Victron Inverter Configuration (Open Loop)

Whenever possible, using a closed-loop configuration is recommended with Discover batteries and Victron devices. However, using an open-loop configuration may be required if the closed-loop communication system encounters an issue.

If there is a break in communication between the Victron Energy device and the battery, the Victron device stops charging. Charging only resumes after communication between the Victron device and the HELIOS ESS battery is restored. If communication cannot be restored, you may have to set the system to open loop until an installation professional is available.

As a precautionary measure, it is recommended to program the inverter-charger with the correct voltage-based parameters before setting up the system to operate in a closed-loop configuration. If closed-loop communication fails, after the open loop parameters have been configured, turn the Victron device OFF and ON with the On/Off/Charger Only switch to enable the open-loop settings.

The following describes how to set up open loop on Victron devices.

Setting up Open Loop on Victron Devices

You will need the latest firmware on all connected devices. The following presumes familiarity with VE Configure software. After setting the voltage-based open-loop parameters using the VE Configure 3 software, send all parameters to the inverter-charger and GX device and then restart the GX device.

VE Configure 3 Software

Victron Inverter-Charger Open-loop Configuration Procedure

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

Set the Discover Lithium batteries to ON and set the inverter to ON.
Connect your computer to the Victron GX device or inverter.
On the computer, start the VE Configure 3 software configuration tool.
Enable and disable parameter values according to the tables below.
Send the parameters to the Victron inverter-charger and GX device.
Toggle the On/Off/Charger Only switch to turn the inverter OFF and ON.

VE Configure 3 > General Tab

General Tab	Setting
[AC1] Overruled by remote ⁽¹⁾	Enable
[AC2] Overruled by remote ⁽¹⁾	Enable
Dynamic current limiter	Enable
External current sensor connected	Disable
Enable battery monitor	Enable
State of charge when Bulk finished ⁽²⁾	95%
Battery capacity	Number of batteries x 314 Ah
Charge efficiency ⁽²⁾	1.00

(1) Enable is recommended.

(2) Precautionary settings ignored during normal operation and communication with Discover lithium batteries.

VE Configure 3 > Inverter Tab

Inverter Tab	Setting
DC input low shutdown ⁽¹⁾	48.0 V
DC input low restart ⁽²⁾	52.0 V
DC input low pre-alarm ⁽³⁾	49.5 V
Enable AES ⁽⁴⁾	Disable

(1) The lowest operating voltage allowed. Increase voltage as required.
(2) Restart voltage after DC input low shutdown. Recommend setting to the minimum value (minimum varies according to the DC Input low shutdown value).
(3) 49.5 V value (approximately 10% SOC) will trigger a low battery warning. Increase or decrease as preferred.
(4) Enable AES has no relation to the AES series of batteries available from Discover. Refer to Victron manuals for information on the AES setting and function.

VE Configure 3 > Charger Tab

Charger Tab	Setting
Enable charger	Enable
Battery Type ⁽¹⁾	Blank
Lithium batteries ⁽¹⁾	Enable
Charge curve ⁽¹⁾	Select: Fixed
Absorption Voltage ⁽¹⁾	55.2 V
Float Voltage ⁽¹⁾	53.6 V
Charge Current	Number of batteries x 200 A 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 table in the Minimum Specifications for Battery Systems topic.
Repeated absorption time ^{(1) (2)}	1.0 < 3.0 Hr
Repeated absorption interval ⁽¹⁾	7.0 Days
Absorption time ^{(1) (2)}	1.0 < 3.0 Hr

(1) Precautionary settings ignored during normal operation and communication with Discover lithium batteries.
(2) The recommended minimum is 1.0 hour. Multiple batteries may require a longer time to achieve a smooth completion of charge.

NOTE
Confirm the Float Voltage after installation of any Victron Assistants, and if necessary, set the Float Voltage back to 53.6 V.

NOTE
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. For more information about configuring Victron devices, refer to product documentation on the Victron website (victronenergy.com ) or the LYNK II Victron (Solar) User Manual (805-0040).