Selectronic Self-Managed (Open Loop) - Battery Setting

Battery charge and discharge rates are managed by the Selectronic device based on settings configured in the SP Link application.

Program the Selectronic inverter-charger with the correct voltage-based parameters so the system can operate in a self-managed (open-loop) configuration.

Self-Managed (Open-Loop) Configuration

Refer to the latest Discover Battery documentation for battery values and the latest Selectronic documentation for details on menu navigation and the setup procedure.

Install and then start the latest version of the SP LINK application.
Either use the Easy Start Guide > Site Configuration Wizard or create a new site and fill in the site connection details.
In the Site Configuration tab, define the site and inverter equipment information.
In the Configuration Settings tab, set the battery parameters as shown in the tables below.
Once the configuration is complete, from Configuration Settings, click Configure SP PRO to send it to the assigned SP PRO units.

Configuration Settings

Configuration can be done in either the Configuration Wizard or the SP LINK application interface.

Site Configuration Wizard and SP LINK Application

SP-LINK - Inverter

Setting	AES RACKMOUNT 48-48-5120	HELIOS ESS 52-48-16000
Quick Start
Battery Type	Lithium LiFePO4
Battery Capacity	100 Ah × number of batteries	314 Ah × number of batteries
Inverter
DC Shutdown Battery 0% Load	When setting the DC Shutdown Battery 0% Load voltage, consider what is set for the Generator Start SoC. These settings should not be the same and should be at least 10% SoC apart. For example, if DC Shutdown Battery 0% Load is 50.2 V (20% SoC), set the Generator Start SoC to 30% SoC or more. 48.0 V (0% SOC) 49.5 V (10% SOC) 50.2 V (20% SOC)
Battery 100% Load	46.0 V
Recovery Voltage	51.2 V
Shutdown SoC	Recommended value varies, depending on the type of installation. For example, when off grid with no generator, set a higher Shutdown SOC such as 20%. If an automatic start generator is configured, 10%.

SP-LINK - Battery

Battery Settings	AES RACKMOUNT 48-48-5120	HELIOS ESS 52-48-16000
Battery
Max Charge Voltage	55.2 V
Hi Battery Alert Voltage	57.6 V
Hi Battery Alert Clear Voltage	56.8 V
Periodic Recharge	7 to 14 days
Peukert's Exponent	1.02
Limit Charge Above °C	50 °C
Limit Rate %	20%

SP-LINK - Charger

Setting	AES RACKMOUNT 48-48-5120	HELIOS ESS 52-48-16000
Charger
Charger Settings	Max Charge Current 95 A x the number of batteries	Max Charge Current 200 A x the number of batteries
Initial Return Voltage	52.9 V
Initial Return SoC	95%
Initial Stage
Voltage	55.2 V
Current	100%
Time	45 minutes
Absorption Stage
Voltage	55.2 V
Current	10%
Absorb - Float Transition
Net Change	1%
ChangeTime	60 minutes
MaxTime	60 minutes
Float Stage
Voltage	55.2 V
Current	10%
LongTerm Float Voltage	55.2 V
Equalise Stage
Voltage	55.2 V
Current	1%
Time	0.1 hours
Battery Temperature Compensation	Not applicable

NOTE

If a DC Solar Charge Controller is used with a SP PRO, there can be some conflicts when charging due to cable impedances. In some instances the displayed SoC on the SP PRO may not reach 100%. If the DC Solar Charge Controller is the main charging source, you may need to set the DC Solar Charge Controller 0.3 V greater than the SP PRO.
The SP PRO inverter may default the SOC to 85% if the DC power supply is suddenly interrupted (e.g. BMS protection). Either reset the SOC via the Service setting or charge the batteries all the way to float mode prior to discharge.
Set at least a 10% difference between the DC Shutdown 0% Load and Generator Start SoC.
Example:
- DC Shutdown 0% Load = 50.2V (20% SoC)
- SoC Start = 30% SoC