Grid-tied ESS Networking

Networking 1: Single Inverter

The grid-tied ESS consists of PV strings, LUNA2000 batteries, inverter, AC switch, loads, power distribution unit (PDU), power meter, and grid.

SUN2000-(2KTL-6KTL)-L1, SUN2000-(3KTL-10KTL)-M1 inverters are supported.

The PV string converts solar energy into electric energy, which is then converted by the inverter to power loads or be fed to the grid.

Networking 2: Multiple Inverters Cascaded

You can add inverters and batteries to increase capacity. A maximum of three inverters can be cascaded. Each battery connects to the inverter through an independent RS485 port and is managed by the inverter connected to it.

SmartLogger Networking

• SmartLogger V300R001C00SPC100 and later versions are supported in this scenario. For details about commissioning, see 6.3 ''Battery Commissioning''.
• The grid-tied ESS supports cascading of SUN2000-(3KTL-10KTL)-M1, SUN2000-(8KTL-20KTL)-M2, and SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-M3.

Figure 3-2 Networking of one SUN2000-(3KTL-10KTL)-M1 and two SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-M3 inverters (dashed boxes indicate optional components)

The grid-tied ESS supports a maximum of three SUN2000-(2KTL-6KTL)-L1 inverters (with batteries) cascaded. In this scenario, the inverters can be connected to the grid only at the same phase and controlled only by a single-phase power meter. Grid connection at different phases or using a three-phase power meter is not supported.

Figure 3-3 Networking diagram of the cascaded SUN2000-(2KTL-6KTL)-L1 inverters (dashed boxes indicate optional components)

Smart Dongle Networking

• The grid-tied ESS supports inverter cascading. A maximum of three inverters can be cascaded. The batteries can be connected to one of the inverters for management. The batteries, power meter, and Smart Dongle need to be connected to the same inverter.
• Inverters that support batteries cannot be cascaded with those that do not. For example, SUN2000-(3KTL-10KTL)-M1 (with batteries) and SUN2000-(8KTL-20KTL)-M2 (without batteries) cannot be cascaded through Smart Dongle.
• When the battery working mode is set to Maximum self-consumption or TOU (time-of-use), the Smart Dongle must be connected. If the working mode is set to Fully fed to grid, the Smart Dongle is optional.

Figure 3-4 Smart Dongle networking (dashed boxes indicate optional components)