S-250 Shelter Power Receptical Question

[ke5eua]

Piggy backing or do you mean "daisy chaining"?

Daisy chain, piggy back all the same

 

[Skinny]

Are you running something 208v 3 phase in the shelter? Why not convert to single phase 120v so you have the ability to plug the shelter in to conventional residential or generator power? I required my M1031 to 120/240 with an L14-30 plug so my truck would be useable. Of course you may need it for some 3 phase military or commercial gear.

 

[dependable]

I required my M1031 to 120/240 with an L14-30 plug so my truck would be useable.

I was thinking of doing this. Did you the change out the 3 phase air compressor motor?

 

[Skinny]

Not yet, has not been a priority. One day I'll swallow the $200 and solve that problem.

 

[dtdoyle01]

I actually striped out all the 208 3 phase wiring and rewired for 110. I picked up the 3 pin connector and made a cable to power the shelter. Now that it is getting hot here in Arizona, 101, 3 days ago. I am going to gut the 208 AC unit on the front of the shelter and install a 110 AC in the existing case, so as not to change the look of the truck. I power the shelter in the field with a Beem 3000 watt propane generator.

 

[rmgill]

Why not go with 240? Some of the 208 three phase gear may work with 240 VAC ( 2 phases).

 

[tim292stro]

240 is still single phase, unless it's three phase delta. The two 120 "phases" you find in residential are from a center-tapped 240V transformer (center tap is neutral, and grounded). For a 3-phase AC that doesn't use the neutral, a 240V single phase supply wouldn't work - two of the three phases would be "dead".

It's better in my opinion to take a procedural approach to this decision tree:

• Does the AC require 3-phase power?
  • Yes. Are you able to provide 3-phase power?
    • Yes. Provide 3-phase power. Done.
    • No. Find a different AC to use that runs on the power you can provide. Done.
  • No. Does the AC support the voltage range from your single phase source?
    • Yes. Will you generator support the surge start requirement of the compressor and the other concurrent loads at the voltage you can provide?
      • Yes. Will the BTU output be sufficient with the different single phase voltage can provide?
        • Yes. Provide single phase power. Done.
        • No. Find a different AC to use that runs on the power you can provide. Done.
      • No. Find a different AC to use that runs on the power you can provide. Done.
    • No. Find a different AC to use that runs on the power you can provide. Done.

If you can't figure out the answers to these questions, and are not familiar with AC specification in general - it might behoove you to re-frame the question in more simple terms.

 

[rmgill]

208 made from two of the three phases (120 vac phase to ground) of a three phase system will power most items that will run off of 240 volt from single phase systems. That was the angle I was driving at. Now if the device really needs all three phases, then yeah, residential power won't work.

I guess I wasn't entirely clear.