Proper sizing depends on three key factors:

1. Load type – resistive (lighting, heaters) or inductive (motors, pumps, compressors). Inductive loads require 3–6 times their running power for starting.

2. Total running load (kW) and largest single motor starting kVA – the generator must handle the latter without a unacceptable voltage dip.

3. Altitude and ambient temperature – derate power by 3–4% per 300 m above 1000 m and by 1% per 5 °C above 40 °C.

Always perform a load study and consult a professional. Oversizing wastes fuel; undersizing causes voltage/frequency instability and premature failure.

- Standby (ESP - Emergency Standby Power) - For emergency use during utility failure. Max 200 hours/year, 80% average load, no overload allowed.

- Prime (PRP - Prime Power) - For variable loads with unlimited hours of operation. Average load ≤70% of prime rating, with 10% overload capability for 1 hour every 12 hours.

- Continuous (COP -Continuous Power) - For constant, non-variable loads, unlimited hours, no overload capability.

Choosing the wrong rating leads to warranty void or engine damage.

Standard intervals:

- Oil & filter - Every 250 - 500 running hours or 6 months, whichever comes first. Use API CK-4 or CJ-4 oil.

- Fuel filter - Every 250 hours or annually.

- Air filter - Inspect every 200 hours; replace at 1000 hours or when restriction indicator shows red.

For standby sets with low hours, change oil at least once a year because condensation and acids accumulate even without running.

White smoke indicates unburned diesel fuel vapor. Common causes:

- Low cylinder compression (worn piston rings/valves)

- Low coolant temperature - glow plugs or intake heater not working

- Faulty injectors - dripping or poor atomization

- Incorrect injection timing

A small amount of white smoke in cold weather for 5-10 seconds is normal. If it persists longer or occurs in warm conditions, stop the generator and inspect the injection system and glow plugs.

To maintain reliability:

1. Run under at least 40-50% of rated load-no-load running causes wet stacking (unburned fuel buildup).

2. Duration: 30-60 minutes every 2 weeks.

3. Let the engine reach stable operating temperature (coolant ≥80 °C / 176 °F) before loading.

4. Monitor oil pressure, frequency (Hz), and voltage during exercise.

5. After loaded run, cool down for 5 minutes at no load before shutdown.

Monthly load banking (≥75% load for 1 - 2 hours) is recommended if the set rarely sees high loads.

Diesel degrades due to oxidation, microbial growth, and water contamination.

- Storage - Use clean, sealed, opaque tanks; keep water out (drain condensation monthly); add biocide and stabilizer.

- Shelf life - Standard diesel: 6-12 months; treated with stabilizer: 18-24 months.

- Testing - After 6 months, check for haze, sediment, or bad smell. Do not use fuel that fails clarity test.

Always rotate fuel (first-in, first-out) and filter before the fuel tank.

At 1000 hours (or 2 years), in addition to oil and filter changes:

- Replace fuel filters (both primary and secondary)

- Check/adjust valve lash (clearance)

- Test coolant concentration - top up with ethylene glycol anti-corrosion mix (50/50)

- Inspect and clean the radiator fins and crankcase breather

- Replace air filter element

- Test battery - clean terminals and check electrolyte level (if wet type)

- Perform a load bank test to verify full power output and exhaust gas temperature

Follow the OEM maintenance schedule-skipping  1000-hour tasks leads to overheating, loss of compression, or injector failure.

Common causes for start-then-stop (shutdown within 3-10 seconds):

1. Low oil pressure - check oil level; faulty oil pressure switch or sensor.

2. High coolant temperature - false reading from thermistor or air in system.

3. Overspeed - governor failure or magnetic pickup sensor misalignment.

4. Loss of magnetic pickup (MPU) signal - sensor gap too wide.

5. Fuel solenoid not staying energized - faulty fuel stop actuator or control circuit.

Check the controller’s fault code first. Never bypass safety shutdowns - they protect the engine from catastrophic damage.