Alpha ESSSMILE-G3-B5
The Alpha ESS SMILE-G3-B5 is a home battery with usable capacity 3.8 kWh, charge power (continuous) 5 kW and cell chemistry LFP.1
Key figures
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SEAI home battery grant
UnknownA €600 grant for home battery storage systems was announced on 29 September 2026 and opens from 6 October 2026, subject to final implementation arrangements. Check SEAI for the detailed conditions before applying.
Technical specifications
| General | |
|---|---|
| Cell chemistry | LFP1 |
| Wi-Fi / app | Yes1 |
| Performance | |
| Usable capacity | 3.8 kWh1 |
| Nominal capacity | 4 kWh1 |
| Smallest configuration | 4 kWh1 |
| Expandable up to | 38.4 kWh1 |
| Charge power (continuous) | 5 kW1 |
| Discharge power (continuous) | 5 kW1 |
| Efficiency | |
| Depth of discharge | 95 %1 |
| Electrical | |
| Coupling | AC-coupled1 |
| Backup power | Yes1 |
| Off-grid capable | Yes1 |
| Dimensions & weight | |
| IP rating | IP651 |
| Warranty & lifespan | |
| Warranty | 10 years1 |
Manufacturer documentation
- Product page
- Datasheet / specifications — Alpha ESS SMILE-G3-S3.6 / S5 / B5 Datasheet – V01.13122024
External links to Alpha ESS's official website. The manufacturer may change or move documents; where they differ, the manufacturer's latest version applies.
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Frequently asked questions
What is the usable capacity of the Alpha ESS SMILE-G3-B5?
The usable capacity of the Alpha ESS SMILE-G3-B5 is 3.8 kWh.1
What is the charge power (continuous) of the Alpha ESS SMILE-G3-B5?
The charge power (continuous) of the Alpha ESS SMILE-G3-B5 is 5 kW.1
Which cell chemistry does the Alpha ESS SMILE-G3-B5 use?
The cell chemistry of the Alpha ESS SMILE-G3-B5 is LFP.1
What is the warranty of the Alpha ESS SMILE-G3-B5?
The warranty of the Alpha ESS SMILE-G3-B5 is 10 years.1
Sources
- Alpha ESS SMILE-G3-S3.6 / S5 / B5 Datasheet, V01.13122024 — Alpha ESS Co., Ltd. · accessed 29 Sept 2026
- SEAI home battery grant — Sustainable Energy Authority of Ireland (SEAI)