Home batteries

Alpha ESS SMILE-S5 / B5

Name: Alpha ESS SMILE-S5 / B5
Brand: Alpha ESS

4.788–28.728 kWh usable · best for daily cycling, with a warranty that lasts the full term

8.1Very good#12 of 28 battery series we rank · EnergyUpgrade Score out of 10

Why it scores 8.1.

Each part comes from the datasheet with a published rule; anything not stated scores zero.

Warranty that lasts
10.0 · 30%
Battery warranties end at 10 years or when a set amount of energy has passed through, whichever comes first. This is how many years the warranty covers for a typical home, which cycles its battery about 300 times a year.
Rule: Years of performance warranty at 300 full cycles a year, from the manufacturer's Australian warranty document: 6 years scores 0, the full 10 years or more scores 10.
Weather sealing
9.0 · 25%
Outdoor-rated batteries can go on any wall, including in the weather.
Rule: IP66 or better scores 10, IP65 9, IP55 6, IP54 4, lower 0.
Room to grow
6.2 · 25%
Start with what you need and add modules later, for an EV or electric heating.
Rule: Largest approved configuration, usable kWh: 10 scores 0, 40 or more scores 10.
Heat tolerance
6.7 · 20%
Batteries in garages and on west walls get hot. Higher operating limits mean less throttling.
Rule: Highest operating temperature: 40°C scores 0, 55°C or more scores 10.

12 approved models · Australian datasheet

Usable capacity: 4.788–28.728 kWh usable
Per module: 10.08 kWh
Performance warranty: 10 years, 70% capacity retained
Warranted throughput: 3,120 kWh per kWh of usable capacity
Warranty at 300 cycles a year: 10.0 years
Cycle life (datasheet, not scored): 6,000
Depth of discharge: 95%
Chemistry: LFP
IP rating: IP65
Highest operating temperature: 50°C
Expansion: 1 ~ 5 SMILE-BAT-5P in parallel; capacity range 5.04 ~ 30.24 kWh (95% DoD)
Warranty (as printed): 10 Years Product Warranty, 10 Years Battery Performance Warranty
Weight: 113 kg