Question about Kw.h & Amp

[madcow809]

Hi,

Please can someone advise me on converting from Kw.H to amps, and vice-versa.

I'm in the glass industry, and I've got a massive power problem that I have to rectify before I can move into a new factory. The overseas supplier says that I need a minimum of 450Kw.H of power output, but the local electricians is requesting the information in amps.

So, in order for me to get started with the production plant, I will need to make sure that everything is power compliant first, before moving to the next step.

Relevant info: Local South African's power supply is 220/230V.



Thanks in advance.

 

[EngStudent]

Edit: Ignore me. Misread the question then spouted the internet equivalent of verbal diarrhea.

 

[dingbat]

Hi,

Please can someone advise me on converting from Kw.H to amps, and vice-versa.

You can't

kWh is a measure of energy consumption over time, whereas Amps is a measure of current flow at any given point in time.

For instance, 50 kWh could be consumed by a 20 A load at 230 V running for about eleven hours or a 220 A load for just one hour. (all numbers rounded for clarity)

What you need from your supplier is a load rating in kW or kVA or just plain amperes.

(A 450 kW load, however, over three phases, will require a supply of 650 A per phase before you account for any power factors, if applicable)

 

[RedHerring2]

... and I've got a massive power problem that I have to rectify ......

And then he wants to convert it to DC

 

[madcow809]

Thanks for all the help guys. Much appreciated.

My overseas supplier has just e-mailed me with the info of 900A, does that sound about right for an industrial sized furnace?

 

[Stoday]

You must talk to your electricity supplier, Eskom for most of S Africa. They may well want to make the supply to you at high voltage, 11kV or perhaps 6.6kV. If so, you will have to supply a transformer to convert it to the low voltage needed by your glass furnace.

Is your glass furnace the type with electricity passing through the molten glass? Or is is a reverbatory furnace such as a lehr? Just knowing that the power demand is 450kW (presumably you mean this, not 450kWh) isn't enough. Nor is 900A. At what voltage? The manufacturer will specify what voltage, power and the number of phases needed.

Eskom will want to know the duty factor their supply is to make and the maximum demand of the factory. Their connection charges will be based on this information. You have to talk to Eskom to find out what info they want and when they can make a supply of 450kW available. You may have to wait months.

 

[madcow809]

You must talk to your electricity supplier, Eskom for most of S Africa. They may well want to make the supply to you at high voltage, 11kV or perhaps 6.6kV. If so, you will have to supply a transformer to convert it to the low voltage needed by your glass furnace.

Is your glass furnace the type with electricity passing through the molten glass? Or is is a reverbatory furnace such as a lehr? Just knowing that the power demand is 450kW (presumably you mean this, not 450kWh) isn't enough. Nor is 900A. At what voltage? The manufacturer will specify what voltage, power and the number of phases needed.

Eskom will want to know the duty factor their supply is to make and the maximum demand of the factory. Their connection charges will be based on this information. You have to talk to Eskom to find out what info they want and when they can make a supply of 450kW available. You may have to wait months.

A massive thank you for the in-depth reply. I've forwarded all the questions to my overseas supplier via e-mail, now I just need a reply from them.

The type of furnace that I will be using is a glass toughening furnace. The furnace simply heats up the glass. The repeated process will fabricate the glass into safety glass, or also known as toughened glass, tempered glass, or simply as armour plated glass.

Sorry if my thread is causing some confusion. I will keep you guys updated once I get more information from the manufacturer/supplier.