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Generator size

Discussion in 'Home Power and Microgeneration' started by Philip Edell, Jul 6, 2003.

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  1. Philip Edell

    Philip Edell Guest

    Hi everyone,

    I would like some assistance choosing the right size of generator.

    I have 2 x Trace SW3048E (230v) in parallel.

    The manual says each inverter can use 15 A AC for charging, and 30A pass
    through, giving total of 30 A charging and 60 A pass through.

    So having a generator larger than 20.7 kVA (230v *45A + 45A) would seem

    Also mentioned is max DC charge rate of 50 A (@ 48v )

    I draw 180 A from my 1200 Ah battery daily and want to recharge the
    batteries using the new generator in a couple of hours if possible.

    Any advice or experience anyone has about sizing this gen set this would be a
    great help.


  2. Philip Edell

    Philip Edell Guest

    Thanks Ron

    That's exactly the sanity check I was after.

    I also seem to remember hearing that its better practice for fuel efficieny
    to run a small gen at full power, rather than a larger one at low load.

  3. Dale Farmer

    Dale Farmer Guest

    this is, as a general rule true. Assuming that the equipment is designed
    to run at full capacity all the time. Some of the cheaper generators will
    destroy themselves if run at full load all the time, since the designers
    cheaped out on some components. Oil filters and coolers come to
    mind, but generally manifests as overheating and accelerated aging of
    the components.
    You see this a lot in larger modern heating and cooling plants, lots
    of smaller units that combine their outputs, and the individual units are
    either at full load or off.

  4. 60*60=3600
    60*50=3000, so in 50Hz world, 3000 and 1500RPM.
  5. Mark or Sue

    Mark or Sue Guest

    I'm not sure if you're interpreting the ratings correctly (but I'm not at
    all familiar with the trace units, so take this with a grain of salt). Are
    the current paths for charging and pass through separate? I doubt they are.
    How are you going to prevent drawing more than 30A pass through should the
    batteries be fully charged? It is possible that the front end is rated at
    45A and then splits to a 15A and 30A path. If so, you just need a 30A
    breaker on the output to protect the pass through portion

    I would expect these inverters to only be able to tolerate a 30A source
    feeder max, so anything over 14 KVA is not usable.
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