BYD Battery-Box Premium HVS 5.1 vs FoxESS EP5
VS
The verdict
EP5 leads on the differences that matter
The largest is usable energy: 0.46 kWh apart. 6 of 19 comparable parameters are identical, with 14 more left out because at least one datasheet does not publish them.
See all 13 differencesHow alike are they
6
of 19 comparable
parameters are identical
parameters are identical
identical
differs
not published
01
13 of 19 parameters
What actually differs
Parameter
Battery-Box Premium HVS 5.1
EP5
Difference
Usable energy
5.12 kWh
4.66 kWh
0.46 kWh apart
Max system capacity
12.8 kWh
18.6 kWh
5.8 kWh more room to expand
Round-trip efficiency
96.0 %
95.0 %
1.0 pp less lost per cycle
Depth of discharge
100 %
90 %
10 pp more of the cells usable
Nominal voltage
205 V
192 V
13 V apart
Weight
91.0 kg
50.5 kg
40.5 kg lighter
Weight per kWh
17.8 kg/kWh
10.8 kg/kWh
6.9 kg/kWh lighter
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
Nominal energy
5.12 kWh
5.18 kWh
0.06 kWh apart
Operating voltage
160-240 V
174-219 V
160-240 V vs 174-219 V
Dimensions
762x585x298 mm
625x380x147 mm
762x585x298 mm vs 625x380x147 mm
02
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Price offers
Shop
Battery-Box Premium HVS 5.1
EP5
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
EP5
Difference
Capacity
Usable energy
5.12 kWh
4.66 kWh
0.46 kWh apart
Nominal energy
5.12 kWh
5.18 kWh
0.06 kWh apart
Depth of discharge
100 %
90 %
+10 pp for Battery-Box Premium HVS 5.1
Max system capacity
12.8 kWh
18.6 kWh
+5.8 kWh for EP5
Modules per stack
2-5
-
Not published by FoxESS
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
-
4000 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
192 V
13 V apart
Operating voltage
160-240 V
174-219 V
160-240 V vs 174-219 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
50.5 kg
-40.5 kg for EP5
Weight per kWh
17.8 kg/kWh
10.8 kg/kWh
-6.9 kg/kWh for EP5
Dimensions
762x585x298 mm
625x380x147 mm
762x585x298 mm vs 625x380x147 mm
Ingress protection
IP55
IP65
IP55 vs IP65
Outdoor-rated
Yes
Yes
Same
Min operating temperature
-10 °C
-10 °C
Same
Max operating temperature
50 °C
55 °C
+5 °C for EP5
Warranty
Warranty
10 yrs
10 yrs
Same
Warranted throughput
-
-
Neither datasheet publishes this
04
Open all batteries
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10 differences, the largest is usable energy
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.