What G-TECH does

G-TECH Corp. (株式会社G-TECH) is a Japanese solar system integrator and EPC (Engineering, Procurement, Construction) company founded on January 15, 2014, by Shinichi Hirabayashi (Doctor of Engineering). Headquartered in Marunouchi, Tokyo, the company designs, develops, and sells off-grid lithium battery energy storage systems (BESS) for residential and medium-to-large commercial customers in Japan, with supplementary EPC operations in Taiwan via its wholly-owned subsidiary G-TECH Taiwan (established February 2020).

The company's core technology centers on a proprietary Battery Management System (BMS) and an off-grid architecture that prevents reverse current (逆潮流) to the grid, enabling true self-consumption of solar power rather than feed-in tariff sales. Its product portfolio comprises three lines: (1) Off-Grid — the flagship lithium battery system available in GTI-10 (10.0kWh) and GTI-16 (16.0kWh) variants, both JET-certified with 10,000-cycle life at 60% depth of discharge; (2) DC LINK — a DC-coupled solar-to-storage architecture; and (3) BESS — an industrial/commercial-scale storage solution with up to 9-unit parallel deployment. Four Japanese patents protect the off-grid architecture. Cloud-connected remote monitoring, modular 2kWh serviceable battery blocks, and IP65 outdoor-rated hardware support the maintenance-friendly design.

G-TECH generates revenue primarily through direct hardware sales (battery systems), recurring O&M services, and solar EPC project work. Distribution is direct via the corporate website (g-tech.tokyo) and inquiry forms, supplemented by a channel relationship with TEPCO Home TECH (which adopted the 'ZEROレジ' residential product in 2020) and customer financing partnerships with Mizuho Bank and Keiyo Bank. Pricing is not publicly disclosed. Registered capital stands at ¥92M (including ¥50M in reserves). The company won the 2021 Venture Club Chiba Business Challenge Contest Excellence Award and was selected for the METI SME Business Restructuring Subsidy in December 2021.

Name

G-TECH

Website

https://g-tech.tokyo

Company type

Private

Founded year

2014

Operating status

Operating

Short description

G-TECH Corp. is a Tokyo-based Japanese solar EPC and battery energy storage company (founded 2014) that designs, manufactures, and sells proprietary off-grid lithium BESS systems — including the 10kWh GTI-10 and 16kWh GTI-16 models — for residential homeowners and medium-to-large commercial facilities in Japan and Taiwan, with channel reach via TEPCO Home TECH.

Ownership category

akta.pro rank

Product category

Battery Energy Storage Systems

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600)

akta.pro primary industry

Battery Management Systems (BMS) & Safety Controls (EUAFAAAD)

akta.pro secondary industries

Residential / Behind-the-Meter Storage Installation & Integration (EUAEAEAC), BESS Operations, Maintenance & Asset Performance Management (APM) (EUAFAAAG), Battery Management Systems (BMS) & Pack Electronics Manufacturing (EUAFABAJ)

Keywords

• Off-grid battery storage
• Solar EPC services
• Battery management systems
• Energy storage systems
• Residential battery storage

Headquarters

HQ city

Marunouchi

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Technology or R&D, Personnel, Operations, Marketing or Sales

Revenue model

1. Solar EPC (Engineering, Procurement, Construction): Design, procurement, and construction of solar power generation systems.
2. O&M (Operations & Maintenance): Ongoing operations and maintenance services for solar and battery systems.
3. Off-Grid Battery System Sales: Sale of proprietary off-grid lithium battery systems (GTI-10 at 10.0kWh and GTI-16 at 16.0kWh) for residential and industrial use. Both models are JET (Japan Electrical Safety & Environment Technologies Laboratories) certified.
4. Off-Grid Battery Design and Development: Design and development of off-grid battery systems as a core product line.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

G-TECH Corp. designs, develops, and sells off-grid battery energy storage systems (BESS) with proprietary Battery Management System (BMS) technology, along with providing solar EPC (Engineering, Procurement, and Construction) services. The company offers three core product lines: Off-Grid (10.0kWh/16.0kWh residential battery storage), DC LINK (DC-coupled solar-to-battery system), and BESS (commercial-scale battery storage with cloud monitoring). The products target both residential self-consumption and 24/7 backup power for medium-to-large facilities such as hospitals, nursing homes, cold storage warehouses, schools, and apartment buildings.

Product overview

G-TECH Corp. is a SolarSystem Integrator and EPC (Engineering, Procurement, Construction) company specializing in battery energy storage solutions. The company's product portfolio consists of three core offerings: (1) Off-Grid — the world's first off-grid battery storage system with up to 16.0kWh capacity and 10,000W maximum discharge; (2) DC LINK — a DC coupling system for optimized solar-to-battery energy transfer; and (3) BESS — a comprehensive battery energy storage system with cloud-connected remote management capabilities. These products work together as an integrated energy solution enabling residential and commercial self-consumption of solar power without grid export.

Differentiator

Problem solved

Functional benefit

Brands

• Off-Grid: G-TECH's flagship off-grid battery system product line, featuring residential models up to 16kWh capacity with world-first off-grid lithium battery technology. Targets self-consumption energy users and disaster-resilient power needs.
• DC LINK
• BESS

Products and services

• Off-Grid Battery Storage System Flagship off-grid battery storage system designed for residential and small commercial solar self-consumption and backup power. Available in 10.0kWh (GTI-10) and 16.0kWh (GTI-16) capacities with proprietary BMS and JET certification. No reverse current to grid simplifies regulatory compliance.
• DC LINK System DC-coupled solar-to-battery energy transfer system that optimizes photovoltaic energy routing into battery storage. Designed for integration with G-TECH Off-Grid batteries and solar PV installations to maximize self-consumption efficiency.
• BESS (Battery Energy Storage System) Comprehensive commercial-scale battery energy storage system with cloud-connected remote management for 24/7 power supply at hospitals, nursing homes, cold storage warehouses, schools, and apartment buildings. Scalable architecture using parallel-connected 16.0kWh units.
• Solar EPC (Engineering, Procurement, and Construction) Services End-to-end Engineering, Procurement, and Construction services for solar PV and battery storage installations, serving both residential and commercial/institutional customers. Provided as an integrated delivery service alongside G-TECH's battery products.
• Operations & Maintenance (O&M) Services Ongoing Operations & Maintenance services for installed G-TECH battery storage and solar PV systems, leveraging the cloud-connected monitoring platform to support uptime and performance for facility operators.

Quantifiable outcome

• 16.0kWh maximum battery capacity — largest among residential models in Japan
• +2 more outcomes

Named customers1 record

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Three partnerships are on record, tiered core.

• TEPCO Home TECH (TEPCOホームテック)coreChannel Partner/ Reseller/ Distributor · 1 January 2020TEPCO Home TECH officially adopted G-TECH's 'ZEROレジ' off-grid battery system. This represents a significant channel partnership with Tokyo Electric Power's home services subsidiary, enabling wider market distribution.
• Lux PowercoreTechnology or IntegrationLux Power is G-TECH's industrial equipment partner, with key contacts James Wang (CEO) and Grace Xia (COO). Lux Power is a partner in the development of G-TECH's industrial and off-grid battery systems.
• DynesscoreTechnology or IntegrationDyness provides technical leadership as Off-Grid CTO partner, with contact Aaron serving as Dyness CEO. Strategic technical partnership for off-grid battery system development.

Scale indicators4 records

Recent moves7 records

Expansion highlights6 records

Direct peers

• Enphase Energy: US-listed residential energy technology company selling microinverter-based solar-plus-storage systems (IQ Battery) with proprietary battery management and cloud monitoring — comparable to G-TECH's BMS-centric DC-coupled architecture targeting the same homeowner buyer.
• SolarEdge: Provider of residential solar inverters and a DC-coupled battery (SolarEdge Energy Bank) with integrated BMS and module-level optimization, closely mirroring G-TECH's DC LINK + proprietary BMS approach for residential and small-commercial customers.
• Tesla Energy (Powerwall): Tesla's residential storage product (Powerwall) targets self-consumption, backup, and time-of-use optimization in a small wall-mounted form factor. Direct functional overlap with G-TECH's Off-Grid system in the residential behind-the-meter segment.
• Tabuchi Electric: Long-established Japanese manufacturer specializing in residential lithium-ion storage systems (Epalock series). Competes with G-TECH in the same Japanese household BESS market and benefits from similar FIT-sunset and disaster-backup demand drivers.
• Kyocera: Japanese electronics and solar company producing rooftop PV modules and residential energy storage/EMS solutions. Competes with G-TECH in Japanese residential solar-plus-storage installations and benefits from the same FIT-sunset narrative.
• sonnen (Enphase): German-origin residential and small-commercial BESS brand (now part of Enphase) that helped pioneer the self-consumption / off-grid residential storage category in Europe and is expanding into similar markets in Japan and Asia-Pacific.
• Nichicon: Japanese power electronics and storage specialist selling residential lithium-ion BESS under the '蓄vision' brand. Direct Japanese competitor to G-TECH's Off-Grid line for self-consumption and disaster backup use cases.

Broad incumbents

• Panasonic: Japanese battery and storage giant offering residential BESS (e.g., 'evervolta' / 'ejit' lines) and supplying cells to global EV OEMs. Overlaps with G-TECH on behind-the-meter storage but competes from a much broader portfolio of consumer and industrial energy products.
• BYD Energy Storage: Global battery and BESS conglomerate (Battery-Box residential line plus large utility-scale systems) with deep China manufacturing scale. Comparable to G-TECH as a vertically integrated residential BESS player with proprietary battery and BMS technology.
• Sungrow: One of the world's largest solar inverter and BESS manufacturers, with a broad residential through utility-scale storage portfolio (including hybrid inverters for self-consumption). Indirectly comparable to G-TECH given Lux Power / Dyness ties to the China BESS ecosystem.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights7 records

Customer concentration

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about G-TECH