generator sizing

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ninosparkz

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What is the requirement for sizing of the generator and ATS.... can the unit be undersized and still be automatic with load shedding.
 
I should mention that it is res. and the HO wants to have automatic transfer and manage load
Shedding .... 400 amp service ... 200 amp service rated ATS.... 2- 200 amp panels with a 20kw gen set that is way undersized ( HO already purchased system and want install ).. I guess my question is will tha AHJ allow the HO to manage the shedding manually ?
 
If you have 2 service cables coming out of the meter then you could do 1 panel only .... with a 200 amp transfer switch ...

next what is the load calulation for the house ??
 
ninosparkz said:
I should mention that it is res. and the HO wants to have automatic transfer and manage load
Shedding .... 400 amp service ... 200 amp service rated ATS.... 2- 200 amp panels with a 20kw gen set that is way undersized ( HO already purchased system and want install ).. I guess my question is will tha AHJ allow the HO to manage the shedding manually ?
Click to expand...


Not necessarily ......4000 sf house all gas appliances ....or with load shed .... need a true load calc.
 
ninosparkz said:
I should mention that it is res. and the HO wants to have automatic transfer and manage load
Shedding .... 400 amp service ... 200 amp service rated ATS.... 2- 200 amp panels with a 20kw gen set that is way undersized ( HO already purchased system and want install ).. I guess my question is will tha AHJ allow the HO to manage the shedding manually ?
Click to expand...

If it's an automatic transfer switch then the "load shedding must be automatic also.
The system can not depend on the owner switching/selecting loads if that's what you mean.
 
I've done this type of system and it's usually rather easy. As someone above mentioned, install the 200A ATS before one of the panels, then move circuits between the panels to suit your needs. Afterwards, do a load calc.

At this point you may be ok with the 20kw generator, depending on the results of the load calc. If not, then use a method of load shedding.
 
Strummed said:
I've done this type of system and it's usually rather easy. As someone above mentioned, install the 200A ATS before one of the panels, then move circuits between the panels to suit your needs. Afterwards, do a load calc.

At this point you may be ok with the 20kw generator, depending on the results of the load calc. If not, then use a method of load shedding.
Click to expand...

Thank you, that is my plan.
Appreciate it
 
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