The Solar Edge SE6000A-SE is a "Grid Tie" inverter. It requires a solid power waveform for 5 minutes before it will produce power. So by itself, it will not function without a stable "grid".
With that being said, there is a way to make it work. You will need to add a battery based inverter that is powerful enough to control the voltage and frequency to produce a local "grid". Is the Solar Edge system already up and running on grid and you want to take it off grid?
I saw Amy's post pop up as I am typing this. altE store is a great resource, and I am now a customer of sorts.
If the Solar Edge system is not currently functioning, don't bother trying to use it off grid. Just get a hybrid or off grid system from the beginning, it will be simpler to setup and likely won't even cost much more. If you get something like an OutBack SkyBox, or Sol-Ark, you can even hook your solar panels right into it, add a battery bank, and be good to go. If you are updating an existing system, you need to make the inverter think you have a grid. Your new battery based inverter needs to be larger than the grid tie one, some want a 20% margin to ensure it can control the current. I am adding a Schneider XW-Pro which is rated at 6800 watts. My current grid tie system is under 4000 watts so I know I am good there, but it will be borderline for the SE6000 you have. How much solar is connected to it? Even if it is less, the fact that the inverter CAN put out 25 amps at 240 volts could make it overwhelm the 6800 watt battery inverter. If it starts pulling the voltage out of range, the whole system will shut down.
And now I see your reply. So you don't have the SE6000 running.
Even for free, it does not save you much if you are building an off grid setup from scratch. The cost of an inverter that will fake it into working AC coupled will cost about the same as a new hybrid on it's own. The Schneider route also works, but the solar charge controllers are an extra cost. How much power do you need? How much storage for power without sun?
