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Hi there,
I just observed something strange: The Grid is Not connected But when I Turn on the Switch for the Ac Input there is 70volts ac on the AC IN.
An IF i do connect the Grid, the whole unit goes into alarm mode.
Does anybody have an idea or has Seen this behavior before ?
Hi @Faraday
Did you properly ground your inverter casing? and where are you measuring the voltage exactly?
Hi @Daniël Boekel (Victron Energy Staff),
I measure the voltage Right at the ACin 16A connector between L and N. Well, on the extension cable actually.
the casing is well grounded by using the proper bolt.
I did have the grid connected to the Unit but the circuit braker fuse Flicked - so I unplugged it and tried to find whats wrong. The Internal breaker did Not flick. Since then the Unit goes into Alarm (only Alarm LED on) - that state is not described in the Manuel unfortunately.
It is actually 72,5 V AC: 
and here is Video of what happens when grid comes in: Link to Video
Hi @Faraday
Can you please measure this at the terminals of the inverter?
Also please measure with the breaker open and input connected.
So, here are the measurements I Took today right on the Pins of the Terminal.
ACin breaker closed:
Between L + N: 68,1 VAC 50,00 hz
Between L + ground (chassis): 230,00 Vac 50,00 hz
Circuit breaker open, Inverter Mode ON:
Between L + N: 0 volts
Between L + ground (chassis): 0,035 Vac 50,00 hz
when the ACin circuit breaker is closed and i Switch the invertiert to Off, the voltage between L+N Drops to zero as it would when i Open the circuit breaker.
Will do the measurement with breaker open and connected input tomorrow. Today it was not possible.
I Hope the Stated measurement are already usefull.
to the 2nd measurement with closed breaker:
Shouldn‘t the safety relay avoid exactly that?! The 230 vac from the inverter Are now let through to the output !?
