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UTS10BI 240 volt power input

Discussion in Universal Transfer Switch started by tom , 9/18/2013 10:11 PM
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UTS10BI 240 volt power input

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  • tom_b


    I recently purchased the UTS10BI to work with a Honda EU6500i generator.

    The generator has a 30 amp output receptacle, and another 120/240 volt receptacle.

    The 30 amp output is 120 volts only.

    My question is, can I power the UTS10BI on circuits 9 and 10 using the main

    breaker panel off of utility power - and - have a UPS connected as default "backup2",

    *without* inputting 240 volts from the generator ? - the idea is to get the maximum

    30 amp capacity off the generator on that single receptacle (because the 120/240

    volt receptacle is limited to 22 amps or so).

    I would think this "should" work, since the UTS10BI powered up when I plugged

    120 volts into the UPS input port. So my reasoning is, "if" I can power the UTS10BI

    via the UPS, then I don't need to feed it 240 volts off the generator, and can use the

    single 30 amp output for more capacity on circuits 1 to 8 on the UTS (vs. the other

    reduced 120/240 one).

    Or am I missing something regarding the operational logic of the box ?

  • SecretSquirrel

    Hi tom_b,

    A 240vac input is required to power the UTS10BI at all times. Without the 240vac feed between circuits 9 and 10 while on Generator, the UTS10BI will never fully activate. In addition, the UPS Inlet is rated for 15amp and is limited in it's capability.

    Given the type of generator you currently have, I would have recommended the UTS6H. The UTS6H is 120vac only and comes stock with an L30 receptacle.

  • tom_b


    Just to confirm, with the UTS10BI, feed it 240 volts (on circuits 9 and 10), and i'll

    have 120 volts available on circuits 1-8 ? (albeit from the Honda it would be limited

    to approximately 22 amps using the 120/240 output receptacle on it).

    So if I understand the schematic correctly, it looks as if opposite phases are

    assigned to odd/even outlets (ie. 1,3,5,7 on L1 and 2,4,6,8 on L2), I know this

    has been asked before, but I'm not seeing *why* I cannot use 9, 10 in the

    same manner (assign 9 to L1, 10 to L2). The neutral would have already been

    connected at the main panel. So it would give me 120 volts at 9 and 10 but on

    opposite phases.

    Yes ? No ? Maybe ?

  • elec-engr
    This discussion is marked as answered

    The UTS10BI and the Honda EU6500 work well together.  This is the setup I have. The UTS10BI is made to work off a 120/240V generator output.

    The generator does not "feed" the UTS on circuits 9 & 10. It feeds the UTS through the generator input on the UTS. When on generator power, the odd circuits (1,3,5,7 & 9) are fed from L1 and the even circuits (2,4,6,8 & 10) are fed from L2. The EU6500 can provide about 22A on each phase, or 44A total. (It can supposedly be pushed even higher - see Guy Holt's excellent articles on this - Google search "Guy Holt EU6500is"). So the 120/240V outlet is the way to go if you have a generator so equipped (like the EU6500).

  • tom_b

    Elec-Engr, thank you !

    You gave me the missing piece that for some reason I wasn't

    fully grasping (that I had 22 amps available on each phase to

    get 44 amps total).

    Awesome !

    Thanks again smile

  • SecretSquirrel


    Thank you for your input in this matter. Although I understand the inner workings of the UTS, I'm not too familiar with the full capabilities of the generator in question.


  • wayne_i

    The reason that you should NOT use outputs 9 and 10 as two separate 120 volt circuits is because the UTS10BI is designed for circuits 9 and 10 to be connected to a 240 volt load, and therefor, the current through both circuits should be virtually identical at all times. Under this condition, there would be no real benefit in measuring the current in both circuits, so the UTS10BI only measures the current in circuit 9 and assumes that the current in circuit 10 is the same for the purpose of power monitoring and overload protection calculations for the 240 volt load. This means if circuits 9 and 10 were to be used separately, their power monitoring and protection calculations would not be accurate, resulting in possible unreliable or unsafe conditions  Furthermore, circuit setup does not have provisions for setting the options for circuits 9 and 10 separately. In short, the UTS10BI will ALWAYS respond to circuits 9 and 10 as a pair, or in other words as a single load.

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