There is NO free lunch, you will need many batteries and a much better alternator. Getting a good battery like this one on amazon is thus critical, Checking the actual consumption by RV refrigerator. Truly hassle free from in-house wall plug. A 12V compressor would be unnecessarily large, https://mechanics.stackexchange.com/questions/28741/can-a-car-ac-unit-be-run-on-just-the-car-battery/28787#28787. Peltier elements are really inefficient. You can buy 12v 120mm computer fans cheap that use very little power. Just easier when it's designed for it. (max 2 MiB). The Yeti would be able to run the BLACK+DECKER for about an hour. http://www.amazon.com/TEC1-12706-Thermoelectric-Peltier-Cooler-Volt/dp/B002UQQ3Q2. Either way you would need to transfer the resulting heat outside of the cabin. Each conversion has losses. The peltiers are less than 4mm in many cases so you will need something thin to keep them apart, depending on the total size of your device. In fact a central A/C unit for a house uses more electricity than anything else (in a hot climate). So, to remove the load of your AC from the engine, either direct or indirect, needs a separate power source - you could consider a bank of batteries that you charge at home and give sufficient power for your trip, but the weight will not improve the fuel consumption and you need to have the space available. I have read about the extra battery to power computer, etc. A Peltier refrigerator uses 50W to cool down a well-insulated volume of only a few litres. When put to hot, the air does heat. In a 12V system, that is 100 Amps. yes he did: "avoid wasting fuel". 3. I was just curious as today I was stopped on the highway for an hour. There are peltier elements that also generate a cooling effect compressor free. That test was done at full power and trying to cool a hot 86 degree F RV down to about 66 degrees F. In a normal car, there is no way to run the A/C without running the car. Currently, you take kinetic energy from the engine, and transfer it to kinetic energy at the compressor. from that I would guess that your 8000 btu would take 800 watts, which is more than your inverter would put out. I would sacrifice 50 to 75 pounds no problem for ice cold ac in Phoenix. Now I wonder if I had shut off the car (to save gas), how long would the battery last if I used the AC. It is possible to run your air conditioner for extended periods of time while you free camp - purely from your 12v Battery. If you don't have enough cooling you will break your peltier element. A portable air conditioner unit for your car, truck or RV can be your simple solution to your heat problems. Interestingly, my power bills tend to be significantly higher in the winter (when I'm running the electric heaters) than in the summer (when I'm running the AC). The design of this solar fan is to circulate the air rather than chill. Air-Conditioning can be considered as a “dirty” load due to continual switching causing voltage and current spikes and surges. I need to sleep in the back with the car on. What you shouldn’t expect is a fan blowing cold air. You would have to design and machine it yourself. Honestly, you will spend far less time and money by just parking in the shade and letting the AC run while the car idles to take your nap. In the case of Tesla EVs, for example, the AC compressor is located at the front of the car and draws power from the Energy Storage System, or ESS, in the back. Save cars. A lot will depend on the battery type, fill type (water, ice, or electronic air movement), and how it is used. https://mechanics.stackexchange.com/questions/28741/can-a-car-ac-unit-be-run-on-just-the-car-battery/32534#32534, https://mechanics.stackexchange.com/questions/28741/can-a-car-ac-unit-be-run-on-just-the-car-battery/42926#42926, Motor Vehicle Maintenance & Repair Stack Exchange. https://mechanics.stackexchange.com/questions/28741/can-a-car-ac-unit-be-run-on-just-the-car-battery/28744#28744. 11 Best Battery … You will need to change them on a regular basis. by: Dave Pollard. If your car’s air conditioner isn’t blowing cold air, the first thing you should look for are signs of leaking … Normally people won't melt if they have to do without it for the 20 seconds it takes to pass someone on the highway. Now I wonder if I had shut off the car (to save gas), how long would the battery last if I used the AC. Most batteries' A.H. capacity is stated for the 20-hour rate of discharge. Once all traffic had stopped, simply just rolled down the windows and shut off the car. They are essentially a plate of ceramic postively charged, and one negatively charged. The bad alternator diode can cause the circuit to charge even when the engine is shut off, and you end up in the morning with a car … I have no idea how many you would need, but give these are 1.5 inches many would be needed. the only incorrect way i will think of to do this with out plugging into your place contemporary may well be a small generator. Mnuchin: Stimulus checks could arrive 'next week', Chris Christie renews warning about Michael Flynn, Kilauea volcano erupts on Hawaii's Big Island, Amazon shuts New Jersey facility after virus spike, Saints star ejected for punch, takes blame for loss, Elliot Page thanks fans for their 'love and support', Izzard praised for embracing feminine pronouns, New mom McCain shares pregnancy photos for 1st time. You already know how long can a car idle, but there are some precautions which you have to keep in mind. The UPS module can cater for a certain level of overload for a small duration, however the duration and level of current surges typically associated with A/C units is far greater than the UPS’ … You will need to recharge those batteries and it takes a while to recharge a big battery bank. The electric system would allow you to run soley from batteries in important times, but the engine management could just as easily turn off the mechanical A/C compressor at those times as well. Car air conditioner compressor clutch not engaging Published on October 22, 2015 October 22, 2015 • 85 Likes • 13 Comments So if you have a good quality lithium deep cycle battery you can theoretically run the air conditioner for about 1.5 hours before you need to recharge your batteries. battery ac. Probably cars already do that. Newer vehicles likely use load. Install a second radiator under the hood and 12v pump and fan. The battery has nothing to do with the air conditioner cooling you off; all the battery does for the airconditioner is run the vents. For the life expectancy of the units, they can last for years. A solar panel can run an air conditioner, but it’ll use a large portion of your panel’s capacity. If you don't mind an inferno in your trunk, behind the back seat. However, I can't do this in the summer, when the temperature inside a car can be over 100 degrees F. One advantage I see with HCH II (I do not own one yet) is that since the air conditioner can … Dramsey. What could be wrong? Larger ones exist. Once all traffic had stopped, simply just rolled down the windows and shut off the car. At 5 kW, it would last 12-24 minutes if the full battery capacity was used, but actually only about half of the battery capacity is used (to improve longevity) meaning 6-12 minutes. It's not exactly frugal. If you want to run your AC consistently for the hotter parts of the day and evening, unfortunately, your off-grid options are somewhat limited. But if it's hot, is a battery powerful enough to run an air conditioner? In fact you will need many car batteries to keep this array powered for any length of time. You could in fact attach a window mounted air conditioner like @Spehro Pefhany suggests. I'm pretty sure you can't run the air conditioner all night without someone in the car. If you are using a 15,000 BTU producing air conditioner that requires about 1500 watts to run it, then the two lithium batteries can keep the air conditioner running for 90 minutes before needing recharging. Not like an electric car has an accessory belt... @saurabh64 Tesla, electric cars and many hybrids use, high voltage, electrically driven compressors. Love your Everlasting Gobstoppers, BTW. If that storage area is getting too hot sometimes a simple 12vlt exhaust fan can pull in cooler are from UNDER your tiny home/RV that will give the batteries a “better” environment to work in. An electric AC is unnoticable. I can assume that that outside temperature will be less than 85 but I will need the air conditioner to lower the humidity. For BMW, this is part of their Efficient Dynamics strategy, where they'll switch the compressor on/off depending on engine load to optimize fuel consumption. It made the battery so weak that the starter motor would turn but not enough to crank the engine. Supplied with a 5m long power lead, crocodile clip battery connectors and a handy car window hangar the Airflow Battery Conditioner is easy to connect and use. When we started our testing, you can see in the video that we had about 95% of that power remaining. I'm pretty sure you can't run the air conditioner all night without someone in the car. Electric heat can use 100A all by itself - more than everything else combined. Another reason that I could think of is for those people who might want to take a short nap and want to use AC without the car running. With a good portable AC you can better control the temperature in the vehicle and create a much more comfortable environment and enjoy driving even in extremely hot conditions. Standard (without smart battery) Plus (including smart battery) August 2015 edited November -1. If you want to electrically power the A/C that power needs to come from somewhere. Also an directly drive compressor has to be geared for low engine revs, hence waists power at high revs. A car air conditioner typically has the capacity of 2 to 5 tons which is larger than the central air conditioning on a 2 story house (about 18000BTU to 30000BTU). In a pickup it might actually make sense=- put it in the bed- since a cheap Chinese window A/C is almost free. The bad news is even 1 peltier element requires 7 amps at 12v. The air conditioner, when it’s really cranking in the desert, pulls about 12 amps at 120 volts. There are many reasons to get your air conditioning recharged besides the most obvious one being to keep you and your passengers cool on journeys in hot weather (though we might add that leaving a box of lollies in a non-air conditioned car for too long can be very upsetting for kids and grown-ups alike). You would at-least need 700 amp hours to run for a day. However, if you purchased a bunch, say 20 you could have a setup where you control how cool it gets by turning some off. To run it from an electric motor, you would need to do kinetic at the engine, to electric at the alternator, then back to kinetic at the motor for the compressor. My household fridge (basically an AC unit) uses 250 W to cool down several hundred litres. There would have to be enough power to run a small 5kbtu rv ac unit through your sunroof (with a custom painted fiberglass roof scoop to cover the whole unit ofcourse, allowing adequate air … If you are using your inverter to power air conditioners then you must know that you will need batteries to charge the inverter. The A/C is something like 2.4kW which is about 8,000 BTU/h or about 3HP. Today I went out and used the blowers for about 45-min while I did some work on my laptop. It consists of several major components including a condenser, evaporator, and compressor, among other parts. how can i replace my Car engine from gasoline to desiel ? You can also provide a link from the web. Upon return, whether in two weeks or twelve months, your vehicle will be ready to go, the battery fully charged and in A1 condition. You would have to attach the hot side to a large copper plate, aluminum also could work, and cool the back side. The primary design is for those that have to leave their cars in the hot sun while away. Likewise with brake pump etc. You will need extremely thick wire to handle this many amps maybe 1 awg (gauge). For simplicity you can connect up to 20A on 12 gauge wire so 3 of the listed peltiers. Here's what's in the new stimulus package. In order to get 8 hours of running an air conditioner on battery power, you will need a lot of batteries. Now when the car starts, the "check engine" light turns on and the air comes out un-cooled, just the temperature of the outside air. I was just curious as today I was stopped on the highway for an hour. Also a thermal paste will increase conductivity and heat/cold transference. https://mechanics.stackexchange.com/questions/28741/can-a-car-ac-unit-be-run-on-just-the-car-battery/28793#28793. in addition to an inverter of that length might run down a classic vehicle battery in in basic terms a couple of minutes except the vehicle exchange into working. This might be a silly question but I was wondering if a car AC unit be run off entirely on battery or alternator? An easier approach would be to drop the A/C clutch out when you tromp on the accelerator. This means the alternator would have to work harder to make up for those losses and take more power from the engine. A car alternator recharges the battery and powers certain electrical systems like lights, radio, air-conditioning, and automatic windows. So, one would think we could assume that the battery would run the air conditioner for about one hour. For instance, if you know that your AC requires 150 amps every hour it runs, and you plan on running your AC for three hours each night after the sun goes down, you'll need to add 450 amp-hours to your battery bank in addition to the battery power it takes to run everything else on your RV (150 ah * … Say the air conditioner draws an average of 1200W per hour. Technically, you can run your AC off a couple of 100 amp-hour batteries—it just won't run for very long. 13 Best Battery Chargers for Cars. On smaller engines, you can feel when an engine-driven compressor engages. An optional cigar lighter connector is available for use on vehicles with a permanently live cigar lighter or auxiliary 12V socket. This runtime is longer than typical duration stopped at a traffic light, so it is enough. That said, I don't have any idea how MUCH … The only way the a/c could drain the battery with the ignition off is if the clutchh relay were to stick, keeping the clutch engaged. That is the big factor that most people miss. I wonder how AC works in Tesla cars as they are completely electric cars. The high voltage part of that makes a lot of sense. An optional cigar lighter connector is available for use on vehicles with a permanently live cigar lighter or auxiliary 12V socket. If you wanted to use battery power, you would need very large batteries and a more powerful charging system. From that, I would expect an absolute max of … 54 sections 18650 lithium battery composition Normal use for about 5 hours, 3.5 hours at full load. An electric car does things differently because there is no engine, and so delivering power to the AC and just about everything else is determined by the amount of stored battery energy. You could attach the cold side to the back seat and put giant set of heat sink fins in the trunk, with 12v fan to keep it cool. NYBo. So, yes, you could run the air conditioner, provided you sit in the car with your foot on the gas, otherwise you will run you. 13 thoughts on “ Best 12 Volt Battery Powered Air Conditioners for Camping or Traveling ” Montie June 18, 2020. 1 Like. At idle, it would provide less than 50 amps. An electric car does things differently because there is no engine, and so delivering power to the AC and just about everything else is determined by the amount of stored battery energy. I would like to travel in my car but because of health issues I would need to be able to sleep in my car also, or at least rest for long periods. On the other hand, Teslas store a lot of energy. from that I would guess that your 8000 btu would take 800 watts, which is more than your inverter would put out. So if you have a powerful air conditioner, you’ll need to make sure your solar panel system can … If you run the fans off of batteries, you can expect about 10 hours of runtime. Speaking of 12vlt, there has long been a market for 12vlt air conditioning that still has yet to meet the demands we all want and desire. Also, if the battery becomes depleted, the internal combustion engine is started to recharge it. At 5 kW you'd drain a (really big) 100 Ah battery in 12 minutes. Continue Reading. I asked on another forum and was told to expect only 15% battery use. Let’s take a look at AC energy requirements and typical solar production to see if solar panels can really run air conditioners in each setup. So although I don’t see how the air conditioner could drain the battery, other electrical accessories can, in specific circumstances. Are you asking if this can be done on a normal car or if there's such a thing as an electric compressor for a car? Running the compressor while the engine is off is another matter. https://mechanics.stackexchange.com/questions/28741/can-a-car-ac-unit-be-run-on-just-the-car-battery/28746#28746. If my memory serves correctly.. it takes about 8HP worth of load to drive a vehicle A/C compressor in Phoenix on a hot day in a full size car. Is all of this can be considered as a “dirty” load due to continual switching causing voltage current. You numbers or calculations without some work, and compressing the liquid a. 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