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DIY Transfer switch

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pda1

New Member
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Feb 16, 2021
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It like to make or maybe purchase a transfer switch so I can, obviously, manually quickly switch between solar (inverter) and grid and not have to shut down the appliance or device that's being used. I figure if I flip the switch fast enough there wont be any loss of power to the device.

For the moment I don't want to purchase the MOES switch but you can try and talk me out of it. Too many gadgets.

Thanks

Peter
 
pda1 said:
It like to make or maybe purchase a transfer switch so I can, obviously, manually quickly switch between solar (inverter) and grid and not have to shut down the appliance or device that's being used. I figure if I flip the switch fast enough there wont be any loss of power to the device.
Click to expand...

I don't care how much meth or crack you consume, you won't be able to do it fast enough.
 
How many amps? What voltage? Single or split phase?

I think you want and automatic contactor relay and possibly modify to have manual control.
 
time2roll said:
How many amps? What voltage? Single or split phase?

I think you want and automatic contactor relay and possibly modify to have manual control.
Click to expand...
Amps- no more than 10
Voltage- 120vac
Phase- single

Thought of using a 3-way wall switch (as used in a house)
 
time2roll said:
How many amps? What voltage? Single or split phase?

I think you want and automatic contactor relay and possibly modify to have manual control.
Click to expand...
Ok....please point me in the direction of one of those devices.
 
pda1 said:
Ok....please point me in the direction of one of those devices.
Click to expand...
https://www.progressivedyn.com/specialty/5300-series-automatic-transfer-switch/

PD53-100-Lc_outlined_med-res-768x804.jpg
 
sunshine_eggo said:
I don't care how much meth or crack you consume, you won't be able to do it fast enough.
Click to expand...

This one is fast enough, because turning one breaker on trips the other off:

www.homedepot.com

Square D QO 30-Amp 4-Space 8-Circuit Generator Main Breaker Outdoor Manual Transfer Switch QO1DM10030TRBR - The Home Depot

The Square D by Schneider Electric QO 30/100 Amp 4-Space 8-Circuit Temporary Transfer Generator Panel helps you change from utility power to a standby source with the flip of 2 QO main circuit breakers.
www.homedepot.com
 
pda1 said:
Thought of using a 3-way wall switch (as used in a house)
Click to expand...

Not sufficient isolation to be safe for either your inverter or the lineman.

A UL listed transfer switch or interlocked breaker has some testing behind it.
 
I have several Progressive 240/120v @ 50a ATSs - that do the daily switch to off-grid solar inverter and back to grid when the battery runs down.
These are mechanical relays and not fast enough for electronics... so I use several UPSs for computers, K-Cup (to keep its clock setting), TVs/Tivo etc
 
Last edited:
sunshine_eggo said:
I don't care how much meth or crack you consume, you won't be able to do it fast enough.
Click to expand...
That's not true. I do it everyday using a Reliance Pro Tran manual transfer switch. Have never had an issue with my fridge, router, TV, computers etc. The only item that restart on a few occasions is a TV set top box.

Reliance Transfe Switch
 
Last edited:
Have no experience with it so cannot speak to it. What I would say though, is that the Xantrex would switch all circuits at once as opposed to the Pro Tran, where you can switch each circuit individually. This is to me the better option as it allows you to better manage your loads so as not to over your inverter.
 
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