SGS supply an assortment of portable petrol generators to provide electrical power for a variety of uses. Our models range from heavy-duty yet portable generators, ideal for emergency back-up situations, to smaller portable models, suitable for camping and caravanning. Our range include SGS built models, UK made Stephill generators with Honda engines and the full Hyundai range of generators. View our Generator Selection Guide for help choosing a generator.
A portable electric generator is a machine that can convert kinetic energy into electricity. Petrol provides the kinetic energy to power the engine and this in turn powers the alternator which converts the rotational power into electricity.
Petrol vs Diesel vs Inverter
When it comes to choosing a portable generator, you’ll have three basic options; petrol powered, diesel powered or an inverter generator.
Petrol generators tend to be cheaper to initially purchase, however a diesel generator will give you a considerable saving over the life of the product - especially if you have access to red diesel. Diesel engines are designed to stand up to more regular usage, so if you need to run a generator every day, we’d recommend a diesel.
As a rule, if you’re looking for a generator for occasional use and have a power requirement of under 10 kVA - go for a petrol generator. Choose a diesel generator when you require 10 kVA+ or you need to use the generator regularly.
Inverter generators tend to be smaller units, designed for camping and light hobbyists. They produce a “clean” output by “inverting” DC energy back to AC power. This means you can power things with a microprocessor, such as computers, phones, games consoles, etc, without the fear of damaging them.
Performance measurements of a generator:
Power produced, measured in kW (Kilowatts) or kVA (Kilo Volt Amperes). Typically, the max output power (the start-up or peak power that the generator can produce) is quoted, as well as the rated power output.
How the generator is started – either recoil (a pull cord) or electric.
Engine size measured in HP (horsepower). This is closely related to the the run time of the generator, typically quoted in hours at 50% load and 100% load.
Weight of the generator (a 100 kg 10,000W generator probably isn’t suitable for camping!)
Choosing a petrol generator
With so many different petrol generators for sale, choosing one can seem like a daunting task. However, with a few simple steps you can confidently select a generator that will be appropriate for your requirements.
Step 1 - Identify the tools and appliances you wish to operate.
Step 2 - Find the required Watts for each item from the data plate attached to the item.
Step 3 - Add up the Watts of each item that will be running simultaneously.
Step 4 - Find a petrol generator for sale that has a rated power that meets or exceeds the total Watts.
When powering an induction type motor, the max output must also be considered as they require 2-3 times their listed Watts to start. Induction motors can be found in compressors, refrigerators and pumps.
With so many different generators for sale, choosing one can seem like a daunting task. However, with a few simple steps you can confidently select a generator that will be appropriate for your energy requirements. We've put together these how-to guides to help you get started with our range of portable generators.