The moderator doesn't take well to criticism? ...
Nah, love criticism. Criticism is invaluable as it points out weaknesses/flaws; you can never have enough critics! Your post wasn't deleted for criticizing the moderator or the idea, in fact your post didn't criticize anything. It was just a repeat of post #45. Saying the same thing over in a thread without providing any additional thought/evidence/references is considered spam, it adds nothing to the conversation. That's why your post was deleted, apologies if the note explaining why it was deleted was insufficient explanation.
... the DC - battery - with - inverter - system called "AC battery".
It's not like I coined the term, don't blame me the term entered the vernacular. Even what you call a DC battery is a "system" comprised of cells. A battleborn battery for example is a series of LiFePO
4 cells, temperature sensors, and a BMS. An AC battery just adds two more components, and inverter and a charger. But, by doing so removes the pains discussed in i
ncrementally adding DC batteries (and adds a few of its own pains).
...l My question is how do combined inverter generators, such as two Honda s, work...
AFAIK, inverters and inverter gasoline generators that can synchronize the AC output use a "parallel" feature. Electrically behind the scenes a wire between them let's the inverters stay in phase.
This would be a great idea for someone building their own and not needing to interact with the grid or an existing AC battery as those devices already exist. The real question, as the op says, is how can we mix/match AC batteries from different vendors or build our own DIY version?
The grid doesn't have a "parallel" feature or a specific timing wire. But overall the concept is the same and obviously every GT inverter must match the frequency of the grid so must have a way to sense the existing frequency.
With a Tesla system you can add more Tesla AC batteries...they know how to talk to each other. Same for Enphase. Each of those companies has done the engineering and can handle the frequency shifting from CA Rule 21; but to add more battery capacity AFAIK you're locked into their product. That might not be true, any grid-tied AC battery should work together without solar. But I don't see how they can work
well together without communicating with solar...someone has to be the master to set frequency curtailment and the other AC batteries need to follow.