AC-coupled: add storage alongside
An AC-coupled battery connects on the home’s AC side and works alongside your existing solar inverter. When that inverter is compatible, this can let you keep the equipment you already have.
Battery retrofit assessment
Add a battery to your existing solar system
Already have solar? We assess your inverter, array, switchboard and household priorities before recommending a battery. If your existing equipment is compatible, you may be able to keep it; if it needs changing, we’ll explain why and quote that work separately.
What a battery retrofit costs
Adding a battery to existing solar starts from $3,499 inc GST for a 15kWh Sofar, or from $5,990 inc GST for a 27.84kWh FoxESS, where your current inverter is compatible. If the inverter needs replacing, that's quoted separately after we assess it.
*From-prices inc GST and federal battery discount; final price confirmed in your written quote.
These are starting prices, not a promise that every property can use the same equipment or scope. The final quote reflects compatibility, cabling, electrical work and any inverter change required. We check the installation details before confirming the exact price so the quote is clear about included equipment and work.
AC-coupled or DC-coupled?
DC-coupled or hybrid inverter: update the conversion
A DC-coupled battery connects with a compatible hybrid inverter. This route can suit older or incompatible equipment, or a system that needs an inverter swap. We confirm which arrangement fits your inverter before quoting.
The distinction is about how solar, battery and household power are connected—not simply which battery brand you choose. For a deeper walkthrough of AC and DC coupling, compatibility and the questions to ask, read our full battery retrofit guide.
Will my inverter work with a battery?
We check the inverter make, model, age and operating condition against the battery’s compatibility requirements. We also review the solar array, switchboard, planned battery location, household demand and any backup or future EV-charging priorities. Those details determine whether your present inverter can stay, whether an additional interface is required, or whether a replacement system is the better fit.
We commonly assess retrofit options around equipment from brands such as GoodWe, Sungrow, Fronius, Solis and Enphase. Compatibility depends on the specific model and system configuration, so a brand name alone is not enough to confirm a match. If you can share clear photos of the inverter label, switchboard and any monitoring display, that helps us prepare the assessment.
Inverter and solar array
Model details, array configuration and system condition guide the compatibility check.
Switchboard and wiring
We identify electrical requirements, protection and any work to include in the proposal.
Battery location
Available installation space and practical cable paths form part of the site assessment.
Your energy priorities
Evening use, backup needs, EV charging plans and budget help shape the options we discuss.
The rebate steps down in 2027
The federal Cheaper Home Batteries discount is scheduled to reduce from 1 January 2027. If you’re considering storage, request an assessment and quote now so we can check your system and explain the rebate available under the current rules. Eligibility and discount amounts depend on the equipment and program requirements at the time of installation.
Check battery rebate informationWhat our customers say
★★★★★
Google review“We recently installed solar panels and GoodWe battery system at our home and very impressed with their service. The installation process was smooth. The team was friendly and professional. Highly recommended.”
— Bijoy J.
★★★★★
Google review“Excellent service from start to finish. The Fox ESS battery has been performing exactly as promised and has helped us get much more value from our solar panels. Communication throughout the installation was excellent.”
— Happy Mandair
★★★★★
Google review“We had a great experience with G Gill Electrical from start to end. The Fox ESS battery has lived up to expectations and we are very happy about their services. It's helping us make better use of the energy made by our solar panels. They kept us informed throughout the entire installation process, and they communicated with us professionally. We're very pleased with both the service and the results.”
— Pargat Singh
Read more customer testimonials.
Battery retrofit FAQs
Can I add a battery to any solar system?
Not every existing system can accept every battery. We check the inverter model, solar array, switchboard and property setup to confirm compatible options and the work required.
How much does it cost to add a battery?
Current starting prices are $3,499 inc GST for a 15kWh Sofar where the existing inverter is compatible, or $5,990 inc GST for a 27.84kWh FoxESS on compatible equipment. Final pricing depends on assessment; any inverter replacement is quoted separately.
Do I have to replace my inverter?
No. If your existing inverter is compatible and suitable, an AC-coupled battery may be added while keeping it. An older or incompatible system may need a hybrid inverter or replacement; we check first and explain the cost.
Which batteries do you install?
We assess options from brands including Sofar, FoxESS and Tesla, among others, against your inverter compatibility, storage needs, backup preferences and budget.
Is the battery rebate still available?
The federal Cheaper Home Batteries discount is available under current program rules and is scheduled to reduce from 1 January 2027. Eligibility and the applicable amount depend on the system and current rules; see our battery rebate page for current details.
Compare options on our solar battery brands page, explore the Tesla Powerwall, or use our interactive calculators.
Battery retrofit assessments in Melbourne’s west
We assess existing solar systems in Aintree, Point Cook and Tarneit, and across Melbourne’s west and nearby service areas.
Ready to add storage to your solar?
Share your inverter details and we’ll assess the options for your system.