Quick Answer
Propane generators generally require 20-30% more startup power than gasoline generators, due to the lower energy density of propane. This translates to a slightly larger and more powerful engine to achieve the same output. Propane generators also require a richer air-fuel mixture for starting.
Engine Size and Type
When considering a dual-fuel generator, it’s essential to look for a model with an engine that’s specifically designed for both propane and gasoline use. These engines typically have a larger displacement and more powerful ignition system to compensate for the differences in fuel characteristics. For example, a 7-kilowatt dual-fuel generator might have a 420cc engine, whereas a gasoline-only generator of the same size could have a 350cc engine.
Starting System and Ignition
The starting system of a dual-fuel generator is also critical to ensure reliable startup on propane. Many dual-fuel generators use a richer air-fuel mixture during starting, which can be achieved through a combination of a more powerful ignition coil and a larger fuel injector. Some high-end models may also feature advanced starting systems, such as a dedicated starting circuit with its own fuel injector and ignition coil. This ensures that the engine receives the right amount of fuel and air to start reliably, even on propane.
Startup Power Requirements
The startup power requirements for a dual-fuel generator can be significant, which is why a larger and more powerful engine is often necessary. When choosing a dual-fuel generator, it’s essential to consider the startup power requirements and ensure that the engine is capable of delivering the necessary power to start the generator reliably. As a general rule, a dual-fuel generator should be able to start on propane at a minimum of 50-60% of its rated output, and ideally at 70-80% of its rated output.
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