwelling. Two places with the same annual bill can need very different systems, because solar only meets loads that run while the sun is up. The timing of the big loads is the design question.

Bring interval data if you have a smart meter. Your retailer must provide it on request, and it shows when the lumps happen. Then tell us which buildings are on which meter. Power generated behind one meter only offsets use behind that meter, so a system on the house does nothing for a shed on its own supply.

On the escarpment around Robertson and Burrawang, people ask whether to leave the grid. If the property already has a connection, the answer is almost always no. An off-grid system has to carry your worst week alone, and a run of wet, foggy days is an ordinary part of the year there. That means far more panels, days of storage, and a generator.

Off-grid can win when the alternative is paying to bring a new line to a block a long way from the network. For everyone else, a hybrid system is usually what they actually want: grid-connected solar with a battery and chosen backup circuits. A standard system shuts down in an outage, so backup has to be specified, not assumed.

Wingecarribee's bush fire prone land map was updated and certified in July 2025, and it now includes unmanaged grassland and pasture as a mapped category. The council says being newly mapped does not stop development or require changes to existing buildings. If you are planning a ground-mounted array or a new shed to carry panels, check the property on the council's map before you design it.

Berrima and Bowral both have heritage conservation areas, and there are others in the shire. Rooftop solar on a heritage item or in a conservation area can need approval where an ordinary house would not. If that applies to you, tell us at the assessment and check with the council first, because it can change which roof face the panels go on.

Your distribution network approves every connection and decides how much you may export. On a flexible export connection, eligible customers can export up to 10kW per phase most of the time. On a long rural run to a shed or pump, cable size and voltage drop are settled and priced in the quote, not on the day.

Your network is phasing in the NSW Emergency Backstop Mechanism. New and upgraded systems up to 200kW are registered from 2 November 2026, capability tests at installation are phased in by postcode from 1 February 2027, and all new and upgraded systems must be backstop-enabled by 30 April 2027. They need CSIP-AUS compliant equipment, and a site without reliable internet is held to a static 1.5kW export limit until connected. Systems already installed are not affected.