Can I add batteries with a micro inverter?

Yes you can easily add batteries with micro inverters such as Enphase! You simply use a technique called "AC Coupling" where the batteries are connected directly into the 240V AC in the switchboard using an AC Battery inverter. Here's how it works:

Can You power micro inverters with batteries instead of solar panels?

To answer your question. Yes, you can power micro inverters with batteries instead of solar panels. I have a IQ7X powered off my 60 volt battery bank to take out my base load that doesn't go through my hybrid inverter. It flashes orange (orange means AC good but not connected to Envoy). It makes a constant 312 watts.

How does a 240V battery inverter work?

You simply use a technique called "AC Coupling" where the batteries are connected directly into the 240V AC in the switchboard using an AC Battery inverter. Here's how it works: As you can see, the output of the micro inverters is 240V AC and the Battery Inverter converts the battery's DC to 240V AC, so everything works together nicely.

Does a micro inverter need to be connected to a grid?

The micro inverter is designed to be grid tied. It needs to be connected to the grid in order to operate. It won't work. The micro inverter is designed to be grid tied. It needs to be connected to the grid in order to operate. It won't work. I think they are referring to using the battery on the input side of the microinverter.

How does a microinverter work?

The microinverter has no mechanism for adjusting the output to match the load like normal inverters do. It expects a grid which presents as an infinite load. It actually has a boot up sequence that tests for various characteristics of the grid including the presence of a 60 Hz waveform.

Does a Powerwall / hybrid inverter work with a battery?

Yes, a Powerwall or hybrid inverter contains the necessary hardware and software to time shift with batteries. OP can you confirm, is this what you are trying to accomplish? If the OP is trying to make 60Hz 120v electricity from a DC battery an inverter designed to do that is what he should use. A microinverter will not do that.