It calculates the maximum demand in KW and to find maximum demand in KVA, divide it by average power factor.
How to convert electric bill kWH to kVA?
- Thread starter BackInBlack
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You see, the problem is, you are still using the concept I highlighted.
And let me reiterate the question:
The only demand through usage data the NEC permits in its load calculation is:
kwired
Electron manager
- Location
- NE Nebraska
Guess that is what was asked as is worded, but have to question if that is what was intended to be asked. Like I said, if there is a demand charge then actual demand data will be on the bill, my guess is OP wanted to know what peak demand was for other purposes such as determining minimum size of supply conductors/overcurrent protection needed to handle current loads.
Suppose the period is 30 days and you have total energy (kWh) consumed in that period. It could all have been consumed in one day or at a constant 24 hour rate every one of the 30 days of the period. We are not given that information in the original post. Nor any information about PF for that matter.
So how could you possibly calculate kVA which was the question asked?
ggunn
PE (Electrical), NABCEP certified
- Location
- Austin, TX, USA
- Occupation
- Consulting Electrical Engineer - Photovoltaic Systems
Once again, you can calculate a theoretical demand, not the real demand that the utility will use to determine demand charges. I don't know how to say this any clearer. Any calculation you do with only the kWh consumed in a month cannot determine the demand during the 15 minute period of maximum load during that month. You may be able to determine what it COULD be, not what it IS. It might be useful information but it is irrelevant to the OP's question.
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- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
But you have to admit that if you' can categorize the occupancy type and access the statistical load factor (not power factor) for that type of occupancy you will get a better first guess than by just assuming uniform power usage?
Whether that guess is useful to the OP depends on why he needs the information.
Whether that guess is useful to the OP depends on why he needs the information.
I hope the OP may be interested to furnish the details you require.
For me, it is not a requirement.
I comment on what is posted.
Well, I have already commented on it:
So it is not under the purview of NEC.
So I asked this question
to make a code proposal after discussion to include load factor for calculation of maximum demand in cases such as OP's under the purview of the code.
And highlighted is what I keep trying to tell you. There is no calculating maximum demand. It is a measurement... period.
The OP ask the same question countless others do in trying to comply with that section... and the same answer applies to all... IT IS NOT POSSIBLE...!!!
Feel free to propose a change to the 2020 NEC through a Public Input, and I wish you good luck with acceptance... but your idea will not gain any support here until that happens.
For an analogue meter, measuring a quantity may apply. But for a digital meter, calculating rather than measuring a quantity applies.
Here not support just debate for the benefit the OP.
- Location
- Massachusetts
Here not support just debate for the benefit the OP.
You have not helped the OP or anyone here in the least. :happyno:
The OP did return and did understand, no thanks to you, that he could not get the answer he needed from the kWH.
Because you should.
That's what nice people do.
Even to mean people?
kwired
Electron manager
- Location
- NE Nebraska
Especially mean people.
Be kind to others and they are more likely to be kind to you. Doesn't seem to be a concept that is taught as much anymore these days.
- Location
- Massachusetts
Not one person has been mean to you in this thread.
Considering the OP got his answer many posts ago I am closing this train wreck of a thread.
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