Off-grid inverter plus energy storage

That's why hybrid inverters are now a central component of modern off-grid designs. A good hybrid inverter doesn't just convert electricity. It coordinates your entire energy ecosystem, integrating solar, batteries, and backup generators into a single, intelligent system.

The grid inverter functions in two modes: as a front-end rectifier when transferring power from the grid to the battery, and as a voltage source inverter when feeding power from the PV/battery back to the grid. It incorporates a full-bridge PWM inverter with an LC output filter to inject synchronized sinusoidal current into the grid.

At the heart of any resilient off-grid setup lies a crucial decision: how you manage, store, and distribute the energy you generate. Most conversations about off-grid systems focus on solar panels or battery storage. But the inverter—the technology that sits between generation, storage, and usage—is where everything comes together.

This white paper presents a hybrid energy storage system designed to enhance power reliability and address future energy demands. It proposes a hybrid inverter suitable for both on-grid and off-grid systems, allowing consumers to choose between Intermediate bus and Multiport architectures while minimizing grid impact.

The multiport structure shown in Fig.4 features a three-port converter and a bidirectional grid inverter. The primary function of the three-port converter is to enable single-stage power conversion, which integrates MPPT for PV systems and manages the charging/discharging of batteries with minimum BOM and improved power conversion efficiency.

Take Sunsynk's hybrid inverters as an example. They're built as all-in-one systems that let you generate, store, and manage energy from a single unit. Whether you're powering a remote cabin, a homestead, or an agricultural operation, this integrated approach reduces installation hassle and improves long-term reliability.