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ECS2900-H7 vs GB-L20 8 of 18 identical Swap Change batteries

FoxESS ECS2900-H7 vs Deye GB-L20

FoxESS ECS2900-H7
ECS2900-H7
18.14 kWh 95.0 % round-trip LFP HV
Open battery page Datasheet PDF
VS
Deye GB-L20
GB-L20
18.4 kWh LFP HV
Open battery page Datasheet PDF
The verdict

GB-L20 leads on the differences that matter

The largest is usable energy: 0.26 kWh apart. 8 of 18 comparable parameters are identical, with 15 more left out because at least one datasheet does not publish them.

See all 10 differences
How alike are they
8 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

10 of 18 parameters
Parameter ECS2900-H7 GB-L20 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 214.0 kg 14.3 kg lighter
Weight per kWh 12.6 kg/kWh 11.6 kg/kWh 1.0 kg/kWh lighter
Max operating temperature 55 °C 60 °C 5 °C more heat tolerant
Modules per stack 2-7 2-6 2-7 vs 2-6
Operating voltage 340.2-459.9 V 166.4-700 V 340.2-459.9 V vs 166.4-700 V
Dimensions 950x570x380 mm 1310x540x385 mm 950x570x380 mm vs 1310x540x385 mm

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

02

Full specification

Parameter ECS2900-H7 GB-L20 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-L20
Modules per stack 2-7 2-6 2-7 vs 2-6
Power
Continuous discharge power - 20.48 kW Not published by FoxESS
Continuous charge power - 20.48 kW Not published by FoxESS
Peak discharge power - 25.60 kW Not published by FoxESS
Power per kWh - 1.11 kW/kWh Not published by FoxESS
Efficiency and lifetime
Round-trip efficiency 95.0 % - Not published by Deye
Cycle life 6000 cycles 6000 cycles Same
Cycle test depth 90 % - Not published by Deye
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 166.4-700 V 340.2-459.9 V vs 166.4-700 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) None (battery only) Same
Inverter power - - Neither datasheet publishes this
Grid connection - - Neither datasheet publishes this
Backup power - - Neither datasheet publishes this
Physical
Weight 228.3 kg 214.0 kg -14.3 kg for GB-L20
Weight per kWh 12.6 kg/kWh 11.6 kg/kWh -1.0 kg/kWh for GB-L20
Dimensions 950x570x380 mm 1310x540x385 mm 950x570x380 mm vs 1310x540x385 mm
Ingress protection IP65 IP65 Same
Outdoor-rated Yes Yes Same
Min operating temperature -20 °C -20 °C Same
Max operating temperature 55 °C 60 °C +5 °C for GB-L20
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 Dyness Tower Pro TP19
13 differences, the largest is cycle life
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FoxESS ECS2900-H7 vs Deye GB-SL-EU (5 modules in series)
11 differences, the largest is usable energy
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FoxESS ECS2900-H7 vs Solplanet Ai-HB 200A
10 differences, the largest is usable energy
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Deye GB-L20 vs Deye BOS-G20
9 differences, the largest is max system capacity
04

Written summary

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