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school me on generators

Discussion in 'General Questions' started by davidwyby, Sep 24, 2020.

  1. davidwyby

    davidwyby Droppin trees on trailers GoldMember

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    I think I want to get (2) 2000 watt gennys that can be linked to run A/C in RV trailer. Thinking Honda, but looking for other suggestions. Main goal is quiet and quality. Got my mom a 3k and it won't run her AC...maybe my AC is smaller and it will run it and get her the 2ks...

    Thanks

    including this link, first thing google brought up *shrug*

    https://www.averagepersongardening.com/best-2000-watt-inverter-generators/
     
  2. exSW

    exSW 'Cause Thomas is a poopyhead

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    In that size ,Honda.
     
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  3. Larry B

    Larry B Pinnacle OPE Member

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    All depends. You need to look at the specs on your RV AC unit and look for either amps or watts. This will be a running number. Most AC units will draw about 1/3 more than rated when starting. If you have a 4kw (4000 watt) AC unit 2 2000 watt inverter generators will struggle to run it and will probably not start it. Also, do you plan to run lights, microwave or other things too? 4kw will run a smaller RV AC unit but. It the bigger ones. I have a 4kw onan genset in my RV and when i had to replace the AC i had to get one the same size as the old one. BTU size is another indicator of how much power the unit needs.
     
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  4. davidwyby

    davidwyby Droppin trees on trailers GoldMember

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    Think one upside to the Honda is they are 2200, 200 more than the rest

    I will look at wattage requirements for units
     
  5. farminkarman

    farminkarman Pinnacle OPE Member GoldMember

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    I have run and like the Honda's, but I like the Yamaha EU2000i, or the new EF2000iSv2 more. The Yamaha's can be a bit tougher to find, but well worth the hunt.
     
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  6. legdelimber

    legdelimber Super OPE Member

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    This matters if you're going to try feeding a single load with both generators feeding together.

    IF you only need to supply separated, multiple (never mixed together) circuits then the gens don't have to be in sync.

    With two gen-sets, tied together, you'll have to have a way to synchronize the output (wave forms).
    I would think that the inverter types could be equipped with an extra circuit to do that.
    But at what cost? But I'm out of the loop on this stuff now, So for all I know there may be someone who already sells the controls for it.
    Simple in theory but the designer needs to know what they're doing.
    Is the controller built to be durable, accurate and stable ?

    As for the old style generators, you'd have to mechanically couple the shafts and time the rotor phases together, then synchronize the engine speeds to avoid one dragging the other.
    Wouldn't be much fun to do all that and then try to fit them into the camper somewhere.
     
    Last edited: Sep 24, 2020
  7. Nutball

    Nutball Pinnacle OPE Member GoldMember

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    Id think to sync the generators you'd either have to couple the driveshafts and align the shafts to the same timing, hard to do without seeing how the magnets are positioned. Or convert to DC, then back to AC.

    In short, use one big generator.
     
  8. Larry B

    Larry B Pinnacle OPE Member

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    The new inverter generators can be paralleled together with a simple accessory cable. Disadvantage is two 2200 watt generators only gives you about 3700 watts
     
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  9. davidwyby

    davidwyby Droppin trees on trailers GoldMember

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    That's good to know. I would have expected double.
     
  10. Larry B

    Larry B Pinnacle OPE Member

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    Well , it is double but the MAX output for the EU2200i is 2200 watts but the continuous running watts is 1800. So 2 paralleled together will provide 4400 watts for a short time but continuous running watts is 3600. Almost all generators list the max watts for selli g purposes. Always best to check the running watts. Some generators are better than others at voltage sag when a heavy load is applied. My 4000 watt Onan RV generator sags very little when a large load is applied. My 4500 watt portabe generator sags to below 85 volts and takes a few seconds to recover when the same load is applied.
     
  11. davidwyby

    davidwyby Droppin trees on trailers GoldMember

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    Ended up with my mom's honda 3000. Revs up hard and then stalls occasionally when hooked to Rv trailer on ECO. Gonna try some VP engine fix in a can...
     
  12. hotajax

    hotajax Well-Known OPE Member

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    I got a Generac standby for the house - not impressed with the quality. I suggest you look elsewhere. Also, Generac customer service was awful. Within one year, two major parts failed. Even though the unit was under warranty, it took Generac months to send both. In all fairness, these failures occurred 5 to 6 years ago, and Generac customer service may have improved during that period. Nonetheless, I won't purchase another Generac product. Gave me a real bad tasted in my mouth.
     
  13. Sawrain

    Sawrain Super OPE Member

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    Non inverter type alternators are easy to synchronise, as long as the units to be be “paralleled” are of identical performance.

    Older installations still have manual backup synchronisation that consists simply of lamps situated between the incoming generator (alternator) phases and main bus to indicate if the incoming generator is in phase with the main supply/bus or not.

    Basically depending on the arrangement you could tell if the AC waveforms of the incoming and system voltage per phase were matched, and as such synchronised, usually the incoming generators is at a slightly higher rpm so it will take load when connected, so the sync lamps will be slowly fading in and out as you pass through being synchronised and out of sinc.

    When generators are connected in parallel the spinning rotors of the alternators are effectively magnetically coupled to each other, no more steps need be taken to keep each unit in phase.

    Though the engine Governors and voltage regulators have to be matched/adjusted to ensure equal sharing of power (kw) and current (kvar).

    A modern style of manual synchroniser has a ring of leds to indicate the difference in phase angle between incoming generators and the main bus, only one led lights up at a time for a spinning effect, showing the difference in rpm and phase angle, you adjust rpm to have a slow clockwise rotation and connect when the top led indicates synchronisation.

    0E0E059C-BD7D-40D3-9271-1E7FD471409A.jpeg

    I’m not really recommending it be done, but matching domestic non inverter generators can be diy paralleled without much trouble, the most likely problem would be if the voltage regulators didn’t have the same characteristics, this would lead to one of the alternators taking more that it’s share of current, even if the driving engines have their loads equally matched (by the governors), would be best to use a cheap eBay power meter to monitor each alternators output.
     
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