Solar potential in Williamstown
Here's what panels on a Williamstown roof make, month by month, and what that could mean for your bill.
Updated November 2026 · Litmec Electrical, REC-10383
A 6.6 kW north-facing solar system in Williamstown makes about 9,500 kWh a year: around 35 kWh a day in midsummer and 15 kWh a day in June. East or west-facing roofs make about 85% of that.
On a $450 quarterly bill, that could save roughly $600–800 a year. Williamstown ranks 7th of the 38 Melbourne suburbs we've modelled for solar output, but the spread across Melbourne is only 3%: your roof's direction and shade matter far more than your postcode.
Solar output in Williamstown
- Output per kW, north
- 1,438 kWh/yr
- Output per kW, east / west
- 1,224 / 1,216
- Best month, per kW
- 5.3 kWh/day (Jan)
- Worst month, per kW
- 2.3 kWh/day (Jun)
- Council
- Hobsons Bay City Council
- Postcode
- 3016
- From Litmec, Newport
- about 2 km
- Site visit
- Free, no obligation
| System | North-facing, kWh/yr | East-facing, kWh/yr | West-facing, kWh/yr | June, kWh/day |
|---|---|---|---|---|
| 6.6 kW | 9,489 | 8,075 | 8,027 | 15.0 |
| 8 kW | 11,502 | 9,788 | 9,730 | 18.2 |
| 10 kW | 14,378 | 12,235 | 12,162 | 22.7 |
| 13.2 kW | 18,979 | 16,150 | 16,054 | 30.0 |
These figures use satellite and weather data for Williamstown from 2005 to 2023 and already allow for heat, wiring and inverter losses. They don't know your roof: shade, pitch and the faces available decide the real number, which is what the site visit checks. Try the roof calculator for your own direction and pitch.
Homes and roofs in Williamstown
Victorian and Edwardian cottages and villas, interwar homes and newer infill, with many streets under heritage overlays. Narrow cottage roofs, valley gutters and street-facing heritage roof planes are common, so panel layout is usually decided by the rear and side faces.
Heritage streets
Many Williamstown streets sit under heritage overlays administered by Hobsons Bay City Council. Panels on rear and side roof faces that can't be seen from the street are usually the simplest route, mounted flush with all-black panels. We check the overlay for your address before quoting. Solar on heritage homes.
Salt air near the bay
Parts of Williamstown are close to Port Phillip Bay. Near the water we specify panels certified for salt-mist exposure (IEC 61701) and corrosion-resistant mounting hardware, because standard fittings corrode faster in salt air.
Older switchboards
A lot of Williamstown housing pre-dates the 1980s, so ceramic fuses, missing safety switches and old fibrous switchboard backings are common. These have to be fixed before solar connects. We're electricians: we check the board on the visit and price any work in the quote. Check your switchboard.
What solar could save in Williamstown
For a home paying $450 a quarter with someone in some days, the calculator suggests a 6.6 kW system saving about $600–800 a year, or $1,000–1,400 with a 10 kWh battery. Your own bill gives a better answer: use the calculator below.
How it works with Litmec
Litmec Electrical is a registered electrical contractor based in Newport, about 2 km from Williamstown. We sell the system, design it from your bills, organise the paperwork and rebates, and stand behind the whole system with a 5-year warranty. Accredited installers we subcontract and supervise fit the panels, and our own electricians do any switchboard work. Not sure what size you need? Try the system finder.
Nearby suburbs
Check your bill: solar for your Williamstown home
A few quick questions, using Williamstown's solar output. See the system that fits and what it could save, then get a free design and quote.
Building a new home? Skip the bill and send us your plans
Solar in Williamstown: questions
How much power do solar panels make in Williamstown?
Each kW of north-facing panels in Williamstown makes about 1,438 kWh a year, so a 6.6 kW system makes about 9,500 kWh a year, or 26 kWh a day on average. East or west-facing panels make about 85% of that. (PVGIS satellite data.)
Is solar worth it in Williamstown?
For most owner-occupied homes with a typical bill, yes. On a $450 quarterly bill with someone home some days, a 6.6 kW system could save roughly $600 to $800 a year. Small bills and heavily shaded roofs save less; the site visit tells you honestly.
Do I need council approval for solar panels in Williamstown?
Many Williamstown properties are under heritage overlays with Hobsons Bay City Council, where panels visible from the street may need a planning permit. Panels on rear and side faces are usually simpler. We check your address before quoting.
Does Litmec do solar in Williamstown?
Yes. Williamstown is about 2 km from our base in Newport and well within our 100 km service area. Site visits are free, and your contract and 5-year whole-of-system warranty are with Litmec Electrical.
What size solar system suits a Williamstown home?
Size follows your power use. Most homes paying $350 to $600 a quarter suit 6.6 to 10 kW on single phase. Narrow cottage roofs, valley gutters and street-facing heritage roof planes are common, so panel layout is usually decided by the rear and side faces.
See what your Williamstown roof can do
Free site visit from a licensed electrician: roof, shading and switchboard checked, options walked through.