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DC Generator instead of AC Inverter type?

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  • DC Generator instead of AC Inverter type?

    We live off grid & have a small PV array, Trace SW4024 inverter, 60A MPPT charger, 24V battery bank (12 x 2V), & a Yamaha EF4400iS inverter type generator. I noticed these DC generators can offer much more amps (for a given size) to charge the batteries:

    https://www.altendc.com/g3-gasoline-...g-dc-generator

    Is this type of genset compatible with an off grid system?

  • #2
    Those look fine, but make sure they will supply the 58-65VDC batteries need under varying conditions. If they are "48v power supplies" that won't work well when a 48V bank needs 58V for charging. Do they have a charge regulator, or how do you adjust the voltage/amps ? Engine Speed ?
    Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister

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    • #3
      They are essentially an automotive alternator bolted to a honda engine, I have used a few over time and did set up similar for charging Traffic lights for road works, before solar and lithium.

      The ones I used for the lights had a standard internal regulator, I had fitted an external adjustable regulator so I could set it 15v rather than the standard 13.8 to charge faster.

      Big difference between your Yamaha inverter genset and the GX honda engine will be fuel consumption and noise. The inverter will throttle back engine RPM as load decreases the GX honda will run a a preset RPM.

      The honda in petrol form is easy to work on and maintain. I have not worked on LPG Honda engines for a very long time so cant comment.

      The alternator itself will be reliable and any auto electrician can repair or replace it.

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      • #4
        Thx for the input. Our Yamaha inverter generator does not throttle, and runs at constant rpm no matter what load it sees. My interest in the DC units is charging amps: our 4kW Yamaha can output a max of 30A but the little DC Honda G3 24V model can output 80A -- a huge difference. I'd need a 12kW inverter genset to get the same amps.
        Last edited by ron_jeremy; 09-09-2020, 08:48 PM.

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        • #5
          The model you are looking at has a Honda GX200 engine, that engine started as a GX140 and they increased bore and stroke over the last 30+ years to increase horsepower. I have worked on most stationary engine and these are my favorite for reliability. I own a few. With frequent oil changes and a valve clearance check every now and then it will last a long time.

          They list its run time at approx 4hrs, so that is approx 3 litres, or more of fuel in 4 hrs. They have a gravity feed fuel system so you can easily fit a larger extra fuel tank.


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          • #6
            Originally posted by ron_jeremy View Post
            Thx for the input. Our Yamaha inverter generator does not throttle, and runs at constant rpm no matter what load it sees. My interest in the DC units is charging amps: our 4kW Yamaha can output a max of 30A but the little DC Honda G3 24V model can output 80A -- a huge difference. I'd need a 12kW inverter genset to get the same amps.
            I think you're confusing AC and DC output here. Your Yamaha outputs 30A *AC* at 120V. If you had a bigger inverter with a charger, you could take that 30A/120V AC input in and convert it to DC 24V at ~150A to charge your batteries. From what I see of the Trace documentation, yours should be able to charge at 120A which is likely OK for you.
            Last edited by extrafu; 09-10-2020, 01:28 PM.

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