Solar carports in Perth: generating electricity while parking your car

A solar carport is a structure that serves as both a parking shade cover and a solar panel mounting system. Instead of mounting panels on the house roof, the solar panels form the carport roof, providing shade for the vehicle while generating electricity.

Perth's intense summer sun makes covered parking genuinely desirable — a car left in full Perth sun can reach interior temperatures of 60–70°C. The carport serves a dual purpose that a rooftop system doesn't.

When a solar carport makes sense in Perth

Limited or unsuitable roof: Some Perth homes have flat roofs, roof configurations dominated by hips and gables, significant shading from trees, or north-facing roof space already at the 6.6kW limit. A carport can add significant system capacity independent of the house roof.

Planning to add an EV: A carport with solar panels can be optimised for EV charging. Park under the carport, plug in during the day, charge from panels directly overhead. A 6kW carport can generate enough electricity in Perth's summer to provide 60–80km of EV range per day from solar.

Large property with space for structure: Perth quarter-acre blocks often have side driveways or rear access that can accommodate a freestanding carport structure without affecting the existing home footprint.

Commercial property: Small businesses with large car parks sometimes install solar carports over staff or customer parking — providing both shade and significant generation capacity. This application differs from the residential focus of this guide.

Generation output from a solar carport

Generation depends on panel capacity, orientation, and Perth's solar resource.

Single car bay (3m × 5m approx):

• Roof area: approximately 12–15m²
• Solar capacity: approximately 2.0–2.5kW (6–8 standard panels)
• Annual generation: approximately 2,900–3,600kWh

Double car bay (6m × 5m approx):

• Roof area: approximately 25–30m²
• Solar capacity: approximately 4.0–5.0kW (12–16 standard panels)
• Annual generation: approximately 5,800–7,300kWh

Large carport/shed structure (12m × 6m):

• Solar capacity: 10–15kW or more
• Annual generation: 14,600–21,900kWh

Orientation and tilt considerations

A rooftop is constrained to the existing roof pitch and orientation. A carport is purpose-built, so you have design choices:

Orientation: North-facing is optimal for maximum annual generation in Perth. If your block orientation means the carport naturally faces north-east or north-west, generation loss is modest (5–15%).

Tilt: A carport roof pitched at 10–15° offers a good balance between drainage, aerodynamic loading, and solar generation. Steeper pitches (20–25°) generate slightly more in winter but require more structural engineering for wind loading.

Flat roof: Some carport designs use flat or near-flat roofing. Flat panels in Perth's climate can accumulate dust more quickly (rain doesn't wash them as effectively). Mounting at 5–10° minimum improves self-cleaning.

Cost of a solar carport in Perth

Solar carports cost more than rooftop systems because they combine structural engineering, concreting/footings, carport construction, and solar electrical work.

Approximate indicative cost ranges (2026, Perth market):

| Type | Structure cost | Solar addition | Total | |---|---|---|---| | Single bay, steel frame | $4,000–$7,000 | $3,000–$5,000 (3kW) | $7,000–$12,000 | | Double bay, steel frame | $6,000–$10,000 | $5,000–$8,000 (5kW) | $11,000–$18,000 | | Large shed/carport 12m+ | $15,000–$30,000+ | $8,000–$15,000 (10kW) | $23,000–$45,000+ |

These are indicative ranges only — carport builds vary significantly by site conditions, footing requirements, design specification, and trades availability. Get multiple quotes.

STC rebate: The solar component qualifies for Small-scale Technology Certificates (STCs), reducing the solar portion of the cost. Rebate magnitude similar to a standard rooftop system of the same capacity.

Building permit requirements

A solar carport is a structure — it requires building permit approval in WA:

Building permit: Required for any new carport structure over 10m² in WA. Submit to your local council or private building certifier. Plans must show structural adequacy (footing design, wind loading — especially important in Perth given Fremantle Doctor conditions).

Solar installation: As with any solar system, requires a CEC-accredited installer and Western Power connection approval (NCN).

Consideration: Some heritage areas, strata schemes, and council overlay areas have aesthetic controls that may require additional approvals or restrict carport design. Check before committing to a design.

Integration with EV charging

A solar carport purpose-built for EV charging can be designed as an integrated system:

Daytime charging from carport solar: If the EV is parked under the carport during work-from-home days or weekends, the carport panels can charge the car directly via a home EV charger (Level 2, 7.4kW). A 5kW carport generates roughly 25–35kWh/day in Perth summer — enough for 300–420km of EV range.

Smart EV charger + solar diverter: Devices like Zappi (Myenergi), Fronius Wattpilot, or Wallbox Quasar can throttle charging speed based on available solar generation, avoiding importing grid electricity while still charging continuously through the day.

EV charging without solar: Even without solar panels, a carport structure can provide EV charging infrastructure (charge cable, wiring to switchboard) with solar panels added later.

Compared to rooftop solar

| Factor | Rooftop solar | Solar carport | |---|---|---| | Upfront cost for same capacity | Lower | Higher (structure cost) | | Roof penetrations | Yes | No (freestanding) | | Property impact | Minimal visual | Adds structure | | EV synergy | Indirect | Direct (shade + charge) | | Orientation flexibility | Constrained by existing roof | High (design choice) | | Strata / heritage constraints | Easier to approve | Requires structure permit | | Generation efficiency | Slightly better (optimal roof pitch) | Comparable if well-designed |

A solar carport is a meaningful investment. Use the BillWise calculator to model the generation and savings for your specific property before engaging builders and solar installers.