The GoodWe GW-DT series are three-phase grid-tie inverters designed for reliable operation in residential and small to medium-sized commercial installations. The key advantage is the dual MPPT, allowing independent management of two string configurations - a significant benefit for roofs with different orientations, multiple pitches, or partial shading, as the system better optimizes energy yield under varying conditions.
High European efficiency is also practical - meaning performance in typical operating conditions encountered in Poland, translating to more predictable energy production throughout the season, not just at an ideal laboratory point. Daily monitoring is supported by an extensive system in SEMS (application and portal), with communication via WiFi, and depending on the configuration, also via LAN or RS485.
These are not hybrid inverters, so they are not intended for direct use with energy storage systems. They typically include the required certifications and compliance with grid connection standards, as well as the manufacturer's standard warranty.
Ranking
Specifications
Pros and cons
GoodWe is listed on BNEF's Tier 1 Power Inverter Manufacturer list for Q2 2025, with over 100 GW of installed capacity worldwide. This status signifies acceptance by commercial banks for non-recourse projects and translates into assurance of service and availability of spare parts over a 10+ year period.
The GW-DT series features two separate power tracking points, which allows for independent optimization of strings in areas with different orientations or partial shading of a single string - a real benefit in typical Polish rooftop installations with multiple strings.
The measured European efficiency of 97.6% (for the GW4K-DT_G2 and GW8K-DT_G2 models) is a strong result for this price range. The maximum efficiency of 98.3% confirms that the performance is not limited by conversion losses under typical operating conditions in Poland.
The SEMS (Smart Energy Management System) platform is available without a subscription, with a built-in WiFi module in each device - unlike, for example, SMA, where a communication sensor/gate is often an additional cost. Integration with RS485 and LAN is also available in selected configurations.
The series includes models ranging from 4 kW to 25 kW within a single product ecosystem, allowing the use of the same monitoring software and service procedures for both prosumer installations (approximately 5-15 kW) and small commercial facilities - simplifying selection and maintenance for installers.
The standard manufacturer warranty is 5 years, while SMA (Sunny Tripower) and Fronius (Symo Gen24) typically offer a standard 10-year warranty on the European market without any additional cost. GoodWe's extended warranty of 10 years is possible, but requires an additional payment, which increases the total installation cost by several hundred zlotys.
The GW-DT series consists of pure grid-tie inverters without the ability to connect to batteries. If a decision is made to expand the installation with a battery, the inverter needs to be replaced with a hybrid model (e.g., GoodWe ET/ES), which incurs additional costs and generates waste - a significant limitation given the growing interest in energy storage in Poland.
Alternatives
About the GW-DT series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.