Solar Inverter Replacement Cost Australia 2026: $1,448 to $6,689 by Type, Labour and Rules

What an inverter replacement costs in October 2026

We price a replacement from two sourced parts. The inverter at a trade list price with GST added: $1,199 for a 5 kW budget single-phase string unit, $2,688 for a 5 kW quality string unit, $2,342 to $4,536 for 8 to 10 kW three phase and $3,794 to $5,939 for a 5 to 10 kW hybrid, from price lists checked 27 October 2026. The labour: a Brisbane electrician's published labour-only swap price of $249, and a derived range up to $750 from market electrician rates over 2 to 4 hours. Add them and a like-for-like 5 kW swap floors at $1,448 to $3,438, three phase at $2,591 to $5,286 and a hybrid at $4,043 to $6,689.

These are floors, not quotes. An installer marks up the hardware, may charge a call-out before the swap, and may need new isolators, cable or paperwork. The installed prices on installer and repair pages checked 27 October 2026 sit within or above these floors, and none of them separates hardware from labour. Ours does.

Supply prices by inverter type

Trade list prices from two Australian wholesaler and electrical supply sites checked 27 October 2026, ex GST as published, with GST added in the third column. In words: the cheapest mainstream 5 kW single-phase unit is $1,090 ex GST, a quality-brand 5 kW unit is $2,444, three-phase 8 to 10 kW units run $2,129 to $4,124 and single-phase and three-phase hybrids $3,449 to $5,399. No public Australian list price was found for a microinverter or a DC optimiser on the day we checked, so those rows carry no figure; installer pages quote whole-system ranges only.

An installer buys at or below these prices and sells above them. A quote that lists the inverter at twice the trade price is paying for the business, not the box; ask for the model number and look the price up.

Labour for a like-for-like swap

One Brisbane electrician publishes a labour-only price for a same-brand swap: $249, with the note that extra parts or wiring change it (service page checked 27 October 2026, undated). A dated repair guide puts a straightforward swap at 2 to 4 hours on site, a full day if a hybrid and battery go in at the same time. At the market electrician rates in our data ($80 to $150 an hour, call-out $50 to $150), 2 to 4 hours comes to $160 to $600 plus the call-out, or $210 to $750 all up. The award wage for a licensed electrician over the same hours is $64 to $129, which is what the business pays before on-costs, vehicle and overheads. We use $249 to $750 as the labour band on this page; the hours are our assumption, taken from the guide, not a measured figure.

Why the installed price is more than supply plus labour

• Margin on hardware. Trade price to retail price; the gap pays for the warranty claim the installer will lodge for you in year six.
• Diagnosis before the swap. A call-out to confirm the inverter, not a panel string or an isolator, has failed is charged separately on most repair pages (the dated guides we checked list a diagnostic visit at $150 to $300).
• Compliance hardware. A unit from the AS/NZS 4777.2:2015 era may need a new DC isolator, AC isolator, labels or a smart meter for export limiting.
• Paperwork. A certificate of compliance for the electrical work in every state, and a distributor notification or application where the rules below require one.
• Access. An inverter in a garage is a two-hour job; one on a two-storey wall needs a platform.

Standards and network rules a replacement must meet

Every inverter installed from 18 December 2021 must be listed as compliant with AS/NZS 4777.2:2020; a unit certified only to the 2015 edition cannot be installed and would not be eligible for certificates (regulator notice, September 2021). A replacement is a new installation of an inverter, so the current edition applies even though your panels predate it. The installer sets the regional power-quality settings the distributor requires (Australia A on most east-coast networks, B on the Perth network, C on the Tasmanian and regional WA networks) and connects the unit to the distributor's remote control where the network requires it: in Victoria the emergency backstop applies to new, replacement and upgraded systems installed and approved from 1 October 2024, so a replacement inverter there must be on the approved CSIP-AUS list and stay on the internet; in Western Australia a Perth repairer's dated page reports new minimum technical standards for systems installed from 1 May 2026.

Fees: the ACT distributor charges nothing for a like-for-like replacement and $299 for an enquiry that adds a battery, an export limit or capacity. Other distributors publish no replacement-specific fee on the pages we fetched. Your city page carries the connection limits for your network; the Melbourne page covers the backstop networks.

When a replacement changes your export limit or needs a new application

• Same size, same type, same phase. A like-for-like swap keeps your existing connection agreement. The installer lodges the certificate of compliance and tells the distributor through its portal where the network asks for it; no new export limit is set.
• Bigger inverter or a new phase. A 5 kW to 8 kW change, or single to three phase, is a new application under the current rules, and the export limit on the new agreement may be lower than the one you had (most single-phase networks cap exports at 5 kW or less, and the dynamic-export networks will put a new connection on flexible export by default).
• Hybrid with a battery. Treated as an upgrade: new application, backstop or relevant-agent compliance where the state requires it, and on the South Australian network a battery added to existing panels may keep the existing export limit (its technical standard says so) while a change of inverter does not.
• Old agreement with a generous limit. If your current connection allows 10 kW export on single phase under a pre-2020 agreement, a size change forfeits it. Ask the installer to confirm which limit the distributor will apply before you choose the unit.

Check the warranty before you pay, and the years by model

Before paying anyone, find the inverter's install date and model. Most string inverters sold in the last ten years carry 5 or 10 years; the table gives the terms from the manufacturer warranty documents we read on 27 October 2026. If the unit is inside its term, the claim goes to the manufacturer through the installer or, if the installer has closed, directly; you pay the labour to swap the unit unless the warranty covers it. If the retailer has closed and the manufacturer has left the market, there is no warranty to claim and the figures on this page are what you will pay. Registering a new inverter on the day it is installed is what turns a Fronius 5-year term into 10 and a GoodWe 5 into 10.

No STCs on a like-for-like replacement

Small-scale technology certificates are calculated on panel capacity: kW x zone rating x deeming years, rounded down. The regulator's eligibility page (updated 18 September 2026) lists the cases: replacing one, some or all panels on a system that has already claimed is not eligible; adding a new inverter with new panels is eligible only for the new panels; a whole new system with new panels and a new inverter is eligible as a "replacement system". An inverter on its own is not a listed case because it has no panel capacity to deem. A Perth repairer's dated page says the same in one line: federal certificates apply to new panels, not to an inverter replacement.

What a whole replacement system earns instead: 6.6 kW in Zone 3 (Sydney, Brisbane, Perth, Adelaide) is 45 certificates, $1,755 at $39 each; in Zone 4 (Melbourne, Hobart, Canberra) 39 certificates, $1,521. The Sydney standard offer for a complete 6.6 kW system after that discount is $6,170 this month, Melbourne $6,218, national $6,774. Deeming drops from 5 to 4 years on 1 January 2027, which cuts the Zone 3 figure by about $351. The cost pillar has every size and city.

Replace like for like, or go hybrid and add a battery

Three paths, with the sourced numbers.

• Like for like. $1,448 to $3,438 for 5 kW single phase. Right when the panels are under ten years old, the roof has no room to grow and you have no battery plans.
• Hybrid now, battery later. The trade premium for a hybrid 5 kW unit over the same brand's string unit is $1,005 ex GST, $1,106 with GST. You pay it once instead of paying for two inverter swaps. Right when a battery is likely within the hybrid's warranty term; note that a hybrid without a battery still needs the backstop or relevant-agent compliance in the states that require it.
• Hybrid and battery together. A 10 kWh battery is $9,500 to $12,500 installed before the federal discount; the discount is $2,652 on 10 kWh and $3,705 on 14 kWh at $39 per certificate, so the battery nets $6,848 to $9,848 on top of the hybrid. One application, one certificate of compliance, one visit. Right when the panels will outlast the battery warranty.
• Whole new system. If the panels are 12 years old or more, compare the swap against $6,170 in Sydney or $6,218 in Melbourne for a new 6.6 kW system after STCs, which the old panels will never earn. The removal and reinstall page has that arithmetic.

Repair or replace

Repair pages checked 27 October 2026 quote workshop repairs from under $100 for an external plug to a few hundred dollars for a fan, board or capacitor, with a short guarantee on the repair. The installer rule of thumb on two of the dated pages is to replace when a repair costs more than 40 per cent of a new unit; it is a heuristic, not a standard. Two facts weigh more than the ratio: a repaired 2015-edition inverter keeps its old settings and standard, while a new one meets AS/NZS 4777.2:2020 and the network's current requirements; and a new unit restarts the warranty clock at 5 or 10 years. For a unit past eight years, replacement is the usual answer on every page we read, including the repairers' own.

Checklist for the replacement quote

• Model number, AC rating in kW, phase, and that the model is on the Clean Energy Council approved list as 2020 compliant.
• The panel array's DC capacity against the new inverter's maximum PV input: a 6.6 kW array on a 5 kW unit is within the 1.5 oversizing ratio on the datasheets we hold; a 7.5 kW array on an old 5 kW hybrid may not be.
• Hardware and labour as separate lines, and whether a diagnostic call-out already paid is credited.
• Who lodges the certificate of compliance and the distributor notification, and whether the export limit changes.
• Warranty term, the registration the installer will do, and who you call in year six if the installer has closed.
• What happens to the old unit: disposal is the installer's, and an inverter is e-waste in every state.
• Run the price through the quote check if the quote bundles new panels: that part earns certificates and should show them.

Inverter replacement questions