Re: Dumb question that I can't find the answer to
Let's say it's not a good idea.
Neither unit was designed to be connected that way.
Which is not to say that some haven't done it. If the power consumption is high enough, apparently, it can work. But remember that a GT inverter is designed to put out all the Watts it possibly can, and "assumes" any surplus not used by the house will be taken on by the grid. Whereas an off-grid inverter is designed to supply Watts according to demand, up to its maximum limit.
The SMA Sunny Boy is a special case: they actually make an additional unit that allows the GT inverter to "island" (look for SunnyBoy Island) and function as an off-grid inverter. Sort of. Basically it provides the necessary synchronization information the GT is looking for in the grid.
But as GT inverters periodically "test" for grid presence and those "tests" can wreak havoc on an off-grid inverter we're back to the original "it's not a good idea." You could burn up $4000 in inverter here.
Four 175 Watt panels, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.
Ohm's Law: Amps = Volts / Ohms
Power Formula: Watts = Volts * Amps