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Generator Wet Stacking: What It Is and How to Avoid It
Wet stacking happens when a diesel engine runs at a very light load for long periods. The engine does not get hot enough to burn all the fuel, so unburnt fuel and soot build up in the exhaust and engine.
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Signs
- Black, oily residue at the exhaust outlet
- Oil or fuel dripping from the exhaust
- Rising oil consumption and smoky running
- A set that struggles when the load finally rises
Causes
- A generator that is much larger than the real load
- Long idle runs with almost no load
- Short test runs that never bring the engine to temperature
- Poor injector condition
Fixes
- Run the set under a higher load for a period, using a load bank if needed
- Right-size the generator to the real load
- Use two smaller sets that share load, so each runs at a healthier level
- Service injectors and the fuel system
Prevention
- Size the set so typical load is roughly half to three-quarters of its rating
- Do not leave a set idling for long when it is not needed
- Schedule periodic load tests for standby sets
Frequently Asked Questions
Is a bigger generator always safer?
No. A set that is far larger than the load runs lightly loaded, wastes fuel and can wet stack. Size to the real load.
What is a load bank?
An external device that places a controlled electrical load on a generator so it can be tested and brought up to working temperature.
Generators in our store
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NewCummins 1500 kVA Diesel Generator (New)
LagosAvailable to order
- Rating
- 1500 kVA
- Fuel
- Diesel
- Phase
- 3-phase, 50 Hz
- Enclosure
- Container
UsedCummins 1500 kVA Diesel Generator (Used)
LagosInspection on request
- Rating
- 1500 kVA
- Fuel
- Diesel
- Phase
- 3-phase, 50 Hz
- Condition
- Used
NewPerkins 500 kVA Diesel Generator (New)
LagosAvailable to order
- Rating
- 500 kVA
- Fuel
- Diesel
- Phase
- 3-phase, 50 Hz
- Enclosure
- Canopy
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