question

When the AC input is present and within specifications (voltage, frequency, stability). The AC input relay closes and power from the AC input becomes available at the AC output(s). The inverter an assist this passthrough of power if the incoming AC isn't sufficient.

For a generator, you want to enable wide frequency and possibly increase the acceptable AC voltage range for the AC input.

You also want to set the AC input current limit so the generator isn't overloaded.

Thanks evrybody.
In fact , configuring offgrid systems that most of the time run below Nominal Inverter Power, when load demand extra power that exceeds Nominal Inverter Power but still is below maximum Transfer Switch Power spec, I understand that bypass switches ACin with ACout1, declining Power Assist when SOC% is very low. When loads request far more power than can be provided by Multiplus 2, not only as inverter but as bypass, and assuming Generator has the capacity to serve this high loads, an external bypass should be needed, with the negative impact of a short blackout period, that should be minimized.
If there is experience on this scenarios, welcome to post.

Making a twist in my question about transfer switch power serving scenarios.

In MP2 datasheet shows 4KW maximum Inverter Power (220 Volts x 18 Amps), and 11 KW for Maximum Transfer Switch Power (220 Volts x 50 Amps)

So question is: When ACout1 loads exceed Inverter Maximum Power 4Kw, but still are below Internal Transfer Switch specs 11 Kw, means that Load scenario can be served entirely by ACIn1 Power and Inverter can be stopped during heavy demands short periods (less than one or two hours bypass) of power shuting inverter off but still charging batteries? Is there any Assistant that can make Inverter shut down instead of power assiting when load is higher than X amps load current? And still charge batteries from grid or generator?. I see that with VE-config in the Inverter section is possible to shutdown inverter on SOC conditions (needs to enable battery monitor, normaly disabled in my cas I use Cerbos). Is not 100% what I need (disabling inverter under load power conditions when Grid is present) but should be a shortcut in case there is no other.

Hope need is more clear now.

Question relates to my MP2 instalations, but also apply for my Quattro instalations

What you describe is exactly how the system works. AC loads are satisfied by available AC input until the AC input current limit is reached, then power assist kicks in to add additional power to the loads while keeping the AC input current below the set value.

If the AC output load is below the AC input current limit, the additional power on the AC input will charge the batteries.

Lets say your loads are 10 amps and the input current limit is set to 15 amps. Then all load power is supplied to the loads. If the batteries need charging, then 220 x 5 = 1100 watts is available to charge the batteries.

If the load increases to 18 amps, then the input current will max out at 15 amps and the remains 5 amps (660 watts) will be drawn from the batteries. The batteries will not charge in this condition.

Thanks Kevin
But..., the scenario I tried to describe is the opposite. The load at certain moment , for a couple of hours a day is 8Kw, above than maximum Inverter spec, lets say MP2 (48 Volts 4KW) @ 220 volts x 18 Amps=4Kw, but below the maximum Transfer Switch Power, for MP2, that according to spec 220 volts x 50 Amps=11 KW normal for bypass.

Grid or Generator supports more than 15 KW. So there is not a case por Power Assist, because it is not needed nor desired. Power Control is enabled to achieve smooth ACin1 during the transient period.

The point is to find a way to disable Inverter during this extra load Power demand when Grid or Generator is available, and still keep grid charging bateries.

I see that we can disable inverter @ SOC% in Inverter Section, but this feature works with or without ACin1 available. That is not what we need.

I was rather looking for disabling inverter through an Assistant when load was above maximum and ACin is available, so batteries are not discharged, as is the case when Power Assist