If you are researching home batteries, you already know there is no shortage of choice. Tesla, BYD, Sungrow, SigEnergy, iStore, and Fronius all promise lower power bills, backup during outages, and more value from your solar. But they are not all the same. The best solar batteries for your home depend on your budget, your household, and what you want the battery to do.
This guide covers six of the most popular batteries for Perth homes in 2026. We explain what makes each one different, roughly what they cost, and who they tend to suit. We also cover how rebates affect the price, and how to think about sizing, especially if you are planning ahead for an EV or bigger power bills.
Battery Comparison at a Glance
Here is a quick side-by-side look at the six batteries in this guide. We leave pricing out of the table on purpose. Price depends on your capacity, inverter setup, and current rebates, so talk to us for a tailored quote.
What to Look for in a Home Battery
Before we look at specific products, here are the main things worth thinking about:
- Capacity (kWh): this is how much energy the battery can store. Bigger is not always better. It depends on how much power your home uses in the evening, and whether you are planning for future changes like an EV.
- Modular vs all-in-one: some batteries, like Tesla Powerwall, come as one complete unit with the inverter built in. Others, like BYD, Sungrow, iStore and SigEnergy, are made up of smaller modules you can stack together. This lets you start smaller and add more later.
- Inverter compatibility: most batteries need to work with a compatible solar inverter. Some brands, such as Tesla and SigEnergy, include their own inverter. Others, such as BYD, iStore and Fronius, pair with specific inverter brands. This can affect cost if you need to replace your existing inverter.
- Warranty: most quality batteries come with a 10-year warranty. But the fine print, meaning how much capacity you are guaranteed to still have after 10 years, varies. Look for at least 70-80% capacity retention.
- Indoor vs outdoor rating: if your battery needs to live in a garage, alfresco area, or anywhere exposed to weather, check its IP (weatherproofing) rating. This matters even more if you are near the coast.
- VPP eligibility: Virtual Power Plant programs let you earn credits by sharing stored energy with the grid during peak periods. All six batteries in this guide can join a VPP when paired with a compatible inverter and monitoring system. If a VPP interests you, mention it when you get a quote so we can factor it into the system design.
How Much Battery Storage Do You Need?
As a starting point, most Perth households need roughly 60% of their daily electricity use in battery storage to cover a typical overnight draw. Here is a rough guide by household size:
These are general starting points only. Our team looks at your actual usage data and any future plans, such as adding an EV or switching from gas, before we recommend a size.
Why We Only Recommend Mid-to-Premium Brands
You will notice all six batteries in this guide sit in the mid-to-premium end of the market. That is a deliberate choice. There are many lower-cost, lesser-known batteries on the market. They can look tempting on price, but we do not install them. Here is why:
- Warranties that actually get honoured: a 10-year warranty is only as good as the company behind it. Established brands are far more likely to still be operating, and still honouring claims, a decade from now.
- A genuine presence in Australia: these brands have local distributors, warehouses and supply chains, so replacement parts and units are actually available if something goes wrong.
- Real after-sales support: if you need a fault diagnosed or a warranty claim processed, these manufacturers have dedicated support teams for it, not just an overseas email address.
- Local staff and technical teams: Australian-based staff mean faster responses, parts that meet local standards, and support that understands Australian conditions and rules.
- A proven track record: these batteries have gone into large numbers of real homes, for long enough to show how they actually perform over time, not just on a spec sheet.
- Safety and compliance you can trust: mid-to-premium brands work hard to meet, and stay ahead of, Australian safety standards. They also have mature quality control on the cells and battery management systems inside.
- Better resale and upgrade value: a recognised, well-supported brand is more attractive if you sell your home. It is also easier to expand or connect to future products like EV chargers.
Peace of mind matters here. A battery is a 10+ year investment sitting on your wall or in your garage. We would rather you pay for a brand that is still around, still supported, and still performing in a decade. That beats saving a little upfront on something unproven that could leave you without support if it fails.
SigEnergy SigenStor
SigEnergy is a newer name in Australia. But it is making waves with a system that bundles a lot of technology into one product. It combines a hybrid inverter, battery storage, and a built-in EV charger, all working together. It is built from 9kWh modules, so it is designed to grow with your home over time.
- Capacity: modular in 9kWh steps. Common configurations include 9kWh, 18kWh, 27kWh and 36kWh, with larger setups available by adding more modules
- Standout feature: it can charge an electric car directly from your solar, with no separate EV charger needed. Some models support V2X (vehicle-to-everything), which lets compatible EVs help power your home during an outage
- Warranty: 10 years
Best for: households planning to get an electric car, or anyone who wants a system built to expand as their needs grow, without starting again from scratch.
Sungrow SBR and SBH
Sungrow is one of the biggest names in solar inverters worldwide. It offers two modular battery ranges for Australian homes. The SBR range stacks in 3.2kWh blocks for smaller systems. The newer SBH range uses larger 5kWh modules, starting at 15kWh and stacking up to 40kWh in a single unit. This makes SBH a good fit if you want a lot of storage from one battery.
- Capacity: SBR is modular in 3.2kWh blocks, from around 9.6kWh up to 25.6kWh. SBH is modular in 5kWh blocks, from 15kWh up to 40kWh in a single stack
- Standout feature: one of the better cost-per-kWh options on the market. SBH offers a simple way to get a large amount of storage from one stacked unit if your home uses a lot of power
- Warranty: 10 years
Best for: households after a cost-effective way to get a decent, or very large, amount of storage from a well-established brand.
iStore
iStore is an Australian-owned company. It was originally known for hot water systems and has since moved into home batteries. Its batteries are positioned as an affordable, locally-backed option, with a fully modular design.
- Capacity: modular from 5kWh up to 30kWh
- Standout feature: 100% usable capacity, meaning no locked-away portion of the battery you cannot use, backed by an Australian company
- Warranty: 10 years
Best for: homeowners after a more affordable entry point into battery storage, with the option to add more modules later as their budget or needs change.
Fronius Reserva
Fronius is a well-respected name in solar inverters. Its Reserva battery is built as a tower of stackable modules, designed to pair with Fronius’s own GEN24 inverters. One thing that sets it apart is how well it handles tougher outdoor conditions.
- Capacity: modular in roughly 3.15kWh steps, from about 6.3kWh up to 15.8kWh per tower, and able to be combined for more
- Standout feature: a high weatherproofing (IP65) and corrosion-resistance rating, well-suited to homes within a few hundred metres of the coast. This is a relevant point for many Perth suburbs
- Warranty: 10 years, with at least 70% capacity guaranteed at the end of the warranty period
Best for: coastal homes, or anyone who wants their battery in an outdoor or semi-exposed area without worrying about weather damage.
BYD Battery-Box Premium
BYD has been making home batteries for longer than most brands on this list. We pair the BYD Battery-Box Premium HVM with Fronius GEN24+ inverters. This gives you a proven, modular battery alongside one of the most trusted inverter brands on the market.
- Capacity: HVM models, modular from 8.3kWh to 22.1kWh
- Standout feature: a well-proven battery paired specifically with Fronius GEN24+ inverters, giving you a tested combination backed by two established manufacturers
- Warranty: 10 years, with 60% capacity guaranteed at the end of the warranty period
Best for: homeowners with, or installing, a Fronius GEN24+ inverter who want a well-proven, modular battery to go with it.
Tesla Powerwall 3
The Powerwall 3 is Tesla’s latest home battery. It is designed to be as simple as possible. The battery, inverter, and smart controls are all built into one wall-mounted unit. That makes installation more straightforward in many cases, and the Tesla app is well known for being easy to use.
- Capacity: 13.5kWh per unit, expandable by adding more units
- Standout feature: an everything-in-one-box design with a high power output, so it can run more of your home’s appliances at once during an outage
- Warranty: 10 years
Best for: homeowners who want a well-known brand, a simple all-in-one install, and reliable blackout backup, and who are comfortable paying a bit more for that simplicity.
How Rebates Change the Price
Every price above is before rebates, and rebates make a real difference. Two rebates stack for eligible Synergy customers. The federal Cheaper Home Batteries Program gives roughly $258 per usable kWh on the first 14 kWh of storage, with a lower rate above that. The WA Residential Battery Scheme adds around $130 per usable kWh, capped at $1,300, when you join the Synergy Battery Rewards VPP. Together, these take a meaningful amount off the installed price, and we confirm the exact figures on your quote.
Rebate amounts and eligibility rules can change, so the best way to know exactly what you will pay is to get a personalised quote. For a full breakdown of current rebates and how to qualify, see our WA Battery Rebates 2026 guide.
Which Battery Is Right for You?
With six good options, and new batteries launching all the time, it is easy to get stuck comparing spec sheets. But the right battery for your home depends on things a brand comparison cannot show you. This includes how your household uses power, what your switchboard and roof can support, whether an EV or other big change is coming, and how your existing solar system is set up.
Rather than pick a brand off a list, talk to us. At Positive Energy Solutions, we look at your home and your goals, then put together a battery solution specific to your needs. We match the right brand, size and inverter setup to you, rather than offer a one-size-fits-all recommendation.
It is also worth thinking about sizing for the future as well as today. Our Synergy DEBS and feed-in tariff guide explains why going slightly bigger now, especially with a battery, tends to pay off more than relying on grid export credits.
Why Choose Positive Energy Solutions
Choosing between brands can feel overwhelming, especially when every manufacturer claims to be the best. Our job is to cut through that noise and recommend what is actually right for your home. When you work with Positive Energy Solutions:
- We only stock proven, mid-to-premium brands: every brand we offer has a genuine Australian presence, real after-sales support, and a track record we trust. We do not install entry-level or unproven batteries, even if they cost less upfront.
- We are not tied to a single brand: we assess your home, usage and budget first, then recommend the battery that genuinely fits, not just the one we have the most of in stock.
- We check compatibility properly: if you already have solar, we confirm whether your existing inverter works with the battery you are considering, or whether an upgrade makes more sense.
- We factor in your future plans: an EV, a pool, or switching from gas can all change how big a battery makes sense. We talk through these with you before recommending a size.
- We handle rebates and paperwork: from federal and state rebates to network approvals, we make sure everything is applied for correctly.
- We are local: based in Perth and servicing the Synergy network area. Our advice reflects the conditions, rules and rebates that actually apply to your home.
Read more about how we design solar and battery systems for Perth homes.
Get Started
Still not sure which battery is right for you? That is completely normal. With six solid options, and more launching every year, it is a lot to weigh up on your own.
Talk to us to find out which battery suits you. At Positive Energy Solutions, we look at your home, your power usage, and your plans for the future. Then we put together a battery solution, and a clear price including rebates, tailored to your needs.
Get in touch with our team today to find out which solar battery makes the most sense for your home.
Related guides
- Best Solar Panels Perth 2026: What to Look For and What We Install
- Solar and Battery for High-Energy Perth Homes 2026: Pool, Air Conditioning and EV Sizing Guide
- Is LFP Battery Chemistry Right for Perth Homes? A Closer Look at the BYD Battery-Box Premium HVM
- Fronius GEN24 Plus and Reserva: Why the Inverter and Battery Work Best Together
Frequently Asked Questions
What is the best solar battery in Australia right now?
There is no single best battery for everyone. It depends on your budget, your existing solar system, and what you want the battery to do. SigEnergy SigenStor, Sungrow SBR/SBH, iStore, Fronius Reserva, BYD Battery-Box and Tesla Powerwall 3 are all well-regarded options. Each has different strengths around price, capacity, compatibility and weatherproofing.
How much does a home battery cost in Perth in 2026?
It depends on the brand and how much storage you choose. Rebates can make a big difference to the final price. Talk to us for a personalised quote based on your home and the current rebates available.
Do I need a new inverter to add a battery?
It depends on the battery and what inverter you already have. Some batteries, like Tesla Powerwall 3 and SigEnergy SigenStor, come with their own inverter built in. Others, like BYD, iStore, Sungrow SBR/SBH and Fronius Reserva, need a compatible inverter. For example, we pair the BYD Battery-Box Premium HVM with Fronius GEN24+ inverters. If your current inverter is on the approved list, you may be able to keep it. If not, you may need to upgrade.
Can I add a battery to my existing solar system?
In most cases, yes. Many households add a battery to solar panels that have been running for years. The main thing to check is whether your existing inverter works with the battery you want, or whether it makes sense to upgrade the inverter at the same time.
Is a bigger battery always better?
Not necessarily. But it is often worth sizing a little bigger than your current usage if you are planning changes like an electric car, switching from gas, or spending more time at home. A battery that is too small may leave you buying expensive grid power in the evenings. One sized with the future in mind can avoid a costly upgrade later.
What does a battery’s IP rating mean?
IP rating describes how well a product is sealed against dust and moisture. A higher rating, such as IP65, means a battery can be safely installed outdoors or in exposed areas, such as an alfresco or near the coast, without extra protection. Check this if you do not have space for the battery indoors or in a garage.
How do rebates affect which battery I should choose?
Rebates are generally based on the battery’s storage capacity, in kWh, rather than the brand. So they do not favour one brand over another directly. But because rebates reduce the price by a similar proportion across brands, a slightly larger battery can sometimes cost less per kWh after rebates than a smaller one. See our WA Battery Rebates 2026 guide for current rebate details.
About the Author
Jason Wiktorowicz
Sales Manager, Positive Energy Solutions | Perth, WA
Jason has been at the centre of Western Australia’s energy transition for over a decade. As Orchestration Lead on Project Symphony — WA’s largest virtual power plant pilot — and Stream Lead on Project Encore, he worked directly with AEMO, Western Power and Energy Policy WA to shape how distributed energy resources connect and operate on the SWIS. That work included developing and rolling out CSIP-AUS, now mandatory for all new WA grid connections. He also led Emergency Solar Management (ESM), the first program of its kind in WA, VPP for Schools (VPP4S), which provided direct market benefits through Supplementary Reserve Capacity, and REBAR, the WA Residential Battery Rebate scheme.
His earlier career spanned Synergy, Infinite Energy and Curtin University’s Sustainability Policy Institute, where he co-authored peer-reviewed research on net-zero urban precincts, solar integration and peer-to-peer energy trading, published in the journal Urban Planning in 2018.
At Positive Energy Solutions, Jason leads sales with a focus on system design accuracy and long-term performance. Positive Energy Solutions installs solar and battery systems, EV chargers and heat pumps, and holds partner accreditations with Fronius, SigEnergy, iStore and SunPower. Connect with him on LinkedIn.
