Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Small gas engine electric generator ?

  1. Sep 20, 2008 #1
    i want to know if i can tie 2 generators together to get enough amps to run my house.

    i have an older 10 hp 4.5 k watt genset and a 5.5 hp 3 k watt genset.

    the 4.5 k genset is a 240 plug in but only 15 amps

    my ac is 240 at 30 amps
    and dryer require 220 at 30 amps.

  2. jcsd
  3. Sep 21, 2008 #2


    User Avatar
    Science Advisor
    Gold Member

    Doesn't sound like a good idea to me. Even if you could, you wouldn't have enough current to run your house.
    BTW Welcome to PF
  4. Sep 21, 2008 #3


    User Avatar
    Science Advisor
    Gold Member

    If you want to run the AC and dryer at the same time, those generators aren't powerful enough.
  5. Sep 22, 2008 #4


    User Avatar
    Science Advisor

    I'm not an expert, and have never done this, but there seems to be very few replies, so here's something I found when I quickly googled your query yesterday (the warnings, pitfalls, and a method for linking the generators):


    When you're trying to put generators in parallel, it's best to use generators designed for this purpose (I think there're a few Hondas that do this). Otherwise, you'll need to match frequency, phase angle, and (preferably) amplitude, or else danger ensues (mostly to the generators, but also possibly to you and your house).

    These aren't exactly the necessities of life, however. If you're going off the grid, or want to prepare for (prolonged) power outages, could you rough it? That or just buy a bigger generator.
  6. Sep 22, 2008 #5
    I think it is a bit dodgy to parellel up two different generators.. Tricky enough if they are identical. Trying to alter frequency and phase with simple generators wouldn't be easy.

    You could get large circulating currents. You would need a syncroscope (expensive??) to get the phasing right and suitable switch gear.

    Why do you need to do it anyway??

    Only other way is the split the load between the two.. Much safer.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook