Battery · Alpha ESS

Alpha ESS SMILE-B3-PLUS SMILE-B3-PLUS (AS4777-2 2020)

CEC approved · Aug 2025

Usable capacity: 4.79 kWh
Nominal capacity: 5.04 kWh
Continuous power: 3 kW
Peak power: 3 kW

Value score

58/100

Good value

Solid specifications — a good choice for most homes.

Usable capacity (DOD)13/15

95% DOD - Excellent usable capacity

Warranty & terms7/20

5yr | 70% retention - Limited warranty coverage

Round-trip efficiency13/15

95% efficiency - Excellent

Cycle life12/15

6,000 cycles - Excellent longevity

Capacity & power

Usable capacityⓘ: 4.79 kWh
Nominal capacity: 5.04 kWh
Continuous power: 3 kW
Peak power: 3 kW

Warranty

Warranty period: 5 yrs

Chemistry & performance

Cycle life: 6000 cycles
Round-trip efficiencyⓘ: 95%
Depth of discharge: 95%

Capabilities

VPP ready: Yes
Backup capable: Yes
Expandable: Yes

Documents & provenance

Datasheet: PDF
Warranty document: PDF
Specs verified: Verified 2026-05-28

Documents

Specs verified 2026-05-28

Considering this battery?

Degradation3/10

3%/year degradation - Moderate capacity loss (exceeds mid-range tier max of 2.5%/yr)

Value for money5/10

Price per kWh not available

Heat tolerance (Perth)5/15

Temperature specs not available — scored conservatively for Perth climate

What this means

Warranty throughput not specified - check terms before purchase
5yr warranty below mid-range tier standard of 10yr
Degradation rate not specified — scored conservatively
No temperature data available — critical for Perth garage installations (40-50°C in summer)

Scored independently from manufacturer datasheets and the CEC register across usable capacity, warranty, efficiency, cycle life, degradation, value and heat tolerance. Missing specs are scored conservatively, never assumed.

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About Alpha ESS

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