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Need for 230V at 40 amps How do you know if your generator is large enough?
Wiki User
∙ 15y ago
Have you looked on the genny for a specification plate. if there is one, it should state the power rating and from this you can calculate the current by dividing it with the voltage. Or it might even give a current rating.
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240V times 40 Amps = 9600 Watts
So, 9600 watts is the minimum you will need (note 10,000 watts would commonly be referred to as 10 KW).
But here are some things to consider.
The big number on the side of the generator is often the maximum surge wattage that the generator can supply. If you need to run at full load for any length of time (more than a second or two), then make sure the generator is rated for 9600 W or more "continuous".
Second, make sure the 240V outlet on the generator can carry the full load. It probably can, but it's possible that the 240V outlet will have say a 30 amp breaker on it.
If you need to start a large motor (maybe on an air compressor), the starting current can be VERY high. To start an electric motor, you will likely need a generator that is 2 or 3 times bigger than is needed to run the motor.
Finally, inexpensive generators may exaggerate their ratings a bit. If you are running very close to the generators maximum rating for extended periods, you may blow the breakers, or overheat the unit. It's also likely that the voltage will drop a bit as you approach the maximum output. Low voltage can damage some things.
Wiki User
∙ 15y ago
To determine if your generator is large enough to handle a load of 230V at 40 amps, you need to calculate the generator's power output capacity in watts. Use the formula P (watts) = V (volts) x I (amps) to find the required wattage, which in this case would be 9200 watts. Check your generator's rated power output capacity to ensure it can handle at least 9200 watts without overloading.
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