below second-hand Cummins diesel generator series :
6BT5.9-G2, 85kw, 
6CTA8.3-G, 120KW, 140kw,150kw
LTA-10G3,  200kw, 220kw
NT855-G6,  250kw
NTA855-G4, 310kw
KTA19-G4,   450kw
VTA28-G5,   550kw
KTA38-G5,  660kw, 880kw
QST30-G4,  880kw

Cummins engine generator set is a set of complete equipment for electrical power supply. Cummins engines, high quality alternators and advanced full automatically control system are produced through strict test, which together provides reliable power no matter as standby, prime or continuous use.

High fuel efficiency: Fewer fuel consumption at leading level than other competitive products.
The turbocharger with waste gated design: Optimizes operation across the torque curve resulting in excellent low-end torque.
Compacted yet durable and dependable engine: Cummins engines contain up to 40% fewer parts than competitive engines in its class. This results in a better power-to-weight ration, a less chance of failure and lower repair cost.
Advanced design and manufacturing: Make the engine delivers superior performance and lower cost than competitive engines.
Excellent cold start performance: Optional assistant cold starter with improved 6.6KW starter and intake air heater.
Excellent performance and advantage: Adopt advanced design to achieve higher horsepower and lower weight.