BYD Battery-Box Premium HVS 5.1 vs FoxESS ECS2900-H2
VS
The verdict
ECS2900-H2 leads on the differences that matter
The largest is max system capacity: 7.4 kWh more room to expand. 4 of 19 comparable parameters are identical, with 14 more left out because at least one datasheet does not publish them.
See all 15 differencesHow alike are they
4
of 19 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
15 of 19 parameters
What actually differs
Parameter
Battery-Box Premium HVS 5.1
ECS2900-H2
Difference
Max system capacity
12.8 kWh
20.2 kWh
7.4 kWh more room to expand
Round-trip efficiency
96.0 %
95.0 %
1.0 pp less lost per cycle
Nominal energy
5.12 kWh
5.76 kWh
0.64 kWh apart
Depth of discharge
100 %
90 %
10 pp more of the cells usable
Nominal voltage
205 V
115 V
90 V apart
Weight
91.0 kg
68.3 kg
22.7 kg lighter
Weight per kWh
17.8 kg/kWh
13.2 kg/kWh
4.6 kg/kWh lighter
Min operating temperature
-10 °C
-20 °C
10 °C more cold tolerant
Usable energy
5.12 kWh
5.18 kWh
0.06 kWh apart
Cycle test depth
100 %
90 %
10 pp apart
Max operating temperature
50 °C
55 °C
5 °C more heat tolerant
Ingress protection
IP55
IP65
IP55 vs IP65
Modules per stack
2-5
2-7
2-5 vs 2-7
Operating voltage
160-240 V
97.2-131.4 V
160-240 V vs 97.2-131.4 V
Dimensions
762x585x298 mm
380x570x380 mm
762x585x298 mm vs 380x570x380 mm
02
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Price offers
Shop
Battery-Box Premium HVS 5.1
ECS2900-H2
At this shop
Shop prices by brand: See 121 BYD offers · See 21 FoxESS offers
03
Full specification
Parameter
Battery-Box Premium HVS 5.1
ECS2900-H2
Difference
Capacity
Usable energy
5.12 kWh
5.18 kWh
0.06 kWh apart
Nominal energy
5.12 kWh
5.76 kWh
0.64 kWh apart
Depth of discharge
100 %
90 %
+10 pp for Battery-Box Premium HVS 5.1
Max system capacity
12.8 kWh
20.2 kWh
+7.4 kWh for ECS2900-H2
Modules per stack
2-5
2-7
2-5 vs 2-7
Power
Continuous discharge power
5.12 kW
-
Not published by FoxESS
Continuous charge power
5.12 kW
-
Not published by FoxESS
Peak discharge power
10.24 kW
-
Not published by FoxESS
Power per kWh
1.00 kW/kWh
-
Not published by FoxESS
Efficiency and lifetime
Round-trip efficiency
96.0 %
95.0 %
+1.0 pp for Battery-Box Premium HVS 5.1
Cycle life
-
6000 cycles
Not published by BYD
Cycle test depth
100 %
90 %
10 pp apart
Capacity at end of life
-
-
Neither datasheet publishes this
Self-discharge
-
-
Neither datasheet publishes this
Electrical
Voltage class
High voltage
High voltage
Same
Nominal voltage
205 V
115 V
90 V apart
Operating voltage
160-240 V
97.2-131.4 V
160-240 V vs 97.2-131.4 V
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
91.0 kg
68.3 kg
-22.7 kg for ECS2900-H2
Weight per kWh
17.8 kg/kWh
13.2 kg/kWh
-4.6 kg/kWh for ECS2900-H2
Dimensions
762x585x298 mm
380x570x380 mm
762x585x298 mm vs 380x570x380 mm
Ingress protection
IP55
IP65
IP55 vs IP65
Outdoor-rated
Yes
Yes
Same
Min operating temperature
-10 °C
-20 °C
-10 °C for ECS2900-H2
Max operating temperature
50 °C
55 °C
+5 °C for ECS2900-H2
Warranty
Warranty
10 yrs
-
Not published by FoxESS
Warranted throughput
-
-
Neither datasheet publishes this
04
Open all batteries
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05
Written summary
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Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate.