The Sportsman may not be the shining example of a well-designed synchronous generator. But even if you had tested against a better made model, I think inverter will generally match or beat any synchronous on small-scale tests, especially at anything other than full load. 0.20 vs 0.28 GPH with a 900W load seems about right to me. Fuel injected inverter models can further advance fuel economy, at added upfront cost.

@richardbaker3621

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Thanks for your comment

@robertkubrick3738

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Fuel injection for either style generator would be the holy grail for efficiency and in my opinion would pay for itself quickly in fuel savings. A water jacket that could be optionally filled, or not, would aid in cooling and noise reduction, adding little to expense or weight.

@richardbaker3621

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@@robertkubrick3738 Thanks for your comments. Fuel injection has certainly improved auto efficiency. The water jacket is an idea that is new to me. I can believe that the mass of the water might reduce noise.

@robertkubrick3738

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@@richardbaker3621 It would. Also it isn't a requirement that you fill it and it could be drained when lifting or moving and refilled later, just needing a pressure relief valve. As it stands now, temperature of air cooled carbureted generator engines is partly fuel moderated. They run rich. With better cooling they could have a higher compression ratio and better efficiency.

The Sportsman was massively more efficient operating at 90% load than it was at 45% load for the power produced, you proved that old observation at least. The Wen looks fairly new? It might improve in efficiency when it gets a couple hundred hours on it. I would measure by a different metric, watts produced vs. fuel consumed, to measure efficiency, since loads vary as you have demonstrated, hours under load isn't a good metric. It was still and interesting video.

@richardbaker3621

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Thanks for the positive reply. At the time of the test the Wen probably didn't have more than a couple of hours on it.

@robertkubrick3738

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@@richardbaker3621 It looked really fresh to me. I think it will do a little better after 20 more hours operation.