The AlphaESS 13.3kWh battery is the SMILE-BAT-13.3P module that pairs with the SMILE5 5 kW hybrid inverter, and it suits households that want a modular, mid-priced battery with local support. It is less suited to homes that need to run large loads at once, because the inverter tops out at 5 kW.
This guide covers what the system is, what its price context looks like, how rebate timing changes the numbers, what the warranty really limits and who it suits. If you are comparing quotes from solar battery installers in Adelaide and Sydney, use it as a checklist. Every figure is attributed and dated where the source dates it, and anything illustrative is labelled.
Key takeaways
- The datasheet lists 13.3 kWh usable at 100 percent depth of discharge, and the Clean Energy Council listing, as shown by Why Solar, gives usable capacity of 13.34 kWh.
- Solar Choice’s February 2026 SMILE5 bands are $12,000 to $13,000 for 11 kWh and $15,000 to $17,500 for 16.5 kWh, installed and before rebates. It publishes no band for 13.3 kWh.
- The Clean Energy Regulator’s STC factor falls from 6.8 (May to December 2026) to 5.7 from January 2027, so the same battery earns fewer STCs.
- The performance warranty ends at 120 months or 3.12 MWh per kWh of usable capacity, whichever is earlier, per AlphaESS Australia.
- Solar Choice says the 5 kW inverter may be undersized for off-grid or larger solar systems.
What is the AlphaESS 13.3kWh battery?
A 13.3kWh AlphaESS battery is one SMILE-BAT-13.3P lithium iron phosphate module. The datasheet hosted by SolarQuotes lists 13.3 kWh nominal and 13.3 kWh usable at 100 percent depth of discharge, a 48 V module, 100 A maximum charge and discharge current, 8,000 cycles under specific test conditions and an operating range of -10 to 50 °C. Energy Matters gives depth of discharge as 95 to 100 percent, so confirm the usable figure on your quote.
It works with the SMILE5 inverter, a 5 kW hybrid unit rated IP65 with 5,000 VA of backup output and UPS capability, according to the datasheet. Energy Matters says modules can be paralleled, up to six, for as much as 80 kWh depending on configuration. AlphaESS also sells a newer SMILE-G3 family listed in the same warranty document, so ask which model is on your quote and check that model’s own datasheet and listing.
On the rebate side, Why Solar’s Clean Energy Council checker shows the SMILE-BAT-13.3P as approved on 24 August 2023 and listed until 24 February 2027, with usable capacity of 13.34 kWh (page updated 24 August 2026). The Clean Energy Council says its lists are dynamic and products can be suspended or de-listed at any time, so check the live list before you sign.
How much does an AlphaESS 13.3kWh battery cost?
Solar Choice, in a review last updated on 24 February 2026, puts the average installed cost of AlphaESS SMILE5 systems at $1,025 per usable kWh, including GST and before rebates, which it calls mid-range. Its bands are $8,500 to $9,000 for 5.5 kWh, $12,000 to $13,000 for 11 kWh and $15,000 to $17,500 for 16.5 kWh. It does not publish a band for 13.3 kWh, so treat any single figure for this size as a quote to verify, not a published price.
Older numbers are out of date. One Step Off The Grid reported the Smile 5 launching in November 2020 at just under $10,000 installed. Compare like for like: the same inverter, the same scope of installation, GST included and the rebate shown as its own line. For wider pricing, see our guide to solar battery cost in Australia.
Price check: where does your quote sit?
Blue bars: Solar Choice price bands. Dashed green: $1,025 per usable kWh average.
Source: Solar Choice AlphaESS review, last updated 24 February 2026, installed prices including GST and before rebates for SMILE5 systems. Your quote may differ in scope, so check it matches.
How does rebate timing change the AlphaESS 13.3kWh battery price?
The Clean Energy Regulator says STCs are calculated on the usable capacity of the battery, using a factor that steps down over time: 6.8 for May to December 2026, 5.7 for January to June 2027 and 5.2 for July to December 2027. It also tapers by size: 100 percent of the factor for the first 14 kWh, 60 percent from 14 to 28 kWh and 15 percent from 28 to 50 kWh. A 13.3 kWh module sits inside the full-value tier.
The regulator says the factor is set so the discount equates to around 30 percent of the upfront cost, which is a target and not a guaranteed amount, and a registered agent can give the discount upfront if you assign your STC rights. Check your Cheaper Home Batteries Program eligibility before you sign.
STC bubbles: how the count shrinks by period
Method: STC factor from the Clean Energy Regulator multiplied by usable kWh, with its size tapering. Indicative counts only. STC dollar values vary, so use the REC Registry calculator for a figure.
What does the AlphaESS 13.3kWh battery warranty really limit?
AlphaESS Australia’s warranty conditions give a 5-year product warranty and a 10-year battery performance warranty. The performance warranty runs for 120 months or until throughput reaches 3.12 MWh per kWh of usable capacity, whichever is earlier. Because that limit scales with size, it equals about 3,120 full cycles, or roughly 8.5 years at one full cycle a day. Solar Choice quotes the same limit plus 70 percent usable capacity retained after 10 years, calls it one of the better warranties for Australian customers and scores it 2.5 out of 5.
Read the conditions. The document requires installation by a CEC-approved installer, not in direct sunlight, an operating ambient of -10 to 50 °C, and an internet connection: an outage of 30 days, or 90 days cumulative, cuts the warranty to 3 years. Claims must be made within 4 weeks of knowing about a fault. A 10-year extended product warranty is available if bought within 30 days of installation. The document shows no revision date, so ask your installer for the current version.
Throughput burn-down: how fast does the limit arrive?
Method: years to the limit equal 3,120 divided by full cycles a day and 365. The 3.12 MWh per kWh limit is from AlphaESS Australia’s warranty conditions. Cycle rates are illustrative.
How does the AlphaESS 13.3kWh battery handle blackouts and heat?
The datasheet lists 5,000 VA of backup output with UPS capability. Energy Matters says standard backup typically covers essential circuits only and depends on the installation design and phase configuration, so ask which circuits will run and whether your biggest appliance will start. Our guide to home battery backup in a blackout lists the questions to ask.
The warranty excludes installations exposed to direct sunlight, and the operating range tops out at 50 °C. In an Adelaide or Sydney summer, choose a shaded, ventilated wall, and read our Adelaide battery heat and placement guide first.
Who does the AlphaESS 13.3kWh battery suit?
Solar Choice’s review points to mid-budget households that want a modular battery with local support, whether adding to existing solar by AC coupling or building new solar and a battery together with DC coupling. It lists Australian office support and compatibility with several VPP networks as strengths. Its listed drawbacks are a 5 kW inverter that may be undersized for off-grid or larger solar systems, mixed installer feedback on technical support and an app that does not control when the battery charges or discharges.
Use the fit meter to test your own situation, then compare the system against others on the six specs in our guide to the best home solar battery specs.
Fit meter: switch on what applies to you
Probably notCheck carefullyWorth a quoteGood fit
Illustrative weighting built from the Solar Choice review, Energy Matters and AlphaESS Australia’s warranty conditions. It is a prompt for questions, not a rating of the product.
How Solar Choice scores AlphaESS batteries: tap a row
Solar Choice scores company backing 5 out of 5, noting Australian operations since 2015 and local support from an Australian office.
Solar Choice scores functionality 5 out of 5. It lists a modular, stackable design, backup without extra components and compatibility with several VPP networks.
Solar Choice scores the warranty 2.5 out of 5 but calls it one of the better battery warranties for Australian customers, with 70 percent usable capacity after 10 years or 3.12 MWh per kWh.
Solar Choice scores customer reviews 3 out of 5 and notes mixed installer feedback on technical support during installations.
Solar Choice’s overall score for AlphaESS batteries is 3.9 out of 5, in a review last updated on 24 February 2026.
Source: Solar Choice AlphaESS review, last updated 24 February 2026. Scores are out of 5 and cover AlphaESS batteries in general, not only the 13.3 kWh module.
Frequently asked questions
How much usable capacity does the AlphaESS 13.3kWh battery have?
The datasheet hosted by SolarQuotes lists 13.3 kWh nominal and 13.3 kWh usable at 100 percent depth of discharge. Why Solar’s Clean Energy Council checker lists usable capacity of 13.34 kWh, and Energy Matters gives depth of discharge as 95 to 100 percent. Confirm the usable figure written on your quote.
How much does an AlphaESS 13.3kWh battery cost installed?
Solar Choice does not publish a band for 13.3 kWh. Its February 2026 SMILE5 bands are $12,000 to $13,000 for 11 kWh and $15,000 to $17,500 for 16.5 kWh, installed, including GST and before rebates, with an average of $1,025 per usable kWh. Get a written quote that shows the rebate as a separate line.
What warranty does the AlphaESS 13.3kWh battery have?
AlphaESS Australia’s conditions give a 5-year product warranty and a 10-year battery performance warranty. Performance cover ends at 120 months or 3.12 MWh of throughput per kWh of usable capacity, whichever is earlier. A 10-year extended product warranty is available if bought within 30 days of installation, and internet connection conditions apply.
Is the AlphaESS 13.3kWh battery eligible for the Cheaper Home Batteries Program?
Why Solar’s Clean Energy Council checker shows the SMILE-BAT-13.3P as approved, listed until 24 February 2027. Eligibility also needs an accredited installer with a battery endorsement and, for grid-connected systems, VPP capability, according to the Clean Energy Regulator. Check the live Clean Energy Council list before you sign.
Can the AlphaESS 13.3kWh battery back up my whole home?
The datasheet lists 5,000 VA of backup output with UPS capability. Energy Matters says standard backup typically covers essential circuits only and depends on the installation design and phase configuration. Ask your installer which circuits will run, and whether your largest appliance will start, before you rely on it for a whole home.
Can I add the AlphaESS 13.3kWh battery to existing solar?
Yes. Solar Choice says the system can be AC-coupled to existing solar or DC-coupled in new systems, and notes a loss of about 3 to 4 percent when AC-coupled. Energy Matters gives the same 3 to 4 percent figure for AC-coupled retrofits. Your installer should confirm which option suits your inverter and switchboard.
Check an AlphaESS quote with UR Local Solar
If you have a quote for an AlphaESS 13.3kWh battery, bring it with a recent power bill and we will check usable capacity, inverter size, backup circuits and rebate timing against your usage, with service teams in Adelaide and Sydney. Book an appointment when you are ready.
Sources
- Solar Choice: Alpha ESS battery review
- Energy Matters: AlphaESS SMILE5 review
- AlphaESS: SMILE5 datasheet (hosted by SolarQuotes)
- AlphaESS Australia: Warranty conditions, residential series
- Why Solar: AlphaESS SMILE-BAT-13.3P CEC approval status
- Clean Energy Council: Approved batteries
- Clean Energy Regulator: Batteries guidance for households
- One Step Off The Grid: Alpha ESS launches 13.3kWh battery (2020)
