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Old 04-19-2019, 01:56 PM   #1
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Transfer Switch

I ordered the Onan 5.5KW generator with my Beacon and it comes with an "automatic" transfer switch (I believe). I'm reading through manuals today. I'm not sure I really understand the purpose and function of this device. I believe both the shore power and the generator are connected (as possible sources) and the output side supplies the coach. Does that sound about right? My question is, when I'm plugged into shore power, will something bad happen if I fire up the genny. what will this transfer switch do...ignore one? Any one shed any light on this for me?
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Old 04-19-2019, 02:16 PM   #2
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You are correct that both shore and generator connect to the input of the auto transfer switch and its output goes to the main breaker panel.

With generator off, shore power goes in and thru the auto transfer switch to the main breaker, powering the RV.

When you start the generator, the auto transfer switch senses the power from the generator and does 2 things at once.

After a 30 second delay, for the generator to warm up a bit, it disconnects the shore power input and then it connects the generator power to the main breaker panel. That's the automatic part.

No conflict or mixed powers.

It will stay that way until you shut off the generator and only then will it switch back.

Automatic transfer switchs are very safe and fool proof as long as its wired correctly.
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Old 04-19-2019, 02:28 PM   #3
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Quote:
Originally Posted by twinboat View Post
You are correct that both shore and generator connect to the input of the auto transfer switch and its output goes to the main breaker panel.

With generator off, shore power goes in and thru the auto transfer switch to the main breaker, powering the RV.

When you start the generator, the auto transfer switch senses the power from the generator and does 2 things at once.






After a 30 second delay, for the generator to warm up a bit, it disconnects the shore power input and then it connects the generator power to the main breaker panel. That's the automatic part.

No conflict or mixed powers.

It will stay that way until you shut off the generator and only then will it switch back.

Automatic transfer switchs are very safe and fool proof as long as its wired correctly.



THAT sums it up^^^^^^
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Old 04-19-2019, 05:22 PM   #4
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Thank you. I can check that one off and file the booklet.
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Old 04-20-2019, 06:37 AM   #5
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Quote:
Originally Posted by twinboat View Post
Automatic transfer switchs are very safe and fool proof as long as its wired correctly.
Twinboat: Thank you for explaining how these thinks work. I was not totally clear on this until now.

Sorry but I can't help myself for this old saw: "Nothing is fool proof for the determined fool".
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Old 04-21-2019, 10:09 AM   #6
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There was a thread here recently (which I can't find right now) that shows what happens if the screws that hold the wires in place on the transfer switch come loose. It was suggested that every year you take the cover off the switch and make sure the screws are tight. Be sure you're not plugged in or have the generator running.

This isn't the one I was looking for, but it talks about the same thing.

A "heads up" about your electric transfer box
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Old 04-23-2019, 01:20 PM   #7
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Quote:
Originally Posted by 12amNSX View Post
There was a thread here recently (which I can't find right now) that shows what happens if the screws that hold the wires in place on the transfer switch come loose. It was suggested that every year you take the cover off the switch and make sure the screws are tight. Be sure you're not plugged in or have the generator running.

This isn't the one I was looking for, but it talks about the same thing.

A "heads up" about your electric transfer box
Yep, my manual gives the torque specs for those wired connections.
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Old 04-25-2019, 10:16 AM   #8
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Quote:
Originally Posted by twinboat View Post
You are correct that both shore and generator connect to the input of the auto transfer switch and its output goes to the main breaker panel.

With generator off, shore power goes in and thru the auto transfer switch to the main breaker, powering the RV.

When you start the generator, the auto transfer switch senses the power from the generator and does 2 things at once.

After a 30 second delay, for the generator to warm up a bit, it disconnects the shore power input and then it connects the generator power to the main breaker panel. That's the automatic part.

No conflict or mixed powers.

It will stay that way until you shut off the generator and only then will it switch back.

Automatic transfer switchs are very safe and fool proof as long as its wired correctly.
Thank you for this explanation. Does this also apply when driving and alternator is charging house batteries? For some reason the previous owner disconnected alternator connection and it's my next priority.
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Old 04-25-2019, 10:20 AM   #9
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Transfer switch (ATS) only deals with 120V AC. Your issue is with your 12V system.
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