Solar battery installation in Melbourne's South East by our own team
Helcro Electrical does solar battery installation across Melbourne’s South East from our Cheltenham workshop, on new solar or solar you already have. We are a SiGENERGY Certified Installer, a Tesla Powerwall Certified Installer and a Sonnen Certified Partner, and our own licensed electricians do the work.
An 8 kWh SigenStor starts from $8,400 supplied and installed on a single-phase home, including GST, after the federal discount (October 2026). On solar you already have, we price it after the site assessment. See all SigenStor prices. Call for an indicative price at no cost. Your written quote follows a $50 site assessment, where we check your switchboard, phase, inverter and battery spot.
Call 1300 201 358 → Get a Quote →
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In business since 2006 · Registered Electrical Contractor REC 35448 · NETCC Approved Seller for solar and batteries · 10-year workmanship warranty on solar and batteries
5.0★ Google (73 reviews)
Certified solar battery installers for SiGENERGY, Tesla Powerwall and Sonnen
Helcro Electrical is registered with Energy Safe Victoria as an electrical contractor (REC 35448), and is a NETCC Approved Seller for solar and batteries and an authorised retailer on Solar Victoria's list. Our accredited designers and installers cover battery storage, and they are our own team: we do not subcontract.
SiGENERGY SigenStor installer: the battery we install most
We supply the SigenStor in 5 kWh and 8 kWh LFP modules, up to 48 kWh: from 5 kWh on single-phase homes and from 8 kWh on three-phase homes. SiGENERGY came first for home batteries in SolarQuotes' 2026 Installer's Choice survey, with 26% of the votes of 125 vetted installers (published July 2026).
A SigenStor EV DC module can add EV charging to the same system.
Tesla Powerwall installer in Melbourne's South East
We are a Tesla Powerwall Certified Installer and do Tesla Powerwall installation across this area. The Powerwall 3 has 13.5 kWh usable, its solar inverter built in and room for up to 3 Expansion units. Tesla's Australian datasheet gives up to 11.04 kW AC of continuous power per unit and up to 20 kW DC of solar. See Powerwall 3 on existing solar and Powerwall 3 blackout backup.
Tesla's warranty excludes installation by anyone other than Tesla or a Tesla certified installer, so the certification matters. Call 1300 201 358 about a Powerwall 3 →
Sonnen, Sungrow and the other batteries we install
As a Sonnen Certified Partner we install the Sonnen Batterie Evo, and Sonnen's warranty also depends on an installer certified by Sonnen.
We install the Sungrow SBR 16 kWh kit and the Enphase IQ Battery 5P too, and our solar battery comparison shows which suits which home. We also install GoodWe and LG batteries. Shop prices on product pages are for the equipment only; installed prices are quoted.
Solar battery installation cost in Melbourne's South East
Solar battery installation in Melbourne's South East starts from $7,600 for a 5 kWh SigenStor on a single-phase home, or from $8,400 for the usual 8 kWh starting point ($10,900 three-phase). Prices are supplied and installed, including GST and after the federal discount, as at October 2026. Other brands are quoted for your home. Approximate SigenStor prices on the same basis:
| Battery size | Single-phase home | Three-phase home |
|---|---|---|
| 5 kWh | from $7,600 | not available |
| 8 kWh | from $8,400 | from $10,900 |
| 10 kWh | from $10,800 | from $13,300 |
| 13 kWh | from $11,600 | from $14,100 |
| 16 kWh | from $12,400 | from $14,900 |
| 24 kWh | from $16,400 | from $18,900 |
| 32 kWh | from $20,400 | from $22,900 |
| 40 kWh | from $25,600 | from $26,900 |
| 48 kWh | from $29,600 | from $30,900 |
These are starting prices, and a larger SigenStor controller costs more. They don't apply when a battery is added to solar you already have: we price that job after the site assessment. Your written quote, after a $50 site assessment, sets the exact price. What moves it, and why quotes for the same battery differ:
- Your solar: whether you already have it, and whether a separate inverter is needed.
- Your switchboard: a home switchboard upgrade is typically $1,250 to $2,500 (a small board is at the low end). Any switchboard work is in your written quote.
- The spot: where the battery can physically go.
- What's included: compare the battery size, backup hardware, switchboard work and discount rate on each quote.
How the federal discount affects your price
The federal Cheaper Home Batteries Program is worth about $250–$270 per usable kWh on the first 14 kWh as at November 2026, about $2,600–$2,800 off a 10 kWh SigenStor (10.4 kWh usable). Above 14 kWh usable the rate is lower, so more storage earns less per kWh. We size the battery to what you use.
It steps down on 1 January 2027, and the prices above are based on the rate until then. The date your Certificate of Electrical Safety is issued sets the rate, not your deposit or the site visit.
Eligibility depends on the exact model and set-up, including the Clean Energy Council approved battery list; we check it before we quote. Our battery rebate guide has the full rules.
How a solar battery installation works, step by step
- Call 1300 201 358 or send the form. We give you an indicative price on the phone, at no cost.
- A $50 site assessment (site inspection). We look at your switchboard, your supply phase, any existing solar and inverter, and where the battery can go.
- A written quote. The exact battery, inverter, any backup hardware and any switchboard work.
- Network approval. Adding a battery needs your electricity distributor's approval first, so we apply before installing. Across nearly all our area that is United Energy; part of Caulfield North is on CitiPower.
- The installation. Our own licensed electricians fit the battery and wire it in.
- Inspection and certificate. In Victoria a home battery installation, including one added to existing solar, is prescribed electrical work: an independent licensed electrical inspector checks it before your Certificate of Electrical Safety is finalised and before it is switched on.
- Commissioning and handover. We commission the system and give you the handover instructions for it. We lodge the alteration with your distributor with your certificate.
Where a solar battery can be installed
Under Solar Victoria's guidance on AS/NZS 5139, a home battery can't go in living areas or bedrooms, ceiling spaces or wall cavities, or under stairs. Escape routes are also ruled out unless at least 1 m stays clear to get past the battery, and so are most roofs. A garage or outside wall can work if it meets clearance and protection rules, and we check your spot on site against the current AS/NZS 5139 standard. Vehicle protection or a non-combustible barrier may be needed, depending on the spot.
A SigenStor is IP66 rated, but SiGENERGY says to install it somewhere sheltered, out of direct sun and rain, and at least 500 m from corrosion sources such as the seaside. On homes closer to the bay than that, we keep it inside, in a spot that meets the rules above.
Add a battery to existing solar
You may be able to add a battery to existing solar and keep your existing solar inverter:
- SigenStor: it can be DC or AC coupled. An existing solar inverter can stay alongside it, but not an existing hybrid inverter.
- Powerwall 3: it can usually be added to existing solar, subject to sizing limits on your solar inverter.
We can add a battery to solar another company installed, keeping the existing inverter or replacing it, depending on the situation. We check your inverter at the site assessment and tell you whether it can stay and what to expect before you go ahead. The SigenStor table prices don't apply to a battery added to existing solar: we price it after the site assessment. We also check your phase and your switchboard, because a battery usually adds a circuit and the board needs room for it.
Have your inverter's make and model handy when you call: Call 1300 201 358 →
Getting solar too? See solar panel installation prices, or home electrification for the whole house.
Backup power in a blackout
Whether a battery keeps your lights on depends on its set-up:
- SigenStor: backup with the Sigen Energy Gateway, for the whole home or selected circuits (often called "EPS"), within the system's power rating. It switches without a noticeable break. With no Gateway there is no blackout backup, so tell us if you want backup and we include it in your written quote.
- Powerwall 3: backup through Tesla's Backup Gateway 2, for the whole home or some loads. On a three-phase home only one phase provides backup. Tesla says a Powerwall can also recharge from your solar during an outage.
An existing solar inverter normally shuts down in a blackout. Whether your panels can keep charging the battery depends on the set-up, so we check it at the site assessment.
Our 10-year workmanship warranty and the makers' warranties
Helcro Electrical adds its own 10-year workmanship warranty on every battery installation, from the commissioning date on your Certificate of Electrical Safety. If our workmanship is at fault, we repair it at our cost, or redo the work where a repair isn't practical. It transfers to a later owner of the property for the rest of the 10 years if we are told in writing of the change of ownership and given the new owner's contact details.
Something wrong later? Call 1300 201 358 or email accounts@helcro.com.au. Full terms: warranty conditions.
How long does a solar battery last?
In a night's use, it is simple division: 10 kWh at a steady 1 kW lasts about 10 hours, less with heavy loads on. Over its life, the SigenStor and Powerwall 3 both carry a 10-year maker's warranty, which is the firmest guide to lifespan:
- SigenStor: 10 years on the battery and controller, with at least 70% of usable energy for 10 years or a minimum energy throughput, whichever comes first. SiGENERGY's 10-year warranty needs the system kept connected to the internet; after over a year offline the cover drops to 5 years. The Sigen Energy Gateway has its own 5-year warranty (inverter system warranty).
- Powerwall 3: 10 years, with at least 70% of the 13.5 kWh at 10 years. If it isn't kept connected to the internet, Tesla will honour at least 4 years.
Where we install solar batteries in Melbourne's South East
We install solar batteries in Cheltenham, Highett, Mentone, Parkdale, Moorabbin, Bentleigh, Bentleigh East, Brighton, Sandringham, Hampton, Beaumaris, Black Rock, Aspendale, Aspendale Gardens, Edithvale, Bonbeach, Carrum, Carrum Downs, Frankston and Caulfield, and in the other South East suburbs we cover.
WHAT OUR CUSTOMERS SAY
Karyn Pajmon (Google review, SiGENERGY three-phase battery and panels)
Renate El-Shataly (Google review, back-up battery added to existing solar)
Solar battery installation questions
How much does it cost to install a solar battery?
From $7,600 for a 5 kWh SigenStor or $8,400 for 8 kWh on a single-phase home, supplied and installed, including GST and after the federal discount (October 2026). See the full price table.
What size solar battery do I need?
It depends on what you use after dark and whether you want backup, so we size it at the site assessment. An 8 kWh SigenStor is the usual starting point for a home in Melbourne’s South East.
How do I choose a solar battery installer?
Check the electrical contractor’s licence on Energy Safe Victoria’s public register, ask for accredited designers and installers, and check the maker’s certification, because Tesla’s and Sonnen’s warranties depend on it. Then ask who actually does the work: we don’t subcontract.
How much does a Tesla Powerwall 3 cost installed?
We don’t publish a Powerwall price. Call for an indicative price at no cost; your written quote follows the $50 site assessment.
Is a solar battery worth it?
It depends on how much solar you export and how much power you buy after dark; we don’t publish a payback figure. Your tariff matters too: see the Victorian Midday Power Saver.
Who does the rebate paperwork?
We do, and the discount comes off your quote. The battery must be connected to new or existing solar, and the program supports one battery system per premises, so tell us if your home already has one.
Is there a Victorian battery rebate?
No. Solar Victoria is no longer taking applications for its interest-free battery loans. The discount is the federal one.
Can any electrician install a solar battery?
No. In Victoria a home battery installation is prescribed electrical work, so a licensed electrician does it and an independent licensed inspector checks it before it is switched on. For the federal discount the installer must also hold Solar Accreditation Australia (SAA) accreditation with a battery endorsement. So not every electrician can, and you can’t do it yourself.
Can I put a battery in an apartment or unit garage?
Only with approval: you always need your owners corporation (body corporate) to approve an installation in a joint dwelling.
Can I add more battery later?
Yes. A SigenStor grows in modules up to 48 kWh, and a Powerwall 3 takes up to 3 Expansion units. The federal discount is paid once per premises, so storage added after your battery has had the discount gets none. We check this before we quote.
Get an indicative solar battery price
Tell us your suburb, what solar you have and whether you want blackout backup, plus your phase if you know it. Call now, or send the form and we will call you back within 2 business hours. Your written quote follows a $50 site assessment.
Page by Helcro Electrical, REC 35448. Prices as at October 2026. Discount and rules on this page checked 3 November 2026.