GW15-30K-ET Product Introduction

Author: Leo

2023-08-23 15:20

1. Background

With the development of the economy and the improved living standard, on one hand, home loads are becoming more and more diversified. The power of the home loads are larger than ever. Especially in large houses or villas, small power inverters often cannot cover the demand. On the other hand, the ET15-30K can be used in small-scale industrial and commercial businesses, providing a flexible solution for businesses with smaller power needs.

The ET15-30K is the high power version of the ET series, and this power range consists of the following four models:

 

GW15K-ET

GW20K-ET

GW25K-ET

GW29.9K-ET

GW30K-ET

 

2. Differences and features between ET5-10K with ET15-30K

Mode	ET5-10	ET15-20	ET25-30
Nominal Output Power (W)	5000-10000	15000-20000	25000-30000
Number of battery Strings	1	1	2
Max. charge/discharge current (A)	25	50	50x2
Max. number of MPP Trackers	2	2	3
Number of Strings per MPPT	1	2	2
Max. Input Current per MPPT(A)	16	30	30
Cooling	Nature Cooling	Intelligent Fan Cooling	Intelligent Fan Cooling
Using for C&I	×	√	√
Weight(Kg)	24Kg	48Kg	54Kg

 

3. Products Overview

3.1 Colors and Dimension

ET15-30KW is a three-phase hybrid inverter. The new design comes in a gorgeous color and a compact size with a logo of “W”: pearl white and 660 mm (H)*520 mm (W) *220 mm (D). Besides, ET15-30K has soft arcs. All these designs make it more fit for modern home style.

3.2 Appearance

Here we will show the appearance of the ET15-30K and the functions represented by each component and interface.

1	DC switch lock hole
2	DC switch
3	PV input terminal (PV+/-)
4	Communication module port (COM)
5	METER communication port
6	Communication port (COM2)
7	Battery input terminal (BAT+/-)
8	BMS communication port
9	AC output terminal (On-Grid and Back-Up)
10	Indicators
11	PE terminal
12	Handle
13	Mounting plate
14	Heat Sink

*Note: No.1 DC switch lock hole is only for Austraila.

 

3.3 Functional Features

3.3.1 Power derating

This is a protective function and is mainly used in the following scenarios: Inverter's output power percentage has been set, Overfrequency derating and AC side overvoltage/current. The purpose of this feature is for the safety of the inverter operation. In non-ideal conditions, the inverter will automatically reduce the output power.

 

3.3.2 Multi-String Battery Solutions

It is worth noting that in the ET15-30 series, the ET25-30K models have two battery communication ports, it means 2 battery input for ET25-30K and those two strings of batteries exist independently of each other. Max. 50A charge/discharge current for each battery input and support different brands and capacities of batteries. This means higher battery compatibility and greater extended energy, and the ability to run at full power of 30kW.

 

3.3.3 PV Isolation Resistance Detection (ISO)

ISO is to detect the DC part of the PV system, including PV modules and DC cables. When the inverter detects that the positive or negative insulation impedance to ground on the PV side is too low, the inverter must display a fault and shut down, and cannot enter the grid.

 

3.3.4 Ground Fault Circuit Interrupter (GFCI)

The reason for this is the distributed capacitance between the PV panel and the earth. Leakage currents can be harmful to humans, affect EMC (Electro Magnetic Compatibility) and reduce system efficiency. This function is realized by installing an RCD (rated current device) on the AC side of the inverter.

 

3.3.5 Arc Fault Circuit Interrupter (AFCI)

The main causes of electric arcs are damage, aging and misconnections the connectors and cables. The inverter has an integrated AFCI function. When the inverter detects an electric arc, users can find the time of the fault and the detailed phenomenon through the app. If 5 faults occur within 24 hours, the inverter will shut down and will need to be cleared before it can operate normally.

 

3.3.6 Rapid Shutdown (RSD)

Transmitter sends ‘keep alive signal’ consecutively to receivers connected to each PV panel. SoC (System on Chip) inside the receiver will turn on the MOS, and then enable PV module to output power. When multiple heartbeat signals cannot be received consecutively, SoC inside the receiver will disconnect the MOS, so that PV module will not output power. GoodWe offers three methods to turn off the transmitter.

 a. Turn off the AC switch between the inverter and the power grid.

 b. Turn off the DC switch at the bottom of the inverter.

 c. Press an external initiator like breaker or stop button which is connected with the inverter.

3.3.7 Load Control

The inverter integrates a Dry contact which can be connected to the contactor to control the loads on or off. If DO relay is off at inverter side, A1 and A2 of the contactor will connect to L and N, so that the contactor will be turned off. Then the load will connect to grid or inverter backup output port through the contactor.

3.3.8 Summary

Function	ET15-30K
PV String Current Monitoring	Integrated
PV Isolation Resistance Detection (ISO)	Integrated
Ground Fault Circuit Interrupter (GFCI)	Integrated
PV Reverse Polarity Protection	Integrated
Battery Reverse Polarity Protection	Integrated
Anti-islanding Protection	Integrated
AC Overcurrent/voltage Protection	Integrated
AC Short Circuit Protection	Integrated
DC Switch	Integrated
DC Surge Protection (SPD)	Type Ⅱ
AC Surge Protection (SPD)	Type Ⅲ
Arc Fault Circuit Interruption (AFCI)	Optional
Rapid Shutdown (RSD)	Optional
Remote Shutdown	Integrated
Load Control	Integrated

Ps: The complete article will be attached late this week.

 

 

 

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