How to choose a generator (guide-navigator)
The question “which generator should I buy?” does not have a single answer — the right solution depends on the specific scenario. Backup power for an apartment during scheduled outages, complete energy independence for a country property, or uninterrupted operation of a production line require three different solutions, even though they are all called “generators”.
This guide will help you make your choice based on 4 key criteria and select a specific type of equipment, rather than simply choosing “something powerful and reliable”.
Step 1. Choose a Generator by Fuel Type
The fuel type determines the starting cost, fuel availability and ease of operation in the long term.
Petrol Generators
The most affordable option, compact and easy to maintain. They are ideal for occasional use — several hours a day during power outages, rather than for continuous operation. Fuel is available at any petrol station, which is convenient for mobile applications.
Go to the petrol generator catalog
Diesel Generators
They can withstand long operating cycles without reducing engine service life, are more economical under constant load and are better suited for sites with high power consumption — production facilities, construction sites and commercial premises.
The longer engine service life compensates for the higher initial cost when the generator is used frequently.
Go to the diesel generator catalog
Gas Generators
They operate on natural gas or LPG. With regular use, they can provide a lower cost per hour of operation and eliminate the need to constantly refuel and store fuel on site.
The optimal choice if a gas supply is already connected to the property.
Go to the gas generator catalog
Inverter Generators
This is a separate class based on the principle of output voltage stabilization, rather than on the fuel type. Inverter models use electronic systems to stabilize voltage, which is especially important for sensitive equipment.
An inverter generator can, for example, run on petrol while additionally using an electronic stabilization system and, as a rule, sound insulation.
Go to the inverter generator catalog
Step 2. Choose a Generator by Power: Home, Country House or Business
Power is the main reason for disappointment after purchase: insufficient power does not allow the required equipment to start simultaneously, while excessive power means overpaying for capacity that will not be used.
- Generator for home — the calculation is based on the total load of essential appliances: lighting, refrigerator, boiler, router and other necessary equipment, taking into account the starting current reserve.
- Generator for a country house — a lower power rating is often sufficient than for a permanent residence if the property does not have a high load. Compact petrol or inverter models are suitable in this case.
- Generator for business — the calculation is based on the production or office load, taking into account the starting currents of equipment: compressors, machine tools, refrigeration equipment and other consumers.
If you are not confident in your own calculations, SmartGrid engineers can accurately select a generator and calculate the required power based on the specific list of equipment.
Step 3. Choose a Generator by Noise Level
Noise level is critical for residential areas, hotels, medical facilities and offices, where the generator may operate close to people.
A silent generator is generally an inverter model with an additional sound-insulating enclosure, rather than a separate engine category.
- If the property is located in a residential area or there are neighbors or personnel nearby — it is worth choosing a quiet generator from the inverter segment.
- For remote production sites, noise level is usually a secondary criterion. Priority shifts to power output and engine service life.
Step 4. Choose by Application: Domestic or Industrial Generator
Domestic and industrial generators differ not only in power output, but also in continuous operating life, protection class and maintenance requirements.
- Domestic generator — designed for occasional use, easier to maintain and more affordable.
- Industrial generator — designed for long-term continuous operation, has a higher protection class and often requires scheduled maintenance in accordance with the manufacturer's regulations.
After installing any type of generator, professional connection to the property's electrical network is recommended. Equipment installation and connection will help ensure safe connection to the electrical network.
Regular technical maintenance and generator repairs are carried out as part of commissioning and service services.
Comparative Table of Generator Characteristics
| Criterion | Petrol | Diesel | Gas | Inverter |
|---|---|---|---|---|
| Optimal operating mode | Occasional, several hours | Long-term / 24/7 | Long-term, with gas supply available | Occasional, for sensitive equipment |
| Noise level | Medium | Higher | Medium | Lowest, silent models available |
| Initial equipment cost | Lowest | Higher | Medium / higher | Higher than a petrol equivalent |
| Operating cost per hour | Medium | Lower under constant load | Lowest when gas is available | Medium |
| Output voltage stability | Standard | Standard | Standard | Highest, for electronics |
| Typical application | Home, country house, short outages | Business, production, construction site | Property with a gas supply | Apartment, office, sensitive equipment |
Frequently Asked Questions
What Generator Power Do I Need for a Home?
A basic guideline is the total power consumption of essential appliances: refrigerator, lighting, boiler, router and other necessary equipment, plus a 20–30% reserve for the starting current of the most powerful consumer.
If the list includes equipment with a high starting current, such as a pump or air conditioner, it is better to entrust the exact calculation to a specialist.
How Does an Inverter Generator Differ from a Conventional Generator in Terms of Fuel?
These are different classifications: petrol, diesel or gas determine the fuel and engine type, while inverter technology is responsible for stabilizing the output voltage using electronics.
An inverter generator can run on petrol while additionally using an electronic voltage stabilization system.
Can a Home Generator Power Industrial Equipment?
This is not recommended for regular operation. Domestic generators are not designed for long-term continuous operation or the starting currents of industrial equipment.
Businesses require a separate calculation and selection of an industrial-class generator.
Conclusion: How to Choose the Right Generator
Choosing the right generator means combining four key parameters: fuel type, power output, noise level and application.
If you still have doubts about a specific model for your property after reading this guide, SmartGrid engineers can help you choose the optimal solution.
