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

Deye GB-L20 vs FoxESS ECS2900-H7

Deye GB-L20
GB-L20
18.4 kWh LFP HV
Open battery page Datasheet PDF
VS
FoxESS ECS2900-H7
ECS2900-H7
18.14 kWh 95.0 % round-trip 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 GB-L20 ECS2900-H7 Difference
Usable energy 18.40 kWh 18.14 kWh 0.26 kWh apart
Max system capacity 24.5 kWh 20.2 kWh 4.4 kWh more room to expand
Nominal energy 20.45 kWh 20.16 kWh 0.29 kWh apart
Nominal voltage 512 V 403 V 109 V apart
Weight 214.0 kg 228.3 kg 14.3 kg lighter
Weight per kWh 11.6 kg/kWh 12.6 kg/kWh 1.0 kg/kWh lighter
Max operating temperature 60 °C 55 °C 5 °C more heat tolerant
Modules per stack 2-6 2-7 2-6 vs 2-7
Operating voltage 166.4-700 V 340.2-459.9 V 166.4-700 V vs 340.2-459.9 V
Dimensions 1310x540x385 mm 950x570x380 mm 1310x540x385 mm vs 950x570x380 mm

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

02

Full specification

Parameter GB-L20 ECS2900-H7 Difference
Capacity
Usable energy 18.40 kWh 18.14 kWh 0.26 kWh apart
Nominal energy 20.45 kWh 20.16 kWh 0.29 kWh apart
Depth of discharge 90 % 90 % Same
Max system capacity 24.5 kWh 20.2 kWh +4.4 kWh for GB-L20
Modules per stack 2-6 2-7 2-6 vs 2-7
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 512 V 403 V 109 V apart
Operating voltage 166.4-700 V 340.2-459.9 V 166.4-700 V vs 340.2-459.9 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 214.0 kg 228.3 kg -14.3 kg for GB-L20
Weight per kWh 11.6 kg/kWh 12.6 kg/kWh -1.0 kg/kWh for GB-L20
Dimensions 1310x540x385 mm 950x570x380 mm 1310x540x385 mm vs 950x570x380 mm
Ingress protection IP65 IP65 Same
Outdoor-rated Yes Yes Same
Min operating temperature -20 °C -20 °C Same
Max operating temperature 60 °C 55 °C +5 °C for GB-L20
Warranty
Warranty 10 yrs - Not published by FoxESS
Warranted throughput - - Neither datasheet publishes this
03

More useful comparisons

Open all batteries
Similar capacity
Deye GB-L20 vs Deye GB-SL-EU (5 modules in series)
5 differences, the largest is weight
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Deye GB-L20 vs Solplanet Ai-HB 200A
11 differences, the largest is continuous discharge power
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Deye GB-L20 vs Deye BOS-G20
9 differences, the largest is max system capacity
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FoxESS ECS2900-H7 vs Dyness Tower Pro TP19
13 differences, the largest is cycle life
04

Written summary

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