I doubt "Kubota" has anything to do with it, unless the complete genset is actually made by Kubota. It's probably a unit just using a Kubota engine, and why it's hooked that way, I can't tell without seeing complete specs.
I do know this. I've been researching (and installing) gensets for solar apps for quite a while. Efficiency has been a big issue along with perfect sine-wave power, which many faster rigs do not make. I've yet to see any fast running gensets that run as efficient as the slow ones. I posted specific fuel consumptions specs on those. I'd like to see the specs on whatever this Genset is with the Kubota engine turning 3000 RPM against the belt-drive 3600 RPM head. The only time (I'm aware of) that an engine is not most efficient within its torque curve, is when it is not sized for the job properly. Peak efficiency calls for matching the desired load and running within the torque-curve at the same time. That's why big farm tractors are dogs on fuel when used for small jobs with low power demands.
My main comment was about the reason why some gensets have fast running engines. I still maintain it is because it's the cheapest way to build, and not for more consisitent power. It's also why RV gensets are so expensive. They have to use more engine, running slower, instead of less engine, running faster.
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