My setup is off-grid, I have two Victron Phoenix 24-3000 in parallel and a battery bank that has some Victron MPPT solar chargers that charge the batteries from their own solar panel arrays. Recently, I am working on integrating a SMA SunnyBoy PV-AC inverter with its own solar panel array. The SunnyBoy has its own frequency shift feature to work in stand alone, off grid mode. However when it was connected, it soaked up all my AC loads, and the Victron Phoenix on my Victron APP is showing -700W ( 30 Volts @ 23 amps) and the solar charge controllers went into float, because they are seeing the batteries charged at their float voltage. So, I had no idea that a Victron Phoenix 24-3000 could operate as a charger when excess PV generated AC is in the AC out side. Or is this some kind of malfunction?
After some investigation using VE-Configure, it seems that what I thought were “inverter only” Phoenix 24-3000 units can also do charging ?!? using excess AC power being injected by a normal grid tie PV inverter attached to the AC output, that has no actual grid tie. When I went to add PV inverter assistant, to manage the PV inverter supplying excess power, the dialog said that it was not necessary, implying that once charging function is activated, PV inverter management is added by default ?!?