woko forum posts in last 60 days

shaggybaxter said..
Hi Lazz,
Yes, connect the inverter chassis ground to neg busbar, which then connects to the boat's ground. This is the light green wire in Q's wiring diagram. Only use one ground connection from the neg busbar to the boat hull/engine, multiple grounds can be problematic.

The right hand information box has a statement " when operating in inverter mode, the neutral output must be connected to ground'.
I would reword this to say" The AC system must have a Neutral-Earth bond when the inverter is the supply source".

This is done internally in the Multiplus II. This is a safety thing and uses an internal Neutral-Earth relay. When you are connected to shore power it disconnects, so the shore power handles all the safety stuff (RCD). When you are off shore power and the inverter is the AC source, the internal relay kicks in to bond the Neutral-Earth, enabling RCD protection to work on the boat.

The boat earth is very high impedance compared to the neutral conductor, so AC current doesn't 'flow' through to the hull, just like current doesn't flow through the earth stake on your house. This simply ensures the hull and Neutral sit at the same voltage unless a fault occurs. In normal operation, think of the boat ground as a reference, not a current carrying circuit.

Ergo:
-- Do wire the Multiplus-II chassis ground to the boat's ground. That's it.
-- Do not wire any AC (L, N or PE) to your boat's ground.

Cheers!
SB

Lazzz said..
Just about to install a new Victron Inverter & wondering where I should connect the Chassis to ground connection on my steel boat??