Off-grid photovoltaic inverter lithium battery energy storage manufacturer

In today’s wave of global energy transition, ONESUN, founded in 2014 as a professional solar (PV) and energy-storage manufacturer, has built deeply integrated and highly reliable off-grid solar inverter + lithium battery storage solutions. With a dual-factory layout focused on both inverters and batteries, ONESUN covers all core manufacturing segments including battery cells, BMS, inverters, and PCBA.

All-in-One Solar System

1. Core Advantages: A Fully Integrated Manufacturer with Dual Control of Quality & Cost

ONESUN operates its own lithium battery factory and inverter factory, enabling complete vertical integration of the battery and inverter supply chain.

Its batteries use high-quality LiFePO₄ (lithium iron phosphate) cells, known for excellent safety and long cycle life.
The intelligent BMS (Battery Management System) comes from an automotive-grade engineering team (previously serving BYD), capable of automatically recognizing inverter communication modules for enhanced system stability.

Off-grid photovoltaic inverters and lithium battery energy storage

2. A Diverse Product Line for Multiple Off-Grid Scenarios

For off-grid applications, ONESUN offers a complete off-grid solar kit, including solar panels, lithium battery storage, pure sine wave inverters, and accessories.

Battery product options include wall-mounted, rack-mounted, floor-standing, and high-voltage stacked formats to suit various capacities and installation spaces.

Its inverters range from single-phase and three-phase hybrid models to high-frequency and low-frequency industrial types, supporting residential homes, small microgrids, and industrial off-grid systems.

Off-grid photovoltaic inverters and lithium battery energy storage

Product Name	Model no.	Specifications	Warranty
Solar panels	SUNIZE 550P- 144M	550W(8-10pcs)	10 Years
All-in-one	WSH 6KW-51.2V100ah	6KW hybrid inverter 5.12kwh*2pcs lithium battery	inverter 2 Years battery10Years
Accessories	PV1-F1*6mm²	10 meters PV Cable, MC4 connector	10 Years

3. Strong Technical Capabilities: High Reliability & System Integration

ONESUN’s R&D team originates from automotive battery and BMS backgrounds, bringing years of engineering experience.
Key inverter components—such as IGBTs from Infineon and MOSFETs from Toshiba—are sourced from leading global brands to ensure high reliability.
The company also owns independent intellectual property, including core technologies for three-phase hybrid inverters, and holds certifications in multiple countries.
Its BMS is designed for a service life of more than 10 years, ensuring the long-term stability of off-grid energy systems.

4. Value of ONESUN’s Off-Grid Solutions: Safer, Easier & More Flexible

* Simplified installation & deployment: Integrated off-grid solar kits eliminate the need for multiple suppliers—customers benefit from one-stop purchasing and faster installation.

* High safety: LiFePO₄ chemistry provides excellent thermal stability, combined with an intelligent BMS to ensure reliable performance even in harsh environments.
* Flexible expansion: Modular battery design and diverse inverter options allow systems to scale easily, from small homes to microgrids.

* Cost efficiency: With fully in-house manufacturing of both batteries and inverters, ONESUN maintains strong cost control and provides highly competitive solutions.

Off-grid photovoltaic inverter and lithium battery energy storage manufacturer

5. Global Service Network & Project Experience

ONESUN has strong manufacturing capacity (annual production capacity of 768 MW+) and a global vision. Its products have been exported to more than 70 countries, with over 3 GW of cumulative energy-storage projects delivered worldwide.

The company provides personalized consulting services to tailor off-grid solutions based on local needs, ensuring fast delivery and reliable support.

For users seeking a truly off-grid, reliable, economical, and technologically mature solar-plus-storage system, ONESUN delivers a highly competitive solution.

Its vertical integration, comprehensive product ecosystem, high-safety lithium battery technologies, advanced inverters, and extensive global project experience form a trustworthy and high-quality off-grid energy brand.

Off-grid photovoltaic inverters and lithium battery energy storage

Customized Lithium-Ion Batteries For Different Applications

According to your application field, diverse standard Power/Energy batteries will be provided to you for easy purchase directly.

Furthermore, if you can't find any ready models that fit your application, no worry, OneSun also can supply a FREE customize service.

As a professional lithium battery factory, we have an efficient and unity engineering team for fast lithium battery deep customization.Including Industry Energy Storage System, Power wall, Stackable Battery，All In One battery, Power Batteries for Electric Vehicles (Golf Cart/Motorcycle/E-bike/E-Scooter, etc).

Whether for remote households, microgrids, emergency relief, or outdoor applications, ONESUN’s solutions empower customers to achieve autonomous power generation, continuous electricity supply, and meaningful energy savings.

all in one solar system