WeCo Srl Italia
www.wecobatteries.com
4K4 PRO V 1.11 28-9-2021
SYSTEM DESIGN
Systems Design is the process of defining the architecture, components, modules, interfaces, and load data for a
system to satisfy specified requirements.
For a solar system these components are the PV modules, inverter/charge controller & batteries, as well as the
different interfaces of those components.
BATTERY OPERATION
There are several factors that affect the operation of the battery concerning its ability to deliver capacity and life
expectancy.
Storage
Module properly packed into original DG9 carton box to be stored indoors in a clean, level, dry, cool location.
Recommended storage temperature is 25°C
The Battery can be stored in the range of -20°C + 45°C but it is required an inspection and recharge every three
months ( max charging current is 0.1C)
Max SoC storage % is 50%
Temperature
Many chemical reactions are effected by temperature, and this is true of the reaction that occurs in a storage battery.
The chemical reaction of a Li-Ion is slowed down by a lowering of the electrolyte temperature that results in less
capacity.
A battery that will deliver 100% of rated capacity at25°C will only deliver approximately 75% of rated capacity at 10°C.
At temperatures below -7°C the BMS will allow only 0.1C charging Current below -7°C the charge is forbidden.
As part of the performance Warranty, Charge and Discharge shall be in the range 20-25°C 0,5C any usage outside this
range is not covered by Performance Warranty
Depth of Discharge (DoD)
Depth of discharge is a function of design. The deeper the discharge per cycle, the shorter the life of the battery. A
cycle is a discharge and its subsequent recharge regardless of depth of discharge.
The number of cycles at a specific DoD and the projected life in years the battery / battery system will provide prior
to needing replacement.
Charging
Majority of battery capacity/life issues can be traced to improper charging. Improper charging settings may lead to
an overcharging or undercharging condition.
WeCo guarantee only batteries connected via BMS line to the Approved inverter
Typical Inverters/Charge Controllers are equipped with CAN/BMS interface ad no settings are required to charge
and discharge the battery.
