Solar for Perth Homes with Pool, AC and EV: 2026 Sizing Guide for High-Energy Households
TL;DR: A typical Perth home with pool, ducted AC, and one EV uses 40–55 kWh per day, and the right system is 13.2 kW solar + 13.5–20 kWh battery. Cost: $22,000–$26,500 after Federal and WA rebates. With smart load-scheduling (pool pump and EV charged during solar generation) annual electricity bill savings of $5,200–$6,400, paying the system back in 4.0–5.0 years.
The big three: what each appliance actually uses
Pool pump (and pool heat pump if fitted)
A standard variable-speed pool pump in Perth runs 6 hours daily and uses 6–10 kWh/day. If the pool has a heat pump (common in Perth for year-round swimming), add another 10–18 kWh/day in cooler months. Annual pool energy: 2,500–9,000 kWh.
Ducted reverse-cycle AC
Perth’s hot summers and increasingly common heating in winter mean ducted AC is a major load. A 14 kW system used 6 hours daily uses 14–20 kWh/day in summer peak and 4–8 kWh/day in shoulder seasons. Annual AC energy: 4,000–7,000 kWh.
EV (electric vehicle) charging
A typical Perth driver covering 40–60 km/day uses 8–12 kWh/day for EV charging. For two EVs or longer commutes, double this. Annual EV energy: 3,000–8,000 kWh per car.
Base household load
Standard household consumption — fridge, lighting, cooking, hot water, electronics — adds 10–14 kWh/day.
Total consumption profile (high-energy Perth household)
| Load | Summer kWh/day | Winter kWh/day |
|---|---|---|
| Pool pump | 8 | 6 |
| Pool heat pump (if fitted) | 0 | 15 |
| Ducted AC | 18 | 6 |
| EV charging (one car) | 10 | 10 |
| Base household | 12 | 12 |
| Total | 48 kWh/day | 49 kWh/day |
The pattern is unusual: a high-energy Perth home consumes roughly the same amount year-round. Summer AC use is offset by winter pool heating; EV use is constant. This makes solar sizing easier than for typical homes whose loads swing seasonally.
Sizing solar for this profile
To meet 48 kWh/day consumption with solar in Perth (5.6 peak sun hours), the required system size is roughly 48 ÷ 5.6 = 8.6 kW DC as a starting point. But this assumes 100% self-consumption, which isn’t realistic. To allow for daily winter shortfalls, generation losses, and some export buffer:
- Solar size: 13.2 kW (32 panels of 415W). Generates ~55 kWh/day summer, ~28 kWh/day winter average.
- Battery size: 13.5–20 kWh usable. Covers evening AC + EV charging gap.
- Inverter: 10 kW hybrid, three-phase preferred.
- EV charger: 7 kW or 11 kW depending on phase, scheduled to charge during solar generation hours.
Single-phase homes are limited to 5 kW export, but installing 13.2 kW of panels remains viable because most generation is self-consumed by AC + pool + EV during the day.
Total cost in Perth after rebates (2026)
- 13.2 kW solar: $10,200–$12,400 installed (after STC)
- 13.5 kWh Tesla Powerwall 3: $8,700–$10,400 (after Federal + WA rebates)
- 7 kW EV charger: $1,500–$2,200 installed (depending on phase)
- Switchboard upgrade (if needed): $800–$1,500
- Total turnkey: $22,000–$26,500
Annual savings and payback
Before solar, a high-energy Perth home using 48 kWh/day on Home Plan A1 spends approximately $5,800/year on electricity (excluding supply charge). With the system above:
- Daytime solar self-consumption: covers AC + pool pump + EV charging (if scheduled to midday). ~32 kWh/day at 30c = $9.60/day saved.
- Battery evening cover: 13.5 kWh discharge replaces peak grid imports. ~$4/day saved.
- Off-peak top-up: small overnight grid imports at 9.5c. ~$0.50/day cost.
- DEBS exports: minimal — system is well-matched to consumption. ~$0.20/day earned.
Net annual saving: $5,200–$6,400. Simple payback: 4.0–5.0 years on the full $22,000–$26,500 system. The pool pump + EV + AC make this one of the highest-ROI solar profiles in Perth.
Scheduling tips for high-energy Perth homes
- Pool pump 11am–5pm: matches solar generation peak.
- Pool heat pump 11am–3pm (winter): shortest, hottest solar window.
- EV charging set to “solar mode” via Tesla/Sungrow/Wallbox app: only draws when solar surplus exists.
- AC pre-cool 2pm–4pm: house thermal mass coasts through evening peak.
- Battery charging from solar in midday, discharge 3pm–9pm: handled automatically by the inverter on Smart Home Plan settings.
Frequently asked questions
What size solar do I need for a Perth home with pool, AC and EV?
A 13.2 kW solar system with 13.5–20 kWh battery is the standard for high-energy Perth homes using 40–55 kWh/day. Smaller systems leave significant grid import; larger systems hit export limits without enough self-consumption uplift to be worthwhile.
Can a Perth solar system run my pool, AC, and EV?
Yes, with correct sizing and scheduling. A 13.2 kW system with 13.5 kWh battery covers approximately 85% of typical pool+AC+EV consumption when loads are scheduled to midday solar generation. The remaining 15% is overnight off-peak grid import at 9.5c/kWh on Smart Home Plan.
What’s the payback period for a high-energy Perth home with solar?
4.0–5.0 years simple payback on a $22,000–$26,500 turnkey system, with annual bill savings of $5,200–$6,400. The high baseline consumption makes payback faster than typical homes despite the larger upfront cost.
Should I install solar and battery before or after getting an EV?
Before. Solar+battery installed in advance immediately turns EV charging into near-free fuel. Installing solar after the EV means paying full grid rates for the months in between. Talk Energy regularly sizes systems with “EV-ready” wiring even when the EV arrives 6–18 months later.
Do I need three-phase power for a pool + AC + EV solar setup?
Not strictly. Single-phase Perth homes can run 13.2 kW solar + 13.5 kWh battery + EV charger with proper export limiting. However, three-phase enables 11 kW EV charging (twice as fast) and 15 kW solar export, so it’s preferred for homes planning long-term high consumption.
Got a Perth home with pool, AC and EV planned? Talk Energy designs solar + battery + EV-ready setups around your full consumption profile, not just panel count. Get a free Perth quote or call (08) 9468 1212.
