On smaller engines, you can feel when an engine-driven compressor engages. Keep it in a … How would you handle the air flow/circulation? It runs off of a rechargeable battery that is built into the unit. 2 105 amp alternators, big high amp inverter, custom capacitor setup for the surges? This Enerdrive 12v Lithium Battery Setup will allow you to run your air conditioner and other heavy amp drawing 240v appliances without the need for a generator or mains power - making caravanning a lot more … 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). I don't know how feasible it is to retrofit an existing AC system to electric. eddo March 20, 2019, 4:43pm #14. … A typical solar setup looks something like this: Your inverter, solar panels, and battery bank will all need to be sufficiently powerful to support the amperage draw of your AC unit. Our hypothetical car battery contains 50 amp-hours at 12 volts DC. The battery has nothing to do with the air conditioner cooling you off; all the battery does for the airconditioner is run the vents. Once all traffic had stopped, simply just rolled down the windows and shut off the car. In a pickup it might actually make sense=- put it in the bed- since a cheap Chinese window A/C is almost free. That test was done at full power and trying to cool a hot 86 degree F RV down to about 66 degrees F. Car would not start this morning, AAA told me it was my battery and installed a new one. Solution, turn the ac off before I turn off the car, to let the battery get back to 12 volts so I can crank my engine over the next day. Most batteries' A.H. capacity is stated for the 20-hour rate of discharge. I can hook up 2 alternators to my car but have seen 10 to 15 alternators hooked up to the subwoofer competition trucks. I can hook up 2 alternators to my car but have seen 10 to 15 alternators hooked up to the subwoofer competition trucks. https://mechanics.stackexchange.com/questions/28741/can-a-car-ac-unit-be-run-on-just-the-car-battery/28758#28758. Your battery will die quickly. A typical 12 volt flooded-cell battery, delivering 100 AH, weighs about 50 pounds. (How do I know this, lol) Not a perfect solution, but much cheaper and easier than trying to compress the AC coolant electrically. furthermore an inverter of that size would run down a normal car battery in just a few minutes unless the car was running. how can i replace my Car engine from gasoline to desiel ? 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 * … Hence an electric compressor can give better MPG. They are: Keep the car maintained and service on a regular basis. share | improve this question | follow | edited Oct 11 '16 at 17:05. anonymous2. If you use the vehicle battery then the charge come from the alternator and therefore the engine - btw the alternator can take approx 10bhp or more if producing full charge. Charging of inverter for air conditioners. What will happen if I change the battery at even higher CCA when it needs to be replaced? The LifeSmart cooler is a great option for you if you think you might be near electric hookup for some of your camping trip. 0. 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. For the life expectancy of the units, they can last for years. Electric heat can use 100A all by itself - more than everything else combined. It is possible to run your air conditioner for extended periods of time while you free camp - purely from your 12v Battery. it's fine as long as you aren't driving a clunker. Sure, just find a space to add an electric motor in the engine compartment, re-jigger the belts so that the electric motor drives the compressor, and make it so it starts when the compressor clutch would have engaged. I want a mini a/c unit that I can use in the back of my van. If you're trying to calculate how many batteries you'll need to power an air conditioner off-grid, the answer depends on how long you want to run the AC. Upon return, whether in two weeks or twelve months, your vehicle will be ready to go, the battery fully charged and in A1 condition. The A/C is something like 2.4kW which is about 8,000 BTU/h or about 3HP. 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. Then you will have to connect those wire bundles to even thicker wires and so on. 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). Car would not start this morning, AAA told me it was my battery and installed a new one. 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 … I know the ECU for the early late 80s/90sDodge 2.2/2.5/3.0 will disengage the AC clutch at WOT. 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. 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 is possible to run your air conditioner for extended periods of time while you free camp - purely from your 12v Battery. 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. Would be nice for turbo cars that have to run a big front mount intercooler. 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. I need to sleep in the back with the car on. An optional cigar lighter connector is available for use on vehicles with a permanently live cigar lighter or auxiliary 12V socket. Technically, you can run your AC off a couple of 100 amp-hour batteries—it just won't run for very long. If your alternator has a bad diode , your battery can drain. 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). So although I don’t see how the air conditioner could drain the battery, other electrical accessories can, in specific circumstances. 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. That said, I don't have any idea how MUCH … Several companies (VAG, BMW) have switched to AC units that are driven by electric motors. As @JPhi1618 noted, the compressor is mechanically driven. Finally to a car battery, hopefully a 2nd car battery. Well, Teslas (and presumably other all-electric cars) have A/C so it's not impossible, but A/C takes a fair amount of power. The air conditioner will be more efficient while the car is moving since more air will be flowing over the heat exchanger. The high voltage part of that makes a lot of sense. Comments . Currently, you take kinetic energy from the engine, and transfer it to kinetic energy at the compressor. Running the compressor while the engine is off is another matter. So you could mount these either inside your door, or perhaps behind the backseat. 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. This might be a silly question but I was wondering if a car AC unit be run off entirely on battery or alternator? Also a thermal paste will increase conductivity and heat/cold transference. Join Yahoo Answers and get 100 points today. 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. Other companies use similar strategies, BMW is just the first I could find that offered some explanation of why they switched to electric AC. This Enerdrive 12v Lithium Battery Setup will allow you to run your air conditioner and other heavy amp drawing 240v appliances without the need for a generator or mains power - making caravanning a lot more comfortable. 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 … from that i might wager that your 8000 btu might take 800 watts, that's extra advantageous than your inverter might placed out. … On a per-charge basis, a battery-powered AC unit can last anywhere from 4 to 24 hours. 1 amp/hour means the battery can put out 1 amp for 1 hour. In fact a central A/C unit for a house uses more electricity than anything else (in a hot climate). Not hard to do, there's one in every residential AC unit there is. So, one would think we could assume that the battery would run the air conditioner for about one hour. In fact you will need many car batteries to keep this array powered for any length of time. 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. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy, 2020 Stack Exchange, Inc. user contributions under cc by-sa. The AC runs by changing the state and pressure of a liquid, and compressing the liquid is a big part of that cycle. Another major selling point for the Lifesmart Indoor/Outdoor Single Port Air Cooler is that it is extremely efficient in cooling a space. Yes, the HCH-II can run the AC system entirely off the hybrid battery pack. If you are using your inverter to power air conditioners then you must know that you will need batteries to charge the inverter. 1 Like. 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. However, if you purchased a bunch, say 20 you could have a setup where you control how cool it gets by turning some off. I have gone out to my car on my 45-min lunch break several other times and used the radio and the AC blower fans to move the air in the car and have not had any issues with a dead/weak battery. An compress driven by an electric motor only takes the power it needs. At 5 kW you'd drain a (really big) 100 Ah battery in 12 minutes. These portable air conditioning units have been designed to keep you cool whether you’re in a tent, camper van or a small room. You will need to change them on a regular basis. I wonder how AC works in Tesla cars as they are completely electric cars. In a normal car, there is no way to run the A/C without running the car. With a single gallon of water and 40W or power you can get up to 10 hours of cooling. When the vehicle or craft isn’t in use, connect the device to the terminals. I can't give you numbers or calculations without some work, but I can tell you than energy is never free. October 1, 2016 - If your car's air-conditioning system blows only warm air on hot days, it's probably because it is low on refrigerant. The air conditioner will be more efficient while the car is moving since more air will be flowing over the heat exchanger. No free lunch. 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. You can also provide a link from the web. 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. The fan will work for several hours if the battery is good but I wouldn't chance it what if the battery is a little weak and the car ends up dead in traffic not good my friend. The possibility of a second battery with a split charge system still requires the energy to come from the alternator and engine. Car air conditioner compressor clutch not engaging Published on October 22, 2015 October 22, 2015 • 85 Likes • 13 Comments , Teslas store a lot of sense kW you 'd drain a ( really big ) AH. Unnecessarily large, https: //mechanics.stackexchange.com/questions/28741/can-a-car-ac-unit-be-run-on-just-the-car-battery/42926 # 42926, motor vehicle Maintenance & Repair Exchange! 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