I never had any issues with the Sunsynk, I had the model with the old Solarman dongle, with limited inverter control functionality, I am not sure re the new dongle or application.

The Solis app has a great interface and many options for controlling your inverter settings.

I really like how quiet the Solis operate and the better PV and many other features you can read about.

Their prices are also pretty similar.

Hello Everyone, I am pulling this review out of the archives for good reason. It is now almost 3 years later, and my long-term experience with the Solis S6 Pro inverters has been nothing but a pleasure.

These machines are incredibly reliable and robust in every aspect. I have run my full household completely off-grid on these inverters. Previously I used a Sunsynk that simply could not handle the punishment in a true off-grid scenario.

On a single 6kW unit I have successfully run:

• Electric lawnmowers, chainsaws, angle grinders

• Oil bath & inverter welders

• Borehole pumps, drills, impact hammer drills, circulation pumps

• Base load of 6 fridges/freezers, air fryer, microwave, electric geyser 2kW element, CCTV 8 cameras, computers, TV, sound system, external LED lights

• 12,000 BTU aircon (winter and summer)

I regularly pushed the inverter to its limits and used the 200% surge capacity for short bursts. All of this with zero noise from the inverter.

Other successful tests:

• Generator integration Grid and Aux port works flawlessly and allows precise throttling of generator power draw.

• 2kW wind turbine on MPPT (constant voltage mode) and AC-coupled on Aux/backup port. Solis even created a special firmware to improve charging range. Their strong grid-forming capability makes them compatible with sensitive wind grid-tied inverters where others fail.

• Parallel operation: Added a second 6kW unit one dedicated to PV, one to wind.

• One unit was damaged during extreme experimentation Solis promptly replaced it under warranty. Their after-sales, technical support, and swap-out policy is second to none.

The Micro-Grid capability is absolutely amazing.

Internal transfer losses are almost zero.

I am deep into the experiment right now and will soon be adding a Solis 4.6kW grid-tied inverter into the micro-grid for further testing of TOU functions, charge and discharge rates, etc.

Their new Energy Management System (EMS) soon to be fully AI-powered makes perfect sense for grid-connected systems, from residential all the way to commercial solutions. It lets users set up Peak, Normal, and Off-Peak rates linked to intelligent charge and discharge schedules.

This maximises financial returns by optimising when to charge from the grid or solar, when to discharge to the loads, and when to export.

The upcoming self-learning AI mode will take it even further by automatically predicting solar generation, learning your actual consumption patterns, and making real-time decisions with minimal user input a big step forward for effortless optimisation. Up to this point I can only applaud Solis for a true Tier 1 product in every aspect.

The ability to create a micro-grid with their Hybrid inverters opens up huge potential for users who have multiple houses or buildings on the same property, with distributed batteries, inverters, PV, generator, or wind power systems all running seamlessly together on the same micro-grid.

Firmware upgrades are mostly for new features and battery compatibility.

The system has been so stable I went over a year without updates at times true “install and forget” performance in normal use.

I am now running an 8kW Solis Pro as the grid-forming master for my 6kW Solis Pro using CT clamp from the 6kW on the 8kW backup output. Each has its own battery bank and power source.

I am also planning a formal review of the Solis 5kW Off-Grid models soon.

Strong note: these are currently the only off-grid inverters that are NRS certified. We will be asking Solis for some units to give away.

Highly recommended!