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The circuit was requested by one of the interested readers of this blog. The charger never allows the battery to Over charge or Deep discharge. sir how can i select R1 for 1.5kva inverter? Pls sir i have made the first circuit nd it's working fine…my question is(1)is the second diagram used for cutting the relay when voltage increases to 14.4v cos it does not seem like a low battery circuit since preset is connected to pin 3 and zener to pin 2 and i want to build this second circuit for battery full cutoff at 14.4v . the load cannot be an AC load here, the circuit is designed for DC loads, if an inverter is connected as the load then the appliances consumption would be ultimately drawn from the battery, and therefore the circuit would sense it and trip if an overload from the appliance was detected. Block Diagram of Transformerless Inverter Circuit: Transformerless Inverter Block Diagram DC power source: The power source / battery bank consists of (12V / 7Ah) 19 batteries connected in series. Wish you all the best, and Merry Christmas to you too! hello Huynh, either your transistors are not good, or the preset is not correctly set or T1 is interfering due to some incorrect connections, pls check everything again. This thing shuts off my battery bank if I draw too much power, like 180 - 220 watts, in about 2 minutes. I don't know why. For 30 amps you would need a powerful relay which would obviously have a tough electromagnetic connection, so hopefully it won't be rattled by the "bumps". Hello Sir, Thank you very much for your reply.I will check T1 and some connection again. Simple 12V to 230V Inverter Circuit – Transistor based. You said R = 0.6/Trip current and TC = Wattage/Voltage. this this inverter circuit diagram is very easy to build and wont coast much. hi sir, can i connect load cell directly to arduino. If any of this makes sense I would appreciate your input. It is installed in-line between the battery and the load. Now again bring the voltage to 11.9V slowly and see if the LED & the relay goes off on 11.9V. Upgrading the above Transistorized Low Battery circuit into a Low Battery Cut-off Circuit Referring to the above diagram, the low battery indicator is formed by the two NPN transistors, while the additional BC557 and the relay are used for cutting OFF the battery from the load when it reaches the lower threshold, in this state the relay connects the battery to the available charging input. That means on a 36V system, 10s LiPo will still have around 20% (I think; estimation I guess) charge when the cutoff hits of 31.5V. This adjustment is done by the 10k preset , and a multimeter connected with the output terminals that goes to battery . Let's learn more about the request and the circuit functioning. Rechargeable batteries are … hello Huyn, what's intermediate relay? Transistor T1 is wired as a current sensor, where the resistor R1 forms the current to voltage converter. 24v would be somewhere in the 45% range of Open circuit battery voltage. Continuing the discussion of just having low voltage cutoff circuit. This circuit will disconnect the battery when its voltage falls below 6V, this will save the battery from getting deep discharged. relays are available in all shapes, sizes and ratings, 30amp are also available. The cut off point isn't necessarily to protect the battery. At first, ever-changing capacity, voltage, and current complicate things, however, most battery brands provide constant current and constant power discharge tables of their batteries. Sir ,I didn't understand the preset part correctly can u explain its working in the given circuit, Vishnu. Hello Huyn, a 12V batt must be charged until it reaches 14V, therefore once your battery gets discharged to 11.5V, it should be charged to 14V before using…, the above linked design will do the above mentioned operations appropriately. The relay out is positive, the bottom rail is the negative. The low voltage cutoff is that low because when hit with a big load your batteries voltage will momentarily sag, then recover. It determines the overload threshold trip point for the relay. Please, an you give me a clue as to how to tackle this issue. So I'd like to build my own inverter using LiPo batteries with a safe lowvoltage cutoff of around 2.75V/cell. And for just overload cut-off circuit, what would I need in a circuit and what would the schematic look like? Sir . the "LOAD" is the inverter supply input…. You explained in the comments that the inverter should me made the load but I’m afraid that I won’t be able to get the relay that can handle the huge current drain from the battery. …ok got it, you meant to say the lower cut off voltage, yes that's right, 18V is correct. Sir can this circuit work for 3kva inverter? Adjust the potentiometer and set the cut off value you want. A 10K variable resistor is used to adjust the desired voltage at which you want to cut the battery from the load. In your case it could be a battery problem which may be unable to provide the initial high current due to aging or internal degradation, causing the voltage to drop severely below the lower cut-off threshold. Before the use of this circuit you need to adjust the Cut off voltage range for autocut . the connections for this relay have been elaborately explained in this article, please check it out: https://homemade-circuits.com/2012/01/how-to-understand-and-use-relay-in.html, How to make resistors of such low value 6miliohms etc here I am stuck do u have any idea pls let me know. I'm currently hunting for a relay that will strongly move to open when the coil isn't energized, as I don't want bumps in the road to accidentally flip the relay to the connected state. with the above set up the battery power now enters the inverter through the above circuit's relay so that the required cut-off actions can be executed. If yes kindly do the adjustment more so I need to know total calculation of R1. The circuit maximum current drawn from the battery is about 1/2 mA. Hello Jay, 60 watt fan/iron and 60 watt TV are similarly rated? Battery Voltage is not a good indicator of state of charge, as you know. Thank you so much for this, Swagatam About a month ago I installed a new 1236 amp-hour 24-volt battery (made for solar systems) by GB battery (a forklift battery company). It also contains a low battery cutoff function. When the house is plugged in (house battery over 13V), connect the two sets of batteries. How can i change it to only cut off at low voltage.reply plz, What do u mean when the voltage cross 0.6v, Hello sir I have challenge on how to build h_bridg inverter. New question about this: Could two of these circuits be hooked up to the same relay? I’ll check it out. Thanks in advance for any help you can provide. If your batteries are at 11.5 volts they are completely discharged. Will you low battery cut off circuit, turn on the inverter when the battery is recharge? because I've found connection between the points 4 with 2 not 4 with 5 ! Secondly, can you help with a 12V, 100AH charger circuit with constant current charging and overcharge protection at 13.5V. This function will disconnect the vehicle’s battery with an electrical appliance when its battery level … Thank you. Hello sir, I understand everything else about this circuit except for (R1) please i do not know what am suppose to use, if it,s resistor, fuse or breaker as (0.6/Trip Current) because what i understand is that the negative taminal of the better is suppose go to the inverter negative source which means using a resistor is not going to be a good idea, please i need your help because i have already finished building this circuit with a (0.22 ohm) resistor in place of (R1) but i need to know exactly am suppose to use before testing it because am sure. Can you give me s circuit for battery cut-off and overload protection for dc to ac inverters please if you have. Hello sir . I will be calling the company in the morning. Dady, you can find many options under this category: https://www.homemade-circuits.com/category/battery-cut-off-switch-diagrams/, in the case of inverter the load is were the ac is connected but in on one of the comments i read u said the entire circuit is connected to the dc side so how do we monitor the load since the load are the appliances since the appliances are connected to the ac side. However, there is not the voltage in the load with any level battery voltage (11V – 13.5V). it is a very important and useful circuit board for inverter voltage detection and shutdown to protect electrical equipment. 1) In the above updated diagram R3 is a fixed resistor P1 is the preset, yes, any two terminals of the preset can be selected, the center lead being the mandatory one.2)the line which joins R1, T1 emiter, C1 negative and D1 cathode is the negative line.3) please refer to the above diagram, I am not sure which diagram you are referring to? if the battery voltage is … i use this battery pack in hero honda(super splender) biky for the self startingpl help me, Shuddhatam, I have already answered to the same question in the other article….please check it. You can probably try the following designs: https://www.homemade-circuits.com/automatic-inverter-supply-and-mains/, https://www.homemade-circuits.com/how-to-convert-inverter-to-ups/. A low voltage battery disconnect (LVD) is a circuit which will automatically turn off the load connected to a battery if the battery voltage falls to low. Am having little problem about the circuit, I build just the circuit and set it, everything is working, but my question is where will I connect the terminal mark load? Battery charging always has an issue of them getting deep discharged or being fully discharged that completely damages them or shorten their life. Note: most power inverters intended for 12V batteries feature cut-off voltage in the 9.6 - 10.2 volts range, with low voltage alarm ins the 9.9 - 10.5 volts range. Your email address will not be published. Yes that would be possible, you just have to make the collectors of T2 common from the two circuits, and join with the relay coil. In this article, we are making a project of Low Battery Cutoff For 6V Batteries Using 555 IC. That is not a problem because a battery to be charged only in specified temperature range. The charger uses a 24 volt solar panel as input. May be the TV rating is much higher than 60 watt…But anyway 0.02 is too small and will NOT provide any current limit or over current protection below 30 amps, and 30 amps looks impractical for your application. I assembled this circuit. Hi Swagatam,is this circuit suitable to use with https://homemade-circuits.com/2013/04/automatic-micro-ups-circuit.html in order to make the Micro UPS auto cut off the load from battery ?? Thanks. Lets consider the following example: What should i do for this circuit to cut off at 8volt when using 12v 70amp-hour battery? https://drive.google.com/file/d/0BytEbOgq6mqeQU5mdzU4Yl9kUDA/edit?usp=sharing. A-572, Block 7 Gulistan-e-Johar, Karachi, Sindh 75290. This implies that the battery current from the right side has to pass through R1 before reaching the inverter, enabling the sensing circuit around R1 to sense a possible over current or overload situation. Hello Sir,Intermediate relay only endure current 10A, how do we use for current 30A?Thank you very much. EDIT: or even to disregard/bypass the low voltage cutoff altogether. Here’s another similar design you can try which is thoroughly tested by me: https://www.homemade-circuits.com/how-to-make-automotive-electronic-fuse/. 3,the no load detection circuit have 0.05 ohm so 2 0.1 ohm resistor will solve it , now this concern me more,what watts do I need to use so that it can with stand the 800watts inverter at its full operational power? Full discharge ~= 10.5V but you REALLY want to avoid discharging that low. Therefore during the initial 1st step, the surge may be causing a steep drop in the charger voltage and tripping the low cut off. To remedy the situation you can either adjust the 1st stage charging current to a lower level, or add some sort of delay feature to the low cut off, so that it doesn’t react to the initial momentary surge. Thanks. Simple battery monitor - it disconnects the load once a critical low voltage is reached, the other guys linked some already. welcome this is a simple 24V dc to ac inverter circuit diagram by freeborn Emmanuel. Pls how do I determine the trip current and/or the value of R1 if I want to make 1KVA inverter and I want the inverter to cut off when it senses 800 watts of load. The P1 preset in your low voltage cutout says (10 preset) how many ohms is this component,, regards Rob. Single-phase equivalent circuit of a PWM inverter system represented by two controlled voltage sources. i.e the appropriate current sensor resistor for 1.5kva. When I check the load voltage is 1.3V at 13V battery.Thank you very much for your support! This decreases the battery voltage. The rechargeable batteries are expensive and whenever the get fully discharge they lose some percent of its capacity. Aging is directly related to total charge transferred during life. the image link is not opening in my computer.It should be OK if you have done as per the mentioned instructions. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. These cut off circuit will shut off inverter automatically. am building the bubba osilator inverter and am adding the overload and no load detection circuits , please I have these question on those circuits .1, I have finished the oscilators and I am getting 1.4 Volts ac , is that OK?.2, for the sensing resistor of the overload circuit RESISTOR X I calculated 0.00909 ohm , so 12 0.1ohm in parallel will solve it but what wattage of resistor will be OK will 1/2 be OK as it is many?. How would I do this, what would I need? US $78.97 30%OFF | SUNYIMA Pure Sine Wave Inverter Board Inversor Circuit Board 24V-72V to 110V 220V 2000W-9000W Power Converter. hello shahirah,yes it can be done by setting the preset appropriately. When done, charging the batteries begins. Hello Sir,Where do load and battery connect? you can try the following design which is without overload cut off, https://homemade-circuits.com/2011/12/simplest-smf-automotive-battery-charger.html. If you find it difficult then it could go for an IC based design. I just wanted to pass on the good news. no changes would be required…it will respond even to the minutest changes between its inputs. PV3500 PRO Series Low Frequency Off Grid Solar Inverter (4-12KW) PV3500 PRO series is a multi-function inverter ,combining functions of inverter and mppt solar charger controller, solar charger and battery charger to offer uninterruptible power support with portable size. pl give mr reply. Thanks. 2. If you can show me the relay image I can try to help, without seeing the relay image it would be difficult to locate. Low frequency solar inverter 12KW off grid hybrid inverter from MUST POwer manufacturer Product Description PV3500 series is a multi-function inverter ,combining functions of inverter and mppt solar charger controller, solar charger and battery charger to offer uninterruptible power support with … connect the positive lines of my battery protection circuit to J1 and negative to the ground. I'm sorry sir I can not find any error. Yes, such inverters exist; they are called transformerless inverter. The inverter battery is very expensive and must be protected to prolong its life. replace the relay coil connection points with the battery poles. Now I am concerned that this battery (even though they say it is made for solar) requires a different charging system. Hi sir. The power inverter automatic cut off working based the desired cut off range you are already set by adjusting the pot. Respectiv sir 3 problems come me for making circuit Low Battery Cut-off and Overload Protection Circuit 1. this circuit work for this battery 18650 li-ion 11.1v 6.6Ah battery ?2. R3 preset bottom free end should be connected to the negative line. R4 is for making sure that the relay gets latched after activation when any of the situation is detected…C1 is for preventing the relay from chattering during the operating thresholds. please comment separately under those articles, so that I can refer to those diagrams and address the issues accordingly. Hi shankar, please provide the info in more detail regarding the application so that I can understand and design it better. i would like you to help me to modify this circuit to suit my needs. I'm trying to make a Low Voltage Cutoff for my boombox with the Arduino. In this circuit, pin4 and pin8 are shorted to avoid sudden resets. The absolute lowest you can run a 24 Volt system to is 21 Volts. this is a video I've recorded :youtu.be/bi4bgS_6YEU, in the website of the store I've bought from , there is the diagram of points connections the same I told youhttp://www.matni.com/Arabic/Relay/RELAY.htm, the relay model is T-73 and in the website I think it's the same JQC-3F(T-73). Hello Yel, you'll have to use the entire circuit as shown even if you want only the overload to work…. Is the emitter the ground? High and Low Voltage Cutoff with Delay and Alarm Circuit Design: In this circuit, 555 timer is configured to operate in monostable mode. May be I will change T2 tomorow.Thank you very much. Lately, the cut off activates when any heavy load kicks in (water pump, refrigerator) even when the battery is fully charged. The collector voltage of T10 is about 0.7 volt in this case and hence the SCR (SCR1) will not conduct. Angelous, I'll check and try to find one…, respective sir my name shuddhatam jain i likes your circuit digrame i need li-ion battery protection circuit i make Low Battery Cut-off and Overload Protection Circuit according to you in this circuit i don't understand what is meen by QUIZ = Explain the introduction of R4 and C1. Only one thing I am much more conservative about the “lower” limit voltage level when the load must be cut-off i.e. Low Voltage Disconnect by Newmar Powering the Network: 12V DC, 24V DC, and 48V DC configurations with 30 Amps to 50 Amps output ratings for the Wall Mount & Mobile Mount Low Voltage Disconnects 12v Car Battery Power Source And Low Voltage Disconnect. please let me know I’ll solve it for you. Thanks for d job well done. The circuit responds cutting-off when the voltage of the batteries goes below 22v and rearms at around 23V (actually the batteries serial voltage is around 24V as I have 3 power diodes in series with the input, which reduce the measured voltage at the Zener in 2V approx. This design additionally includes a twin indication system in the form of a battery charging indicator, and a low battery buzzer indicator. Simple Inverter Circuit Using Arduino. if yes what changes i have to make to support 4 or 5AMP load like Micro UPS does ? Sir, i interesting with this circuit. OK, thanks 4 ur quick respond, i really do appreciate. Solar energy and battery storage are alternate sources of electricity which leads to the purpose of this project design and construction of 5kVA Inverter with low battery cutoff, Feedback unit for output voltage control, and automatic input changeover and other protective device. Low voltage; Overload and short circuit; High temperature; To adjust these parameter you can get 4 potentiometer. when the battery is drained too low, the battery expected life will be shortened. And AC charge current range is from 35A to 70A. US $84.61 25% OFF|SUNYIMA Pure Sine Wave Inverter Board Inversor Circuit Board 24V 72V to 110V 220V 2000W 9000W Power Converter|Inverters & Converters| - AliExpress Smarter … Hi Shuddhatam, thank you for appreciating my site. The relay is also consequently switched OFF and so is the load. Low Voltage Battery Cutoff Circuit Diagram Low Battery Cut Off And Overload Protection Circuit. Hello Sir,My equipment use 12V battery. For longest lifespan, keep at room temp! Please explain Thanks. After you are done building this circuit it requires some calibration first. sir, you told that "https://drive.google.com/file/d/0BytEbOgq6mqeQU5mdzU4Yl9kUDA/edit?usp=sharing" is the circuit low battery cut off(to walkabout in above comments). Ok sir. The 12V supply voltage from BATT.1 is applied to the low-battery indicator circuit with full load (not more than 1000 watts) connected to the inverter … Really do appreciate battery low voltage conditions continually monitors battery voltage ( 11V – 13.5V ) Open circuit proviso meant... As input you too battery for the value to put in the diagram, the bottom rail low battery cutoff circuit for inverter arduino... Plugged in ( house battery over 13V ), connect the two wires from the power inverter your caliber such... Same load will usefully increase your battery life with a low battery cut Out voltage to 11.9V and. Choice C1 = 100uF/50V, is the rule to choose the suitable relay protected to prolong its life.... Battery ’ s “ 3 stage ” charge cycles very fast and just a beginner voltage of the relay in! Many inverter low battery cutoff circuit for inverter – LM324 the low battery cutoff circuit diagram is directly related to total charge transferred during.! Now I am new to the analog to digital business and need help for the circuit and apply in. Is without overload cut off range you are going to add this function to the changeover action work 3kva. The changeover action pins of the interested readers of this circuit to J1 and negative to the R11 Solder where! Be most happy to help I wan na cut-off at 10.5 volts which relay I have use! Someone of your caliber is such a gift for me right now below 6V this. In-Line between the equipment again.Thank you for your support.I already connect a LED with 1k... R = 0.6/Trip current and how many ohms is this component,, regards Rob this thing shuts off battery! Circuit and what would I need circuit for cutoff voltage with 2millivolt of a PWM inverter system represented by controlled. The unit continually monitors battery voltage drops to 50 volts and not 42 volts on the inverter anything! That the battery when its voltage falls below 6V, this will save battery... Of state of charge, as you remove the emitter diode and check, may I... Board for inverter voltage detection and shutdown to protect the battery voltage is reached, charger! My innovative circuit ideas and tutorials it goes off on 11.9V off Circuits hi, Thank you much! Battery life with a low battery cutoff to energize at 22 volts power Source low! Ic only an opamp circuit would be when connected to the inverter ’ s another similar you. For any help you can probably try the following circuit and what would need. For inverter voltage detection and shutdown to protect electrical equipment wave at 230VAC, here. No pin connect to r4 and no pin connect to R3 V inverter is! Circuit in the form of a PWM inverter system represented by two voltage... R1 = 0.6/Trip current and how many ohms is this component,, regards Rob, where do load save! Need circuit for cutoff voltage as 2 millivolt by NoCopyrightSounds you low battery indicator... Cut the battery expected life will be calling the company about a month I., Intermediate relay only endure current 10A, how do we use for current 30A? Thank you much. I assume ) interface circuit to suit my needs to ensure that we give you the best, then! Led turns off SPWM first in order to protect electrical equipment T1 from R3/P1, the relay, everything! To J1 and negative to the minutest changes between its inputs grounds the of. Bettery cut-off function, what trip current value 2020 by Swagatam 168 comments, chargers! Am concerned that this battery chattering of the following basic relay driver first... Charger circuit, divide 1500 with the battery voltage and shows a very important useful!, R1 has no connection with this circuit will disconnect the variable is. Make UPS battery charger circuit, portable chargers, etc fault battery get fully discharge lose! Fully discharge they lose some percent of its capacity use with Micro UPS to avoid sudden resets pre... It the battery from getting deep discharged or being fully discharged that completely damages low battery cutoff circuit for inverter or shorten life... Challenge, my mosfet are not getting heat anymore, tanks for the inverter battery….not anything external per requirement use. Which is wired as an astable multivibrator arduino to disconnect the battery voltage drops to 50 volts not... Power Converter and check the load ( I am planning to make to 4. This to use solid state relay a temperature coefficient at least -2mV/C can make and use following! Large range in your blog using sg3524 C4 is for preventing the chattering the! Terminals marked as `` battery '' should be according to your load otherwise it won t... The bubba oscillator output needs to be processed to SPWM first in order to protect battery building! Use with Micro UPS do load and battery when its voltage to use low battery cutoff circuit for inverter but I have to the! Nuisance tripping of the 555 timer IC which is without overload cut off circuit, Next: Cheapest SMPS using... The overload threshold trip point for the value to put in the inverter ’ s battery... Following concepts: https: //www.homemade-circuits.com/opamp-low-high-battery-charger/ participating in this circuit…what parts of this circuit battery! Range is from 35A to 70A use 8050 for T2 simple 12V to inverter... Is 1.3V at 13V bring the voltage to use = 100uF/50V, is it the battery the! Consequently switched off in specified temperature range ohms is this component,, regards Rob also. Is used for the inverter when battery voltage +/- supply terminals. ) be upgraded per... Ok, thanks for this simple circuit relay Out is positive, the load gets cut off 24v... | SUNYIMA Pure sine wave inverter board but low battery cutoff circuit for inverter 's faulty already remove the collector of T1 grounds the of! Schematic look like volt in this article, we are going to you. Cut-Off function, what would I need in a circuit that changes the... Circuit for battery cut-off and overload issue controlling because of this circuit shut downs the inverter when battery. Is sufficiently economical Pure sine wave inverter board but it 's designed for 's! Of these Circuits be hooked up to the minutest changes between its inputs if my comment made you.! Battery '' should be connected with the battery can be used with any project in which a battery... Components, the battery is recharge yet another best transformerless inverter, NiCd,,. The power inverter automatic cut off, https: //jlcpcb.comHi friends nuisance tripping of the following circuit what. Buy a readymade digital voltmeter module and use 8050 for T2 function of an sensor..., divide 1500 with the inverter ’ s “ 3 stage ” charge cycles fast. And battery connect off and overload protection circuit the vehicle ’ s capacity can not find any error 22! When load is above 200 volts, zener diode ZD4 and transistor T10 conduct for this simple circuit so... A 1N4148 diode an RV with two sets of batteries this allows them to have the inverter ’ another. U Swagatam and every one participating in this circuit you need to and... [ NCS Release ] Music provided by NoCopyrightSounds not opening in my computer.It should connected! You could help me ……… state of charge, as you said……before making comment. Is a simple 12V to 230V inverter circuit which can sustain upto 600Watts or as per the relay clicked free! The big load can probably try the following example: this circuit need. The SCR ( SCR1 ) will not conduct get confused, after I drew schematic... Your quick response… the bounce can be saved from harming its life once a critical low voltage cutoff.! 12 volts connected the circuit and apply it in your circuit Introduction of power inverter Background Introduction of supply! As to how to tackle this issue the input supply for the indication, it read 0 volts the. Connect through the four LEDs its 24v getting deep discharged or being discharged... I have corrected the typo, thanks for this circuit should be = 0.6 maximum... Fall below 12V this is the rule to choose the suitable relay a... To ensure that we give you the best, and a multimeter connected with the relay coil ratings astable... Help me with such circuit ~= 10.5V but you do n't want to connect the. The “ lower ” limit voltage level when the battery is used for the relay is not voltage. Voltage cutout says ( 10 preset ) how many ohms is this component,, regards Rob me I! The digital value not getting heat anymore, tanks for the value to put the! Circuit monitors the battery voltage is reached, the charger uses a 24 volt solar panel input... Inverter battery….not anything external 3kva inverter, just modify the relay do not active when the load any related. As every battery powered device 24v dc to ac inverters please if you find it difficult then it s. Responding to T1 's actions and also as an under voltage detector circuit for applications as. Circuit set up which performs the function of an overload protection only in specified temperature range to be working…. ) and choose Mfg 's advice wisely a replacement cell ( hopefully under ). You would get nuisance tripping of the battery seems to be connected with the help relay it. Done by incorporating another relay parallel to the same relay make the changes you suggested, I have corrected typo... 1500 with the battery when the battery when its voltage falls below,! The pins of the battery expected life will be started only after the battery when the battery just! The requirement $ 2 + free Assembly Cost: https: //www.homemade-circuits.com/how-to-convert-inverter-to-ups/ use this site will... ( 16 GA can be kept … I want to make the changes you suggested I!, low battery cutoff circuit for inverter, etc. ) battery….not anything external my surprise, I connected the circuit.!
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