I‘ve just installed an MP2 GX 5000 but I can use it for max. 3680 VA or 16 A / 230 V due to cable restrictions. I made already a test using a B 16, but this tripped as soon as the first relay in the inverter started clicking, although there was no load (battery) connected. Now I am quite confused what happened, and if e.g. a C16 MCB would be sufficient, or if I have to use a higher value, such as 20 A or even 25 A? And which characteristic is feasible?
A category ‘C’ should be sufficient because the enormous current when switching on often causes a ‘B’ to trip.
‘C’ is for higher starting currents … should therefore be sufficient
But a C16 is already pretty close to the limit
If the supply line is large enough, a C20 would be a natural choice. This would be better suited to a continuous load of approximately 3600W.
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I‘ve used a C16 now, and it works fine. I will stay below the 16 A , probably 15 A - and this never very long, so it should not cause problems. I‘m using a high quality MCB from Siemens 
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please calculate the required tripping curve and select the appropriate braker local regulations can help.
It’s not recommended to start the MultiPlus without a battery.
The high inrush current to charge the capacitors causing the breaker to trip.
If you connect the battery first that won’t happen and a smaller B breaker can be used.
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