Cost per KW per hour on 15 amp service

[notrub]

Have looked for a post about this but don't see one.  My electric bill came to 2,800 THB last month and I don't know what I am paying for and how to economise.  I have a sauna heater which is 6 KW and my AC is a Samsung 1830 W digital inverter type.  So, can you help me to understand how much does my sauna heater cost per hour to run?, please.  Also for per hour for AC too.  With the AC does it matter what the temperature is?  With the sauna heater it is just on drawing 6 KW until switched off.  While you are at it, how much is a 20 w led light per hour please?  Grateful for information about this to lower or raise my guilt feeling while sweating away in the sauna heat.  Also ideas about how to economise with the AC.  Don't use it much but does it cost more to stop and start it than to leave it on low 24/7 in the bedroom only?  Thanks very much for any answers.

[carlyai]

Someone smarter than me will do the maths, but you need to give a realistic number of hours you use these things. Unfortunately, when you get an air con and sauna you tend to use it for more hours than you think.
But the price sounds reasonable to me as I would use the Sauna about 2 hours per day and the aircon from 7 pm to 4am and also in the day sometime. But that's only me.

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[Crossy]

Cost per unit varies with usage, but a rough guide is about 4.1 Baht per unit including VAT and fuel tariff.

 

Your sauna will use 6 units per hour when heating up, then the thermostat will cut that, but it depends how hot you run it and for how long, so assume 24 Baht per hour.

 

The aircon, assuming it's a baby 6,500 BTU (1830W) unit will run at about 0.6 units (2.5 Baht) per hour when running flat out. Your set temperature will make a lot of difference to how much it uses. Can you verify the actual model number of the aircon please so we can be certain.

 

Run the aircon only when in the bedroom and set the temperature as high as possible and still remain comfortable, ours is set to 28C and we run a stand fan on low all night as well. Turn it down to 24C if rumpy-pumpy is on the cards

 

Your 20W LED will cost a massive 0.082 Baht per hour to run.

 

So.

Sauna 2 hours per day = 48 Baht

Air 8 hours over night = 20 Baht

 

So that's about 2,000 Baht per month.

 

[carlyai]

'Turn it down to 24C if rumpy-pumpy is on the cards'

Is 'rumpy-bumpy' a UK electrical technical term?

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[colinneil]

Crossy can you explain rumpy-pumpy.

[Crossy]

On second thoughts, that probably does count as "too much information"

 

[notrub]

Great news about sauna cost at 24 baht per hour.  Every other day on for 2 hours is what I use so less than a coffee at Amazon.  My AC is Samsung AR 5000 - AR18KRFSQURNST and shows a draw of 1830 and 19,615 BTU/hr (I think).  We have it set at about 28 quiet cooling normally only during the night.  We are still on temporary, construction power and I am told that is more costly.  Due to change soon to 15 amp permanent.   The inspector came and looked when we ordered the permanent meter and he said they don't worry about farang construction too much as we are 'picky' about safety.  (Said in the nicest, complementary way.)    Thank you very much for the cost info.  The cost for an LED light is good too and will produce your info the next time I get an earful for not turning off the lights.

 

BTW it was me who asked about the YLT panel a few months ago.  I did not take your advice and so bought 2 no  8 breaker units complete with RCBO and surge protection.  They seem to work and have tripped reliably during 'fooling around with electrics' moments.  The price was around 1600 baht each and couldn't resist.

 

Thanks again for your help

[Crossy]

OK, then the sums for the A/C are about right so long as it's not being run flat out

 

Temp power is about double the price of permanent so expect your bill to fall significantly.

 

[harrry]

2 hours ago, Crossy said:

On second thoughts, that probably does count as "too much information"

 

So  you cool things down to heat things up.

[Crossy]

1 minute ago, harrry said:

So  you cool things down to heat things up.

 

It does have the (dis)advantage of causing herself to roll up in the duvet. Adds to the pleasure of unwrapping the goods

[harrry]

I have never been able to unsterstand how at 28 degree Centigrade a Thai can wrap themself up like an eskimo at 25  degrees farenheit.

[kamalabob2]

Crossy is correct that the PEA rate, including the modest charge for a meter, and all taxes is 4.1 or 4.2 per kilowatt.  I scanned the May 2017 bill from the PEA for 3 phase, 30/100 meter service to my home which has a swimming pool pump, jacuzzi spa pump, booster water pump,  WASP Security electric fence, eight a/c units, two kitchens, one electric oven and all manner of electrical appliances. Most of the lighting is LED..  739 KW for the month  100 baht a day for electricity. Three of the eight a/c units are inverter air conditioners. 

[Gary A]

A friend of mine had a sauna. It was heated with a small homemade barrel stove. Around his house, he had a lot of trees. There were always plenty of dead branches on the ground. He had the benefit of cleaning his yard and free heat. He knew exactly how many branches to put in the stove to get the sauna to the temperature he wanted.

 

ADDED - I forgot, he had a metal tub on top of the stove filled with rocks. They got hot enough to make steam when water was poured over them.

[harrry]

3 minutes ago, Gary A said:

A friend of mine had a sauna. It was heated with a small homemade barrel stove. Around his house, he had a lot of trees. There were always plenty of dead branches on the ground. He had the benefit of cleaning his yard and free heat. He knew exactly how many branches to put in the stove to get the sauna to the temperature he wanted.

atmosphere polluter   :)

[harrry]

My last bill on a single phase worked out at 4.2 baht unit total

[wayned]

Mine also was around 4.2/kwh.  Expect your next bill to be higher as the fuel surcharge (FT) is supposed to increase by 50 satang.  It's been a negative for a while, - 0.3729.

[notrub]

Thanks for the information.  I just changed to regular service after temporary for construction.  Next moth will be first at a new, lower (I hope) rate.