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hill
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Re: Do It Yourself: 240v from two 120v sources

Thu Mar 20, 2014 9:30 am

eHelmholtz wrote:
hill wrote:pretty clean ... good job!
(segway) iirc, someone on the thread asked me about hooking up our 240v from 120v sourc boxes on receptacles with gfi's. I'd mentioned spoofing their gfi's with a 120v isolation transformer. I think my wife's uncle wired it up something like this (forgive the primitive drawing skills please) :
Cool! that's very helpful. Do you have a photo of the actual transformer and setup you have?
it's been collecting dust the past 1½ years ... since QC's finally started showing up
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fooljoe
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Re: Do It Yourself: 240v from two 120v sources

Thu Mar 20, 2014 11:16 am

So what brand/model transformer did you start with? Or did you wind it yourself (from what source)?
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eHelmholtz
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Re: Do It Yourself: 240v from two 120v sources

Mon Apr 07, 2014 9:44 pm

Wow! A friend just pointed this out to me. Valery over at EMW is selling Y connectors, taking 2 120V outlets to make a 240V. This is not for the faint hearted and reminds me of his initial attempts at a less than $100 EVSE. This is from his website:

"Dual 'regular' 3-prong household plug - to convert 2 120V outlets in your house into a mighty 240v supply. You will have to provide your own extension cords to reach those two sockets (which will have to be on different 'branches' in your house wiring). You can get those extension cords pretty much anywhere (Home Depot in the US, etc). Just make sure you use heavy duty 12 or 10 gauge cords. With your purchase of this adapter, we will be supplying directions on how to identify which sockets sit on different branches. It is really easy. You can also test your circuit yourself before ordering to make sure it will work with this adapter. Note the breakers for your respective outlets that you would like to use, then in your electrical panel, measure the voltage between the wires that enter the respective breakers. You will see either 240V or 0V. If you see 240V, you can use those outlets to get 240V. Note that the outlets have to be regular 120V outlets, not the GFCI type (GFCI outlets normally have a test button and a small indication light)."

This is example from the field:
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Last edited by eHelmholtz on Tue Nov 18, 2014 7:57 am, edited 2 times in total.

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DaveEV
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Re: Do It Yourself: 240v from two 120v sources

Mon Apr 07, 2014 9:53 pm

eHelmholtz wrote:Wow!
I think that sums it up nicely! :shock: :shock: :shock:

For only a few bucks more it can be built properly, but I guess that might be too safe?

chris1howell
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Re: Do It Yourself: 240v from two 120v sources

Mon Apr 07, 2014 10:38 pm

drees wrote:
eHelmholtz wrote:Wow!
I think that sums it up nicely! :shock: :shock: :shock:

For only a few bucks more it can be built properly, but I guess that might be too safe?
WOW indead... That's an electrocution waiting to happen...
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TonyWilliams
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Re: Do It Yourself: 240v from two 120v sources

Tue Apr 08, 2014 9:27 am

I'm sure folks know that the "Quick220" is patented.

I guess we need to know when that runs out, and I'll offer a "safe" version.

johnrhansen
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Re: Do It Yourself: 240v from two 120v sources

Tue Apr 08, 2014 9:58 am

I wonder... has anyone ever tried building a combiner box without the safety relays, and actually testing what current is available on the disconnected plug? It might be possible that the evse turns off the moment it sees an anomaly in the power and will not pass the current through to the disconnected plug. Just a disclaimer.. I'm not saying the relays are not necessary, but I am curious exactly how much a danger there is without them.
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mwalsh
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Re: Do It Yourself: 240v from two 120v sources

Tue Apr 08, 2014 11:28 am

johnrhansen wrote:I wonder... has anyone ever tried building a combiner box without the safety relays, and actually testing what current is available on the disconnected plug? It might be possible that the evse turns off the moment it sees an anomaly in the power and will not pass the current through to the disconnected plug. Just a disclaimer.. I'm not saying the relays are not necessary, but I am curious exactly how much a danger there is without them.

It doesn't matter if the EVSE turns off. 120V will still be flowing through the Quick220-type device from the one plug that's still plugged into the wall. The moment you touch the prongs on the end you've unplugged, you'll get zapped.
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Re: Do It Yourself: 240v from two 120v sources

Tue Apr 08, 2014 11:55 am

mwalsh wrote:
johnrhansen wrote:I wonder... has anyone ever tried building a combiner box without the safety relays, and actually testing what current is available on the disconnected plug? It might be possible that the evse turns off the moment it sees an anomaly in the power and will not pass the current through to the disconnected plug. Just a disclaimer.. I'm not saying the relays are not necessary, but I am curious exactly how much a danger there is without them.

It doesn't matter if the EVSE turns off. 120V will still be flowing through the Quick220-type device from the one plug that's still plugged into the wall. The moment you touch the prongs on the end you've unplugged, you'll get zapped.
Essentially the current available to shock you will be whatever "small" amount the EVSE is using to power itself right? The issue is it only takes x milliamps to kill you. You'll basically become part of the neutral side of a 120 volt circuit powering the EVSE it self.

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Re: Do It Yourself: 240v from two 120v sources

Tue Apr 08, 2014 12:10 pm

The name may be a trademark but if it is not defended it becomes public domain, i.e. Kleenex, Xerox, Vaseline, etc. Anyway, hopefully it would be a Quick240!

In any case, it should be made clear that the device pictured is dangerously unsafe. Yes, it will work but one must be very careful, never make a mistake, continuously supervise it and be sure to will it to someone who is equally qualified after you are gone.
TonyWilliams wrote:I'm sure folks know that the "Quick220" is patented.

I guess we need to know when that runs out, and I'll offer a "safe" version.
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