Battery retrofit · ACT 2905

Quoted after seeing the home

A homeowner with an existing array worked through an approved list, asked six companies, received four quotes, and noticed which of them had visited the home.

A white Tesla home battery mounted on dark blue weatherboard, its mark lit

What the customer wrote

I reviewed all of the companies on the ACT Government approved list for a solar battery to add to my existing solar panel system. I sought quotes from the 6 best rated companies. From the 4 quotes I received I chose SunStak. The main reason I chose them was because they were the most responsive, helpful and reasonably priced, a couple of the others didn't even visit the house before quoting.
Berceuse5 out of 5.Published on SolarQuotes

System specifications

Work
Battery added to an existing array
Approved list
ACT Government battery scheme
Quotes sought
Six approached, four quoted
Site visit
Some competitors quoted without one

About this job

What a battery retrofit depends on

Adding storage to an existing array is governed by what is already installed. The inverter decides whether the battery is AC or DC coupled. The switchboard decides whether backup circuits can be separated. The meter, the wall and the distance between them decide the cable. None of that is on the roof, and none of it is visible from the street.

Why a visit changes the price

A quote written without a visit assumes a standard home. Standard switchboard with spare ways, short cable run, a wall that will take the weight, no asbestos, no heritage overlay. When one of those assumptions fails, the number moves after the contract is signed. A quote written after a visit can be wrong too, but it is wrong about less.

Comparing four quotes

Battery quotes look alike on paper because the hardware list is short. The differences sit around the hardware. Who answered, who came out, who explained what the existing system could and could not do, and whether the price held. A homeowner comparing four of them is comparing the process.

How we work

The job above ran the way every Sunstak job runs. From your first energy bill to switching on your system, we guide you through every step.

  1. A cyan sign board standing on a driveway, lettered sunstak above the words THIS HOUSE IS POWERED BY SUNSTAK with the address sunstak.com.au along the bottom, the front of a white car in the left foreground and timber steps with two orange traffic cones behind it

    Share your energy bills

    Send us a summer bill and a winter bill, and tell us when you use the most energy. This helps us design around your household.

  2. Two men reaching to shake hands on the front path of a brick house with solar panels on its roof, one of them in a dark t-shirt carrying a circular cyan mark, while a woman stands in the open front doorway behind them

    Talk to an Energy Geek

    During a home visit or phone consultation, we discuss your goals and review your roof, switchboard and meter.

  3. Two people at a desk in an office, one pointing at a wide monitor showing an aerial view of a house with a solar panel layout drawn on its roof

    See your system design

    Our engineer designs your system in house. You’ll see where the equipment will go and understand why it suits your home.

  4. A man at a timber desk holding a telephone handset to his ear, two monitors in front of him showing an aerial view of rooftops and a bar chart, beside a keyboard, an open notebook and a mug

    Review your quote

    Your quote clearly lists equipment, model numbers, inclusions and exclusions. Take your time to review it. We only order once you approve.

  5. A person standing on a tiled roof holding a large solar panel above their head against a blue sky, with another person's hand reaching up from the gutter below

    Get ready for installation

    We explain what to expect on the day, including any planned power interruptions and how long they should last.

  6. A single-storey timber-clad house on a dry rural block at golden hour, its pitched metal roof covered by a full array of solar panels, a white battery standing against the timber wall beside a car charger with its cable coiled, a dark grey car parked on the gravel driveway and gum trees and low hills behind

    Enjoy ongoing support

    We get your system running and set up your monitoring app. For questions, service or warranty help, the same team is here after installation.

More of the work

See more of our recent projects, with customer reviews and client feedback.

  • Tesla Powerwall 3 ACT 2906

    The spot stayed, the battery changed

    The standards decide where a battery can sit: clearances, the wall behind it, and the run back to the switchboard. Here the position the owner wanted stayed, and the battery changed to one rated to live outdoors. A plumber capped a disused gas line on the same visit.

    Everything was smooth from the initial quote, through to the installation. There was some initial back and forth about which type of battery to install and location. In the end my preferred location was not going to meet standards which then meant having to change the brand of battery to one that would be more suitable outdoors. This was all handled well by Michael and the team.
    Steve SolarQuotes
    Battery capacity
    13.5 kWh
    Siting
    Rated for outdoors
    On the day
    Plumber capped a gas line
    A single white Tesla-badged battery mounted on the grey rendered wall of a house, beside a timber-clad corner and a tall narrow window, standing on a pale timber deck in hard sunlight
  • Second Tesla Powerwall ACT 2600

    A second battery, and the first one fixed

    The owner already had a battery from another company, installed a year earlier, and wanted a second one beside it. We inspected that first install as part of the job. Faults nobody could see at quoting turned up on the day, and we corrected them at no charge.

    Sunstak have just added a second Tesla Powerwall battery to my system, which had been installed a year ago by another provider. … The quality and professionalism of the installation was particularly impressive. Several deficiencies in the installation of the existing battery by my previous supplier were rectified without cost or question, even though some were not apparent at the time of quoting.
    Peter SolarQuotes
    Battery capacity
    27 kWh, two units
    Existing battery
    Fitted a year earlier by another provider
    Rectification
    Previous supplier's defects, no charge
    Two white Tesla-badged batteries standing side by side against a board-formed concrete retaining wall on a paved terrace, with ornamental grasses along the top of the wall and trees behind
  • Commercial rooftop solar Wanniassa ACT

    A school hall in Wanniassa

    A school roof is a set-out problem with a deadline attached. We planned, delivered and commissioned the array inside the break before the new term. Somebody else coordinated the site. 40 kW of panels onto one long hall roof, in five days, with six people on it.

    Thank you for delivering this project before the start of a new school term
    Project Manager, Trinity Christian School Sunstak Capability Statement, July 2025
    Panels
    Trina Solar
    Inverter
    30 kW Sungrow commercial
    Solar
    40 kW
    On site
    Five days, six staff
    Overhead aerial view of four long rows of solar panels on the curved-ridge roof of a large school building, with a playground and a yellow climbing frame in the yard alongside
  • Commercial solar and battery Lyneham ACT

    A temple in Lyneham

    Community members referred the temple, worried about its power bills. The complex is large and draughty, and expensive to heat. 20 kW of solar and a 20 kWh battery, with the meter board upgraded to carry it. The battery holds the demand peak down, which a commercial tariff charges separately from the energy.

    The Abbot is very pleased and wishes to pass on his appreciation and support to get this project delivered
    Project Manager, Wat Dhammadharo Sunstak Capability Statement, July 2025
    Solar
    20 kW
    Battery
    Sungrow SBH Battery
    Battery capacity
    20 kWh
    Switchboard
    Meter board upgraded
    Aerial view of solar panels across the tiled roof of a long brick building, with a spire-roofed hall beside it and gilded temple roofs among trees behind

Get a design for your home

Speak with one of our Energy Geeks today.

  • Tesla Powerwall Premium Certified Installer
  • New Energy Tech Consumer Code approved seller
  • SunWiz 2026 award: Best Rated solar installer, #2 Most Popular in the A.C.T.
  • Solar Accreditation Australia approved

★★★★★

Having used two other installers previously, the Sunstak experience is head and shoulders superior…
Raffaele WebbGoogle review
  • 4.9From 216 Google reviews
  • 5.0From 29 SolarQuotes ratings

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