November 27, 20196 yr Would the attached schematic be the correct way to wire up a Voltronic VMIII off-grid with a gennie on the AC input?
November 28, 20196 yr 11 hours ago, DrLoLCat said: Voltronic VMIII Do not connect the Input and Output neutrals together. They should be separate. And also remove the Neutral-Earth bond on the output side.
November 28, 20196 yr 35 minutes ago, DrLoLCat said: Why should there not be an N-E bond? The inverter will register an Earth Fault. If there is an Earth and Neutral bond on the incoming supply and you create one on the Output as well, effectively you will connect your input Neutral directly to your Output neutral. A few Brands have a Neatral-Earthing Relay that will bond the two in the event of a power failure, but also not allowing it to bond while the Grid is available. If any bonding happen, its should only be during a power failure, either by way of an internal relay, or an external device.
November 28, 20196 yr Author Thanks Jaco. This is for an off-grid installation. There is no utility connected. Only a gennie on the input which will be used if battery is empty. So there is no N-E bond on the input. Are you saying that even for this off-grid application N-E should not be bonded on the inverter output?
November 28, 20196 yr Author On 2019/03/04 at 2:37 AM, Javi Martínez said: Hi Nuno. VMII and VMIII never ground neutral. Which is your model? Is It an OnGrid system? According to this post, the VMIII will never ground the neutral by itself. So is having the neutral voltage floating acceptable then?
November 28, 20196 yr 2 hours ago, DrLoLCat said: Are you saying that even for this off-grid application N-E should not be bonded on the inverter output? Personally i will not bond it. What happens when you start the gen, the gen will also be earthed so again you will have the Input and Output neutrals connected to each other. Maybe some other member know of a way to make this work, but I have never bonded any earth and neutral on the output of any inverter.
December 7, 20196 yr Author Update: Didn't bond it. But the inverter bonds neutral and earth. All is good.
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