String Inverters and Medium-Voltage Switchgear Target Grid-Ready Storage 

LS ELECTRIC America will present its AiON-SIS air-cooled string inverter, MSSP GEN 2.0 liquid-cooled string inverter and MCSG metal-clad switchgear at RE+ 2026, held 17–19 November at the Las Vegas Convention Center in Las Vegas, Nevada (Booth N2420). The three products cover power conversion and medium-voltage distribution for battery energy storage systems (BESS) and renewable-energy plants, from commercial installations to utility-scale projects.

String Architecture for Energy Storage Power Conversion
Energy-storage projects need power conversion systems that match the size of each battery block and meet utility interconnection requirements. A string-inverter architecture divides conversion into smaller units, which lets project teams size power blocks more precisely, simplify plant layouts and scale capacity from kilowatt-level systems to multi-megawatt installations. Both LS ELECTRIC America inverter platforms follow this approach and are intended for containerised and skid-based energy-storage and renewable-energy systems.

AiON-SIS Air-Cooled String Inverter
The AiON-SIS is a modular power-conversion platform for utility-scale and commercial energy storage, available in 116 kW and 140 kW ratings. It accepts a DC input range of 620–1500 VDC and offers AC output options of 400, 480 and 600 VAC. Maximum efficiency is above 98.5%, and CEC weighted efficiency is above 97.9%.

MSSP GEN 2.0 Liquid-Cooled String Inverter
For higher power density, the MSSP GEN 2.0 uses liquid cooling and is available in ratings from 150 kW to 220 kW. It supports a 1050–1500 VDC input range and 480, 600 or 690 VAC output, and is designed for compact megawatt-scale power blocks and integration into medium-voltage collection systems. Maximum efficiency is above 99%, with CEC weighted efficiency above 98.5%, which reduces conversion losses over the life of a storage project.

Grid-Support Functions
Both inverter platforms support four-quadrant operation, meaning they can import or export both active and reactive power, together with autonomous voltage and frequency regulation. These functions allow storage plants to provide active and reactive power support to the grid and help developers meet evolving interconnection and grid-support requirements set by utilities.

MCSG Metal-Clad Switchgear for Medium-Voltage Interconnection
The MCSG metal-clad switchgear handles medium-voltage power distribution, protection and interconnection. It is available in arc-resistant and non-arc-resistant configurations from 4.76 kV to 38 kV and includes UL-listed and ANSI/IEEE-aligned versions. Arc-resistant configurations are designed to protect personnel during an internal arc event, while the compact design helps make efficient use of electrical-room space.

In energy-storage and renewable-energy projects, MCSG can be used for medium-voltage collection, switching, protection and the interconnection between project assets and the utility grid or site distribution system. Combined with the string inverters, this gives developers equipment from a single supplier across the path from power conversion to the point of interconnection.

Additional Context
This section details technical specifications and competitive benchmarking not included in the original news release.

CEC weighted efficiency, defined by the California Energy Commission, averages an inverter's efficiency at several load levels (10%, 20%, 30%, 50%, 75% and 100% of rated output), so it reflects typical operation better than peak efficiency alone. A comparable product for the North American energy-storage market is the CPS ECB200KTL/US-800 from Chint Power Systems, a 200 kW, 1500 Vdc air-cooled storage string inverter. According to its datasheet, it operates from 950–1500 VDC with an 800 VAC output, and lists a maximum efficiency of 98.0% and a CEC efficiency of 97.0%. By comparison, the air-cooled AiON-SIS is rated at lower power per unit (116–140 kW) but lists higher efficiency figures (above 98.5% maximum and above 97.9% CEC) and a wider DC input range starting at 620 VDC, while the liquid-cooled MSSP GEN 2.0 reaches up to 220 kW per unit with efficiency figures above 99% maximum and above 98.5% CEC.

Edited by Aishwarya Mambet, Induportals Editor, with AI assistance.