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Question about ground wiring

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elias:
Hi to all,
I am wondering ,how you setup the ground wiring when having an inverter on board ?

Does the DC negative coming in the inverter is also the GROUND of the AC produced?
There is a copper cable going to the keel bolts I can’t remember exactly from where ,I think from the negative .

In a new setup I made I have a dedicated lifepo4 battery to the inverter, charged only from dedicated pv panel and charger.

Domi409:
Hello,
For my setup, the following are connected together:
- Service battery DC negative (so also inverter DC negative)
- Engine battery DC negative
- AC quay groung and all AC plugs ground
- AC neutral of the inverter
- Case of the inverter

It allows to make use of existing AC setup of the boat and differential protection.
Precaution to make: never plug shore and inverter at the same time.

elias:

--- Quote from: Domi409 on January 19 2023, 23:10 ---Hello,
For my setup, the following are connected together:
- Service battery DC negative (so also inverter DC negative)
- Engine battery DC negative
- AC quay groung and all AC plugs ground
- AC neutral of the inverter
- Case of the inverter

It allows to make use of existing AC setup of the boat and differential protection.
Precaution to make: never plug shore and inverter at the same time.

--- End quote ---
Same here except the casing , is Chinese one and there wasn’t any marked ground as the previous victron
The only thing about shore and inverter simultaneously is that a had an electrician that installed a 3 position lever for AC , SHORE - INVERTER - OFF , another relay I think that when senses inverter on disarms the shore power , and the AC battery charger is connected only to the shore power main .

Domi409:
Hi, yes, I also have a 3 positions switch, Shore-Off-Inverter. In the inverter position it simultaneously switches off the battery charger AC input.
It allows to use the AC panel of the boat as if it was shore power. Only precaution is to switch off the water heater to prevent draining the service battery.

elias:
You are right , it can be a major power loss ..I had the element changed to a 300watt for that reason…
Anyway , in your inverter the ground is just a screw in the case and then a cable to negative DC?

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