Top 10 Solar Panel Installers in Western Australia

Solar Choice's price index for 1 October 2026 puts the average Perth price at $5,030 for a 6 kW system and $5,470 for 7 kW, after the STC discount and including GST. That makes Perth the cheapest capital in the index. A 6.6 kW system usually falls between those figures, and premium systems averaged $6,150 to $6,770. Outside Perth, SolarQuotes listings in our Bunbury guide ranged from under $4,000 to over $11,000, and SolarQuotes reported an average of about $5,514 for 6.6 kW in Mandurah.

There is no WA rebate for solar panels alone as of October 2026. Federal STCs are the main discount. A 6.6 kW system in Perth, which is in zone 3, earns about 45 certificates in 2026, worth up to about $1,800, and about 36 in 2027. For batteries, the WA Residential Battery Scheme pays up to $1,300 for Synergy customers or $3,800 for Horizon Power customers, with the maximum for 5 to 10 kWh of usable capacity. It stacks with the federal Cheaper Home Batteries Program. Interest-free loans of up to $10,000 need household income under $210,000.

WA has no competitive feed-in tariff market. Synergy and Horizon Power pay under the Distributed Energy Buyback Scheme (DEBS). Synergy customers get 10c per kWh for exports between 3pm and 9pm and 2c at other times. Most Horizon Power customers get 10c and 3c. Retailers only have to pay for 50 kWh a day. From 1 May 2026, new or upgraded systems on the south west grid must be able to be remotely disconnected to take part in export products such as DEBS. If not, the system is set to a fixed 1.5 kW export limit.

Western Power's updated rules let new or upgraded systems on the south west grid use up to 30 kVA of inverter capacity on a standard connection, up from 5 kVA. The catch is exports. To join DEBS or another export product, the system must support remote disconnect and reconnect, which Synergy sets up using the CSIP-AUS standard. If you opt out, or your internet is unreliable, the system is set to a fixed 1.5 kW export limit. A bigger inverter does not mean bigger exports, so ask your installer which pathway the quote assumes.