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AI-W5.1-B (6 modules) vs SigenStor BAT stack (3 modules) 6 of 16 identical Swap Change batteries

Deye AI-W5.1-B (6 modules) vs Sigenergy SigenStor BAT stack (3 modules)

AI-W5.1-B (6 modules)
27.6 kWh LFP LV
Open battery page Datasheet PDF
VS
Sigenergy SigenStor BAT stack (3 modules)
SigenStor BAT stack (3 modules)
24.18 kWh LFP
Open battery page Datasheet PDF
The verdict

10 differences, and they point both ways

The largest is usable energy: 3.42 kWh apart. 6 of 16 comparable parameters are identical, with 17 more left out because at least one datasheet does not publish them.

See all 10 differences
How alike are they
6 of 16 comparable
parameters are identical
identical differs not published
01

What actually differs

10 of 16 parameters
Parameter AI-W5.1-B (6 modules) SigenStor BAT stack (3 modules) Difference
Usable energy 27.60 kWh 24.18 kWh 3.42 kWh apart
Continuous discharge power 12.80 kW 12.00 kW 0.80 kW more power
Max system capacity 30.7 kWh 48.4 kWh 17.6 kWh more room to expand
Nominal energy 30.72 kWh 24.18 kWh 6.54 kWh apart
Continuous charge power 12.80 kW 12.00 kW 0.80 kW faster charging
Peak discharge power 18.43 kW 18.00 kW 0.43 kW more surge
Weight 339.5 kg 237.0 kg 102.5 kg lighter
Weight per kWh 12.3 kg/kWh 9.8 kg/kWh 2.5 kg/kWh lighter
Ingress protection IP65 (after stacking) IP66 IP65 (after stacking) vs IP66
Dimensions 1974x720x255 mm 1180x850x260 mm 1974x720x255 mm vs 1180x850x260 mm

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02

Full specification

Parameter AI-W5.1-B (6 modules) SigenStor BAT stack (3 modules) Difference
Capacity
Usable energy 27.60 kWh 24.18 kWh 3.42 kWh apart
Nominal energy 30.72 kWh 24.18 kWh 6.54 kWh apart
Depth of discharge 90 % - Not published by Sigenergy
Max system capacity 30.7 kWh 48.4 kWh +17.6 kWh for SigenStor BAT stack (3 modules)
Modules per stack 1-6 1-6 Same
Power
Continuous discharge power 12.80 kW 12.00 kW +0.80 kW for AI-W5.1-B (6 modules)
Continuous charge power 12.80 kW 12.00 kW +0.80 kW for AI-W5.1-B (6 modules)
Peak discharge power 18.43 kW 18.00 kW +0.43 kW for AI-W5.1-B (6 modules)
Power per kWh 0.46 kW/kWh 0.50 kW/kWh Effectively the same
Efficiency and lifetime
Round-trip efficiency - - Neither datasheet publishes this
Cycle life 6000 cycles - Not published by Sigenergy
Cycle test depth 90 % - Not published by Sigenergy
Capacity at end of life 70 % - Not published by Sigenergy
Self-discharge - - Neither datasheet publishes this
Electrical
Voltage class Low voltage - Not published by Sigenergy
Nominal voltage 51 V - Not published by Sigenergy
Operating voltage 43.2-57.6 V - Not published by Sigenergy
Cell chemistry LFP LFP Same
Active cell balancing - - Neither datasheet publishes this
Thermal management - - Neither datasheet publishes this
Built-in inverter
Inverter None (battery only) None (battery only) Same
Inverter power - - Neither datasheet publishes this
Grid connection - - Neither datasheet publishes this
Backup power - - Neither datasheet publishes this
Physical
Weight 339.5 kg 237.0 kg -102.5 kg for SigenStor BAT stack (3 modules)
Weight per kWh 12.3 kg/kWh 9.8 kg/kWh -2.5 kg/kWh for SigenStor BAT stack (3 modules)
Dimensions 1974x720x255 mm 1180x850x260 mm 1974x720x255 mm vs 1180x850x260 mm
Ingress protection IP65 (after stacking) IP66 IP65 (after stacking) vs IP66
Outdoor-rated - - Neither datasheet publishes this
Min operating temperature -20 °C -20 °C Same
Max operating temperature 55 °C 55 °C Same
Warranty
Warranty 10 yrs - Not published by Sigenergy
Warranted throughput 16.0 MWh - Not published by Sigenergy
03

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Sigenergy SigenStor BAT stack (3 modules) vs Deye BOS-G25 Pro
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04

Written summary

Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate.