tamsam6 Posted February 15, 2022 Share Posted February 15, 2022 I'd like to understand how much power a Cassette Style aircon uses when the room is at the desired temperature. Shouldn't the power draw drop significantly? https://www.daikin.co.th/wp-content/uploads/2018/03/FCF_catalog.pdf It says Power Consumption is 5,444 wats or 5.4kwat But on this page it seems to show that the requirement drops?https://www.daikin.com/corporate/why_daikin/benefits/inverter Any ideas how I can figure this out? Link to comment Share on other sites More sharing options...
sezze Posted February 15, 2022 Share Posted February 15, 2022 The 5.4kWatt is for the 48000 btu , so thats a big cooler . Beyond that , the power drawn will not always be 5.4 kW as long as it is a inverter type . The cooling capacity will be lower if the desired temp is reached . In your 48000 btu type , min cooling is 21000 btu and max is 50000 btu . The exact amount of energy used is not given in min amount but guessing according to the min btu of 21000 , it will be like 2000/2500 Watt . Some brands do give the min power drawn , like they give for the minimal cooling capacity . 1 Link to comment Share on other sites More sharing options...
Crossy Posted February 15, 2022 Share Posted February 15, 2022 Yeah ^^^, the actual minimum power consumption will depend upon your room situation but if the A/C is correctly sized for the space it should be less than 30% of the maximum power once the room is down to temperature. As @sezze notes, the unit you show has a minimum cooling capacity of 21,000 BTU so around 2kW of energy consumption. If your requirement is lower (cool day / oversized unit) it will simply shut off and behave more like a 21,000 BTU conventional A/C. Link to comment Share on other sites More sharing options...
tamsam6 Posted February 16, 2022 Author Share Posted February 16, 2022 Thanks for the info gents. I was hoping to hear much lower numbers. I'm currently sizing for a solar system and the battery storage I need at night is massive due to having some larger sized aircons in the house... If the bug 48k BTU takes 5kw and I have 15kwat of battery, pretty easy to see that the 3 hours of savings at 5 baht doesn't get me much considering the cost of the batteries. If it were to drop to 2 to 2.5kwatt, that changes it up a bit.. Link to comment Share on other sites More sharing options...
Crossy Posted February 16, 2022 Share Posted February 16, 2022 2 hours ago, tamsam6 said: If it were to drop to 2 to 2.5kwatt, that changes it up a bit.. If it's correctly sized then it should, or average even less if it's shutting down occasionally at night. The only way to really know is to get one of those clip on energy meters and monitor the beast over a few nights. 1 Link to comment Share on other sites More sharing options...
tamsam6 Posted February 16, 2022 Author Share Posted February 16, 2022 Thanks Crossy.. I think I may see what I can do to maybe put a divider in the room to lower the power draw from the beast. 1 Link to comment Share on other sites More sharing options...
Crossy Posted February 16, 2022 Share Posted February 16, 2022 15 minutes ago, tamsam6 said: Thanks Crossy.. I think I may see what I can do to maybe put a divider in the room to lower the power draw from the beast. Or get rid of those pet penguins ???????????????????????????? ???? How big is the room it serves? Do get some sort of energy monitor on the beast, you may be pleasantly surprised. 1 Link to comment Share on other sites More sharing options...
sometimewoodworker Posted February 16, 2022 Share Posted February 16, 2022 (edited) To give real world numbers my cassette AC that is either a 36,000 or 48,000 BTU unit (I don’t remember) the numbers under are whole house consumption NO AC background usage 3,096 W - 2.43A AC on full 9,359 W - 5.78A (AC only 6,263 W - 3.35A) Note; this number may ramp up higher given time. AC on almost standby 3,932 W - 2.66A (AC only 836 W - 0.23A) Edited February 16, 2022 by sometimewoodworker 1 Link to comment Share on other sites More sharing options...
sometimewoodworker Posted February 16, 2022 Share Posted February 16, 2022 The AC on full did ramp up to 10,630 W - 7.03A (AC only 7,534 W - 4.6A) Link to comment Share on other sites More sharing options...
tamsam6 Posted February 16, 2022 Author Share Posted February 16, 2022 7 hours ago, sometimewoodworker said: To give real world numbers my cassette AC that is either a 36,000 or 48,000 BTU unit (I don’t remember) the numbers under are whole house consumption NO AC background usage 3,096 W - 2.43A AC on full 9,359 W - 5.78A (AC only 6,263 W - 3.35A) Note; this number may ramp up higher given time. AC on almost standby 3,932 W - 2.66A (AC only 836 W - 0.23A) Thanks for this. I am guessing a 48000 BUT to draw 6300 W 1 Link to comment Share on other sites More sharing options...
sezze Posted February 16, 2022 Share Posted February 16, 2022 Must be a big room ... 48000btu is a massive aircon , and putting batteries for that requires a more then significant investment ( let alone inverters and large amount of solar panels ) . 2 Link to comment Share on other sites More sharing options...
sometimewoodworker Posted February 17, 2022 Share Posted February 17, 2022 @sezze Our room with the big AC is 58m2 (a little over 7 x 8 ) or for the main section 220m3 so the AC needs to be big. It is an inverter and though your minimum cooling consumption is probably accurate as you can see the cooling can turn off completely bringing the consumption down to about 10% of the maximum. 1 Link to comment Share on other sites More sharing options...
OneMoreFarang Posted February 17, 2022 Share Posted February 17, 2022 Maybe you are interested in something like this: https://shop.smarthome-europe.com/en/peripheriques/5132-sonoff-smart-din-rail-power-meter-main-unit.html Link to comment Share on other sites More sharing options...
tamsam6 Posted February 17, 2022 Author Share Posted February 17, 2022 10 hours ago, OneMoreFarang said: https://shop.smarthome-europe.com/en/peripheriques/5132-sonoff-smart-din-rail-power-meter-main-unit.html Will check that out. Thanks Link to comment Share on other sites More sharing options...
MrJ2U Posted February 17, 2022 Share Posted February 17, 2022 On 2/16/2022 at 10:02 AM, Crossy said: The only way to really know is to get one of those clip on energy meters Where can you get those and what do the "officially" call them? Air-conditioning is usually hard wired. Where would you attach the "metering device"? I'd like to get a few. Link to comment Share on other sites More sharing options...
mistral53 Posted February 17, 2022 Share Posted February 17, 2022 On 2/16/2022 at 12:32 PM, sometimewoodworker said: To give real world numbers my cassette AC that is either a 36,000 or 48,000 BTU unit (I don’t remember) the numbers under are whole house consumption NO AC background usage 3,096 W - 2.43A AC on full 9,359 W - 5.78A (AC only 6,263 W - 3.35A) Note; this number may ramp up higher given time. AC on almost standby 3,932 W - 2.66A (AC only 836 W - 0.23A) Check your calculation again - your wattage and current don't jibe case in point: 3096/230= 13.4 amps......... etc Link to comment Share on other sites More sharing options...
sometimewoodworker Posted February 17, 2022 Share Posted February 17, 2022 1 hour ago, mistral53 said: Check your calculation again - your wattage and current don't jibe case in point: 3096/230= 13.4 amps......... etc No calculations apart from subtracting the first set of numbers. Just reading the numbers from the meter. Also we never get 230V So just ignore the Wattage figures & I can get the voltages for you to have fun with your math, if you want ???? Link to comment Share on other sites More sharing options...
Crossy Posted February 17, 2022 Share Posted February 17, 2022 7 hours ago, MrJ2U said: Where can you get those and what do the "officially" call them? Air-conditioning is usually hard wired. Where would you attach the "metering device"? I'd like to get a few. Something like this (get the one with the clip-on CT if you don't want to pull and wires) would do the trick. https://www.lazada.co.th/products/100-original-diymore-ac-50-300v-0-100a-power-energy-meter-voltmeter-ammeter-kwh-digital-ac-electric-monitor-panel-meter-with-reset-function-i3125367961-s11626606839.html? Clip the CT (current transformer) over the live supply to the unit you want to monitor, for an A/C it would be easiest to do it where the wire exits the breaker. 1 Link to comment Share on other sites More sharing options...
MrJ2U Posted February 18, 2022 Share Posted February 18, 2022 2 hours ago, Crossy said: Something like this (get the one with the clip-on CT if you don't want to pull and wires) would do the trick. https://www.lazada.co.th/products/100-original-diymore-ac-50-300v-0-100a-power-energy-meter-voltmeter-ammeter-kwh-digital-ac-electric-monitor-panel-meter-with-reset-function-i3125367961-s11626606839.html? Clip the CT (current transformer) over the live supply to the unit you want to monitor, for an A/C it would be easiest to do it where the wire exits the breaker. Thanks. Enjoy your week. Looks like we'll need a heater. The high on Monday is supposed to be 15 Celsius on Monday in Upper Sakon Nakhon. Brrrrr. 1 Link to comment Share on other sites More sharing options...
Yellowtail Posted February 18, 2022 Share Posted February 18, 2022 5 hours ago, MrJ2U said: Looks like we'll need a heater. Two legged? 1 Link to comment Share on other sites More sharing options...
sometimewoodworker Posted February 18, 2022 Share Posted February 18, 2022 3 minutes ago, Yellowtail said: Two legged? 4 They are hotter than 2 Link to comment Share on other sites More sharing options...
Yellowtail Posted February 18, 2022 Share Posted February 18, 2022 Link to comment Share on other sites More sharing options...
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