Mecer Dyness B3 3.5 kWh Lithium Battery 48V DC, 6000 cycles calendar life @ 80% DOD, 74Ah nominal capacity, 50A Maximum continuous discharge current, 50A Maximum continuous charge current. The Dyness battery B4850 Module is widely in energy storage and electrical products. Household Energy Storage Systems, Centralized power station energy storage systems.

LiFePO4 battery, Safe, Longer life span
Modular design, Easy to stack, Quick installation
Larger energy capacity
Natural cooling with optional heat/fan configuration
Wide temperature range of -20~50 C

Specifications:
Nominal Energy: 3.55 kWh
Nominal Capacity: 74Ah
Nominal Voltage: 48V
Max. Continuous Discharge Current: 50 A
Max. Continuous Charge Current: 50 A
Charging Cut-off Voltage: 54V
Discharging Cut-off Voltage: 40.5V
Net weight: 30kg
Dimensions [w x d x h]: 400 x 360 x 133.5mm
Protection Level: IP20
Calendar Life: 6000 Cycles (based on 0.2C Charging/Discharging @25 degrees celsius, 80% dod)
Communication: CAN/RS485
Configuration: maximum 40 modules in parallel
Recommended C Rate: 0.5C

This is not a complete solution and requires a qualified electrician / solar installer to connect to the client’s DB and issue a COC certificate.