Based on your total load power (KW), estimate the power factor as 0.8 and take the load factor as 0.8. For example: your total load is 500 KW and the load factor is 0.8 (it is better not to run the generator at full load). It is estimated that there are very few generators of this type. so you can only buy 800KVA generators.
No.
A 3 KW generator is not actually 3 KW. Look at the power coefficient on the nameplate. It is clearly written on it.
The instantaneous current of the water pump at start-up is approximately 3 times the rated current. A 1.1 kW machine may not start with a 3 kW generator. Even if it can start, the machine will be held up when starting. time of startup. If the generator is lower, it can also be burned.
It is estimated that your generator can drive a 0.75 kW water pump.
The generator3KW should be a gasoline engine. Gasoline engines are relatively expensive. Buy a larger, fuel-efficient and stable single-cylinder diesel generator!