It all depend on yr load,Gen.set capacity and mode of operation.If one single generator has d capacity to handle yr total load at a time and u wanted it so,then u need nt run 2 Generators in parallel,but only one.But if none of yr generators can carry yr total load at a time,then u need to run the 2 Gen.sets in parallel wt good synchronisation,if both is capable to handle yr total load.

Though d second question seem nt clear to me or nt properly expressed,but if u mean using d generator to operate at minimum power consumption,u need to run only one sizable generator for the amount of load u want to operate.Also,u save fuel,maintenance and associated costs than when running 2 gen.sets on synchronised bursbar or seperate bursbar.

On the other hand,if u are talking of minimising power consumption wt yr equipments(ie loads),then appropriate starters nd to be used if loads involve motors.U may also nd a power factor correction panel to reduce yr power consumption.Also ensure that only very useful loads are in operation,to reduce yr power consumption.

Patrick Whowha

hi patrick,

First of all i would like to thak you for ur satisfactory answer given to me.

now i have to know more about what is hunting in Diesel genrator ? and their causes & solution for hunting.

now i will tell you about my second que for which u were not clear.

you know today saving of electrical power means generating electrical power, so what r the new techanic or electronics equpments can be used for power saving.

and also how can we reduce the generating power loss in diesel gen set?

1. Hunting can be caused of various reasons,it could be your diesel engine governor malfunction,continously changing loads,water in fuel or choked fuel filter,AVR (automatic voltage regulater) malfunction (normally potentiometer part).
2. There are various type of power management systems.Iam a marine engineer and can tell only about marine power installations.Here big customers like bow thruster have lock ins which will start only when sufficient generators on board,when the BT is switched off,the no 0f generators are so reduced that one genereator is atleast 80% loaded. when load exceeds that, other generator starts automatically.But for frequently changing loads we normally switcch of the PMS.
3. power loss prevention is a manufacturers worry.An alternater kept at good condition,(good insulatio,clean air filters and coolers) will operate in optimum condition
   

Good synopsis of some causes of generator hunting (or surging).

My field experience in one of our military site which is far from commercial power. We installed generating plant.

Size your gen set enough to carry the actual connected load at peak load. But dont load your get set more than 85% of its capacity and dont run it with less load or less than 50-60% of its capacity to avoid over running.

For example If you have 80kw connected load, you can use 100kw gen set or two 100kw gen set continous duty type. The purpose of one gen set is stand-by unit just it case one gen set is break down or any means of maintenance S.O.P. Of course this two gen set equiped with transfer switch to be coupled into your MDB switch gear.

The disadadvantages of one unit system of large size gen set is uneconmical because if you have less load , and to avoid gen set to over running more than at normal RPM.

1. You need to add more loads or load banks( these is dummy load or wasted load) to attain 60% load.

2. Large gen set consume more fuel.

3. There is no back up power once it will breakdown.

as far usefull work, make sure you monitor the pf of the generators. ALso consider the grid (if available)

you may want to share the load with the grid. Run the loads on the grid when the kWh is least expenssive usually at night.

Check with your utility for rates and pf limits.