Sunways STT 4-25kW Series Grid-connected PV Inverter Installation Guide

: June 5, 2024
: sunways

Table of Contents

Packing List
Installation Spacing
Bracket Dimensions
Mounting the Inverter
DC Connector Assembly Procedure
DC Connector Connection
Ground Terminal Connection
AC Connector Assembly
AC Connector Connection
Grid Connection Steps
Documents / Resources

QUICK INSTALLATION GUIDE
STT 4~25kW Series
Grid-connected PV Inverter
Three Phase Dual MPPT

Packing List

Figure 1 Packing list

Note| ①| cEoxpnnoertctliomr is &alrceoandtyroplrvee- irnssiotanlle2dpcinss;idReS4th8e5 iannvderDteRrE).D version 1pcs (This
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②| STT 4-12kW 2pcs / STT 15kW 3pcs / STT 17-25kW 4pcs.
③| DRED version only (This connector is already pre-installed inside the inverter).

Installation Spacing

Bracket Dimensions

Use the wall bracket as the template to mark the position of 5 holes on the wall. Use an electrical driller with a 10mm diameter bit to drill 5 holes on the wall and make sure the hole depth is 80mm.

Mounting the Inverter

Insert the expansion tubes into the holes and tighten them, then ﬁx the bracket onto the wall with expansion screws by using a cross screwdriver. Lift up the inverter with both hands, hang the back rail on the ﬁxed wall bracket carefully.

DC Connector Assembly Procedure

Use a 2.5-4mm² PV cable, strip oﬀ the cable sheath for 7mm, insert the stripped head into the metal terminal and use a crimping plier to press it tightly, insert the metal terminal into the corresponding PV connector and tighten the nut.

DC Connector Connection

Insert the positive and negative connectors into the inverter PV connectors respectively.
Note:

Disconnect the AC breaker on the grid side when connecting the PV connectors.
The DC switch must be switched to the “OFF position”.

Ground Terminal Connection

Note: Inverter must be well-grounded for resisting surge voltage shock and improving EMI performance.

AC Connector Assembly

Peel the insulation sleeve of AC cable oﬀ for 50mm, and peel oﬀ the end of 3L /PE / N wires for 8mm.

Insert the stripped end of 3L/N/PE cables into the AC terminal head. Tighten the screws in the terminal with an Allen key to ensure a reliable connection.

AC Connector Connection

An AC breaker must be connected on the AC side of the inverter. The recommended AC cable and breaker for Sunways STT 4-25kW series three-phase inverters are shown in the following table: Connect the AC connector to the inverter AC terminal, and rotate the AC connector buckle clockwise until it’s tight enough.

Model	Copper wire	Breaker
STT-4KTL	2.5-10mm²	20A

STT-5KTL

STT-6KTL

| 2.5-10mm²

2.5-10mm²

| 20A

20A

STT-8KTL| 3.2-10mm²| 20A
STT-10KTL| 4-10mm²| 32A
STT-12KTL| 6-10mm²| 32A
STT-15KTL| 6-10mm²| 32A
STT-17KTL

STT-20KTL

| 8-10mm²

8-10mm²

| 40A

40A

STT-25KTL| 8-10mm²| 50A

Note: Check the local standards for more details.

Grid Connection Steps

Check whether all connectors are correctly connected.
Switch the AC breaker on.
Turn the DC Switch to the “ON” position.
The inverter starts self-checking and the screen displays “checking”.
After self-checking is completed, the inverter will start to generate a power indicator that will light up and the real-time power will be displayed on the screen.

Monitoring Device Conﬁguration Guide

０１Monitoring Device Installation
Insert the module into the COM port at the inverter bottom and pay attention to the direction of the module when assembling (the side with the indicator light is facing up). A “click” sound heard represents the assembly is in place.

For ﬁrst time use, the WiFi module needs to be conﬁgured. Following the “WiFi Conﬁguration Guide” below. If the WiFi password has changed. The WiFi dongle will need to be reconﬁgured.

WiFi module conﬁguration guide

WiFi module conﬁguration.

A. Insert the WiFi module into the COM port at the bottom of the inverter and power on the inverter.
B. Use a laptop or Smartphone and turn on the WLAN connection.
C. Search for the WiFi name “sunways-WiFi****” (*represents the last 8 numbers of the inverter SN) and click the WiFi name.
D. WiFi connection succeeded as shown in Figure 17.
Open the Website http://10.10.100.254, see the following picture, the username and password are all “admin” and click “Sign in”.
Log in to the “System” interface.
Note: Click the “Chinese/English” in the upper right corner to switch the interface language.
Select “STA setting” and click “Scan”. A list of WiFi network will show up.
.
Select the household’s WiFi name and click “OK”.
Note: Only support 2.4GHz WiFi.
In the pop-up window, click “OK” to key in the WiFi password.
Input the password in the blank and click “Save”.
Note: Password is case sensitive.
The system will show “ Saved Successfully! ”, click “Restart” to complete the WiFi conﬁguration.
After the reboot, the green indicator on the WiFi module will be always on.

GRID-CONNECTED PV INVERTER
+61 2 8188 2450
Sunways Technologies Co., Ltd.
Sunways AU Support:
Phone: +61 2 8188 2450
Website: www.suntech-power.com.au
Email: [email protected]
Address: Suite 1203, Level 12, Tower 2, 475 Victoria Avenue, Chatswood,
NSW 2067 Australia

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Sunways Technologies Co.,Ltd.
S11-00013-01

Documents / Resources

| Sunways STT 4-25kW Series Grid-connected PV Inverter [pdf] Installation Guide
STT 4-25kW, Series Grid-connected PV Inverter, Three Phase Dual MPPT, STT 4-25kW Series Grid-connected PV Inverter
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