Jump to content
BANGKOK
blackcab

How to measure the electrical cost of one device

Recommended Posts

I have been set the task of measuring the cost of electricity in baht that a single unit temporary air cooler uses overnight.

 

What's the easiest way to do this? I know I can buy a simple plug in energy monitor, but I can't seem to find one which accepts a Thai plug and plugs into a Thai wall socket. A picture of the type of thing I had in mind is below.

 

Any idea where I can get one of these devices that will work in Thailand, or is there another simple way of doing this? I don't mind buying reasonably priced kit.

 

Screenshot_20191007-232215_Chrome.thumb.jpg.d0a41c120df5a29cbed06075fd35eff1.jpg

Share this post


Link to post
Share on other sites

Just use adapters for the plugs; the US one will plug into the wall, and use a thai plug strip with “universal” sockets you should be fine, as long as the temporary one is a standard plug.

 

The other approach is to do it at the panel, but that is over complicating it.

  • Thanks 2

Share this post


Link to post
Share on other sites
7 hours ago, wayned said:

The easiest way is to calculate it.  Just look for the label on the unit, it will give you the watts consumed in one hour of operation.  Mine uses 75 watts which is 0.075 kWh.  Multiply that by the noumer of hours in use per day.  I use mine about 10 hours, so 0.)75 x 10 = 0.75.  My KWH charge with VAT averages 4.1 baht.  So 4.1 x 0.75 = 3.1 baht/day. ((wattage on unit x Number of hours use per day)/ 1000) x electric rate per kWh.

OMG!  An air cooler that only uses 75 Watts?  What is it, a small fan?

  • Like 1
  • Haha 1

Share this post


Link to post
Share on other sites
Posted (edited)

You can also install a sonoff you can buy from Lazada.  They allow for internet monitoring

Edited by OffshoreMig
typos

Share this post


Link to post
Share on other sites
On 10/8/2019 at 8:04 AM, Damrongsak said:

OMG!  An air cooler that only uses 75 Watts?  What is it, a small fan?

It's not an air conditioner, it's an evaporative air cooler.  Basically a three speed fan and a  aquarium pump.

  • Thanks 1

Share this post


Link to post
Share on other sites
Posted (edited)

It doesn't seem to be easy to find such a device with proper Thai style socket and plug (saw Schuko and "UK" style plugs).

For a low wattage device you could use adapters/extension cords.

Not hard to find and fairly cheap.

Edited by KhunBENQ

Share this post


Link to post
Share on other sites
Posted (edited)

You only chance will be to turn off everything else and sit by the meter for 24 hours. :crazy:

 

After all, this is Thailand. 😉

Edited by Matzzon
  • Haha 1

Share this post


Link to post
Share on other sites
On 10/8/2019 at 4:05 AM, wayned said:

The easiest way is to calculate it.  Just look for the label on the unit, it will give you the watts consumed in one hour of operation.  Mine uses 75 watts which is 0.075 kWh.  Multiply that by the noumer of hours in use per day.  I use mine about 10 hours, so 0.)75 x 10 = 0.75.  My KWH charge with VAT averages 4.1 baht.  So 4.1 x 0.75 = 3.1 baht/day. ((wattage on unit x Number of hours use per day)/ 1000) x electric rate per kWh.

that works ok for a static appliance like that. but with an airconditoner the rating is with the compressor running and the compressor does not necessarily run constantly but will switch on and of during operation as required

  • Like 1

Share this post


Link to post
Share on other sites
15 minutes ago, Swimfan said:

that works ok for a static appliance like that. but with an airconditoner the rating is with the compressor running and the compressor does not necessarily run constantly but will switch on and of during operation as required

So use 30-49% duty cycle.

  • Confused 1

Share this post


Link to post
Share on other sites
On 10/7/2019 at 11:23 PM, blackcab said:

Any idea where I can get one of these devices that will work in Thailand, or is there another simple way of doing this? I don't mind buying reasonably priced kit.

 

AliExpress https://www.aliexpress.com/item/32914620785.html has the US plug option and is 220V.

 

Looks awfully like the one pictured in the OP.

  • Like 1
  • Thanks 1

Share this post


Link to post
Share on other sites

I got one in UK which I put a sensor on the mains cables coming into the meter, and it shows the overall consumption. Then could just turn the appliance you want to measure and see how much it goes up. They are available on Amazon & EBAy.

  • Thanks 1

Share this post


Link to post
Share on other sites

Every homepro and ThaiWatsadu also sale the kWh meter you also have at your electricity pole.

Calculating by usage the type ID is possible. But only for things what are really full "ON" the time you check them. (I think only lights) Every cooking plate, coffee set machine, refrigerator, AC, are mostly not on 24/24, even when they are on. Also voltage difference in supply voltage makes the usage from kWh different. 

 

Measuring is the way to go. And there are many ways to do. I bought a few kWh meters from Lazada. Equipped them with wall outlets and a cable to plug in in a wall outlet, and it is very easy to measure. With all kind of different equipment, with all different settings.

 

And recently I stayed in an apartment in BKK. Everytime when I entered and left the appartment I toke a picture from my meter. I put the figures in a Excel sheet. It calculated the time between the pictures. My usage /hour/ and /minute. I only needed to record what I changed (in this case it was only setting from AC, as I did not ave any other users.)

 

After a while you get interesting figures....

 

One of the most interesting ones, it is much cheaper to leave your AC on when you leave just a short time. Decrease the temperature cause a rise in usage for about two to three hours, after that period of time there is not so much difference, but a difference.

 

Arjen

  • Like 1
  • Thanks 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...