Amps from Utility Kwh

[AZsparky]

I have a client who has a 200 amp service and I would like to find out how much he's using of that panel during his maximum peak month of electrical usage. I was told by the EU using his meter number that his max Kwh was reached last September and was 4,200 Kwh. Can I determine an average daily maximum amp load from that figure. If so, what is the calculation? Thanks.

 

[celtic]

I was told by the EU using his meter number that his max Kwh was reached last September and was 4,200 Kwh. Can I determine an average daily maximum amp load from that figure. If so, what is the calculation? Thanks.

Nope...the best you can is calculate an estimated average daily max by dividing by the number of days.

If you want to know an actual average daily max, you would need daily monitoring.

 

[rattus]

Maybe:

Maybe:

I have a client who has a 200 amp service and I would like to find out how much he's using of that panel during his maximum peak month of electrical usage. I was told by the EU using his meter number that his max Kwh was reached last September and was 4,200 Kwh. Can I determine an average daily maximum amp load from that figure. If so, what is the calculation? Thanks.

If this service utilizes a demand meter, then the peak real power can be determined on a daily basis. From this and the PF you can determine the peak current.

 

[AZsparky]

Calculation for average daily amps single phase

Calculation for average daily amps single phase

If I am told the Killowatt hours used in the peak month is 4200, could an ESTIMATE be derived for how close he is coming to maxing out that service without doing load calcs. I KNOW this residence (4,000+ s.f.) should have 400 amps serving it, but I am just curious if a determination of ABOUT how much load this 200 amp panel is actually under during peak month consumption.

Thanks...

 

[Smart $]

If I am told the Killowatt hours used in the peak month is 4200, could an ESTIMATE be derived for how close he is coming to maxing out that service without doing load calcs. I KNOW this residence (4,000+ s.f.) should have 400 amps serving it, but I am just curious if a determination of ABOUT how much load this 200 amp panel is actually under during peak month consumption.

Thanks...

Nope!

Services are designed for handling peak current. In simplistic form, if his 200A main does not trip (and all other factors are in compliance with code at the time of installation), he's good to go. The only thing that'll prove otherwise is doing the calcs and/or getting demand info as rattus mentioned.

 

[brian john]

A simple solution is go the house turn on a typical amount of load. Run hot water to force water heater on, adjust T-stat to run HVAC, turn the lights on and any other load. Measure current.

TA-DA job completed, no monitoring, no utility involvement OR hire me I'll come out and monitor it for you. How far to the nearest ski slopes?

 

[iwire]

A simple solution is go the house turn on a typical amount of load. Run hot water to force water heater on, adjust T-stat to run HVAC, turn the lights on and any other load. Measure current.

I don't see that as an NEC compliant option.

We have to either do a full load calc or comply with 220.87 or it's exception.

 

[stickelec]

I don't see that as an NEC compliant option.

We have to either do a full load calc or comply with 220.87 or it's exception.

You're making me wear out my code book. :grin:

 

[brian john]

He did not ask (I do not think) for compliance he wanted to know from a practical stand point, I THINK>

Just a gut feeling, but I bet most people that do service upgrades really would have sufficient ampacity with their existing service.

 

[iwire]

Just a gut feeling, but I bet most people that do service upgrades really would have sufficient ampacity with their existing service.

I agree, more often then not they are really just short on space for more breakers.

 

[brian john]

When I did residential service work I had to change out a 200 amp fused panel with spares, for a 200 amp circuit breaker panel, home inspector flagged the fused panel. I told the homeowner I'd meet with the home inspector, my boss was not happy when I told him that and the how owner just wanted to close on the sale.

 

[AZsparky]

Thanks

Thanks

Thanks much to all of you for your replies to my post. I know the calcs will show an upgrade sorely needed.

I have a fast track project I'm bidding involving a landscape renovation. I will provide the power for the renovation with the existing service but with a 400 amp future service in mind. The additional load at this time will be minimal.

 

[brian john]

How big is this house?

 

[AZsparky]

House Size

House Size

The county assesor has it listed at 3,400 s.f. The current home owner claims 4,250. I think there have been some non-permitted additions done before this owner.