Solar + battery package cost in Perth
Perth buyers usually face a combined decision: panels, battery, or both on the SWIS under Synergy (or Horizon outside the grid). This page walks a concrete package — about 6.6 kW of rooftop solar plus a 13.5 kWh battery — through federal battery support, WA state support, and panel STCs, using figures verified 12 July 2026.
Example package (planning figures)
| Component | Typical installed |
|---|---|
| 6.6 kW solar (planning) | $6,500 |
| 13.5 kWh battery (reference) | $14,000 |
| Combined before support | $20,500 |
Support stack (Synergy customer)
| Support line | Amount |
|---|---|
| Panel STCs (illustrative) | $1,332 |
| Federal battery rebate | $3,367 |
| WA Synergy scheme (capped) | $1,500 |
| Combined support | $6,199 |
| Illustrative net package | $14,301 |
Full WA rules and Horizon variant: WA battery rebate. Federal-only calculator: rebate calculator.
DEBS and SWIS context
Synergy’s DEBS export payments currently sit in about 2.5–10 c/kWh across time bands in our snapshot (verified 12 July 2026). Midday exports are weak relative to evening import rates, which is why a correctly sized battery shows up in Perth payback chats even when “solar alone” still looks fine for daytime load.
What moves Perth package quotes
- Tile versus metal roofs; two-storey access
- Single-phase versus three-phase and battery gateway choices
- Whether the battery is installed with new panels or retrofitted later
- Freight and installer utilisation in WA
- VPP offers that change cashflow but add contract terms
Sources
Frequently asked questions
Is this only for Synergy customers?
The worked stack uses Synergy’s WA scheme cap. Horizon Power customers should swap in the higher per-kWh rate and cap from the WA rebate page.
Can I claim panel STCs and the battery rebate together?
Yes when each technology meets its own rules. They are separate instruments — keep them as separate lines on the quote.
How does DEBS change the package case?
Low midday export credits under DEBS make self-consumption more valuable. The battery’s job is evening import displacement, not maximising export credits.