Address: 3/90 Discovery Drive, Bibra Lake, Western Australia, 6163.
3 kW solar is the new 4 kW solar. Why? 3.9 kW is the largest subsidy-claimable configuration for a 3 kW solar-only inverter in Australia. Meanwhile, it generates a similar energy yield to a 4:4 kW solar solution. Also ideal for a limited roof.
GENERATE
Power
A 3 kW solar system typically generates around 15 units8 per day . That’s the energy-saving potential. At Perth Solar Warehouse, you select your preferred combination of products for the 3 kW system, including panels, an inverter, and optional storage, tailored to your goals and budget. Solar array options start from $2,690*
*“From” pricing applies to eligible base installation criteria and selected products. Final pricing varies depending on the product combination, site conditions, and installation requirements. See “Pricing & installation conditions” and “Additional installation costs”.
Key factors in selecting panels are (1) budget, (2) warranty, (3) technology, and (4) available roof area. When you’re ready, we can recommend the best match for your property and consumption profile. Below are leading-brand residential-size panel options in high demand.
Popular Battery & Inverter Combinations for 3 kW Solar: All-in-one systems act as the control centre and communications hub of your home energy ecosystem. This integrated conversion and storage approach provides a minimalist, end-to-end electrification solution.
HUGE SAVINGS: Build selected packages in the latest catalogue ›
Committed to providing Perth's most valuable 3 kW solar system guarantee
We offer more than just the best 3 kW solar deals that customers in Perth are looking for. Like you, we are committed to supporting your transition to electrification. Every 3 kW solar energy system from Perth Solar Warehouse represents our dedication to energy savings and our community. With over twenty years of establishment in local business, we provide guarantees on our systems and workmanship, ensuring a reliable operational commitment that you can trust.
Our guarantee of the best value for a 3 kW solar energy system installation in Perth is backed by our extensive operational history and a proven, enduring warranty.
Your
NEXT
STEP
Make sure the above prices are our best:
- Receive a copy of the latest 3 kW solar catalogue when you submit for a quote.
- Choose your ideal 3 kW solar package.
- Reconnect for a hassle-free property compatibility check.
Perth Solar Warehouse caters to customers looking for a detailed 3 kW solar purchasing experience that fits both their time and budget. Think of us as Perth’s straightforward, direct-to-user choice when you know exactly what you need.
Very professional. I chose PSW because it was WA-based and offered competitive prices with excellent customer service. From start to finish, the process was easy, with very minimal hassle; all questions were answered in a timely manner. Installation went without a hitch and the guys did a good job tidying up after themselves. I would highly recommend PSW.
Amanda Veitch - Google ⭐⭐⭐⭐⭐
We are very pleased with our decision to get our solar system from PSW. The entire installation process was quick and painless, and it has been working perfectly all year. We run a ducted reverse cycle air conditioner, and I used to have a standing order with Synergy for $150 a month. This has been reduced to $20 a month, which covers our bills. So, approximately $1,560 per year in savings means the payback period for the system is less than 3 years for us. I would love to get a battery for the system when the prices come down in the future.
Trevor Smith - Google ⭐⭐⭐⭐⭐
A very easy and stress-free experience. Once I contacted PSW, the whole process ran smoothly. There was no pressure to sign up, all relevant information was sent to me, and I was left to make my decision. The date was booked in, and the system was installed without any issues. My roof faces east-west, but PSW was able to install the system to make full use of the conditions nonetheless. Started producing power immediately. Have already recommended PSW to friends and will continue to do so.
Craig Van Der Laan - Google ⭐⭐⭐⭐⭐
Google and SolarQuotes 4.9/5. PSW ranking ›
Why 3.9 kW solar on a 3 kW inverter?
Western Power may restrict inverter capacity in certain network locations to no more than 3 kW inverter output capacity.
Most leading inverter brands state that their inverters can endure solar array oversizing by up to 50%. The Clean Energy Regulator has had its say on this topic and capped the oversizing of solar inverters to 33% without a battery.
Therefore, 3 kW Inverter capacity (3) ÷ 0.75 = 3.99 kW of solar panels.
Increase savings potential and improve system efficiency by overdriving your inverter ›
How much will I save from 3.9 kW of solar panels?
This depends on you. A 3.9 kW solar energy system with a 3 kW inverter will calculate to generate an annual daily average of 15 units⁸ (kWh).
Maximum energy saving: The ability to shift appliance operation in line with solar production, consuming only the variable system energy yield. Considering a Northern roof aspect (0°) with a 25° roof pitch, located in Perth (6000) and environmentally derated to 70% generation at Standard Test Conditions, your energy savings on the Synergy Home Plan A1 tariff in 2025 at 30c per kWh would calculate to:
3.9 kW = $1640
Suppose you choose to opt out of a battery. In that case, these savings reflect unobstructed daylight hours within a variable solar bell curve period, 8 am to 5 pm, and are presented as unit-for-unit savings.
It’s important to note that every installation is unique and requires a location-specific energy yield report for informed decision-making. We’ve made getting your free yield report easy. Request a hassle-free quote, and we’ll send your complimentary energy yield report.
How much is the rebate for 3.9 kW of solar panels in Perth, Western Australia?
Perth and Bunbury [region] WA: $38 STC (Small Technology Certificate) value and a 440W solar panel size for multiplication:
System sizes | Installation year | Rebate value |
|---|---|---|
3.9 kW | 2026 | $1,248 |
3.9 kW | 2027 | $1,040 |
For your convenience, advertised 3 kW solar package prices by Perth Solar Warehouse include the zone 3 STC solar rebate deducted as a point of sale discount to be redeemed by Perth Solar Warehouse after installation, recovering the total system value.
Learn more about: Your solar rebate amount ›
How much is the Synergy solar feed-in tariff with 3.9 kW of solar panels?
Most residential 3.9 kW solar arrays installed on a 3 kW inverter will qualify for the Synergy solar feed-in tariff named; DEBS (Distributed Energy Buyback Scheme). This means you can receive:
2c ex GST: off-peak
10c ex GST: peak (3 pm to 9 pm)
2024/25 Synergy solar feed-in tariff update ›
As wholesale energy values vary at different times of the day, the Distributed Energy Buyback Scheme values your excess solar energy with the energy available in the grid at a nominated time. A two-cent valuation during higher ambient light periods reflects a surge of wasted solar power to the grid by a high-volume accumulated systems exporting simultaneously.
Solar energy is most valuable when used directly or stored in a battery for later use. If eligible, the Synergy Distributed Energy Buyback Scheme will only favour your energy bill in a reduced capacity.
Can I increase my solar array size beyond 3.9 kW on a 3 kW inverter if I add a battery?
Yes. However, this more likely depends on your available rooftop surface area and ideal product combination.
Different inverter/all-in-on battery specifications range in maximum inverter over-driving capabilities. To increase your energy yield from solar, seek out a quote by Perth Solar Warehouse to understand the maximum solar array/inverter/battery combination to suit you.
*Pricing & installation conditions:
1. Advertised prices and rebates. Displayed prices apply to the product shown on this page and are subject to eligibility for applicable rebates. Solar PV pricing assumes eligibility for Small-scale Technology Certificates (STCs). Battery pricing assumes eligibility for the WA Residential Battery Scheme (if applicable) and/or the federal Cheaper Home Batteries Program. Unless stated otherwise, prices are based on an Eligible Structure and Base Installation Criteria. Prices include GST and are shown with eligible rebates applied as point-of-sale discounts (where specified). Additional installation costs may apply; see “Additional installation costs”.
2. Eligible Structure. Displayed pricing assumes a simplified residential installation: single-storey, single-roof face for solar panel arrays (where applicable), and a non-detached dwelling with suitable access and existing switchboard capacity/provisions to accommodate required additional circuitry and/or metering.
3. Base Installation Criteria – Solar PV. Base-package solar PV pricing assumes the PV system is installed with a CEC-approved inverter (or an integrated storage system that includes an eligible inverter). Where stated as “post-STC,” the displayed price includes a point-of-sale discount based on the Zone 3 STC value. Additional installation costs may apply.
4. Base Installation Criteria – Inverter/Battery. Base-package pricing assumes the primary inverter and/or primary (AC-coupled) battery is installed within 15 metres of the main electrical switchboard. Expansion (DC-coupled) batteries must be vertically integrated with the primary unit or installed within 3 metres of the primary battery/inverter (as applicable). Additional installation costs may apply.
5. Small-scale Technology Certificates (STCs). Where STCs are included, the STC value is applied as a point-of-sale discount calculated at $38 per certificate from the GST-inclusive total. Displayed prices that reference STCs are shown after this STC discount.
6. WA Residential Battery Scheme (WA Battery Rebate). Where applicable, the WA rebate is applied as a point-of-sale discount, calculated at $130 per usable kWh, up to a maximum of 10 kWh of usable capacity. Participation requirements include joining an eligible Virtual Power Plant (VPP), such as Synergy or Plico (as applicable). Customers may choose to opt out of the WA Residential Battery Scheme (where permitted), in which case the battery price will increase by the amount of the rebate.
7. Cheaper Home Batteries Program (Federal Battery Rebate). Where included, the value of any national battery incentive is applied as a point-of-sale discount calculated at $38 per certificate (net of trading fees). Because eligibility and net value can vary, request a preliminary quote for the full GST-inclusive system cost and the itemised incentive value applied to your configuration.
8. Performance and generation estimates. Any generation figures shown are indicative only and do not represent guaranteed output. Site-specific modelling is recommended; contact Sales Support for an estimate based on your address and roof design.
9. Right to decline. Perth Solar Warehouse reserves the right to decline participation in tenders, quote requests, or enquiries at its discretion.
10. Additional installation costs: View ›
11. PSW Installation Region: Western Australia ›
