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ECS2900-H3 vs SigenStor BAT stack (1 module) 4 of 12 identical Swap Change batteries

FoxESS ECS2900-H3 vs Sigenergy SigenStor BAT stack (1 module)

FoxESS ECS2900-H3
ECS2900-H3
7.78 kWh 95.0 % round-trip LFP HV
Open battery page Datasheet PDF
VS
Sigenergy SigenStor BAT stack (1 module)
SigenStor BAT stack (1 module)
8.06 kWh LFP
Open battery page Datasheet PDF
The verdict

SigenStor BAT stack (1 module) leads on the differences that matter

The largest is usable energy: 0.28 kWh apart. 4 of 12 comparable parameters are identical, with 21 more left out because at least one datasheet does not publish them.

See all 8 differences
How alike are they
4 of 12 comparable
parameters are identical
identical differs not published
01

What actually differs

8 of 12 parameters
Parameter ECS2900-H3 SigenStor BAT stack (1 module) Difference
Usable energy 7.78 kWh 8.06 kWh 0.28 kWh apart
Max system capacity 20.2 kWh 48.4 kWh 28.2 kWh more room to expand
Nominal energy 8.64 kWh 8.06 kWh 0.58 kWh apart
Weight 100.3 kg 91.0 kg 9.3 kg lighter
Weight per kWh 12.9 kg/kWh 11.3 kg/kWh 1.6 kg/kWh lighter
Ingress protection IP65 IP66 IP65 vs IP66
Modules per stack 2-7 1-6 2-7 vs 1-6
Dimensions 470x570x380 mm 640x850x260 mm 470x570x380 mm vs 640x850x260 mm

Shop prices by brand: See 21 FoxESS offers · See 15 Sigenergy offers

02

Full specification

Parameter ECS2900-H3 SigenStor BAT stack (1 module) Difference
Capacity
Usable energy 7.78 kWh 8.06 kWh 0.28 kWh apart
Nominal energy 8.64 kWh 8.06 kWh 0.58 kWh apart
Depth of discharge 90 % - Not published by Sigenergy
Max system capacity 20.2 kWh 48.4 kWh +28.2 kWh for SigenStor BAT stack (1 module)
Modules per stack 2-7 1-6 2-7 vs 1-6
Power
Continuous discharge power - 4.00 kW Not published by FoxESS
Continuous charge power - 4.00 kW Not published by FoxESS
Peak discharge power - 6.00 kW Not published by FoxESS
Power per kWh - 0.50 kW/kWh Not published by FoxESS
Efficiency and lifetime
Round-trip efficiency 95.0 % - Not published by Sigenergy
Cycle life 6000 cycles - Not published by Sigenergy
Cycle test depth 90 % - Not published by Sigenergy
Capacity at end of life - - Neither datasheet publishes this
Self-discharge - - Neither datasheet publishes this
Electrical
Voltage class High voltage - Not published by Sigenergy
Nominal voltage 173 V - Not published by Sigenergy
Operating voltage 145.8-197.1 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 100.3 kg 91.0 kg -9.3 kg for SigenStor BAT stack (1 module)
Weight per kWh 12.9 kg/kWh 11.3 kg/kWh -1.6 kg/kWh for SigenStor BAT stack (1 module)
Dimensions 470x570x380 mm 640x850x260 mm 470x570x380 mm vs 640x850x260 mm
Ingress protection IP65 IP66 IP65 vs IP66
Outdoor-rated Yes - Not published by Sigenergy
Min operating temperature -20 °C -20 °C Same
Max operating temperature 55 °C 55 °C Same
Warranty
Warranty - - Neither datasheet publishes this
Warranted throughput - - Neither datasheet publishes this
03

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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.