Official AC Thread for Buying Air Conditioners

[Benighted]

anyone fully knowledgeable about inverter acs here? as far as i know it can be run off of a ups very easily as it does not consume those house shaking watts when the compressor starts and rather slowly rises its wattage till the cooling potential. At least that was true for a toshiba inverter i read about in its brochure. If only that fact is true then i will never buy a normal a.c again.

The inverter technology in a sense means what you are describing. It will be true for any inverter AC, irrespective of the make. Inverter ACs automatically adjust their power consumption. The nearer they reach the desired temperature, the less power they consume. I don't know much, so I am not sure if it can be run off of a UPS, because during starting it still requires a good amount of power. But yeah, in principle, their energy-efficiency is much better than normal ACs

 

[HAMMER of THOR]

The inverter technology in a sense means what you are describing. It will be true for any inverter AC, irrespective of the make. Inverter ACs automatically adjust their power consumption. The nearer they reach the desired temperature, the less power they consume. I don't know much, so I am not sure if it can be run off of a UPS, because during starting it still requires a good amount of power. But yeah, in principle, their energy-efficiency is much better than normal ACs

i am specific about this particular thing... that they start off slowly, not at max... their compressor spools up slowly till it builds up to the 1700-1800 watts for the 1.5 ton ac and then do that off and on again... that is why a ups that can handle that much power can run it... normal a.c would start of 3000w or even more then go to its normal wattage... something like that. I read it about a toshiba inverter which of quite expensive, i might add...

 

[Benighted]

You are probably correct.

 

[haroonshaikh]

A simple differentiation between normal and inverter AC is that a normal one runs on AC (Alternating current) that runs in our home and office electrical sockets. However, an inverter one works on DC (Direct current) . It takes the current from the AC socket and converts it to DC (This AC to DC converter is called the inverter)before the conditioner uses it.

1. How does inverter AC saves electricity?
The compressor of the inverter AC varies its speed as per requirement. in a normal AC the compressor is either ON or OFF. However, in inverter AC the compressor varies its speed, Once the preset temps are met the compressor slows it speed and slows the cooling process and hence saves electricity

2. Why cant a normal AC compressor motor speed be varied like the DC one?
Yes, it can be done. Industrial AC motors have a controller thing called (VFD, variable frequency drive) its very expensive device and is quite big and is used to control the speed of AC motors. Now due to size and cost it becomes purely unfeasible for a home AC unit to have this function

3. SO why does inverter AC varies speed so easily if doing it in AC so hard and expensive?
DC equipments operates on lower voltages and ironically its much easier to control their speeds with simpler and cost effective controllers

4. Why the hell does inverter AC starts on generator easily and it takes a larger generator to startup a normal AC
All AC powered motors takes up a large amount of current when they are initially started (This is called surge current) and its normally 3 times the normal current the AC consumes in normal operation. In industrial applications where the motors are extremely large and hence its much difficult to handle the surge current so what do they do?? they install a device thats called soft starter. This soft starter as it names starts the motor slowly and then gradually brings it to the nominal speed. AGAIN these are so expensive that its never installed in household applications.
Now since the motor/compressor of inverter AC works on DC the surge current almost dies away... Its still there but its soo minor that it can be ignored as well.

5. Ohh my, since DC motors are soo efficient and requires low currents etc. why are not all motors powered by DC?
Its not that simple, As the size and torque requirements goes up, manufacturing cost of DC motors goes up as well and there are many other factors that are taken in consideration. Not so important to be mentioned here

6. How much will an inverter AC save me in bills as compared to a normal one.
Its a tricky question. It depends on how long do you use your AC. the longer its operated, the more savings will be evident.

7. Whats next with inverter technology?
Well since AC's are already coming in this technology, the next would be refrigerators and deep freezers as they all use almost the same cycle

8. Hmmm, interesting gets me to wonder what all stuf works on AC and what all on DC?
A simple classification would be that. ALL electronics works on DC (tv, LCD, phones, computers, etc) Note; The power supply in your computer converts the AC into DC so that all your parts get the DC voltage.
All electrical stuff works on AC. (washing machine, water pumps, suction pumps, etc)

Hope it helps ,
Anymore questions? feel free to ask
Anything i mentioned wrong? feel free to correct it as well

 

[hasanevanof]

which air conditioner consumes less electricity?

 

[Nomiforu]

which air conditioner consumes less electricity?

https://www.daraz.pk/close-comfort-...r-320-watts-white-brand-warranty-5544125.html

 

[fayaz88]

I am using Dawlence 1.5 Tons inverter AC. The cooling is superb! And the room gets very quickly cooled. The outer is so silent that you CANNOT hear it whatsoever. The guys who installed the outer said that for a 1.5 ton AC, the amperes written on AC are less. The AC says 6.5 amperes and they said usually, 1.5 ton ACs are 7.5 to 8 amperes. The temperatures outside are very high 47+ degrees celsius, and yet the cooling is very good! Dawlence has the cheapest inverter ACs in the market right now.

I don't know how much exactly the bill will come (because it hasn't come yet). But I am very impressed with the AC.

 

[prohyper]

After much consideration got a Kenwood 1204s 12000btu

images:
https://drive.google.com/file/d/0B_iLz7p_ADBAYzNNQlJUTWpjVDA/view
https://drive.google.com/file/d/0B_iLz7p_ADBAYW4yZmhfeEpjemc/view
https://drive.google.com/file/d/0B_iLz7p_ADBAVmU4Vy1WR3JXZk0/view

 

[The Alchemist]

I am using Dawlence 1.5 Tons inverter AC. The cooling is superb! And the room gets very quickly cooled. The outer is so silent that you CANNOT hear it whatsoever. The guys who installed the outer said that for a 1.5 ton AC, the amperes written on AC are less. The AC says 6.5 amperes and they said usually, 1.5 ton ACs are 7.5 to 8 amperes. The temperatures outside are very high 47+ degrees celsius, and yet the cooling is very good! Dawlence has the cheapest inverter ACs in the market right now.

I don't know how much exactly the bill will come (because it hasn't come yet). But I am very impressed with the AC.

keep us updated in case of decreased bill.

 

[fayaz88]

My analysis of Dawlence 1.5 Tons Inspire Plus Inverter AC:

After using this AC for more than a month, I can honestly say that Inverter technology is bullshit! Big time bullshit!

Why do I say this? (Note: This test was done at 30 degrees AC temp for cooling, and FAN medium settings.)
My AC is rated 7.5 Amperes. I have checked the amperage on my AC. In my experience the current is usually somewhere between 6.5 and 6.7. It does start with low amps and increase to 6.9 amps. But after that, in rare cases does it go less than 6.4. It is usually 6.5 to 6.7 amps.

Now, the ads my claim whatever bullshit they may. Here's the bitter truth:
If you run this AC for an hour, with an average current of 6.5 amps (trust me, the average is higher. I am just keeping it on safe side):
The number of units consumed for 1 hour of AC= 1.43 units.
Assuming you are in the first slab of electricity units, this means : 1.43 X 15 rs/unit = 21.45

The average consumption of this 'inverter' AC is 21 to 22 rupees per hour! Suppose you run your AC for 5 hours a day. That's about 3200 rupees/month.

I was the unfortunate victim of the 'inverter' savings scam and I over-used my AC.. This ended in a big bill ! I bought a clampmeter just to be sure how much juice was this AC sucking. And it turned out quite a bit.

In my opinion, if you run a 1.5 tons inverter and a 1.5 tons non-inverter AC for like 1 hour, the difference in electricity consumption will be negligible. If you run them for longer hours, you will see 'slight' savings on the inverter AC, but remember that because you are running AC for longer hours, your bill at the end of the month will be huge!!! (Although if you did run non-inverter for that many hours, the bill will be slightly more) The savings from inverter AC are very small and the ads are making you fool into thinking you can run for hours and save a huge amount of money!

@ The Alchemist
Here you go bro! Hope you find this helpful!

 

[haroonshaikh]

Now this is a detailed quantitative study.
Thanks for sharing the experience, atlast the 60% energy saving claim is now proved wrong...

 

[GloriousChicken]

My analysis of Dawlence 1.5 Tons Inspire Plus Inverter AC:

After using this AC for more than a month, I can honestly say that Inverter technology is bullshit! Big time bullshit!

Why do I say this? (Note: This test was done at 30 degrees AC temp for cooling, and FAN medium settings.)
My AC is rated 7.5 Amperes. I have checked the amperage on my AC. In my experience the current is usually somewhere between 6.5 and 6.7. It does start with low amps and increase to 6.9 amps. But after that, in rare cases does it go less than 6.4. It is usually 6.5 to 6.7 amps.

Now, the ads my claim whatever bullshit they may. Here's the bitter truth:
If you run this AC for an hour, with an average current of 6.5 amps (trust me, the average is higher. I am just keeping it on safe side):
The number of units consumed for 1 hour of AC= 1.43 units.
Assuming you are in the first slab of electricity units, this means : 1.43 X 15 rs/unit = 21.45

The average consumption of this 'inverter' AC is 21 to 22 rupees per hour! Suppose you run your AC for 5 hours a day. That's about 3200 rupees/month.

I was the unfortunate victim of the 'inverter' savings scam and I over-used my AC.. This ended in a big bill ! I bought a clampmeter just to be sure how much juice was this AC sucking. And it turned out quite a bit.

In my opinion, if you run a 1.5 tons inverter and a 1.5 tons non-inverter AC for like 1 hour, the difference in electricity consumption will be negligible. If you run them for longer hours, you will see 'slight' savings on the inverter AC, but remember that because you are running AC for longer hours, your bill at the end of the month will be huge!!! (Although if you did run non-inverter for that many hours, the bill will be slightly more) The savings from inverter AC are very small and the ads are making you fool into thinking you can run for hours and save a huge amount of money!

@ The Alchemist
Here you go bro! Hope you find this helpful!

Well then, Time to find whatever is pocket efficient in the market then.
This Inverter scam has been proven.

 

[mafiadog]

My analysis of Dawlence 1.5 Tons Inspire Plus Inverter AC:

After using this AC for more than a month, I can honestly say that Inverter technology is bullshit! Big time bullshit!

Why do I say this? (Note: This test was done at 30 degrees AC temp for cooling, and FAN medium settings.)
My AC is rated 7.5 Amperes. I have checked the amperage on my AC. In my experience the current is usually somewhere between 6.5 and 6.7. It does start with low amps and increase to 6.9 amps. But after that, in rare cases does it go less than 6.4. It is usually 6.5 to 6.7 amps.

Now, the ads my claim whatever bullshit they may. Here's the bitter truth:
If you run this AC for an hour, with an average current of 6.5 amps (trust me, the average is higher. I am just keeping it on safe side):
The number of units consumed for 1 hour of AC= 1.43 units.
Assuming you are in the first slab of electricity units, this means : 1.43 X 15 rs/unit = 21.45

The average consumption of this 'inverter' AC is 21 to 22 rupees per hour! Suppose you run your AC for 5 hours a day. That's about 3200 rupees/month.

I was the unfortunate victim of the 'inverter' savings scam and I over-used my AC.. This ended in a big bill ! I bought a clampmeter just to be sure how much juice was this AC sucking. And it turned out quite a bit.

In my opinion, if you run a 1.5 tons inverter and a 1.5 tons non-inverter AC for like 1 hour, the difference in electricity consumption will be negligible. If you run them for longer hours, you will see 'slight' savings on the inverter AC, but remember that because you are running AC for longer hours, your bill at the end of the month will be huge!!! (Although if you did run non-inverter for that many hours, the bill will be slightly more) The savings from inverter AC are very small and the ads are making you fool into thinking you can run for hours and save a huge amount of money!

@ The Alchemist
Here you go bro! Hope you find this helpful!

The gree inverter made for U.A.E (rare in the market) runs at on average of 3 amp tested via clamp during the sunniest days in Karachi at noon on a set temperature of 27c with full fan. I can safely assume it will consume about 5 amp in normal settings at lower temps.

That's why you see inverters ranging from 50k to 100k. I've done a fair amount of research and can comfortably conclude that although there are indeed some good inverter acs out there which can save you some money at the end I will agree with your post that inverters are turned on for a longer duration that non. Also adding that previous generation although costed for repairs but still they lasted 20 years easily , the new inverters if fail will needlessly cost way more then in repairs and also in cities like Karachi will miserably fail.

My advice is to get a good brand normal air conditioner and make peace with it. That brilliant air condensing machine will never save you on the bills so better get the best which cools fast than one which cools slow as duration of operation will be same and bills at the end ...same.

Sent from my Alpha

 

[Mian Sahab]

since the market is flooded with many inverter companies now. it have become harder to choose the right now. As considering price, along with quality is must but the most thing is which will last longer and how much we will actually save compare to our conventional AC. sure they say this much cash, but the real comparison is how much units is saved on the same amount of time used, or how much more hours used to get the same units as before.
sure we have local assembly brand from Gree, Orient, kenwood. then we have china build Green Air (same company as Ascon) , midea a/c (same orient company), then we have import from Taiwan, Malaysia , Lg, Hitachi, Sharp.

listening and watching Ad on tv is all crap as few shop owner said so too. about 80watts. that means i should throw all my fans and install ac since it will use 80 watts only.

this must i know that they will be saving around 30-50%. i know i need to run it longer to save money.

question to all this, i am looking for 1.5 ton split inverter AC, going to remove my regular AC in place of it;
normally my room is good enough for me to sleep once i run AC for 2 hours before i sleep, then fan does the rest.

how much running in hours to get same units compare to convential AC?
how much running needed to start saving?
If i run for 3 hours will the saving be implied or i need to run for 5-8 hours to see the saving.
Which brand is cause of cost, running, saving, n lasting.
do we need stabilizer for it and if yes how much watts.
how many 1.5 ton inverter can run on 6kv gas gen. (right now i run one only)

if you have experience with any brand of inverter AC, please can you inform me how much u can expect saving in units against regular AC u earlier had. how your experience with it and is it really worth for 2-3 hours running only, and will i see some saving or 40-50% saving compare to my regular AC

We have installed Orient inverter AC's last year. The older split AC I had was of a Chinese company LT. Lasted about 8 years till it died. Used about 9 A. Now I have been using Orient AC I had it checked and it was consuming about 4 A at the start and there is a difference in the bill as well. There is an Eco mode on which it consumes even less electricity. My room is on the second story and the sunlight shines directly from 8 am till dusk. So you can imagine how hot my room can be. I'm pretty happy with it. We have installed 4 inverter ACs. All Orient. My AC remains on most of the day. I haven't checked the bill in months but I do remember that it is a lot less than it used to be (Last summer). I can check again when the bill for May comes.
As for the generator, we got a 12 kVa and can run about 4 normal ACs at the same time with everything else like fridge, freezer etc. But we don't use more than 2 ACs on it normally. Running a generator can be costly so we avoid using it until necessary. Personally I'd recommend running only 1 inverter AC on your 6 kVa generator. But it may run 2 if you don't run anything else on it. But I'd recommend you ask the person who you bought the generator from just to be on the safe side.

 

[Mian Sahab]

My analysis of Dawlence 1.5 Tons Inspire Plus Inverter AC:

After using this AC for more than a month, I can honestly say that Inverter technology is bullshit! Big time bullshit!

Why do I say this? (Note: This test was done at 30 degrees AC temp for cooling, and FAN medium settings.)
My AC is rated 7.5 Amperes. I have checked the amperage on my AC. In my experience the current is usually somewhere between 6.5 and 6.7. It does start with low amps and increase to 6.9 amps. But after that, in rare cases does it go less than 6.4. It is usually 6.5 to 6.7 amps.

Now, the ads my claim whatever bullshit they may. Here's the bitter truth:
If you run this AC for an hour, with an average current of 6.5 amps (trust me, the average is higher. I am just keeping it on safe side):
The number of units consumed for 1 hour of AC= 1.43 units.
Assuming you are in the first slab of electricity units, this means : 1.43 X 15 rs/unit = 21.45

The average consumption of this 'inverter' AC is 21 to 22 rupees per hour! Suppose you run your AC for 5 hours a day. That's about 3200 rupees/month.

I was the unfortunate victim of the 'inverter' savings scam and I over-used my AC.. This ended in a big bill ! I bought a clampmeter just to be sure how much juice was this AC sucking. And it turned out quite a bit.

In my opinion, if you run a 1.5 tons inverter and a 1.5 tons non-inverter AC for like 1 hour, the difference in electricity consumption will be negligible. If you run them for longer hours, you will see 'slight' savings on the inverter AC, but remember that because you are running AC for longer hours, your bill at the end of the month will be huge!!! (Although if you did run non-inverter for that many hours, the bill will be slightly more) The savings from inverter AC are very small and the ads are making you fool into thinking you can run for hours and save a huge amount of money!

@ The Alchemist
Here you go bro! Hope you find this helpful!

I have a Orient inverter AC. Last time I had it checked, it was consuming about 4 A. The bill was also lesser than it used to be. Maybe Pel doesn't make good ACs or something like that? :/

 

[mafiadog]

Orient also has a beautiful design for inverter with carbon fiber front.

Sent from my Alpha

 

[fayaz88]

I have a Orient inverter AC. Last time I had it checked, it was consuming about 4 A. The bill was also lesser than it used to be. Maybe Pel doesn't make good ACs or something like that? :/

Was it 1.5 Tons Inverter AC?

 

[haroonshaikh]

There are other factors as well in inverter AC's

Normally there are 3 motors in Airconditioners
1. Compressor
2. Inner fan motor
3. Outer fan motor

Some of the vendors have installed DC motor only on the compressor and claim it as an inverter AC. which is correct. However, some vendors have converted all 3 motors to DC and name it as pure inverter AC or something

 

[smaaz]

so dc motors consume less current/amperes as compared to ac ?

 

[haroonshaikh]

so dc motors consume less current/amperes as compared to ac ?

yes, the consume little less current than AC. The major benefit is not lower current but its
1. DC motors speed can be varied easily
2. Starting surge current is almost none as compared to ac ones