Hyundai 34kVA Three Phase Diesel Generator

Charging power tool battery packs from a conventional generator is fine. For smoother charging and better results, keep a steady load on the generator and avoid running appliances that cause the load to jump around while the batteries are on charge.

Between diesel and petrol, diesel generators generally operate at lower temperatures and lower RPM than petrol units. That reduced operating stress can mean less wear and tear, especially when the generator is used often or for longer run times.

Underloading is a common issue with diesel generators because the engine needs a meaningful load to reach its optimum operating temperature. If it runs too lightly loaded, some fuel may not burn properly, leading to soot build-up. Over time, soot can contribute to cylinder bore glazing, sticking piston rings, reduced compression, and carbon build-up on injectors, which can worsen incomplete combustion.

Early signs of underloading problems include heavy smoke from the exhaust. If it continues, unburnt fuel can condense in the exhaust and mix with soot to form a thick, dark liquid that can look like an engine oil leak. This can seep from the exhaust and may build up in the exhaust silencer, with a risk of ignition if the generator is later run under full load. Ongoing operation with little or no load can potentially cause permanent engine damage.

To avoid underloading, size the generator to match the actual requirement without oversizing. If extra capacity has been added for future needs, or the existing installation regularly runs below capacity, a load bank testing program should be used. A load bank creates an artificial demand, typically between 75% and 100% of prime load, which helps burn off carbon deposits and can extend generator life. A common guideline is to run the generator at around 75% of prime power for 2 hours in every 100 hours of use.

For safety, never run a generator in an attached garage, even with the door open. Position it so exhaust fumes cannot enter the home through windows, doors, or other openings, and make sure the exhaust is directed away from the building.

If a diesel generator won’t start, the most common causes include battery failure, low coolant levels, an incorrect or poor-quality fuel mix, or the controls not being set to auto.

Some white smoke on start-up can be normal for all but the most modern diesel engines, as long as it clears once the engine warms up. Ongoing smoke after warm-up can indicate another issue that needs attention.

Preventive maintenance should include regular general inspections of coolant level, oil level, the fuel system, and the starting system. Charge-air cooler piping and hoses should also be checked for leaks, holes, cracks, loose connections, and any dirt or debris that may be blocking the fins.

It’s not recommended to let a generator run completely out of diesel. Running out of fuel can cause the generator’s coils to lose their magnetism, as the appliances being powered can drain residual magnetism when the load stops abruptly.

A diesel generator is made up of several core systems, including the diesel engine, fuel system, voltage regulator, cooling system and exhaust system, lubrication system, battery charger, control panel, and the main assembly frame or skid.

Many diesel generators run at 1500 RPM because the slower engine speed is typically less stressed than higher-speed models. That makes them a strong choice for fixed installations used for daily prime power and standby operation, with well-maintained units often achieving 10,000+ running hours.