Two Inverters, One AES Cabinet

ELECTRIC SHOCK AND FIRE HAZARD
Follow AS/NZS 3000 and AS/NZS 5139 Wiring Rules for conductor size, insulation rating (≥1000 Vdc), and torque specs for safe and code-compliant installation.

Failure to follow these instructions may result in death or serious injury.

CAB-106, CAB-160, and CAB-210 Configurations

When paired with two Solis S6-EH3P inverters, the AES Cabinet may limit the inverters to a maximum continuous output of 52/78/104 kW. Actual discharge performance depends on the inverter model’s battery-side power capacity, as shown below.

Full Load Duration

Inverter Model	Battery Discharge Limit	CAB-106 Estimated Autonomy (104 kWh usable)	CAB-160 Estimated Autonomy (157 kWh usable)	CAB-210 Estimated Autonomy (209 kWh usable)
S6-EH3P29.9K	32.1 kW ×2 = 64.2 kW	~1½ hours (64.2 kW/104 kWh)	~2¼ hours (64.2 kW/157 kWh)	~3¼ hours (64.2 kW/209 kWh)
S6-EH3P30K	33 kW ×2 = 66 kW	~2 hours (52 kW^*/104 kWh)	~2¼ hours (66 kW/157 kWh)	~3 hours (66 kW/209 kWh)
S6-EH3P40K	44 kW ×2 = 88 kW	~2 hours (52 kW^*/104 kWh)	~2 hours (78 kW^*/157 kWh)	~2¼ hours (88 kW/209 kWh)
S6-EH3P50K	55 kW ×2 = 104 kW	~2 hours (52 kW^*/104 kWh)	~2 hours (78 kW^*/157 kWh)	~2 hours (104 kW/209 kWh)

These autonomy estimates assume continuous full-power discharge and operation within safe continuous discharge parameters. Final performance should match the site's energy demand and load profile.

System Scalability – Two Inverters, One AES Cabinet

Two Solis S6-EH3P inverters are paired with one AES battery cabinet.

In this setup:

104/157/209 kWh of usable backup energy between two inverters
Discharge power is limited by the total inverter capacity or battery power limitation (max 52/78/104 kW)
On the backup side, up to six inverters can be connected in parallel, providing 192.6-300 kW of continuous backup power and approximately 312 / 471 / 636 kWh of total backup energy (3 × 104 kWh / 3 × 157 kWh / 3 × 209 kWh).

Grid-Tied (Non-Backup) Scalability

The number of inverters or batteries is unlimited for non-backup use. Each inverter runs independently, allowing systems to scale as large as needed for energy shifting, peak shaving, or other grid-interactive applications.

DC Battery Wiring – Two Inverters, One AES Cabinet

Each Solis S6-EH3P inverter has two battery input terminals, each rated up to 70 A.

The AES Cabinet connects using:

Two positive and two negative 25 mm² (#4 AWG) conductors to each inverter.
Each conductor is protected by a 70 A fuse in the AES Cabinet’s built-in DC distribution box.

This setup ensures balanced current flow to each inverter’s internal DC/DC converter and supports up to 29.9-50 kW continuous charge/discharge, depending on the inverter model.

Always follow AS/NZS 3000 Wiring Rules and the local authority having jurisdiction for conductor sizing, 1,000 Vdc insulation rating, and proper torque values. Verify polarity before energising the system.

Communication – Two Inverters, One AES Cabinet

In a two-to-one configuration, a LYNK II Gateway is required for each inverter to enable real-time, managed (closed-loop) control. The AES Cabinet communicates with one Solis inverter through one LYNK II Gateway (may be included with the battery cabinet), and with a second Solis inverter through a second LYNK II Gateway.

Wiring

Connect one cable from LYNK II #1 CAN port to the Solis inverter #1’s BMS port. Connect a second cable from LYNK II #1’s LYNK port to the J3 port on the AES Cabinet’s High Voltage Box. On most AES Cabinets, a CAT6 cable is already connected to the J3 port on the AES Cabinet’s High Voltage Box and is accessible from the LYNK II.
Connect a third cable from LYNK II #2 CAN port to the Solis inverter #2’s BMS port. Connect a fourth cable from LYNK II #2’s LYNK port to the J4 port on the AES Cabinet’s High Voltage Box.

NOTE

You can use a splitter/combiner, as shown below, to connect two LYNK II Gateways to the J3/J4 ports on the AES Cabinet through a single cable.

Configure LYNK II

Start LYNK ACCESS 2.5.0 or later and update both LYNK II Gateways to firmware to 2.5.0 or later.
Connect to the first LYNK II device. From the LYNK ACCESS software’s LYNK tab, open the Cabinet Settings tile, enable Multi-LYNK, and set it as Primary.

Connect to the second LYNK II device, enable Multi-LYNK and set it as Secondary.

To confirm the system is working correctly, check the battery charging current values on inverter. If values are 50% of the max, then the 2:1 Multi LYNK configuration is successful.

NOTE

Configure the LYNK II Gateways as specified.
In a two inverter/one AES Cabinet system:
- If Multi LYNK is disabled in both LYNK II Gateways, only one of them will interact with the AES Cabinet to allow for charge/discharge.
- If Multi LYNK is disabled in one of the LYNK II Gateways and the other one is enabled as Secondary, both will interact with the AES Cabinet, potentially causing the charge or discharge current to be greater than the maximum allowed (overcurrent).
- If Multi LYNK is enabled and set as Primary in both LYNK II Gateways, or both are set as Secondary, only one of them will communicate with the AES Cabinet and the charge/discharge levels will be reduced by 50%.

The LYNK II communication link enables the inverter to receive real-time battery data, including state of charge, voltage, current, temperature, and charge/discharge limits, ensuring safe, accurate, and optimized operation.

This setup enables two inverters to manage and monitor the battery cabinet, receiving real-time data for state of charge, voltage, current, temperature, and charge/discharge limits from each LYNK II Gateway. Two independent LYNK II Gateways ensure precise, safe, and optimized performance with dual inverters.