10kW Solar System
A 10kW solar system is the step up from the standard 6.6kW system. It generates roughly 50 per cent more electricity, making it the right choice for larger households, homes with pools, households switching from gas to electric, and homeowners who are charging (or planning to charge) an electric vehicle.
This guide explains who a 10kW system suits, what it includes, how much electricity it generates, how it pairs with a battery, and whether you need three-phase power. If you are deciding between system sizes, the comparison at the end of this page will help you choose.
Who Is a 10kW System Designed For?
A 10kW system suits households that consistently use 25 to 40 kWh of electricity per day. That level of consumption is common in homes with some combination of the following:
- A pool.
A pool pump running 6 to 8 hours per day uses 5 to 10 kWh. Add pool heating (heat pump or solar-electric hybrid) and the draw increases further. A 6.6kW system struggles to cover pool loads on top of normal household use.
- Ducted or multi-zone air conditioning.
A ducted reverse-cycle system running through summer afternoons and evenings adds 8 to 15 kWh per day depending on the home's insulation and climate zone. Split systems running across multiple rooms create a similar load.
- A home office.
Working from home means daytime electricity consumption is higher than a household where everyone is away during the day. This actually benefits solar because more of the generation is consumed directly rather than exported.
- Gas-to-electric transition.
Replacing a gas cooktop, gas hot water, and gas heating with electric alternatives (induction, heat pump hot water, reverse-cycle heating) can add 10 to 15 kWh per day. A 10kW system is sized to absorb this increase.
- An electric vehicle.
Charging a standard EV driven 40 to 50 km per day adds approximately 8 to 10 kWh of daily consumption. A 10kW system generates enough surplus to cover daily EV charging for most commuters when combined with reasonable household use.
- A family of three to five.
Larger households simply consume more electricity through additional cooking, laundry, hot water, and device charging. If your household consistently uses more than 25 kWh per day, 6.6kW will leave you buying a significant portion of your electricity from the grid.
If none of the above apply and your daily usage is under 25 kWh, a 6.6kW system is likely the more cost-effective choice.
What Does a 10kW System Include?
A 10kW solar system consists of approximately 23 to 25 solar panels (using current N-type panels rated at 420 to 440 watts each) and a solar inverter rated at 8 to 10kW.
Roof space required. At approximately 1.8 to 2 square metres per panel, a 10kW system requires around 45 to 50 square metres of suitable roof area. This is roughly 50 per cent more than a 6.6kW system. Panels can be split across multiple roof sections if a single contiguous area is not available.
Inverter sizing. A 10kW panel array is typically paired with an 8kW or 10kW inverter. The inverter size depends on your electricity distributor's export approval and whether you have single-phase or three-phase power. On three-phase, a 10kW inverter is standard. On single-phase with export limiting, an 8kW or 10kW inverter may be approved with a 5kW export limit.
How Much Electricity Does a 10kW System Produce?
A 10kW solar system in Australia generates between 33 and 45 kWh per day on average, depending on your location, roof orientation, and the time of year.
- Typical annual generation.
A well-sited 10kW system in an Australian capital city generates approximately 13,000 to 16,000 kWh per year. In sunnier locations like Brisbane or Perth, output sits at the higher end. In Melbourne or Hobart, output sits at the lower end.
- Seasonal variation.
Like all solar systems, output is higher in summer and lower in winter. A system producing 45 kWh per day in January may produce 25 to 30 kWh per day in June. If your consumption is consistent year-round (pool, EV, heating), the winter dip means you will still draw some grid electricity during the shorter days.
- Self-consumption matters.
The more of your solar generation you use directly (rather than exporting), the greater your savings. Households with daytime loads (pool pumps, home offices, EV charging during daylight hours) achieve higher self-consumption rates and faster payback.
Three-Phase Power: Do You Need It?
This is the question most 10kW system pages fail to address clearly. The answer depends on your electricity distributor's rules and your current electrical connection.
- Why three-phase matters.
Most Australian electricity distributors limit single-phase solar exports to 5kW. A 10kW system with a 10kW inverter exceeds this limit. Three-phase connections can typically export up to 15kW (5kW per phase), which accommodates a 10kW inverter comfortably.
- If you already have three-phase.
No upgrade needed. Your installer will design the system for your three-phase connection, and the inverter will balance output across all three phases.
- If you have single-phase.
You have two options. Some distributors allow a larger inverter on single-phase with export limiting (the inverter is programmed to cap exports at 5kW, even though it can produce more). Alternatively, you can upgrade to three-phase, which involves your electricity distributor and an electrician. The three-phase upgrade is a separate cost and can take several weeks.
- How to check.
Your installer will verify your connection type during the site assessment. If you are unsure, check your switchboard or your electricity bill, which should indicate whether you have a single-phase or three-phase supply.
If the three-phase requirement is a barrier, a 6.6kW system with a 5kW inverter fits comfortably on single-phase. Alternatively, discuss export-limiting options with your installer.
Adding a Battery to a 10kW System
A 10kW system generates enough surplus solar to charge a substantial battery during daylight hours, even after covering daytime household loads. This makes the 10kW system a strong candidate for solar-plus-battery installations.
What battery size suits a 10kW system?
For most 10kW system households, a 14 to 20 kWh battery is the natural pairing. A 14kWh battery covers typical evening and overnight consumption for a household using 25 to 35 kWh per day. A 20kWh battery provides additional headroom for larger households, EV charging from stored solar, or homes seeking greater grid independence.
If your budget is limited, a 10kWh battery provides meaningful coverage and can often be expanded later with a modular system.
Inverter planning. If you are considering a battery now or within the next few years, install a hybrid inverter from the start. A hybrid inverter manages both solar panels and battery storage. Retrofitting a battery onto a system with a standard string inverter requires either replacing the inverter or adding an AC-coupled battery, both of which add cost.
The federal Cheaper Home Batteries Program provides around a 30% discount on eligible batteries from 5kWh to 100kWh.
EV Charging With a 10kW System
A 10kW system is the minimum system size that comfortably supports daily EV charging alongside normal household consumption. A typical Australian commute of 40 to 50 km per day requires approximately 8 to 10 kWh of charging. A 10kW system generating 33 to 45 kWh per day has enough surplus to cover this, provided some of the charging occurs during daylight hours.
- Daytime charging.
If your EV is parked at home during the day (or you have a home charger with a timer), you can charge directly from solar. This is the most cost-effective approach because you are using free solar electricity rather than grid power.
- Evening charging with a battery.
If your EV is away during the day, excess solar can be stored in a battery and used to charge the EV in the evening. This requires a larger battery (20kWh or more) to have enough stored energy for both household use and EV charging.
- Why 6.6kW is insufficient for EV owners.
A 6.6kW system generating 20 to 30 kWh per day has limited surplus after covering household loads. Adding 8 to 10 kWh of EV charging pushes the total consumption beyond what the system generates, meaning you are buying grid electricity to charge the car.
Choosing Between 6.6kW, 10kW, and 13kW
If you are weighing up system sizes, the comparison below shows how the three options differ across the factors that matter most. Find the column that best matches your household.
How the Three System Sizes Compare
| Factor | 6.6kW system | 10kW systemThis page | 13kW system |
|---|---|---|---|
| Household size | 2 to 4 people | 3 to 5 people | 4+ people or all-electric homes |
| Daily electricity usage | 15 to 25 kWh | 25 to 40 kWh | 35 to 55+ kWh |
| Typical quarterly bill | $400 to $700 | $650 to $1,100 | $900 to $1,500+ |
| Roof space required | ~30 to 32 m² (15 to 16 panels) | ~45 to 50 m² (23 to 25 panels) | ~58 to 65 m² (30 to 32 panels) |
| Annual generation | 8,000 to 10,500 kWh | 13,000 to 16,000 kWh | 17,000 to 21,000 kWh |
| Best battery pairing | 10 kWh | 14 to 20 kWh | 20 to 28+ kWh |
| EV charging suitability | Limited surplus for EV | Supports daily commute charging | Supports EV + high home usage |
| Electrical connection | Single-phase (5kW inverter) | Three-phase recommended | Three-phase required |
| Future expansion | Add battery; limited panel expansion | Add battery; some panel expansion | Add battery; near-maximum capacity |
| Best suited to | Moderate-use homes, couples, small families on single-phase | Larger families, pool owners, homes switching from gas to electric | High-use homes, EV owners, all-electric households seeking near self-sufficiency |
Scroll the table sideways to compare all three system sizes.
If your household sits in the 10kW column, this system size is designed for your consumption level. If you are between 6.6kW and 10kW, the 10kW system usually offers better long-term value because the incremental cost of the additional panels is modest compared to the extra generation over 25 years. If your consumption exceeds 40 kWh per day or you are building an all-electric home, consider the 13kW system.
Frequently Asked Questions
How many panels are in a 10kW solar system?
Using current N-type panels rated at 420 to 440 watts, a 10kW system typically includes 23 to 25 panels. The exact number depends on the wattage of the specific panel model. Higher-wattage panels reduce the panel count and the roof area required.
Do I need three-phase power for a 10kW system?
Three-phase is recommended but not always required. Some electricity distributors allow a 10kW system on single-phase with export limiting. Your installer will check your distributor's rules during the site assessment and advise on the best approach. If three-phase is needed, the upgrade can be coordinated alongside the solar installation.
How much electricity does a 10kW system produce per day?
Between 33 and 45 kWh per day on average, depending on your location, roof orientation, and the season. Annual generation for a well-sited system is approximately 13,000 to 16,000 kWh. Output is highest in summer and lowest in winter, with roughly 40 to 50 per cent seasonal variation.
Can a 10kW system power a pool pump and air conditioning?
Yes. A 10kW system generates enough electricity to cover a pool pump (5 to 10 kWh/day), split or ducted air conditioning (8 to 15 kWh/day), and general household loads simultaneously during daylight hours. A battery extends this coverage into the evening.
Should I get 10kW or 13kW?
If your daily usage is consistently under 40 kWh and you have a standard-sized pool and standard air conditioning, 10kW is likely sufficient. If your usage exceeds 40 kWh, you are building an all-electric home, or you want maximum EV charging from solar, 13kW provides more headroom. The comparison table above shows the full differences.
What size battery should I pair with a 10kW system?
A 14 to 20 kWh battery is the natural pairing for most 10kW system households. A 14kWh battery covers typical evening and overnight consumption. A 20kWh battery provides additional headroom for larger households or EV charging from stored solar.
Is a 10kW System Right for Your Home?
The best way to find out is a site-specific assessment based on your roof, your energy usage, and your future plans. Request a free, no-obligation quote and we will recommend the right system size, inverter, and battery configuration for your home.
