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ECS2900-H7 vs GB-SL-EU (5 modules in series) 7 of 18 identical Swap Change batteries

FoxESS ECS2900-H7 vs Deye GB-SL-EU (5 modules in series)

FoxESS ECS2900-H7
ECS2900-H7
18.14 kWh 95.0 % round-trip LFP HV
Open battery page Datasheet PDF
VS
Deye GB-SL-EU (5 modules in series)
GB-SL-EU (5 modules in series)
18.4 kWh LFP HV
Open battery page Datasheet PDF
The verdict

11 differences, and they point both ways

The largest is usable energy: 0.26 kWh apart. 7 of 18 comparable parameters are identical, with 15 more left out because at least one datasheet does not publish them.

See all 11 differences
How alike are they
7 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

11 of 18 parameters
Parameter ECS2900-H7 GB-SL-EU (5 modules in series) Difference
Usable energy 18.14 kWh 18.40 kWh 0.26 kWh apart
Max system capacity 20.2 kWh 24.5 kWh 4.4 kWh more room to expand
Nominal energy 20.16 kWh 20.45 kWh 0.29 kWh apart
Nominal voltage 403 V 512 V 109 V apart
Weight 228.3 kg 254.0 kg 25.7 kg lighter
Weight per kWh 12.6 kg/kWh 13.8 kg/kWh 1.2 kg/kWh lighter
Max operating temperature 55 °C 60 °C 5 °C more heat tolerant
Inverter None (battery only) Built in (all-in-one) None (battery only) vs Built in (all-in-one)
Modules per stack 2-7 2-6 2-7 vs 2-6
Operating voltage 340.2-459.9 V 179.2-691.2 V 340.2-459.9 V vs 179.2-691.2 V
Dimensions 950x570x380 mm 1760x540x385 mm 950x570x380 mm vs 1760x540x385 mm

Shop prices by brand: See 21 FoxESS offers · See 44 Deye offers

02

Full specification

Parameter ECS2900-H7 GB-SL-EU (5 modules in series) Difference
Capacity
Usable energy 18.14 kWh 18.40 kWh 0.26 kWh apart
Nominal energy 20.16 kWh 20.45 kWh 0.29 kWh apart
Depth of discharge 90 % 90 % Same
Max system capacity 20.2 kWh 24.5 kWh +4.4 kWh for GB-SL-EU (5 modules in series)
Modules per stack 2-7 2-6 2-7 vs 2-6
Power
Continuous discharge power - - Neither datasheet publishes this
Continuous charge power - - Neither datasheet publishes this
Peak discharge power - - Neither datasheet publishes this
Power per kWh - - Neither datasheet publishes this
Efficiency and lifetime
Round-trip efficiency 95.0 % - Not published by Deye
Cycle life 6000 cycles 6000 cycles Same
Cycle test depth 90 % 90 % Same
Capacity at end of life - 70 % Not published by FoxESS
Self-discharge - - Neither datasheet publishes this
Electrical
Voltage class High voltage High voltage Same
Nominal voltage 403 V 512 V 109 V apart
Operating voltage 340.2-459.9 V 179.2-691.2 V 340.2-459.9 V vs 179.2-691.2 V
Cell chemistry LFP LFP Same
Active cell balancing - - Neither datasheet publishes this
Thermal management - Yes Not published by FoxESS
Built-in inverter
Inverter None (battery only) Built in (all-in-one) None (battery only) vs Built in (all-in-one)
Inverter power - - Neither datasheet publishes this
Grid connection - 3-phase Not published by FoxESS
Backup power - - Neither datasheet publishes this
Physical
Weight 228.3 kg 254.0 kg -25.7 kg for ECS2900-H7
Weight per kWh 12.6 kg/kWh 13.8 kg/kWh -1.2 kg/kWh for ECS2900-H7
Dimensions 950x570x380 mm 1760x540x385 mm 950x570x380 mm vs 1760x540x385 mm
Ingress protection IP65 IP65 Same
Outdoor-rated Yes - Not published by Deye
Min operating temperature -20 °C -20 °C Same
Max operating temperature 55 °C 60 °C +5 °C for GB-SL-EU (5 modules in series)
Warranty
Warranty - 10 yrs Not published by FoxESS
Warranted throughput - - Neither datasheet publishes this
03

More useful comparisons

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FoxESS ECS2900-H7 vs Solplanet Ai-HB 200A
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Deye GB-SL-EU (5 modules in series) vs Deye BOS-G20
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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.