Part 5 – Making the right generator choices

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Modern generators come with a range of improvements compared to older models, such as turbocharging, compactness, affordability, increased efficiency, and the ability to reach full capacity within seconds. Moreover, they offer a diverse array of fuel options.

Among generator types, diesel generators are widely preferred. Diesel fuel is popular due to its low fire risk and long-term stability. Additionally, diesel-powered generators often offer the most cost-effective solution in terms of upfront expenses.

Where accessible, natural gas serves as a popular alternative. However, natural gas generators require a larger engine size than their diesel counterparts to compensate for the lower energy content of gas compared to gasoline or diesel. One advantage of using natural gas is the elimination of the need for a fuel tank, as the fuel is directly supplied through the main gas line, ensuring a continuous and uninterrupted fuel source.

Using natural gas generators may have drawbacks. If there is no existing large gas main, the installation cost can be high. Moreover, if the main gas supply is disrupted, it becomes an uncontrollable situation, leading to unexpected power outages.

Weight is a crucial consideration for generators. A 100kVA generator weighs approximately 1.7 metric tons before factoring in fuel. The fuel tank size varies depending on usage requirements, but it is advisable to allocate one kilogram per liter of diesel fuel to err on the side of caution regarding weight.

Consequently, the placement of the generator is vital. Ground-level installations, such as in a parking lot, do not pose weight concerns. However, when installing within a building or on a rooftop, it is essential to strictly adhere to the load-bearing capabilities of the structure.

When considering indoor or rooftop installations, refueling logistics must be taken into account.

Exhaust, noise, and heat emissions are factors to address. Internal combustion engines emit carbon monoxide (CO) and noise, necessitating proper ventilation. It is recommended to keep the exhaust pipe length below 10 meters and position the exit away from windows and air intake vents to ensure adequate ventilation.

Acoustic hoods and weather-proof enclosures can help reduce noise to an acceptable level for outdoor use. Diesel generators can also be equipped with catalytic converters within the silencers to minimize chemical and noise pollution. It is important to note that these converters operate at temperatures ranging from 200°C to 300°C and require thermal insulation.

Since diesel generators are typically air cooled, additional cooling and ventilation measures, such as forced air cooling, may be necessary in the immediate vicinity of the generator.

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