10kWh Solar Batteries: Price, Size & Is It Right for You?
Are you thinking about installing a solar battery?
The most important considerations you need to have when buying a solar battery:
- Size
Inverter Compatibility
Depth of Discharge
Warranty
CEC Approval Status
Ingress Protection
Battery Chemistry: LifePo4 or NMC (most say Lithium-ion, not all will say the rest of the story)
Price
Today we’ll be talking about solar battery size.
Mainly, whether one of Australia’s most common standard solar battery sizes - 10KW - is just what your PV system needs.
What is a 10kw solar system?
A 10kw solar system is a photovoltaic arrangement with the power capability of 10 kilowatts of power in prime conditions. The 10kw here refers to the solar panels in the setup and not the inverter.
10kw is a popular larger solar system for households that have high energy needs or want to plan for the future where they might use EVs or want a solar battery. These systems often generate 38-44kWh a day. If your energy needs are generally lower, you might want to consider a 6.6kW instead.
A ‘10kw solar system’ does not necessarily include a battery.
Home solar storage is an add on for pv systems. If you want a sizable pv solar system that is capable of both producing and storing energy, you should try asking for a ‘10kw solar system with battery’.
What is a 10kW solar battery?
10kWh is a large storage capacity solar battery. What it technically means is 10 kilowatt-hours (kWh) of storage for electricity generated through your pv system. You can also charge your solar battery on off-peak main-grid electricity to supplement your storage and savings.Typically, 10kWh solar batteries offer higher continuous discharge rates - often around 5kW - compared to many lower-capacity batteries, which are commonly limited to around 3kW. This higher discharge rate is particularly beneficial for homes running heavier electrical appliances such as electric hot water systems, air conditioning, electric ovens or stovetops, and pool pumps, as it allows the battery to supply these loads more comfortably without drawing additional power from the grid.
Are solar batteries measured in kW or kWh?
You’ll often see people search for a “10kW solar battery”, but batteries are actually measured in kilowatt-hours (kWh), not kilowatts (kW). A “10kW battery” almost always refers to a 10kWh solar battery, which describes how much energy the battery can store.
Do you actually get the full 10kw of solar storage in a 10kw solar battery?
The short answer (most of the time) is no.
Four things affect what you are actually getting through your 10kwh battery is:
Depth of Discharge (DoD)
The depth of discharge of a battery is just how much of the energy stored can be discharged and used. This score is usually presented as a percentage.
Some of the most common Depth of Discharge scores for a 10kWh solar battery are:
- 95%
- a 95% DoD 10kw solar battery gives you 9.5kWh in each cycle.
- 96%
- a 96% DoD for a 10kW solar battery will give you 9.6kWh in each cycle (often the standard for LifePO4 batteries, or other lithium-ion batteries)
- 100%
- 100% DoD will give you the full 10kwh in each cycle. This is less common, but is possible and a potential benefit to some homeowners. However, even in 100% DoD 10kw solar batteries, it is usually recommended to leave 10-20% in reserve for optimal lifespan.
Round-Trip Efficiency (RTE)
On top of a battery’s depth of discharge, there is also a small conversion loss of about ~10-20% between solar to battery to home.
AC coupled solar battery systems are slightly less efficient because this will require AC → DC and then DC → AC for your home solar and battery system. However, it still is the smarter choice overall if you’re retrofitting a battery onto an existing solar system.
Some solar battery manufacturers will also disclose a ‘round-trip efficiency’ score to give a better idea of how efficient they are in retaining energy through these conversions.
How much you care about your battery’s lifespan (and your warranty)
If you are regularly emptying out the full usable stored energy of your battery-or DoD in other words-you are usually putting a lot of stress on the battery that reduces its lifespan.
Some solar battery manufacturers will have a warranty that specifies a maximum recommended depth of discharge to stick to, otherwise you may void or reduce your warranty. This means even in systems with a higher DoD, you may want to leave 10-20% in reserve.
Blackout Protection
If you decide to opt in for enabled blackout protection for your solar battery, you will usually get the recommendation to have 10-20% of your battery capacity in reserve. This is so there is actually energy to power your house in the case of any blackouts.
Do you need a 10kw solar battery for a 10kw solar system?
No, not necessarily.
The goal here isn’t to match the number of wattage in your solar battery to your pv system. You actually want to have some extra energy storage to cushion against any losses, increase your usable capacity, and be able to comfortably use your battery storage to isolate your exposure to peak time demands.
For a 6.6kw pv system (roughly generating 17-21kWh per day), 10kwh of solar storage or higher is often ideal.
This gives you a good amount to cover the heating/cooling, electric vehicles and small business power demands. A 6.6kW solar system can fully charge a 10kWh battery in about 3-5 hours in strong midday sun.
For a 10kw pv system, a 13.5kWh - 16kWh battery is usually a more recommended match.
Learn more: 10kw Solar Systems
Is a 6.6kW solar system with 10kW solar battery right for me?
6.6kW solar system + 10kWh solar battery provides a great fit for most small to medium Australian homes.
This is often a recommendation for:
2-3 people households
High daytime energy users
When a 10kW solar system with a 12 - 16kw solar battery will be a better fit
For high energy users, a 10kW pv system + 12-16kWh solar battery works best.
Examples of high energy users:
Electric car (recommended: 13.3kW solar battery)
Electric water heater system
Have a pool (pool pump)
Air conditioning and heating system
You may also want to consider a system designed for higher energy usage depending on your future plans:
Plans to start a family or have more kids
Add a swimming pool
Plan to buy an electric vehicle
Comparing different 10kWh solar battery options
As Australia’s largest solar battery provider Solar Battery Group offers a great range of solar batteries, heavily vetted to deliver the best solutions for our customers.
Alpha Smile G3-B5 (10.1 kWh)
| Category / Feature | Alpha Smile G3-B5 |
| Core Characteristics | |
Battery Chemistry |
LFP (Lithium Iron Phosphate) |
Capacity |
10.1 – 60.5 kWh |
Depth of Discharge |
95% |
Modular |
Yes – 10.1 kWh modules, up to 6 in parallel |
| System Design | |
Built-in Inverter |
Yes – Built-in single-phase AC inverter |
AC Coupling |
Yes |
DC Coupling |
No |
Inverter Compatibility |
Integrated inverter (no external inverter required) |
| Protection and Resilience | |
Blackout Protection |
Yes – UPS backup with <10 ms switchover for critical loads |
IP Rating |
IP65 (Outdoor) / IP21 (Indoor) |
| Ownership Features | |
VPP Capable |
Yes |
Warranty |
5-year product warranty, 10-year battery warranty (Munich Re backed) |
Learn more about the 10 kWh Alpha Smile G3-B5
Alpha Smile 5 (10.1 kWh)
| Category / Feature | Alpha Smile 5 (10.1 kWh) |
| Core Characteristics | |
Battery Chemistry |
LFP (LiFePO₄) |
Capacity |
9.7 kWh usable (10.1 kWh nominal) |
Depth of Discharge |
96% |
Modular |
Yes – expandable up to 6 × 10.1 kWh modules (≈ 60.6 kWh max) |
| System Design | |
Built-in Inverter |
Yes – Smile5-INV single-phase hybrid inverter |
AC Coupling |
Yes |
DC Coupling |
Yes – direct PV input via dual MPPTs |
Inverter Compatibility |
Integrated inverter (Smile5-INV) |
| Protection and Resilience | |
Blackout Protection |
Yes – UPS backup mode |
IP Rating |
IP65 (Outdoor) / IP21 (Indoor) |
| Ownership Features | |
VPP Capable |
Not specified |
Warranty |
5-year product warranty, 10-year battery performance warranty |
Learn more about the 10 kWh Alpha Smile 5AlphaESS is an award winning energy storage company and brand, having been honoured with recognition from SunWiz, EUPD Research, IHS Markit, Red Dot Design, iF Design, Tier 1 Energy Storage Manufacturer and more. Their flagship product series, the SMILE series, offers some of the
best 10kw solar batteries for price in Australia
.
Solar Battery Group also offers the Tesla Powerwall 3, one of the most renowned options for its smart features, high performance and seamless integrations. The lowest storage capacity available offers a moderate amount over 10kW with 13.5 kWh, but can be expanded up to 54 kWh with expansion units through primary extensions.
We also offer other 10kWh solar battery options through Eveready, Ambrion, and Growatt. If you would like to compare your options based on your home’s energy needs, don’t hesitate to give us a call on 1300 233 224 or request a call back.
How much does a 10 kW solar battery cost in Australia?
For most households, a good-quality ~10 kWh home battery installed typically lands in the ~$11,000–$14,000 range (incl. GST) for a straightforward install before stacking multiple incentives, like the National Battery Rebate, and without major electrical upgrades.Your final quote moves mainly based on whether you’re retrofitting
(adding a battery to an existing solar system) and whether you need backup hardware / switchboard work.
A useful way to sanity-check quotes is to separate the price into two common scenarios:
1) Battery-only (you’re already “battery-ready”)
If you already have (or are installing) a compatible inverter/charger setup, the cost is often closer to the battery-only installed range.
2) Battery + inverter/charger (retrofit complexity)
If you’re adding a battery to an older solar system that wasn’t designed for storage, you may need an additional battery inverter/charger
(or equivalent integration hardware), which raises the installed cost.
Prices for solar batteries vary by brand, features, and site complexity, but these “ballpark” ranges help set expectations:
- Smaller batteries (5 kWh) often cost more per kWh because fixed install and compliance costs are spread across fewer kWh.
- Mid-size (10–15 kWh) tends to be better value per kWh for many homes.
How much is a 10kw solar battery after the National Battery Rebate?
Before the National Battery Rebate, a 10kWh solar battery would have cost around $11,000 - $14,000.
Now, the same battery capacity attracts a rebate of roughly $3,000 - $4,000.
This means a 10kW solar battery is now in the price range of $7,000 - $11,000 for most Australians.
This is a rule of thumb. The STC value, amount of time from 2030, your location, solar battery product, additional electrical equipment and labour costs can also add in more variation.
We explain more about these factors below.
Why 10 kWh battery quotes vary so much
When two quotes both say “10 kWh battery,” the inclusions can be very different. The biggest price drivers are:Battery model + build quality
Most modern home batteries are LFP
(Lithium Iron Phosphate) because it’s valued for safety and cycle life. Better warranties, higher-rated components, and stronger support networks can cost more upfront.
Backup capability (blackout protection)
If you want whole-home or partial-home backup, you may need extra gear (e.g., gateways, contactors, critical-loads board) and more labour. Some systems include backup features; others require add-ons.
Retrofit vs new build integration
Retrofitting can require extra hardware and labour compared with installing battery + solar together (or installing a battery-ready inverter from day one).
Switchboard and compliance upgrades
Older switchboards, limited space, or required protection upgrades can add meaningful cost (sometimes the difference between a “standard” and “complex” install).
Location and installer access
Metro competition can reduce pricing pressure; regional/remote installs may have higher labour/travel costs.
Is a 10kWh solar battery worth it for my energy use?
A solar system + battery can save households around $2,000 - $2,800 per year. Over 10 years, this amount can add up to an extra $20,000 - $28,000 in total savings.
Learn more: How much can you really save with a solar battery?10kWh solar battery is usually paired with a 6.6 kW system, or for anticipated 6-13 kWh daily energy use.
Whether it’s worth it over all for you is going to be based on some factors:
- Your time of use
Do you use a lot of power in the evening or at night? A solar battery helps shift generated power to cover high night energy use.
- High time of use tariffs
Do high time of use tariffs really impact your savings? With lots of solar panels around the country, high demand usually comes when the sun goes down. Typically 3-9pm. It can mean that you’re not saving just as much anymore with just solar panels alone.
- Lower solar feed-in tariffs
If you have a solar pv system installed, find feed-in tariffs are going down and most of your energy use isn’t concentrated between 10am and 3pm, a solar battery will help you improve your energy self-consumption.
For many parts of the country, solar self-consumption is now the best way to save.
- Frequent blackouts in your area
If you live in a suburb or neighbourhood with higher amounts of blackouts, or less energy reliability, a solar battery with black out protection will keep your power going when you can’t rely on the grid.
- You’re eligible for lots of stacked incentives
With new solar incentives like the Cheaper Home Battery Program and interest free loans, it’s become easier than ever before to install solar batteries. The government is promoting solar investment to help the country push towards the goal of net zero carbon emissions. It’s also about improving access to energy.
It’s allowing much more Australians to invest into a solar battery, especially in bigger sizes, for about the same price of smaller installations. It lets households have more storage for future-proofing. But get too big of a solar battery, and you’ll never fill it.
Check your eligibility and get a battery size recommendation, join the National Battery Rebate queue.
You can get a 5kWh solar battery for $2,880. The lowest price once Government rebates are applied. 5kW is generally sufficient for small homes with modest energy use, and can be a great solution to buffer against high time of use tariffs.
For a long time, 10 - 13kWh has been the average starter solar battery for many homes across Australia. This is around what most families need for overnight and evening use.
Because solar panels power much of a home’s daytime energy use, batteries are typically sized to cover evening, overnight and low-solar periods rather than total daily consumption.
After the Cheaper Home Batteries Program, 20kWh is the new anticipated average solar battery size in Australia. A 20kWh battery gives people more capacity to cover more low-light timing and conditions like cloudy days, as well as to better handle high energy use appliances like air conditioning, EV charging, heat pumps and pool pumps.
ABC News reported that the Australian Energy Regulator says a typical home uses between 15kWh and 20kWh a day, across both daytime and night-time use.
How Long Is the Payback Period for a 10kW Solar Battery?
If you’re thinking about battery storage, this question almost always comes up early: “How long before it pays for itself?”It’s a fair question, and an important one.
The payback period is simply the time it takes for the savings on your electricity bills, plus any extra income from things like Virtual Power Plants (VPPs), to add up to what you paid for the battery in the first place. After that point, the battery is effectively working in your favour.
For a 10kWh solar battery, there isn’t one universal answer. Payback depends on where you live, how much electricity your household uses after the sun goes down, and which rebates or incentives you’re eligible for.
To safeguard your investment and estimated payback period, we also recommend looking for a 10kWh solar battery with a 10 year performance warranty.
This gives you peace of mind for long-lasting performance.
Ready to Secure a 10kW Solar Battery?
A great solar battery deserves a great installation. Solar Battery Group is one of the nation’s largest solar battery installers. We carry over 26,000 battery installations completed nationwide, more than 30 years in the industry to our name, and everyone of our installer team is CEC or SAA accredited.Whether you’re looking for a new 10kwh solar battery to retrofit onto an existing system, add to your current storage, or a complete solar system and battery package, we’re able to assist you.
