AC logic please for bypass of inverter - SailNet Community

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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance > Electrical Systems
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  #1  
Old 06-25-2012
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AC logic please for bypass of inverter

Hi
We just wired our 30 amp shore power into the boat to a 30 amp double pole breaker.



We then wired it to our charger inverter.
All works well.

Now we want to eliminate one 110 volt outlet and the water heater form the charger inverter. We do not want the inverter to supply AC to the Water Heater or the 110 AC outlet.

So I guess it is can we just use one bus for the power (Black) wire insteda of two buses one for the Whte and one for the Balk wires?

We have little room left for more buses.

The wiring.

10\3 - Black, White and Green

The AC comes into the boat Black, White and Green.

Black, White and Green wires connect to the top of the 30 amp breaker.

Then a new set of Black White and Green wires connect to the 30 amp breaker.

The green wire connecting to the Green on top of the breaker for the reverse polarity check.

Then at the bottom of the 30 amp breaker the Black and White wires connect and run to the charger\inverter.

From the charger\inverter the Black, White and Green wires run to different buses.
At the buses all the other AC wires are connected.

The port and starboard AC outlets ect.
It all works fine.

Now we want to eliminate the Water Heater and one outlet from the charger\inverter.

We have limited space for more buses, re-staed .

We are thinking that one bus would work? We could attach a Black power wire from the bottom of the 30 amp breaker where it also goes to the charger\inverter only this one goes to a different bus and not the charger inverter.

At this bus we wire the a Black power wire from the Water Heater and the Black power wire from the 110 outlet and not to the bus where the other black power wires go.

Questions:

Now they are separate from the Charger\inverter and will not be live if the inverter is on?

Will this work and will the inverter think they are attached and be working to supply power to these two items at the separate bus?

The inverter will still see the Green ground and the White natural wire for these two devices.


Last edited by SanDiegoChip; 06-25-2012 at 01:41 PM.
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Old 06-25-2012
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Re: AC logic please for bypass of inverter

Chip

Probably the best way to wire an inverter is for its output to go to a separate panel that only has the breakers on it for those items that you want the inverter to run.

Where are your circuit breakers for the AC circuits - I only see the 30 amp main which will not protect outlets downstream?
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Old 06-25-2012
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Re: AC logic please for bypass of inverter

Good question.
Well there were three breakers before.

Two for shore power.

One I think for the port side AC outlets and for the starboard side AC outlets (Main Cabin)

Now that you mention it

Guess we need to add one 30 amp breaker back for the Main Cabin.


Thanks,
Chip
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Old 06-25-2012
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Re: AC logic please for bypass of inverter

Chip

Standard outlets should be 15 amp breakers if wired with 14 awg. 20 amp outlets are available and would need to be wired with 12 awg.

The 30 amp main breaker - double pole - is only on the incoming shorepower.
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Old 06-25-2012
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Re: AC logic please for bypass of inverter

Right, I was typing not thinking again.
OK then I can wire a 15 breaker to the outlets as we are using 10\3 awg wire.

Now how about my question for the seperate bus for non inverter items?
Run a balck wire from the 30 amp breaker to a 15 amp breaker to a bus.
Run the non inverter items black wire to the bus?
We do not have space for a seperate panel for the inverter. at present everything would run off the inverter unless it is shut off.
Thanks,
Chip
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Old 06-25-2012
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Re: AC logic please for bypass of inverter

15 amp breaker works with 14/3 wiring.

Yes you can go from the 30 amp main to separate buses and from there to outlets but they have to be breaker protected by 15 amp breakers.

Remember to keep the hot and neutral on the incoming side of the inverter separate from the hot and neutral outputs.

I think I would find room for a sub panel.
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Old 06-27-2012
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Re: AC logic please for bypass of inverter

Hi,
We added a bus for the AC outlets. They are wired to this bus then the bus is wired to a 15 amp breaker. This protects the outlets\wires.
Of course all the wiring needs to be staked down but until we are finished it is just a hanging there


The bus is not epoxyed in yet.
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Old 06-27-2012
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Re: AC logic please for bypass of inverter

I forgot to add that we have found room for two more buses. These will be for the non-inverter items such as the AC hot water heater breaker. One will be for the power (Black) and one will be for the neutral (White) wires. This should finish this off.
Thanks,
Chip
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Old 06-27-2012
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Re: AC logic please for bypass of inverter

Sounds good as long as each circuit has a breaker of the right size - probably 15 amps.

I just installed an inverter and the output runs to the panel shown below. It has everything you need and is a neat solution.
AC 3 Position - PN 8058 - Blue Sea Systems
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AC logic please for bypass of inverter-8058.jpg  
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Old 07-09-2012
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Re: AC logic please for bypass of inverter

Quote:
Originally Posted by mitiempo View Post
I just installed an inverter and the output runs to the panel shown below. It has everything you need and is a neat solution.
AC 3 Position - PN 8058 - Blue Sea Systems
This looks and seems a good solution. We however have no room for it. I wish they could make an afordiable panel in a self containe box. That way we cvould install it in a out-of-the way location.

Our nav staion is full.

Any way this is what we came up with. It uses some original breakers and we just added two samll buses.

What we did was we installed two buses. They are the small round type and Blue Seas (PowerPost) bus.



We connected one to the power (black) post on the 30 amp breaker just after it comes into the boat as it comes out the bottom of the breaker and the same for the common (white) wire.



The for example we wired the power to a 20 amp breaker and then the breaker to the hot water heater. The common from the Hot water heater to the common round bus. The green to the green bus which is used for all AC ground.

Seems to work out great.
Chip
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