What a 10kW solar system costs in Western Australia
A 10kW system in Western Australia runs $7,800 to $12,800 after rebates for value-tier equipment, saving about $1,130–$1,690 a year for a household using 30 kWh a day.
What is different about Western Australia
At 30c a unit Western Australia sits 4th of 8 on retail price, with a feed-in tariff of 2c. It averages 5.5 peak sun hours a day.
The price, and the spread
$7,800 to $12,800 after rebates. The gap between those two numbers is $5,000 for the same equipment doing the same job on the same roof.
| Household uses | Their bill a quarter | System | After rebates | Saves a year | Pays for itself |
|---|---|---|---|---|---|
| 10 kWh | $373 | 5–6.6kW solar | $5,270 to $7,300 | $430–$640 | 10+ years |
| 15 kWh | $510 | 6.6kW solar | $6,050 to $8,050 | $590–$880 | 8–10+ years |
| 22 kWh | $701 | 10–13kW solar | $7,800 to $12,800 | $910–$1,360 | 7–10+ years |
| 30 kWh | $919 | 10–13kW solar | $7,800 to $12,800 | $1,130–$1,690 | 6–9 years |
Where a 10kW system sits against the other sizes, in Western Australia.
Is this the right size for you?
A 10kW array suits a household using about 30 kWh a day, which in Western Australia means a bill around $919 a quarter at 30c a unit. Using much less than that and you are paying for generation you will export at 2c, which is close to giving it away.
Using more, or planning an EV, and you should be looking at the row below. An EV alone adds about 4.8 to 9 kWh a day.
What moves the price
Legitimately: a switchboard upgrade, a meter change, a two-storey or tile roof, scaffolding, and travel outside a normal service area. Each should be a line item you can see. Not legitimately: a separate charge for system design, a monitoring subscription the inverter makes redundant, and an extended warranty duplicating the manufacturer's.
$2,000 difference.
That is the gap between two quotes for the same 6.6kW system in Western Australia, in the same week. Not build quality, not a better job. Overheads, how full the diary is that month, and what the person at your kitchen table thinks you will agree to. On solar with a battery the same gap is $7,900.
Closing that gap is what I do. I already know what installers in your area are quoting this month for this equipment, so I get you the bottom of that range for the same system other companies charge thousands more for. It costs you nothing. The installer pays me, and only if you go ahead, which is why there is no reason for me to push you at a bigger system than you need or at a dearer installer.
Get your own numbers, then get them priced properly
The table above is four example households. Two minutes of questions gets you your system size, what it should cost after rebates in Western Australia, and a ten-year projection built on your roof and your usage. Then I find the bottom of that price range for you.
Run my numbers, freeNo installer buys placement or ranking here, and nothing reaches an installer unless you ask.
Common questions
How much does a 10kW solar system cost in Western Australia?
$7,800 to $12,800 after rebates for value-tier equipment, saving about $1,130–$1,690 a year.
Is a 10kW system big enough?
It suits a household using around 30 kWh a day, about $919 a quarter in Western Australia. An EV or a pool pushes you larger.
How long does a 10kW system take to pay for itself in Western Australia?
About 6–9 years on these figures, though occupancy moves that more than anything else.