Can AT1 throttle output of panels with Enphase IQ8 microinverters

I have a Bluetti Apex 300 with 3 B300K expansion batteries. I just had a rid-tie solar system installed with 26 panels equipped with Enphase IQ8 microinverters and an IQ Combiner 5C. I’d like to purchase an AT1 to tie everything together. I Have two questions:

  1. Will the AT1 throttle the output of the microinverters if the grid goes down, the batteries are fully charged and the panels are producin more power than I need?
  2. The AT1 user manual shows a HUB A1 between the Apex300 and the AT1 even when there is only one Apex 300 connected. Why is this needed?

Chris

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Is there no one from Bluetti that can answer this? I have an AT1 and an SMA sunnyboy inverter than I plan to tie into the AT1 with 2 APEX hopefully this will work and will allow the solar to produce with no power… Otherwise it’s kind of a pointless purchase…

This doesn’t help with the SunnyBoy inverter but I was told by someone from Enphase that the IQ8 microinverters don’t use the frequency shifting to throttle the inverters the inverters are supposed to be able to sense the load and automatically throttle when the load drops and full power is not needed. Again this is when the grid is down so the excess power can’t be sent to the grid and the battery is full so it can’t be sent there either.
I still haven’t received a response regarding the need for the Hub A1 but I went and ordered on anyway. I’m going to but it in just in case I want to add another Apex300 later.