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[GMCnet] Low power transfer switch [message #363484] Sat, 17 April 2021 13:37 Go to next message
Keith V is currently offline  Keith V   United States
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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Senior Member
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
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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Re: [GMCnet] Low power transfer switch [message #363488 is a reply to message #363484] Sat, 17 April 2021 15:03 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   Canada
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
Senior Member
Keith V wrote on Sat, 17 April 2021 14:37
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

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[GMCnet] Re: Low power transfer switch [message #363492 is a reply to message #363484] Sat, 17 April 2021 15:38 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
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.


On Sat, Apr 17, 2021 at 2:37 PM Keith V wrote:

> 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:
>
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GMCnet mailing list
Unsubscribe or Change List Options:

Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach

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[GMCnet] Re: Low power transfer switch [message #363493 is a reply to message #363492] Sat, 17 April 2021 18:26 Go to previous messageGo to next message
Keith V is currently offline  Keith V   United States
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
Senior Member
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.


On Sat, Apr 17, 2021 at 2:37 PM Keith V wrote:

> 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:

Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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[GMCnet] Re: Low power transfer switch [message #363494 is a reply to message #363493] Sat, 17 April 2021 19:01 Go to previous message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
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.


On Sat, Apr 17, 2021 at 7:27 PM Keith V wrote:

> 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.
>
>
> On Sat, Apr 17, 2021 at 2:37 PM Keith V wrote:
>
>> 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:
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:

Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach

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