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I've just put together a 50A deluxe kit with a NEMA 14-50 AC plug and I'm using it happily for the last two days.  I was hoping to take this with me occasionally and use it with a 14-50 to 5-15 adapter. That 5-15 would be 120V, of course. Would this work? I don't know if the 40A contactor in this kit will operate on 120V. 

  

I just realized that I didn't say how I hooked up the 14-50 cable. I used only hot1, hot2, and ground, leaving the cable's neutral wire unused.

That's what I was worried about. I'm not familiar with anything but automotive relays, are there

120V->240V contactors I could use?

If I did find one and replace the one in my kit, would everything "just work"?

Christoper, I did a check on the Contractor, and think I found the same one on Amazon.  It list the input as 24V.  Would it be possible to use a relay to activate the contactor, using the 12V from the open EVSE, then activate a relay connecting 120V to activate the contactor?  I would like to have a 120 12A 15A 20A and 240 12A 15A 20A 40A and 50A incase I get a Leaf later, which will need the 40A 240 to charge at max rate.

Hi Chris, I have ordered the 30a kit. It sound like for me to be able upgrade this for higher amp cars I will need to locate the proper amperage contactor that can activate with 12v? I think I found some but they are very expensive. I'll need to locate a better cost option.

Sorry to drag up an old thread... but along the same lines -

How tight is the spec on the 160mA coil draw? I found these: http://www.alliedelec.com/images/products/datasheets/bm/1_Datasheets/70799070.pdf

http://www.alliedelec.com/images/products/datasheets/bm/MAGNECRAFT/70185047.pdf

Both with 12VDC coil resistance of 70 Ohm

At 12VDC it looks to pull about 171.5mA. Going this route I believe we could get a single box that would handle 120VAC and 240VAC up to 40/50A depending on the fuses we use... all assuming ~171mA isn't going to kill the driver.
Thoughts? Just learning about EVSE and looking forward to having the most flexible option available.

Thanks! I think that's just what I need. I'm not sure there is enough power left to power the this relay. However I think we can use the original relays to trigger this! I have been busy and not looking for the right part. But I think this might work. I'll check it out more and give it a try!

Fantastic! I'm also planning on the 450. Since you already beat me to the punch I'll wait for your results. I'm looking to order another 2 kits soon and I would love a single 120/240 solution that works up to 40a continuous!

@Christopher: Please let us know in this thread. If it works with the wifi module, I'll swap the Packard contactor out for one of these.

Anyone make any progress trying this out? I ended up buying a 30A Deluxe. Thinking about upgrading it with a 50A contactor, and trying to build a second smaller box like the old 30A basic for portable charging with the fuses and relays.