Minimum Specifications for Battery Systems

Install HELIOS ESS batteries in parallel in a battery bank configuration to increase system capacity. Overall battery system capacity must be correctly sized to meet the requirements of the load and account for:

Total Max Continuous Charge Current
Total Peak Current
Total Max Continuous Discharge Current

The total charging capacity of all charging sources in the system should not exceed the Max Continuous Charge Current operating limit of all the batteries in the system. The same is true for discharge. The total discharging capacity of all loads in the system should not exceed the Max Continuous Discharge Current operating limit of all the batteries in the system.

If the Max Continuous Charge Current or Max Continuous Discharge Current is exceeded for any battery in the system, the BMS in that battery will trigger the over-current protection and disconnect. The charging system’s maximum charge current must be below the operating limit of installed batteries or be curtailed.

The sum of all the Peak Current values for the attached loads must be less than the Peak Current of the battery system, including inrush current values, for any motors and surge values for any inverters.

For HELIOS ESS batteries installed in parallel in a battery bank configuration, the sum of all battery capacities provides the overall capacity value for the battery system. The table below, “HELIOS ESS DC Capacity Values for Sample Battery Systems,” provides DC capacity values for sample Discover systems.

NOTICE

VOLTAGE SPIKE

Exceeding the Max Continuous Current of all the batteries in the system will trigger the battery BMS over-temperature protection quicker, resulting in the disconnection of all batteries in the system.
Disconnection will result in a voltage spike (Load Dump), which may damage components electrically attached to the battery system.

Failure to follow these instructions may result in equipment damage.

NOTE
The maximum number of batteries that can be installed in a closed-loop configuration with a LYNK II Gateway device is 36.

HELIOS ESS DC Capacity Values for Sample Battery Systems (@25°C, 77°F) ^(a)

Parallel System	Max Continuous Discharge Current	Max Continuous Charge Current	Max Input / Output Power	Usable Capacity
1 battery	200 A	200 A	10.24 kW	16 kWh
2 batteries	380 A	380 A	20.48 kW	32 kWh
3 batteries	400 A	400 A	20.48 kW	48 kWh

(a) The above table specifies the upper performance values in a 1 battery, 2 battery, and 3 battery system when connected in parallel. To achieve these performance numbers, all the components in your system, including cables and inverters, must be sized appropriately.