Wiring in 2000w inverter

[davethedog]

When installing a 12v dc to 240v AC inverter does the earth connection from the inverter go to the negative bus bar(as well as the negative to the inverter)?

Dtd

 

[PaulRainbow]

When installing a 12v dc to 240v AC inverter does the earth connection from the inverter go to the negative bus bar(as well as the negative to the inverter)?

Dtd

Depends on the inverter and in some circumstances how the boat is wired. Should be covered in the inverter instructions.

 

[davethedog]

It just states in the manual to connect the inverter (external connection) to earth.

 

[VicS]

It just states in the manual to connect the inverter (external connection) to earth.

What make and model?



The negative supply to the inverter obviously comes from the negative bus bar

The earth terminal should be connected to the boat's internal earth system............. to which the shorepower earth ( via a galvanic isolator,) the internal 230volt AC system earth, and the anodes should all be connected.
Unless the boat's DC system is a fully isolated the DC negative will also be bonded to this earth.

 

[Graham376]

Rightly or wrongly, my 240v system including the inverter is totally isolated from boat, we're very rarely on shore power so no galvanic isolator. One tip, if you're going to connect the 240v from the inverter to the boats 240v system, wire it in via a double pole changeover switch between the shore power socket and the rcd to stop shore power and inverter being connected at the same time and stop the shore power socket from being live when the inverter is running.

 

[davethedog]

Thanks all and planning to have 2 or 3 dedicated sockets for the inverter output. To avoid extra complications and limit what can use the inverter and batteries.

 

[PaulRainbow]

Thanks all and planning to have 2 or 3 dedicated sockets for the inverter output. To avoid extra complications and limit what can use the inverter and batteries.

You really do need to reveal the make and model of inverter. Inverter 240v will kill you just as surely as shore power and different inverters will need to be connected differently. There can also be issues with how the outlets are connected as well as how things are connected to the boats -12v and shore power Earth.

If your "dedicated" sockets will only be powered by the inverter you won't need the changeover switch mentioned above. You may or may not need a galvanic isolator. Depending on the inverter you may need to connect it to a consumer unit with it's own RCD and circuit breakers.

 

[davethedog]

Here you go

GIANDEL Pure Sine Wave Power Inverter 2000W DC 12V to AC 230V/240V converter with remote controller & dual AC outlets for RV Truck Car https://www.amazon.co.uk/dp/B07G2VL2WP/ref=cm_sw_r_cp_apa_i_4cPHCb9P4JH84

 

[PaulRainbow]

Here you go

GIANDEL Pure Sine Wave Power Inverter 2000W DC 12V to AC 230V/240V converter with remote controller & dual AC outlets for RV Truck Car https://www.amazon.co.uk/dp/B07G2VL2WP/ref=cm_sw_r_cp_apa_i_4cPHCb9P4JH84

If you are just going to use that "stand alone", as in only use the two sockets on the actual inverter, then you don't need to connect the chassis to "Earth", if it's part of a permanent installation it gets more complicated and needs to be wired differently, including Earths and RCDs etc.

So, if you just want a couple of sockets, dedicated to the inverter, use the ones that it has.

 

[davethedog]

Thanks Paul and that is what I will do then to make it easier for myself.

 

[matthewriches]

Ehh?? How so?

If you are just going to use that "stand alone", as in only use the two sockets on the actual inverter, then you don't need to connect the chassis to "Earth",

 

[superheat6k]

I would earth the chassis to the ships bonding system / negative busbar (assuming the bonding system is connected to -VE).

What are you planning to operate from the Inverter ?

2,000 W at 90% efficiency equates to ~ 185amps from a 12vdc supply.

A fully charged 110AH battery would reduce to its normal limit of 50% discharge within ~15 - 20 minutes at such a draw current, and regular discharge at that rate plate damage and certainly a very warm battery would result. Even a limited 1,000W load is going to impact the charge state fairly quickly.

Should have plenty of power for the battery charger though.

 

[PaulRainbow]

Ehh?? How so?

What is it you don't understand today ?

 

[VicS]

I would earth the chassis to the ships bonding system / negative busbar (assuming the bonding system is connected to -VE).

What are you planning to operate from the Inverter ?

2,000 W at 90% efficiency equates to ~ 185amps from a 12vdc supply.

A fully charged 110AH battery would reduce to its normal limit of 50% discharge within ~15 - 20 minutes at such a draw current, and regular discharge at that rate plate damage and certainly a very warm battery would result. Even a limited 1,000W load is going to impact the charge state fairly quickly.

Should have plenty of power for the battery charger though.

 

[matthewriches]

So the OP plugs his toaster in to toast and his microwave to cook..... all is ok?

What is it you don't understand today ?

 

[PaulRainbow]

So the OP plugs his toaster in to toast and his microwave to cook..... all is ok?

Doubt it, it's only 2kw.

 

[matthewriches]

Assume each was a max of 700w for example.

Doubt it, it's only 2kw.

 

[PaulRainbow]

Assume each was a max of 700w for example.

Do you have a point ?

 

[CLB]

Doubt it, it's only 2kw.

2KW will run a typical toaster or a typical microwave, but perhaps not both at the same time

Assume each was a max of 700w for example.

A 700W microwave will draw around 1500w.

 

[matthewriches]

To keep things simple, assume 700w total load on mains circuit.

A 700W microwave will draw around 1500w.