As one of the leading off grid solar inverter manufacturers, FRECON offers the best off grid power inverter that combines a clean sine wave output with advanced MPPT tracking, smart battery management, and customizable power source prioritization.

Pure Sine Wave Output

As a pure sine wave off grid inverter, the SP520 PLUS operates independently from the utility grid,  

delivers a clean, stable sine wave output.

Built-in 100A MPPT

As a solar inverter off grid solution, the SP520 PLUS features an integrated 100A MPPT that intelligently tracks sunlight to extract maximum energy from PV panels.

Wide PV Input Range (120–500VDC)

The wide PV input voltage range allows the inverter to accept solar panels with a broad voltage range.

It enables more panels to be connected in series, thereby reducing wiring complexity and costs.

Dry contact output

This feature of the inverter grid off allows for reliable and safe electrically isolated operation, preventing interference from external devices such as alarms, generators, fans, or other control systems without directly supplying power.

Battery & AC/Solar priority via LCD setting

Our SP520 PLUS solar inverter off grid equipped with a user-friendly LCD, allows quick switching between battery, solar, and AC/grid priority modes. In unstable grid areas, the inverter ensures a reliable power source from solar or battery energy first.

Battery equalization for extended life cycle

Uneven battery wear shortens system life and increases maintenance costs, while our SP520 PLUS is a type of off grid solar inverter with battery. It automatically balances battery cells, prolonging lifespan and ensuring consistent performance.