Electricity prices in Perth continue to climb year after year, leaving homeowners looking for ways to cut costs and gain independence from the grid. With Perth’s abundant sunshine, installing a solar energy system is one of the smartest investments you can make.

But here’s the big question many homeowners face:

Should you buy solar panels first, or add a solar battery right away?

Both have incredible benefits, and the answer depends on your budget, lifestyle, and energy goals.

In this guide, we’ll break down the pros and cons of each, explore real-world examples for Perth households, and help you decide which option gives you the best return on investment (ROI).

Why This Decision Matters in Perth

Before diving into comparisons, let’s look at why this decision is especially important for Perth homeowners:

  • High electricity rates: Synergy tariffs in WA have risen steadily, and more increases are expected in 2025 and beyond.

  • Abundant sunshine: Perth averages 5.5 – 6 peak sun hours per day, making it one of the best cities in Australia for solar.

  • Federal battery rebate: The 2025 Federal Solar Battery Rebate now offers up to $330 per kWh, making batteries more affordable than ever.

  • Blackout protection: Batteries can keep your home running during power outages, which are becoming more frequent in certain areas.

The combination of high sun exposure, government incentives, and rising power costs makes solar panels + battery storage an unbeatable energy solution — but which to buy first?

Option 1: Start with Solar Panels First

For most Perth homeowners, installing solar panels first is the smartest move.

Benefits of starting with solar panels:

Immediate savings on your power bill

  • A 6.6kW system in Perth can generate 26 – 28 kWh per day, easily covering the daytime energy needs of a medium-sized household.
  • Any excess power you don’t use is exported to the grid, earning credits through Synergy’s feed-in tariff.

Lower upfront cost

  • Solar panels alone are far cheaper than a full solar + battery setup.
  • With STC federal rebates, you can save thousands upfront.

Easy to upgrade later

  • If you design your system correctly, you can add a battery in the future without major changes to your solar setup.
  • This staged approach makes it easier on your budget.

Faster payback period

  • Solar panels in Perth usually pay for themselves in 3–4 years thanks to high sunlight and energy savings.

Example: Solar Only Savings

Scenario:

  • Household usage: 20 kWh/day

  • 6.6kW solar system generates: 27 kWh/day

  • Daytime self-consumption: 14 kWh

  • Exported to grid: 13 kWh

Savings:

  • 14 kWh x $0.31 (daytime rate) = $4.34/day saved

  • 13 kWh x $0.07 (feed-in tariff) = $0.91/day credit

Total daily benefit: $5.25/day or ~$1,900/year

Option 2: Install Solar Panels + Battery Together

Adding a battery at the same time as your solar panels gives you maximum independence, but it comes with a higher initial investment.

Benefits of adding a battery upfront:

Use your solar power day and night

  • Without a battery, excess solar power is sent to the grid for a small feed-in tariff.
  • With a battery, you store that energy and use it at night instead of paying peak rates.

Protection from blackouts

  • Certain solar batteries can keep your essential appliances running during power outages — ideal for families with medical equipment or home offices.

Lock in maximum government rebates

  • The Federal Solar Battery Rebate offers up to $330 per kWh, capped at 50 kWh.
  • A 10 kWh battery = $3,300 rebate
  • A 15 kWh battery = $4,950 rebate

Future-proof your energy needs

  • If you plan to buy an electric vehicle (EV) or add more appliances, having a battery now will save you from expensive upgrades later.

Example: Solar + Battery Savings

Scenario:

  • Household usage: 20 kWh/day

  • 6.6kW solar system generates: 27 kWh/day

  • Battery size: 10 kWh

How energy is used:

  • Daytime usage covered directly by solar: 14 kWh

  • Remaining 13 kWh goes into the battery

  • Nighttime usage covered by battery: 10 kWh

  • Minimal export to the grid

Result:

  • Electricity bill drops to near $0.

  • No dependence on Synergy for peak-time power.

Cost Comparison: Solar Only vs. Solar + Battery

System Type Typical Cost (After Rebates) Payback Period Energy Independence
Solar Panels Only (6.6kW) $3,500 – $4,500 3 – 4 years 30 – 40%
Solar + 10kWh Battery $10,000 – $12,000 6 – 8 years 80 – 90%
Solar + 15kWh Battery $12,500 – $14,500 7 – 9 years 90 – 95%


Note: Costs vary depending on the quality of panels, battery brand, and installation complexity.


Which Should You Buy First?

Go Solar First If:

  • You want immediate bill savings with a smaller upfront investment.

  • Your budget is limited right now.

  • You don’t have high nighttime electricity usage yet.

  • You plan to add a battery later.

Go Solar + Battery Now If:

  • You want maximum energy independence right away.

  • You have high evening usage or work from home at night.

  • You want to take advantage of the federal battery rebate before it runs out.

  • You live in an area prone to blackouts or power instability.

  • You plan to buy an EV in the next year or two.

Pro Tip: Design a Battery-Ready Solar System

Even if you choose to start with solar panels only, make sure your system is battery-ready. This means:

  • Installing a hybrid inverter that supports future battery connections.

  • Choosing a system size large enough to charge a battery later.

  • Working with a CEC-approved installer like Empower Solar Australia to ensure future upgrades are seamless.

Perth-Specific Recommendation for 2025

For most Perth homeowners in 2025:

  • Start with solar panels if your goal is to quickly reduce bills and get a fast ROI.

  • If you have the budget, add a 10–13.5 kWh battery now to take full advantage of the federal rebate and achieve near-total energy independence.

Remember, the federal battery rebate is limited, and demand is high, so acting quickly ensures you secure maximum savings.


Work With a Trusted Solar Installer in Perth

When it comes to installing solar panels and batteries, choosing the right installer makes all the difference.

Empower Solar Australia is a CEC-approved leading solar installer in Perth, offering:

  • Tailored system designs for your household needs.

  • Premium products, including AlphaESS, Tesla Powerwall, and other top brands.

  • Expert guidance on rebates and financing options.

  • Professional installation backed by local support and maintenance.

With Empower Solar Australia, you’ll enjoy a seamless experience from consultation to installation — and peace of mind knowing your system is built to last.