The SUN2000 is a three-phase grid-tied PV string inverter that converts the DC power generated by PV strings into AC power and feeds the power into the power grid.

Network Application

The SUN2000 applies to grid-tied PV systems for residential rooftops and small ground plants. Typically, a grid-tied system consists of the PV string, SUN2000, AC switch, and alternating current distribution unit (ACDU).

Figure: Networking application

Figure: Networking application – Inverter cascading scenario


  •  indicates a power cable,  indicates a signal cable,  indicates wireless communication.
  • If the inverter is connected to the FusionSolar app over its built-in WiFi network, only local commissioning can be performed.
  • In the RS485 cascading communication networking, the master inverter model is SUN2000-(3KTL-20KTL)-M0, and the slave inverter model can be SUN2000-(3KTL-20KTL)-M0, SUN2000-50KTL/60KTL/65KTL-M0, SUN2000-29.9KTL/36KTL, or SUN2000-33KTL-A

A. PV string

B. DC switch

C. SUN2000

D. AC switch


F. Smart Power Sensor

G. Power grid

H. 4G Smart Dongle

I. WLAN-FE Smart Dongle

J. Router

K. FusionSolar management system

L. Fusion Solar app

M. Load

N. Ripple Control Device

Supported Power Grids

Power grid types supported by the SUN2000 include TN-S, TN-C, TN-C-S, TT, and IT.

Figure: Supported power grids


  • In a TT power grid, the N-PE voltage should be lower than 30 V.
  • In an IT power grid, you need to set Isolation settings to Input not grounded, with a transformer

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