Solar + Battery Savings in Parramatta, NSW 2150

What would solar panels and a home battery actually cost — and save — for a typical household in Parramatta (2150)? Here's the full worked example using 2026 NSW tariffs, the federal rebates, and a family-sized home using about 20 kWh a day.

The typical Parramatta bill

Canstar's May 2026 data shows the average NSW quarterly electricity bill at $497 — about $1,990 a year. Our example household is a step above average at ~20 kWh a day (~$2,800 a year before solar), which is common for a family home with air-con and evening cooking. On the 2026–27 NSW benchmark tariff of 34.0c/kWh with a typical flat feed-in tariff of 4c/kWh, that breaks down as:

• 7,300 kWh a year × 34.0c ≈ $2,482 in usage charges.
• ~88c a day supply charge ≈ $321 a year.
• Total: ~$2,803 a year before solar.

The recommended system: 6.6 kW solar + 10 kWh battery

For this usage profile, the sweet spot is a 6.6 kW solar system (about 15 modern 440W panels) paired with a 10 kWh home battery:

• A 6.6 kW system generates roughly 25.7 kWh a day (~9,400 kWh a year) in Parramatta's solar zone.
• That covers the household's annual usage, with surplus to store.
• The battery lifts self-consumption from ~35% (solar only) to ~65% — catching daytime surplus for the evening peak.

Cost after rebates

The solar STC rebate is baked into the $6,600 price: Parramatta sits in CER Zone 3, so a 6.6 kW system installed in 2026 earns 6.6 × 1.382 × 5 deeming years = 45 STCs, worth about $1,710 at $38/STC. The battery rebate is the federal Cheaper Home Batteries Program at ~$245/kWh for the first 14 kWh. (Note: the battery rebate steps down on 1 January 2027, so a 2026 install captures the higher rate.)

Estimated savings and payback

With the battery storing ~65% of solar output for evening use:

• Self-consumed solar: ~6,107 kWh a year × 34.0c avoided ≈ $2,076.
• Exported surplus: ~3,288 kWh a year × 4c feed-in ≈ $132.
• Total estimated annual saving: ~$2,208.

That takes the annual bill from ~$2,803 down to under $600 — and gives a simple payback of about 7 years on the $15,150 outlay. Solar alone (no battery) would pay back in around 5 years but leave most evening usage on the grid.

Eligibility checklist for Parramatta households

• CEC-approved battery installed by a Solar Accreditation Australia accredited installer.
• Battery between 5 and 100 kWh nominal; the federal rebate covers the first 50 kWh of usable capacity.
• Paired with new or existing rooftop solar; grid-connected systems must be VPP-capable (joining a VPP is optional).
• One rebate per electricity meter; no income test.

Last updated: September 2026.