BYD Battery-Box Premium HVS 7.7 vs FoxESS ECS2900-H3
VS
The verdict
ECS2900-H3 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 7.7
ECS2900-H3
Difference
Max system capacity
12.8 kWh
20.2 kWh
7.4 kWh more room to expand
Usable energy
7.68 kWh
7.78 kWh
0.10 kWh apart
Round-trip efficiency
96.0 %
95.0 %
1.0 pp less lost per cycle
Nominal energy
7.68 kWh
8.64 kWh
0.96 kWh apart
Depth of discharge
100 %
90 %
10 pp more of the cells usable
Nominal voltage
307 V
173 V
134 V apart
Weight
129.0 kg
100.3 kg
28.7 kg lighter
Weight per kWh
16.8 kg/kWh
12.9 kg/kWh
3.9 kg/kWh lighter
Min operating temperature
-10 °C
-20 °C
10 °C more cold tolerant
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
240-360 V
145.8-197.1 V
240-360 V vs 145.8-197.1 V
Dimensions
995x585x298 mm
470x570x380 mm
995x585x298 mm vs 470x570x380 mm
02
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Price offers
Shop
Battery-Box Premium HVS 7.7
ECS2900-H3
At this shop
Shop prices by brand: See 121 BYD offers · See 21 FoxESS offers
03
Full specification
Parameter
Battery-Box Premium HVS 7.7
ECS2900-H3
Difference
Capacity
Usable energy
7.68 kWh
7.78 kWh
0.10 kWh apart
Nominal energy
7.68 kWh
8.64 kWh
0.96 kWh apart
Depth of discharge
100 %
90 %
+10 pp for Battery-Box Premium HVS 7.7
Max system capacity
12.8 kWh
20.2 kWh
+7.4 kWh for ECS2900-H3
Modules per stack
2-5
2-7
2-5 vs 2-7
Power
Continuous discharge power
7.68 kW
-
Not published by FoxESS
Continuous charge power
7.68 kW
-
Not published by FoxESS
Peak discharge power
15.36 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 7.7
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
307 V
173 V
134 V apart
Operating voltage
240-360 V
145.8-197.1 V
240-360 V vs 145.8-197.1 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
129.0 kg
100.3 kg
-28.7 kg for ECS2900-H3
Weight per kWh
16.8 kg/kWh
12.9 kg/kWh
-3.9 kg/kWh for ECS2900-H3
Dimensions
995x585x298 mm
470x570x380 mm
995x585x298 mm vs 470x570x380 mm
Ingress protection
IP55
IP65
IP55 vs IP65
Outdoor-rated
Yes
Yes
Same
Min operating temperature
-10 °C
-20 °C
-10 °C for ECS2900-H3
Max operating temperature
50 °C
55 °C
+5 °C for ECS2900-H3
Warranty
Warranty
10 yrs
-
Not published by FoxESS
Warranted throughput
-
-
Neither datasheet publishes this
04
Open all batteries
More useful comparisons
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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.