APsystems
APsystems is a global solar-technology brand specializing in microinverters and other module-level power-electronics solutions.
Last updated October 9, 2026
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Overview
APsystems, formerly known as APS and also described as Altenergy Power System, is a renewable-energy technology company focused on module-level power electronics for photovoltaic installations. The company was founded in Silicon Valley in 2010 and subsequently established a joint venture and manufacturing operation in Jiaxing, Zhejiang, China. Its business centers on products that convert, manage, monitor, and safely shut down electricity generated by individual solar modules or small groups of modules rather than relying exclusively on a single centralized inverter. The brand's principal product categories include microinverters, rapid-shutdown equipment, energy-storage and hybrid-inverter products, communications equipment, and related system technologies. Its microinverter portfolio has included single-module, dual-module, three-phase, and four-module platforms intended for residential, commercial, and industrial photovoltaic projects. APsystems has also developed APsmart, a related brand focused on DC module-level power electronics and rapid shutdown, with an emphasis on electrical safety and compliance with North American requirements such as the National Electrical Code and SunSpec standards. APsystems expanded internationally during its first decade. It opened an Australian office in 2011, developed subsidiaries and distribution channels in North America and Europe, established a Netherlands warehouse, and later opened regional offices in France, Mexico, and other markets. The company reports activity in more than 100 countries and service coverage extending to more than 150 countries. Its regional presence includes operations in China, the United States, Canada, Mexico, Europe, the Middle East, Africa, Asia-Pacific, Australia, and New Zealand. The company entered the market with the YC200 single-module microinverter in 2011 and followed it with the YC500 dual-module platform in 2012. The YC1000, shipped from 2014, was positioned as an early three-phase microinverter capable of serving higher-voltage commercial applications. Later product generations included the YC500i, YC600, QS1, DS3, QT2, and EZ1 families. These products progressively addressed installer convenience, grid-interactive functions, higher output, independent maximum-power-point tracking, and balcony or do-it-yourself solar applications. APsystems changed its corporate name from APS to APsystems in 2015. It passed successive installation and shipment milestones, including more than 250 MWp installed worldwide in 2015, more than 550 MW by the end of 2018, more than 1 GW of cumulative microinverter shipments in 2020, more than 2 GW of shipments at the end of 2021, and more than 3 GW of module-level power-electronics shipments at the end of 2022. By October 2023, it reported more than 10 million interconnected units. The company has also reported millions of deployed units and substantial associated clean-energy generation. In June 2022, Yuneng Technology, the company associated with APsystems, became publicly traded on the Shanghai Stock Exchange under ticker 688348.SS. APsystems continues to broaden its offering beyond microinverters into storage, hybrid conversion, balcony solar, backup power, and battery-control products. Recent launches and warranty changes indicate an effort to compete on system integration, long product life, installer support, and bankability as distributed solar becomes more common in residential and commercial markets.
History
APsystems began in Silicon Valley in 2010 under the APS name, entering the renewable-energy market with a focus on module-level power electronics for solar photovoltaic systems. The company established a joint venture in Jiaxing, Zhejiang, China, where it developed manufacturing capacity. Its first major commercial product was the YC200 single-module microinverter, launched in 2011. That year it also opened an office in Sydney, marking the beginning of its international regional structure. In 2012, APS introduced the YC500 dual-module microinverter and began developing the YC1000-3, a three-phase product intended to address commercial and industrial applications. By 2013, the company had subsidiaries or operating structures in the United States, China, and Australia. It reported worldwide shipments of 80,000 microinverters by March of that year and was ranked by Greentech Media Research as the second-largest global microinverter supplier by shipments. APS also expanded distribution in the United States, opened a Netherlands warehouse, and entered the Benelux market. The company increased its presence in North American residential and commercial solar projects during 2014 and 2015. Its products were distributed in the Pacific Northwest and other parts of the United States, including through partnerships involving residential developments, community projects, installers, and nonprofit construction initiatives. In October 2014, APS began shipping the YC1000, described as a three-phase solar microinverter designed for 277/480-volt grids, with communications functionality and integrated grounding. In 2015, installed capacity surpassed 250 MWp. The company also supported educational and community solar projects through product donations. In September 2015, it changed its name from APS to APsystems. APsystems continued international expansion in 2016 and 2017, including a regional office in Lyon, France, and an office in Mexico. Installed capacity exceeded 300 MWp in 2016 and 400 MWp in 2017. The company worked on compliance with evolving rapid-shutdown requirements in the United States and introduced the YC500i, a dual-module microinverter designed for trunk-cable installations. In 2017 it launched the YC600, a dual-module smart-grid microinverter designed to comply with California Rule 21 requirements. Financing and distribution relationships with solar companies also broadened the availability of its products to residential installers. The QS1, a four-module 1,200-watt microinverter, was introduced in 2018 and began shipping to the United States in 2019. APsystems exceeded 550 MW of global installed capacity at the end of 2018 and 750 MW in 2019. In 2019, it also launched APsmart, a related brand focused on rapid shutdown and other DC module-level power-electronics products. By 2020, APsmart rapid-shutdown shipments had exceeded 100 million units according to the supplied reference material, while cumulative APsystems microinverter shipments passed 1 GW. In 2021, APsystems partnered with Yotta Energy on a low-voltage DualPower Inverter concept. It also introduced the DS3 dual-module, single-phase microinverter family for residential and commercial use. DS3 shipments to the United States began in February 2022. The company reported more than 2 GW of worldwide shipments at the end of 2021 and more than 146,000 solar installation sites in over 100 countries in 2022. In June 2022, Yuneng Technology, the publicly traded company associated with APsystems, listed on the Shanghai Stock Exchange. The QT2 three-phase microinverter was introduced in November 2022 for commercial and industrial solar projects. By the end of that year, APsystems reported more than 3 GW of cumulative module-level power-electronics shipments. The EZ1, introduced in 2023, extended the brand into balcony photovoltaic and do-it-yourself solar applications. The company reported more than 10 million interconnected units by October 2023. In 2024, it introduced the EZHI single-phase hybrid inverter for balcony photovoltaics and the ELS 11.4k PCS for higher-capacity power conversion and backup applications. In 2025, APsystems announced longer standard warranties for DS3 and QT2 products in the United States and Canada, introduced the QS2 quad microinverter and AHS battery hybrid controller, and received favorable bankability recognition from Sinovoltaics according to the supplied reference. The company now operates through a broad international structure spanning China, North America, Europe, Latin America, the Middle East, Africa, and the Asia-Pacific region, with a portfolio that extends from microinverters into rapid shutdown, storage, hybrid conversion, and backup power.
- 2025
QS2 and AHS introduced
[1]The company launched the QS2 quad microinverter and AHS Solar Battery Hybrid Controller series.
- 2024
EZHI and ELS products introduced
[1]APsystems introduced the EZHI hybrid inverter and ELS 11.4k power-conversion system.
- 2023
EZ1 launched
[1]The EZ1 microinverter extended APsystems into balcony photovoltaic and do-it-yourself solar installations.
- 2022
Shanghai listing and QT2 launch
[1]Yuneng Technology became publicly traded in Shanghai, while APsystems introduced the QT2 three-phase microinverter for commercial and industrial projects.
- 2021
DS3 series introduced
[1]APsystems presented the DS3 dual-module, single-phase microinverter family.
- 2020
Microinverter shipments pass 1 GW
[1]Cumulative APsystems microinverter shipments exceeded 1 GW globally.
- 2019
APsmart launched
[1]APsystems created APsmart as a rapid-shutdown and DC module-level power-electronics brand.
- 2018
QS1 introduced
[1]The company launched the four-module QS1 microinverter for residential solar systems.
- 2017
YC600 introduced
[1]APsystems introduced the YC600 dual-module smart-grid and Rule 21-compliant microinverter.
- 2015
Name changed to APsystems
[1]The company adopted APsystems as its operating brand and surpassed 250 MWp of worldwide installed capacity.
Products and positioning
A global specialist in distributed solar conversion and module-level power electronics, positioned around microinverter performance, system safety, installation flexibility, monitoring, and integrated energy storage.
Solar microinverters · 2011
YC series
The YC family established APsystems' early microinverter platform. It included the single-module YC200, dual-module YC500 and YC500i, and the three-phase YC1000. The products were designed to convert power close to the photovoltaic modules, support distributed maximum-power-point tracking, and provide alternatives to centralized or string-inverter architectures.
Smart-grid microinverter · 2017
YC600
The YC600 is a dual-module microinverter introduced for residential and light commercial solar systems. Its positioning emphasized smart-grid functionality, higher output than earlier APsystems platforms, and compliance with California Rule 21 requirements. The product represented the company's effort to adapt module-level conversion to increasingly demanding grid-interconnection rules.
Four-module microinverter · 2018
QS1
The QS1 is a residential four-module microinverter rated at 1,200 watts. It was designed to connect four photovoltaic modules through one inverter while retaining module-level power management. Introduced in 2018, it was later shipped to the United States and recognized by Solar Power World as a notable solar product of that year.
Dual-module microinverters · 2021
DS3 series
The DS3 series is a dual-module, single-phase microinverter family for residential and commercial photovoltaic systems. It is part of APsystems' newer-generation platform and was developed to support higher-power modules and contemporary grid requirements. The series began shipping to the United States in 2022 and later received a 25-year standard warranty announcement for the United States and Canada.
Three-phase microinverter · 2022
QT2
The QT2 is a three-phase microinverter aimed at commercial and industrial solar projects. It extends APsystems' distributed conversion approach to larger systems requiring three-phase electrical service. The platform was introduced in 2022 and was subsequently covered by the company's announced 25-year standard warranty in the United States and Canada.
Balcony and DIY microinverter · 2023
EZ1
The EZ1 is a microinverter family intended for balcony photovoltaic systems and do-it-yourself solar installations. Its introduction broadened APsystems' target market beyond conventional professionally installed rooftop systems toward smaller, more accessible distributed-generation configurations.
Hybrid inverter · 2024
EZHI
The EZHI is a single-phase hybrid inverter introduced for balcony photovoltaic applications. It reflects APsystems' move toward combining solar conversion with energy-storage functionality in compact distributed-energy systems.
Power-conversion and backup system · 2024
ELS 11.4k PCS
The ELS 11.4k PCS is a power-conversion system introduced with a nominal rating of up to 11,400 VA. Its stated peak backup capability is up to 17,100 VA for ten seconds, allowing it to support heavier loads in ordinary operation and during backup events.
Rapid-shutdown and DC MLPE · 2019
APsmart rapid-shutdown products
APsmart is APsystems' related brand for DC module-level power electronics, particularly rapid-shutdown products. The portfolio is designed to improve photovoltaic-system safety and support compliance with North American electrical-code and SunSpec requirements.
Quad microinverter · 2025
QS2
The QS2 is a single-phase quad microinverter introduced with a stated output of 2,200 watts. It supports four high-power photovoltaic modules through independent maximum-power-point-tracking channels, targeting higher-output residential and distributed solar systems.
Solar battery hybrid controller · 2025
AHS series
The AHS series is a Solar Battery Hybrid Controller family introduced as part of APsystems' expansion into storage-oriented power management. The supplied reference identifies the AHS-6.3 as one of the announced products.
Controversies
Marketing campaigns
- 2017Extend the Day partnership
International
APsystems partnered with Extend the Day, a charity distributing solar reading lights to schoolchildren in communities without reliable electricity.
- 2014Project of the Year awards
International
APsystems announced a project awards program highlighting photovoltaic installations using its products.
Brand decisions
2025
Longer DS3 and QT2 warrantiesOtherBackground
Long warranty periods are an important consideration for solar installers, financiers, and system owners evaluating equipment durability and bankability.
Action taken
APsystems announced a 25-year standard warranty for DS3 and QT2 microinverters in the United States, followed by the same standard term for those products in Canada.
Aftermath
The warranty change strengthened the products' long-term ownership proposition in two major North American markets.
2022
Public listing of Yuneng TechnologyOtherBackground
The APsystems business was associated with Yuneng Technology as it expanded its global solar-equipment operations.
Action taken
Yuneng Technology was listed on the Shanghai Stock Exchange under ticker 688348.SS.
Aftermath
The listing provided a public-market identity for the company associated with the APsystems brand.
2019
Expansion into rapid-shutdown MLPEStrategyBackground
Solar safety requirements and module-level electrical controls were becoming increasingly important in photovoltaic markets.
Action taken
APsystems launched APsmart as a focused brand for rapid-shutdown and related DC module-level power-electronics products.
Aftermath
APsmart became a second product identity alongside APsystems' AC microinverter business.
2015
Rebrand from APS to APsystemsStrategyBackground
The company was expanding its international operations and product portfolio under the APS name.
Action taken
It changed its name and international brand identity to APsystems.
Aftermath
Subsequent product launches and regional expansion were conducted under the APsystems name.
Recent events
- 2025
APsystems extends DS3 and QT2 United States warranties to 25 years[1]
Other
The company announced a 25-year standard warranty for the DS3 and QT2 microinverter series in the United States.
- 2025
APsystems introduces the QS2 and AHS product families[1]
Product launch
The company introduced the QS2 quad microinverter and the AHS Solar Battery Hybrid Controller series.
- 2024
APsystems introduces the ELS 11.4k PCS[1]
Product launch
APsystems unveiled a power-conversion system rated for up to 11,400 VA nominal output and higher short-duration backup power.
- 2023
APsystems introduces the EZ1 balcony microinverter[1]
Product launch
The EZ1 family was introduced for balcony photovoltaic installations and do-it-yourself solar applications.
- 2022
APsystems-associated Yuneng Technology lists on the Shanghai Stock Exchange[1]
Other
Yuneng Technology, associated with the APsystems business, became publicly traded in Shanghai under ticker 688348.SS.
- 2019
APsystems launches APsmart rapid-shutdown brand[1]
Product launch
APsystems introduced APsmart as a brand for DC module-level power electronics and photovoltaic rapid-shutdown products.
- 2015
APsystems changes name from APS to APsystems[1]
Other
The company adopted the APsystems name as its international brand identity.
Sources2 sources
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