Setting Closed-loop Configuration on the GROWATT Inverter-Charger

After selecting the LV-BMS communication protocol for the LYNK II, complete the closed-loop configuration settings on the GROWATT inverter-charger. Ensure the Discover Lithium Batteries are networked with LYNK II and that the LYNK II is connected to the GROWATT CAN port.

If necessary, first configure GROWATT inverter-chargers to operate in parallel by establishing the inverter-charger master/slave relationships and phase designations before setting the parameters for battery operation. Configuring the master inverter-charger will cascade parameters and settings to the slave inverter-chargers.

Closed-loop Configuration

Refer to the latest Discover Energy Systems documentation for battery values and the latest GROWATT documentation for menu navigation and details on the setup procedure.

Set the Discover Lithium batteries to ON and set the inverter-charger to ON.
Using the touch screen and keypad on the inverter-charger, navigate to Main Screen > Settings > Battery Settings.
Specify the battery settings according to the instructions in the tables that follow.
1. Touch a field to specify its value.
2. Touch the Up and Down arrows to scroll through the screens.
Exit and restart the inverter-charger.

NOTE
If using multiple inverter-chargers, configure GROWATT inverter-chargers to operate in parallel before setting the battery operation parameters.

Settings > Battery Settings

Battery Settings (page 1)
Battery Mode	Select the Lithium option to use the battery BMS.
Refer to the electrical specifications in the battery manual to set the battery, charge, and discharge parameters.
Battery Capacity	Set to the number of Discover Lithium batteries x Ah capacity of each. For example, set to 200 Ah for two AES RACKMOUNT batteries, each rated at 100 Ah capacity.
Max Charge	Set to the lesser of the inverter’s max charge capacity, or the quantity of attached batteries, multiplied by the battery model’s specific max charge rating. For example, the SPH 10000TL-HU-US inverter would be set to the lessor of the inverter’s max charge rate of 200 A, or 190 A for two AES RACKMOUNT batteries rated at 95 A max charge each. NOTE: Each HELIOS ESS battery is rated at a 200 A charge rate, but when connected in parallel, the maximum current is limited by internal busbars. For the recommended maximum current for paralleled HELIOS ESS, refer to the HELIOS Manual, Minimum Specifications for Battery Systems.
Max Discharge	Set to the lesser of the inverter’s max discharge capacity, or the quantity of attached batteries, multiplied by the battery model’s specific max discharge rating. For example, the SPH 10000TL-HU-US inverter would be set to the lessor of the inverter’s max discharge rate of 200 A, or 190 A for two AES RACKMOUNT 48-48-5120 batteries rated at 95 A max discharge each. NOTE: Each HELIOS ESS battery is rated at a 200 A discharge rate, but when connected in parallel, the maximum current is limited by internal busbars. For the recommended maximum current for paralleled HELIOS ESS, refer to the HELIOS Manual, Minimum Specifications for Battery Systems.

Battery Setting (page 3)
Lithium Mode	Set this value to 00.
LBCO	Specify the battery SOC for when to stop discharge — low battery cut-off (LBCO) — and when to allow discharge again — low battery cut-in (LBCI).
LBCO Alarm
LBCI

Set other settings to match the user preferences or the particular use case.