DIY Auto transfer switch questions?

[Mike90250]

Maybe you need a large computer style UPS ?

[PNW_Steve]

Oops. Posted on the wrong thread.

But, please feel free to comment on my question.

[PNW_Steve]

By the time you work out the fail-safes, you may as well buy a certified ATS (Automatic Transfer Switch)

Is this for 120V or 240V ?
one that looks to not be junk https://www.solar-electric.com/pomax...AaAuk6EALw_wcB

Looks good for it's intended application but, as far as I can tell, it will not play in my application as the time delay is fixed.

[PNW_Steve]

. If you do a DIY and something burns up, insurance will not cover you.

This whole project is DIY. I am converting a school bus to an RV.

[Mike90250]

It's hard to beat the one i linked to, if it covers your amps.
Fail-safe. simple relays, switching household loads, can sometimes weld contacts and that will mess up your day. If you do a DIY and something burns up, insurance will not cover you.

if you install a UL rated switch, it's not likely to burn up, and if it did, your insurance should cover the losses

[PNW_Steve]

120V.

For a simple 120V transfer switch with no need for time delay what fail-safes are you referring to?

[Mike90250]

By the time you work out the fail-safes, you may as well buy a certified ATS (Automatic Transfer Switch)

Is this for 120V or 240V ?
one that looks to not be junk https://www.solar-electric.com/pomax...AaAuk6EALw_wcB

[PNW_Steve]

Hey Everyone,

I am working out the electrical systems for my RV conversion and have run into questions regarding my inverters and ATS.

Trying to be a bit creative and frugal I thought that I would look into building my own.

Just to be clear, I want certain receptacles to be fed shore power and when shore power disappears I want them to switch over to inverter power.

As I pondered the problem and potential solutions I came upon the idea of simply using a DPDT relay with the coil connected to the shore power connection.

No shore power=Coil de-energized=Inverter connected to load
Shore power on=Coil energized=Shore power connected to load

This can't work. It's too simple...... What am I missing? I don't need a time delay like my generator transfer switch.

Any thoughts?