Updated November 2026·Independently researched·11 min read
Commercial solar in Darwin runs $22,000–$33,000
for a 30 kW system installed, after STCs, GST included - other sizes and site works below
Darwin businesses pay $22,000–$33,000 for a 30 kW commercial solar system installed after STCs, with $27,000 typical. A Winnellie wholesaler going to 100 kW is looking at $70,000–$110,000; a Mitchell Street bar at 10 kW is looking at $8,000–$12,000.
-1.5%Commercial Solar costs in Darwin are down around 1.5% over the past year, re-verified against 90+ sources in November 2026.Year on year
Typical 30 kW commercial system in Darwin
$27,000
30 kW installed after STCs, Darwin 2026, GST included
30 kW commercial system
$22,000-$33,000
50 kW commercial system
$35,000-$55,000
100 kW commercial system
$70,000-$110,000
$22,000$27,000$33,000
Darwin commercial solar is quoted by the kilowatt: $8,000–$12,000 for a 10 kW system on a small shop or office, $15,000–$26,000 for 20 kW, $22,000–$33,000 for 30 kW, $35,000–$55,000 for 50 kW and $70,000–$110,000 for 100 kW, installed after STCs. Per watt the installed price runs $0.70–$1.20, and the wide East Arm and Berrimah sheds sit at the low end of it.
Cyclone-region mounting is what makes a Darwin quote different from a southern one: every array is fixed to a rated frame, and a tilt-frame job on a CBD or Cullen Bay building needs a structural engineering report at $800–$2,000 before the frames go on, with crane or cherry picker hire at $1,000–$3,000 a day to land the panels. Older boards in Stuart Park workshops and the original Casuarina shops add a switchboard upgrade at $1,500–$5,000.
Over 30 kW, network upgrade or connection works at $2,000–$10,000 may be added, and commercial panel cleaning after the build-up and the wet costs $5–$15 a panel. Prices include GST.
Quick answerCommercial solar in Darwin runs $22,000–$33,000 for a 30 kW system in 2026, with roof type, switchboard condition and network connection works setting the total. All figures on this page include GST. Get free Darwin quotes →
Commercial Solar Prices in Darwin 2026: Cost Table and Price List
Service
Low
Typical
High
10 kW commercial system (small shop / office)
$8,000installed
$10,000
$12,000
20 kW commercial system
$15,000installed
$20,000
$26,000
30 kW commercial system
$22,000installed
$27,000
$33,000
50 kW commercial system
$35,000installed
$44,000
$55,000
100 kW commercial system
$70,000installed
$88,000
$110,000
Installed cost per watt, commercial (after STCs)
$0.70per W
$0.90
$1.20
Structural engineering report
$800report
$1,200
$2,000
Switchboard upgrade for a commercial system
$1,500per job
$3,000
$5,000
Network upgrade / connection works (systems over 30 kW)
$2,000per job
$5,000
$10,000
Crane or cherry picker hire
$1,000per day
$2,000
$3,000
Commercial panel cleaning
$5per panel
$10
$15
Scoping commercial solar work in Darwin? Get a quote from a local commercial contractor - free, no obligation.
Prices include GST. Darwin and Palmerston, November 2026.
What does a 30 kW commercial solar system cost in Darwin?$22,000–$33,000 installed after STCs, $27,000 typical. The next sizes: $35,000–$55,000 for 50 kW and $70,000–$110,000 for 100 kW.
What site works get added to a Darwin commercial solar quote?A structural engineering report at $800–$2,000, a switchboard upgrade at $1,500–$5,000 where the board is old, network upgrade or connection works at $2,000–$10,000 on systems over 30 kW, and crane or cherry picker hire at $1,000–$3,000 a day for tower and tilt-frame roofs.
Worked Commercial Solar Cost Scenarios — Darwin
Three Darwin examples priced from the rows above: an East Arm logistics shed, a CBD office building and a Humpty Doo mango farm. Each line names its row; the quote you receive prices your own roof, board and connection.
East Arm logistics shed. A freight operator at East Arm fits 100 kW to a long cyclone-rated shed roof at $70,000–$110,000, with $88,000 typical. Over 30 kW, network upgrade or connection works are quoted on their own line at $2,000–$10,000, and a crane at $1,000–$3,000 a day lifts the panel pallets before the wet.
CBD office building. The owner of a three-storey Mitchell Street office installs 30 kW on rated tilt frames at $22,000–$33,000. The concrete roof gets a structural engineering report at $800–$2,000 for the frames, and the main switchboard is upgraded at $1,500–$5,000 to take the inverter.
Humpty Doo mango farm upkeep. A grower at Humpty Doo runs a 20 kW array installed at $15,000–$26,000 over the packing shed and books commercial panel cleaning at $5–$15 a panel at the end of the dry, when a season of dust and smoke haze has settled on the glass.
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Prices include GST. Darwin and Palmerston, November 2026.
Commercial Solar Costs by Sector in Darwin
Darwin commercial solar runs from the industrial estates at Winnellie, Berrimah and East Arm, through Pinelands and the Yarrawonga units at Palmerston, to CBD offices, Mitchell Street and Cullen Bay hospitality, Casuarina and Coolalinga retail, and the mango, melon and nursery blocks of Humpty Doo, Howard Springs and Lambells Lagoon.
Winnellie, Berrimah and East Arm sheds - Wholesale, freight and port-precinct roofs take 100 kW arrays at $70,000–$110,000, the size at which the installed cost per watt sits nearest the $0.70 floor of $0.70–$1.20.
Pinelands and Yarrawonga units - Workshops and trade units in Palmerston buy 30 kW to 50 kW at $22,000–$33,000 to $35,000–$55,000; over 30 kW they carry network upgrade or connection works at $2,000–$10,000.
CBD and Cullen Bay buildings - Rated tilt frames over concrete need a structural engineering report at $800–$2,000 and crane or cherry picker hire at $1,000–$3,000 a day, on top of a 20 kW or 30 kW system at $15,000–$26,000 or $22,000–$33,000.
Mitchell Street, Casuarina and Coolalinga retail - A bar, cafe or shop fits a 10 kW system at $8,000–$12,000; the original Casuarina shops and older Stuart Park workshops are where a switchboard upgrade at $1,500–$5,000 joins the quote.
Humpty Doo and Howard Springs growers - Packing sheds, coolrooms and nursery blocks run 30 kW to 50 kW at $22,000–$33,000 to $35,000–$55,000, with commercial panel cleaning at $5–$15 a panel at the end of the dry.
What a Compliant Commercial Solar Quote Includes — Cost in Darwin
Before comparing Darwin quotes, check each one prices the same kilowatts and the same panel and inverter brands, states how the installer gets panels and people onto the roof, and shows site works, certificates and GST on their own lines.
System size in kW, panel count, panel and inverter make and model, and whether the inverter is single or three phase
The STC assignment shown as a separate line, so the installed price after STCs and the price before it are both visible
A structural engineering report, priced at $800–$2,000, listed as included or excluded
Switchboard upgrade work, at $1,500–$5,000 where needed, shown as its own line
For systems over 30 kW, network upgrade or connection works at $2,000–$10,000 and who lodges the network application
Crane or cherry picker hire at $1,000–$3,000 a day, and any lift, dock or after-hours access charges for towers
Commercial panel cleaning at $5–$15 a panel if a maintenance visit is bundled, priced per visit
Install, site works and any monitoring or maintenance each on its own line, on a single GST basis
The installer's accreditation number and proof of insurance
Commercial solar cost in Darwin: East Arm sheds, CBD roofs and rural blocks
A Darwin small business starts at $8,000–$12,000 for a 10 kW system installed after STCs (typically $10,000), then $15,000–$26,000 for 20 kW and $22,000–$33,000 for 30 kW. Freight and wholesale sites buy 50 kW at $35,000–$55,000 and 100 kW at $70,000–$110,000, and those arrays are what take the installed cost per watt to the floor of $0.70–$1.20.
The roof and the season then write the rest of a Darwin quote. New sheds at East Arm and Berrimah have clean metal decks, rated purlins and modern boards, so the quote stays near the system price and the job is done in the dry. CBD and Cullen Bay buildings put panels on rated tilt frames over concrete, bringing a structural engineering report at $800–$2,000, crane or cherry picker hire at $1,000–$3,000 a day and a dock booking. The older shops at Casuarina and the workshops around Stuart Park and Winnellie's original estate are where a switchboard upgrade at $1,500–$5,000 most often appears.
The Clean Energy Regulator says eligibility for solar PV systems under the Small-scale Renewable Energy Scheme has been expanded from 100 kW to 1 MW for eligible systems installed from 1 October 2026, with a fixed 5-year deeming period for 100 kW to 1 MW systems, and that STC applications for those mid-scale systems will not open until mid to late November 2026. Existing arrangements for systems smaller than 100 kW are not affected. On a Darwin quote look for the STC line on its own, the name of whoever lodges the network application on a system over 30 kW, where $2,000–$10,000 of connection works can apply, and commercial panel cleaning at $5–$15 a panel priced per visit.
Commercial solar cost by system size in Darwin
Quick answerDarwin pricing steps by kilowatts: a Mitchell Street bar or Casuarina shop sits in the $8,000–$12,000 10 kW bracket, a Pinelands workshop or Humpty Doo packing shed at 20 kW to 30 kW pays $15,000–$26,000 to $22,000–$33,000, and an East Arm or Berrimah shed at 50 kW to 100 kW pays $35,000–$55,000 to $70,000–$110,000.
A larger Darwin array lowers the per-watt figure, $0.70–$1.20 across the range with the 100 kW East Arm sheds at the bottom. Fixed items do not scale: a structural engineering report at $800–$2,000 costs much the same at 20 kW or 50 kW, and a switchboard upgrade at $1,500–$5,000 depends on the board's age rather than the array.
Access and the wet are the other levers on a Darwin job of any size. CBD buildings need crane or cherry picker hire at $1,000–$3,000 a day plus dock and lift slots; harbourside sites at Cullen Bay, Stokes Hill and Nightcliff need fixings rated for salt air and cyclone loads, and installers book the dry season first. Over 30 kW the network upgrade or connection works line at $2,000–$10,000 appears, and commercial panel cleaning at $5–$15 a panel is the running cost at every size.
Frequently Asked Questions — Commercial Solar Cost in Darwin
What is the price of commercial solar in Darwin?
From our Darwin table: $8,000–$12,000 for a 10 kW commercial system (typically $10,000); $22,000–$33,000 for a 30 kW system (typically $27,000); $70,000–$110,000 for a 100 kW system (typically $88,000), all installed after STCs.
How much does a 30 kW commercial solar system cost in Darwin?
A 30 kW commercial solar system in Darwin costs $22,000–$33,000 installed after STCs, with $27,000 typical. A Mitchell Street tenancy on an office roof adds a structural engineering report at $800–$2,000 and crane or cherry picker hire at $1,000–$3,000 a day; a Humpty Doo packing shed on a rated metal roof usually needs neither.
What does a 100 kW commercial solar system cost in Darwin?
Going by our Darwin table, expect $70,000–$110,000 for a 100 kW commercial system installed after STCs; the typical price is $88,000. Winnellie, Berrimah and East Arm sheds are the usual Darwin buyers, and network upgrade or connection works at $2,000–$10,000 are priced on top because the system is over 30 kW.
What is the installed cost per watt for commercial solar in Darwin?
$0.70–$1.20 per watt installed after STCs on our Darwin table, with $0.90 typical. The larger the array the lower the figure: a 100 kW system at $70,000–$110,000 sits near the floor, a 10 kW system at $8,000–$12,000 near the top.
Does a Darwin business need a switchboard or network upgrade for solar?
Often one or both. A switchboard upgrade for a commercial system costs $1,500–$5,000 and is common in the original Casuarina shops and the older workshops around Stuart Park and Winnellie. Network upgrade or connection works at $2,000–$10,000 apply to systems over 30 kW, so ask the installer to show the line and name who lodges the network application.
What changed for commercial solar systems over 100 kW?
The Clean Energy Regulator says the Renewable Energy (Electricity) Regulations 2001 have been amended to expand eligibility for solar PV systems under the Small-scale Renewable Energy Scheme from 100 kW to 1 MW, applying to eligible mid-scale systems installed from 1 October 2026, with a fixed 5-year deeming period; STC applications for mid-scale systems will not open until mid to late November 2026. Existing arrangements for systems smaller than 100 kW are not affected.
Does a commercial solar install in Darwin need a structural engineering report?
A structural engineering report costs $800–$2,000 on our Darwin table, typically $1,200. Owners of CBD and Cullen Bay buildings usually ask for one before rated tilt frames go onto a concrete roof; a single-storey metal unit at Pinelands with rated purlins rarely needs it.
What does commercial solar panel cleaning cost in Darwin?
Commercial panel cleaning in Darwin costs $5–$15 a panel, with $10 a panel typical. Harbourside sites at Cullen Bay and Nightcliff, and Humpty Doo growers at the end of the dry, book it more often; have the quote price it per visit.
Do Darwin commercial solar installers need accreditation?
For mid-scale systems of 100 kW to 1 MW, the Clean Energy Regulator says the system must have its panels, batteries or inverters listed on the Clean Energy Council list of approved components and meet Solar Accreditation Australia install guidelines. Ask for the accreditation number on your Darwin quote and check the panel and inverter models against the listed products.