Sol-Ark Inverter Configuration (Closed Loop Without LYNK II)

• If there is a break in communication between the HELIOS ESS battery and inverter-charger for more than ten seconds, the inverter-charger will safely stop operation, so long as the BMS Lithium Batt and the BMS_Err_Stop parameters are both enabled on the Sol-Ark inverter-charger. The inverter-charger will display an F58 BMS Communication Fault if communication is lost. The Sol-Ark inverter-charger will check every five minutes and resume closed-loop operation if communication is re-established.

• If communication cannot be reestablished and you need to resume operation, you may have to manually convert the Sol-Ark inverter to an open-loop configuration. For instructions on configuring open loop, refer to Sol-Ark Inverter Configuration (Open Loop).

• It is recommended that the Sol-Ark inverter be programmed with the appropriate open-loop settings before enabling closed-loop communication.

Depending on your system and particular use case, there may be other settings that require configuration. Refer to the inverter manual for information on these settings.

Batt Capacity

Set to the number of Discover Lithium batteries x Ah capacity of each. For example, set to 628 Ah for two HELIOS ESS 52-48-16000 batteries, each rated 314 Ah capacity.

Max A Charge

For a single inverter, set to the lesser of the inverter’s maximum charge rate or the quantity of attached batteries multiplied by the battery’s maximum charge rating.

For example:

Single phase system with 12K-2P-N inverter and two HELIOS ESS 52-48-16000 batteries

• Set the 12K-2P-N inverter to the lessor of the inverter’s maximum charge rate of 185 A, or 380 A for two HELIOS ESS 52-48-16000 batteries. ⁽¹⁾
  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 Minimum Specifications for Battery Systems.

Three-phase system with three Sol-Ark 15K-2P-N inverters and two HELIOS ESS 52-48-16000 batteries

• For a three phase system set to the lessor value between the master inverter’s maximum charge rate or the master inverter, or the quantity of attached batteries multiplied by the battery’s maximum charge rating divided by the number of inverters. For example, set the 12K-2P-N inverter to the lessor of the inverter’s maximum charge rate of 185 A, or 133 A for two HELIOS ESS 52-48-16000 batteries that are each rated at a maximum charge of 200 A, and then divided by three inverters (2 x 200 A ÷ 3 = 133.33 A).

Max A Discharge

For a single inverter, set to the lesser value between the inverter’s maximum discharge rate or the quantity of attached batteries multiplied by the battery’s maximum discharge rating. For example, set the 12K-2P-N inverter to the lesser of the inverter’s maximum discharge rate of 185 A, or 380 A for two HELIOS ESS 52-48-16000 batteries.

• 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 Minimum Specifications for Battery Systems.

For a three-phase system, set to the lesser value between the master inverter’s maximum discharge rate or the quantity of attached batteries multiplied by the battery’s maximum discharge rating divided by the number of inverters. For example, set the 12K-2P-N inverter to the lesser of the inverter’s maximum discharge rate of 185 A, or 133 A for two HELIOS ESS 52-48-16000 batteries that are each rated at a maximum discharge rate of 200 A and then divided by 3 inverters (2 x 200 A ÷ 3 = 133.33 A).

TEMPCO

This field is disabled when the BMS Lithium Batt check box is selected.

Use Batt V Charged

Disable

Use Batt % Charged

Enable

BMS Lithium Batt

Enable and set the value to 00. ⁽²⁾

Activate Battery

Enable

StartV

Unavailable (Grey) in a closed-loop configuration.

Start%

Set to user preference based on battery State-Of-Charge as a percentage. The recommended minimum is 10%.

Shutdown

Adjust values to support the use case or keep the original values. ⁽¹⁾

Low Batt

Restart

Batt Empty V

48 V

Batt Resistance

Set to: 10 mOhm divided by the number of batteries (plus the mOhm value for cable resistance, if known). ⁽²⁾

Batt Charge Efficiency

98%

BMS_Err_Stop

Selecting this check box is recommended. A check mark causes the inverter-charger to stop operating if there is a communication error with the battery BMS.