Generator Sizing.

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This is just my opinion but if you size generators for the connected load you'll end up with a generator the size of your family car. Think about what you want to be able to run during a POCO outage. Normal use items such as a refrigerator, furnace, TV can be served with a relatively small generator (for arguments sake let's say a 10KW unit that will be protected with a 45A breaker). If your customer is one of those that wants to run her 3 ton AC unit during an outage, dry her clothes with an electric drier and bake using her double wall oven then you're up to probably a 20KW unit (that will be protected by a 100A breaker). After you do your survey have a talk with your customer and find out what they want to be able to run during an outage. You will also have to explain that they have to manage their own electrical loads. If they have a 10KW unit they probably will not be able to run all the lights and appliances at the same time.
 
If your area has "smart meters" the best method is to get the demand information from the meter. Most utilities that have smart meters let you access that information.
 
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