Low power transfer switch

[Keith V]

So i have a 400 watt inverter that i use to run my EBL WUD and supply USB power in the cab. The inverter powers a duplex socket that also has usb power.
Id like a low power automatic transfer switch to switch from the inverter to shire power when available.
I only need 400 watts max.
Has anyone seen or built such a beast?
Dont see anything on fleabay or Amazom...
It seems like a 110v DPDT relay is all thats really needed

 

[Matt Colie]

> So i have a 400 watt inverter that i use to run my EBL WUD and supply USB power in the cab. The inverter powers a duplex socket that also has usb
> power.
> Id like a low power automatic transfer switch to switch from the inverter to shire power when available.
> I only need 400 watts max.
> Has anyone seen or built such a beast?
> Dont see anything on fleabay or Amazom...
> It seems like a 110v DPDT relay is all thats really needed

Keith,

You don't even need that if that inverter is off the house bank. Just leave it on. If you are using power from the inverter, the converter will just
work a tiny bit harder.

Besides, if you have a transfer contactor, when it cycles it will "blink" the 120V available and how much of a problem will that cause??

If it isn't on the house bank, buy a tiny converter charger to put on the main engine start battery - One less thing to worry about.

Matt
--
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

 

[Ken H.]

Keith,

Here's exactly what you asked for. I used a 30 A relay to carry the entire
coach load, for your purpose, you could use a smaller/cheaper one.

http://www.gmcmhphotos.com/photos/g3484-automatic-120-vac-power-source-selection.html

Ken H.

> So i have a 400 watt inverter that i use to run my EBL WUD and supply USB
> power in the cab. The inverter powers a duplex socket that also has usb
> power.
> Id like a low power automatic transfer switch to switch from the inverter
> to shire power when available.
> I only need 400 watts max.
> Has anyone seen or built such a beast?
> Dont see anything on fleabay or Amazom...
> It seems like a 110v DPDT relay is all thats really needed
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

 

[Keith V]

Thanks Ken, thats what i was thinking. It seemed too simple, made me suspicious!

But i think Matt has the best idea. I do have a nice PD converter to charge the house battery. Why make it more complicated than necessary.
Wait.. did I say that? Lol
________________________________
From: Ken Henderson
Sent: Saturday, April 17, 2021 3:38:44 PM
To: GMC Mail List
Subject: [GMCnet] Re: Low power transfer switch

Keith,

Here's exactly what you asked for. I used a 30 A relay to carry the entire
coach load, for your purpose, you could use a smaller/cheaper one.

http://www.gmcmhphotos.com/photos/g3484-automatic-120-vac-power-source-selection.html

Ken H.

> So i have a 400 watt inverter that i use to run my EBL WUD and supply USB
> power in the cab. The inverter powers a duplex socket that also has usb
> power.
> Id like a low power automatic transfer switch to switch from the inverter
> to shire power when available.
> I only need 400 watts max.
> Has anyone seen or built such a beast?
> Dont see anything on fleabay or Amazom...
> It seems like a 110v DPDT relay is all thats really needed
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:

 

[Ken H.]

I agree with Matt and you -- keep it simple. But since I knew the details
of what you asked for, felt I should pass it on.

Ken H.

> Thanks Ken, thats what i was thinking. It seemed too simple, made me
> suspicious!
>
> But i think Matt has the best idea. I do have a nice PD converter to
> charge the house battery. Why make it more complicated than necessary.
> Wait.. did I say that? Lol
> ________________________________
> From: Ken Henderson
> Sent: Saturday, April 17, 2021 3:38:44 PM
> To: GMC Mail List
> Subject: [GMCnet] Re: Low power transfer switch
>
> Keith,
>
> Here's exactly what you asked for. I used a 30 A relay to carry the entire
> coach load, for your purpose, you could use a smaller/cheaper one.
>
>
> http://www.gmcmhphotos.com/photos/g3484-automatic-120-vac-power-source-selection.html
>
> Ken H.
>
>

>
> > So i have a 400 watt inverter that i use to run my EBL WUD and supply USB
> > power in the cab. The inverter powers a duplex socket that also has usb
> > power.
> > Id like a low power automatic transfer switch to switch from the inverter
> > to shire power when available.
> > I only need 400 watts max.
> > Has anyone seen or built such a beast?
> > Dont see anything on fleabay or Amazom...
> > It seems like a 110v DPDT relay is all thats really needed
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>