Whole House Generator...

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1793

1793

Senior Member
Location
Louisville, Kentucky
Occupation
Inspector
I have been asked to size a Standby Generator for a single family residence. There is a 200 amp service, gas stove/oven, water heater, furnace & dryer. A/C is the only 240v in the house. There are currently only three 20amp circuits and the rest are general lighting. Out of a 42 circuit panel only 30 circuits are being used.

How would you calculate the needed Standby Generator? Options so far are: 7.5KW, 15KW or 20KW.

Thanks
 
Norb, the best way to do this is let a manufacturer assist you. Variables such as Motors, AHU's, Pumps, Fuel type, Altitude, etc... play bigger parts in propperly sizing a Generator than the amount of circuits.

Contact a few different manufacturers with all the information you have and they will be happy to help you.

The 15 or 20kw would probably do the job though.

Roger
 
1793 said:
I have been asked to size a Standby Generator for a single family residence. There is a 200 amp service, gas stove/oven, water heater, furnace & dryer. A/C is the only 240v in the house. There are currently only three 20amp circuits and the rest are general lighting. Out of a 42 circuit panel only 30 circuits are being used.

How would you calculate the needed Standby Generator? Options so far are: 7.5KW, 15KW or 20KW.

Thanks
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This depends entierely on how much your customer wants to spend. Talk to them about what they feel is required for minimum convenience. Water, heat, and refrigeration are usually the minimun. In my experience a 7.5KW is adequate. After that it is just gravy for you.
 
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