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Adding a Battery to Your Existing Solar System

Everything Perth homeowners need to know about retrofitting batteries to solar systems

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Why Add a Battery?

Increase Self-Consumption

Use 80-90% of your solar instead of exporting it for low feed-in rates

Blackout Protection

Keep essentials running during grid outages with backup power

VPP Earnings

Earn ~$100-180/year from Synergy Battery Rewards (10-13kWh)

Is Your Solar System Compatible?

Compatible Systems (Easy Integration)

• Hybrid inverters (already battery-ready)
• String inverters with DC coupling option
• Systems under 10 years old
• Single-phase or three-phase connections

May Need Additional Work

• Microinverter systems (require AC coupling)
• Systems over 10 years old (may need inverter upgrade)
• Limited switchboard space (may need expansion)
• Non-standard voltage systems

Integration Methods

DC Coupling

Battery connects to solar panels before inverter. Most efficient option (98% efficiency) but requires compatible hybrid inverter.

Best for: New systems or inverter upgrades

AC Coupling

Battery has its own inverter, connects to home circuit. Works with any existing solar system but slightly less efficient (94% efficiency).

Best for: Retrofitting existing systems

Right-Sizing Your Battery

Battery size should match your evening/night consumption and morning use before solar kicks in.

Small System

10-13 kWh

2-3 person household, 15-20 kWh/day usage

Medium System

13-20 kWh

3-4 person household, 25-35 kWh/day usage

Large System

20-30 kWh

5+ person household, 40+ kWh/day usage

Cost Expectations (Perth 2026)

Battery system (10-15 kWh)$12,000 - $18,000

Installation labor$2,000 - $3,500

Additional electrical work$500 - $2,000

Less: WA Battery Rebate-$3,600

Net cost after rebate$10,900 - $19,900

1,227

CEC-Approved Batteries Tracked

3.4K+

Perth Homeowners Helped

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