Hi everybody and greetings from Germany. I’m planning to hook up a AC500 & B300S to my home grid to prepare for power outages that are bound to happen this winter. I have a solar roof (AC output only). Has anyone tried this before, using the USV functionality, and what sort of additional hardware do I need? Many thanks.
I am currently planning to do the same with an AC300.
This is my idea:
I want an electrician to install an emergency power switch (EATON UMSCHALTER, T0, 20 A) and then feed with a CEE plug with the L1 bridged to l2, l3.
Power devices that require three phases must then be switched off before.
I’m also from Germany and have an AC200Max + B230 up and running. I charge it from the solar roof when there is power left controlled by suny homew manger and two switchable plugs.
I installed with a 2 way relay an automatic switch between main power and Bluetti together with a 220V monitoring unit. You need to switch neutral as well, as the Bluetti is a kind of isle supply. You loads must be complete disconnected from the main when you power it from Bluetti. I would also put additional a 10A fuse between Bluetti and your load, just to be sure.
You need to be a electrian to be be able to install it in Germany, there is no ready to use solution.
Michael
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German Youtuber “Proofwood” has some great tutorials explaining the AC300-to-home grid connection.
You probably know that only a certified electrician is officially allowed to make the install…
Let’s hope for the best this winter! 
Proofwood is good, but questions still remain. I’m pondering whether interested members of the Bluetti community could collaborate to hire an electrician to create a sample wiring diagram, complete with materials list and installation instructions, for specific scenarios (e.g., AC500 for backup power, AC500 as a buffer battery for an AC-managed PV system, an AC500 that does both). That would make things easier for my local electrician, who may not have the experience.