Expert Insights on Power Solutions and Generator Technology

Starting a three-phase motor on a generator is usually filed as a sizing question. It is a buying question. The set has to deliver the motor’s starting demand rather than its running load, and that demand can be several times the steady figure. But on most sites, cutting the demand with a starter costs less than buying a set large enough to absorb...

The machine was cheap because nobody else could plug it in. Used three-phase equipment sells at a discount in most markets for one reason: most buyers have a single-phase supply, and powering the machine costs more than the machine did. So you are weighing up phase converter vs generator. Almost every page on that question was written by someone who...

Three-phase generator amps are not a fixed number. They depend on the rating and the voltage, so a 100 kVA set delivers about 152 A at 380 V, about 144 A at 400 V, about 139 A at 415 V, and about 120 A at 480 V. Same machine, same rating, four different current figures. That is the part most conversion charts leave out. A chart that lists one column...

The single-phase vs. three-phase generator question is usually settled before you start shopping, and it is rarely settled by the generator. A three-phase generator delivers about 1.73 times the power of a single-phase set at the same current per conductor, which is why three-phase becomes the default as ratings climb. But what actually decides the...

A three-phase diesel generator produces three alternating voltages offset by 120 degrees, and delivers about 1.73 times the power of a single-phase machine at the same current. That is the standard definition, and it is where most guides stop. Here is what they leave out. The three-phase output changes what your site can run, how much current your switchgear...

A generator coolant temperature alarm is not one device. It is at least two: an analog sender that reads temperature and can drift, and a switch that trips at a fixed point and cannot. Which one fired decides whether you spend the afternoon on the engine or on the wiring. Most operators never make that distinction. The alarm says high coolant temperature,...

Yes, you can recover heat from a diesel generator. But only within a narrow band of temperatures the engine will tolerate, and only if the set runs enough hours to pay back the equipment. Miss either condition and generator heat recovery stops being an efficiency project and becomes an expensive one. The pitch you have probably read goes like this....

Generator heat exchanger cooling is a liquid-to-liquid method of rejecting engine heat into a separate water loop instead of into air. A shell-and-tube exchanger takes the place of the radiator and fan, so the engine’s jacket water transfers its heat to a second water supply: city water, a cooling tower loop, building chilled water, or the sea....

A generator block heater, also called a jacket water heater, is a thermostatically controlled electric element plumbed into the engine’s coolant circuit. It holds jacket water at roughly 100 to 120 °F (38 to 49 °C) while the set sits idle, so a standby diesel can start and accept full load within seconds on the coldest night of the year. Here’s...

Most generator nameplates already assume a hot day. A typical industrial set is rated for full output at a 40 °C ambient, so a high ambient temperature generator site, one that sees 45 to 50 °C for months, starts every summer above the line the machine was quoted on. The double squeeze catches most owners only when alarms start: the engine makes less...