Just wondering what you mean...
Perhaps you meant a 1,000 WATT generator, in which case the answer would probably be "No". That's not enough capacity to run most freezers at start-up.
If you actually did mean a 1,000 AMP generator, you would need to specify the voltage and amps or the watts of the generator and current draw of the freezer in question before anyone could answer your question.
Since most home chest-type freezers operate on 115 VAC, that would mean that if your 1,000 AMP generator produced 115 volts, it would need to have a capacity of 11,500 watts. That's a pretty big home generator.
You'll need to research the start-up requirements of your freezer and both the peak and continuous load capacity of the generator.
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If your generator is rated at 1000 watts continuous......and you are using 120V.....available amps are 1000/120 =8.3 .
The question isn't the number of amps total on your branch circuits, but rather, what your MAIN breaker(s) are rated at. This will determine what size of generator you will need. And be certain that the generator is 3-phase. <<>> The formula you are looking for is Amps = kva x 1000/1.73 x voltage.
That depends on the power requirement of the sump pump. A 1000 watt generator (if this is running watts) will produce 1000 watts continuous. Through some simple math, this is equivalent to 8.33 amps at 120 volts. Current (in Amps)=Power (in Watts)divided by Voltage (in Volts). On your sump pump, there is something called a nameplate which lists model number, serial number, manufacturer, and power requirements. The power can either be listed in watts directly, or in amps (at 120v). If it lists watts directly, this number is either higher or lower than your 1000w generator. If it lists amps, your generator will supply 8.33 amps continuous, as figured above. Likewise, you can find out if your generator can power any given load by using this method. Just divide the listed wattage by 120 to get amps. Also, motors do pull higher current when they start, so it is usually recommended to size the generator larger than you would otherwise when you are running a motor, such as your pump. If the sump pump is right up there at 8 amps, it would be pushing the limit to expect it to run the pump. Some smaller generators too are so-called "inverter" units, and many of these are not recommended for motor starting duty. Check the generator's manual to be sure.
To answer this question the voltage of the generator must be given.
First you need to specify what voltage you require the generator to supply...Lets Assume its 240 Volts AC. Watts=Volts x Amps so 240x1200= 28.8 Kw. Then you have to take the efficiency of the generator into account. Mechanical power in is usually quite a bit more than the electrical power you get out...The difference is mostly the mechanical and thermal losses added together. If we say the generator is 70% efficient then you will need a generator 30% more powerful to supply a constant 1200 Amps...Thats a generator of about 38-40 Kw.