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(3 modules) vs (4 modules) 19 of 25 identical Swap Change batteries

Deye AI-W5.1-B (3 modules) vs Deye AI-W5.1-B (4 modules)

AI-W5.1-B (3 modules)
13.8 kWh LFP LV
Open battery page Datasheet PDF
VS
AI-W5.1-B (4 modules)
18.4 kWh LFP LV
Open battery page Datasheet PDF
The verdict

(3 modules) leads on the differences that matter

The largest is usable energy: 4.60 kWh apart. 19 of 25 comparable parameters are identical, with 8 more left out because at least one datasheet does not publish them.

See all 6 differences
How alike are they
19 of 25 comparable
parameters are identical
identical differs not published
01

What actually differs

6 of 25 parameters
Parameter (3 modules) (4 modules) Difference
Usable energy 13.80 kWh 18.40 kWh 4.60 kWh apart
Nominal energy 15.36 kWh 20.48 kWh 5.12 kWh apart
Power per kWh 0.93 kW/kWh 0.70 kW/kWh 0.23 kW/kWh more power for its size
Weight 180.5 kg 233.5 kg 53.0 kg lighter
Weight per kWh 13.1 kg/kWh 12.7 kg/kWh 0.4 kg/kWh lighter
Dimensions 1131x720x255 mm 1412x720x255 mm 1131x720x255 mm vs 1412x720x255 mm

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02

Full specification

Parameter (3 modules) (4 modules) Difference
Capacity
Usable energy 13.80 kWh 18.40 kWh 4.60 kWh apart
Nominal energy 15.36 kWh 20.48 kWh 5.12 kWh apart
Depth of discharge 90 % 90 % Same
Max system capacity 30.7 kWh 30.7 kWh Same
Modules per stack 1-6 1-6 Same
Power
Continuous discharge power 12.80 kW 12.80 kW Same
Continuous charge power 12.80 kW 12.80 kW Same
Peak discharge power 18.43 kW 18.43 kW Same
Power per kWh 0.93 kW/kWh 0.70 kW/kWh +0.23 kW/kWh for (3 modules)
Efficiency and lifetime
Round-trip efficiency - - Neither datasheet publishes this
Cycle life 6000 cycles 6000 cycles Same
Cycle test depth 90 % 90 % Same
Capacity at end of life 70 % 70 % Same
Self-discharge - - Neither datasheet publishes this
Electrical
Voltage class Low voltage Low voltage Same
Nominal voltage 51 V 51 V Same
Operating voltage 43.2-57.6 V 43.2-57.6 V Same
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 180.5 kg 233.5 kg -53.0 kg for (3 modules)
Weight per kWh 13.1 kg/kWh 12.7 kg/kWh -0.4 kg/kWh for (4 modules)
Dimensions 1131x720x255 mm 1412x720x255 mm 1131x720x255 mm vs 1412x720x255 mm
Ingress protection IP65 (after stacking) IP65 (after stacking) Same
Outdoor-rated - - Neither datasheet publishes this
Min operating temperature -20 °C -20 °C Same
Max operating temperature 55 °C 55 °C Same
Warranty
Warranty 10 yrs 10 yrs Same
Warranted throughput 16.0 MWh 16.0 MWh Same
03

More useful comparisons

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Deye AI-W5.1-B (3 modules) vs Deye RW-F16
14 differences, the largest is usable energy
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Deye AI-W5.1-B (3 modules) vs Deye SE-F16
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Deye AI-W5.1-B (3 modules) vs FelicityESS LUX-E-48250LG03
10 differences, the largest is usable energy
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Deye AI-W5.1-B (4 modules) vs Deye AI-W5.1-B (5 modules)
5 differences, the largest is usable energy
04

Written summary

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