100 kva generoter no power out put how can maintain ?

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it could be just that it needs the rpm adjusted to maintain the 220-240 volts under load
if you have a large air conditioner , then it will be at the load limit for the average 7.5 kva gen set which has a max constant output of 6 kva
you can get the wattage requirement of the ac from the specs plate on the outside unit

A 5.5 KW draw needs a 5,500 kva generator. Think in thousands.

yes
the adjustment is by the rpm setting on the governor spring
thee is a nut that you adjust the spring tension with and lower the rpms and watch the voltage gauge until you get the desired voltage
if the load is going to be constant but is well within the rated capacity( example 2kva of a 6.5 kva set) of the gen set then the variation when the load comes on will be less than 5 volts
however if the power required is close to the max capacity of the gen set ( example 4.5kva of a rated 5 kva set) , then turn the unit on and adjust the rpms up to the required voltage required
remember that an advertised kva is not the rated kva
rated kva is what the gen set will produce all day and is normally around 1kva less than advertised kva
so if you have a 6.5 kva gen set ,it will handle current peaks to 6.5 kva but will burn out if required to run long time at that load
if the gen set is 1000 watts then rated watts will be less ( 750-800) for long time use

the unit has gone into over load
The total power requirement has exceed the output of the generator
for example if the generator is a 2.500 kw or kva then it will generate well at 1.8 kva or kw but it will not run forever at 2.5 kva -kw
When a ac is running the power requirement will be constant on the generator and with the fridge as well then the load will be at the maximum out put of the unit.
when the fridge starts again the extra load will exceed the max out put of the generator and it will slow down ( lights dimming ) and eventually go into overload mode
have an accredited electrician calculate your maximum load requirement for an external power supply and then get a unit that is at least 15.. kva kw better that required
generally fridges use 1000watts , ac conditions will draw over 3000watts and any thing else adds up . I am guessing that your generator is only 2500 unit

talk with the gen set manufacturer
The question here is , you are fitting a different alternator to an engine so is the engine of sufficient torque to maintain 85% capacity under full load of the alternator
25KVA extra requires more HP than a 100 kva so that should be the first consideration
Is the engine big enough to run the bigger alternator

philliprabay,

This is the formula The conversion of W to KVA is governed by the equation KVA=W/(1000*PF)


For example 1500W/(1000*0.83) = 1.8 kVA (assuming a power factor of 0.83)
Thanks for using FixYa and for the great rating.

hardrocko

kva = kilo-volt-amps

watts = volts x amps = va

Therefore, 5.8kva = 5800 watts