If you change the voltage, but leave the wattage (total power) the same, then the amperage has to change as well. To calculate the DC watts into AC watts use this formula: Solar AC Watts = (DC watts * Inverter inverter efficiency rate) / 100, To calculate the solar DC amps into AC amps, Solar AC amps = (DC amps * Inverter inverter efficiency rate) / 100, When converting DC watts into AC watts there will be a conversion loss of5-15%because of the inverter efficiency rate, Internal temperature and standby power consumption of an inverter is the reason for their less efficient rate, And also using the wrong size wire will cause some power loss because every size wire is designed to handle a limited amount of current, So make sure to use the correct size wiring between the battery bank to the inverter. You have the question reversed. An amp to kW is an electrical energy converter. Set your multimeter so the arrow points at the "ACV" or "V~" option for measuring the AC voltage. After reading this article, we hope you will have enough information to ensure that you are making a fair comparison when considering solar offers from different companies. Divide the peak voltage by the square root of two to obtain the RMS voltage, which is equivalent to the required DC voltage. With just one battery it only runs 3 minutes the overloads the battery. Let C_1=C_2=C_3=4 \ \mu F, C_4=C_5=6 \ mu F, and V = 30 \ V (see the figure below). Request PDF | An enhanced power DC-AC buck converter | This paper presents an enhanced power DC-AC buck converter.The main aim of this research paper is to ensure that the conventional H-bridge DC . All Rights Reserved. Not as major as other losses, but still a noticeable effect. Monday-Friday: 10am-6pm EST Saturday: 10-4pm EST, By Benjamin Strusnik BatteryStuff TechJordan, this calculator is a simple AC to DC conversion. Created on January 18, 2012, Last Modified on November 4, 2021, For Questions and Tech Support, please submit your question with our, Read Knowledge Base in RSS news reader with. Where V L and I L are the RMS value of the applied line voltage and line current respectively and P.F. If a switching power supply is used the overall efficiency is liable to be in the 75% to 90% range. Jeremy Fearwww.batterystuff.com/kb/tools/calculator-sizing-a-battery-to-a-load.html. For easier explanation, let us review the example below: We have a circuit with 1kW power at 120volts. I would suggest giving our tech line a call for further information, but a lot of this may be trial an error till you come up with the right system. The inverter you select must be able to handle that draw, and you might want to talk to the manufacturer to see how long that surge lasts. All rights reserved, When you are done with the first column of the international power supply calculator, head for the next section where you will find the title . Result: 12000 BTU is equal to 3.52 kW. I have calculated that I need 300 Amps DC per day. The same calculations will work. Solar Info: The Down Low on Everything Up High, Calculator | Sizing a 12 Volt Battery to a Load, Calculator | Determine Run Time for Specific Load. Be warned the cooling fan at that rating is likely to be loud. So if your drawing 3 amps from a 3amp/hour battery, that battery would last about 1 hour? This is why most RV's come with a gas water heater over an electric water heater. Once you find the watt amount from the AC volts x amps, you can divide the watts by DC volts to get DC amps, plus 15%. Of course, this is at peak performance, so the ratio is, in . Inverter Efficiency:Read the product description or specs sheet on your inverter (usually located at the bottom side). For example a 7.6 kW inverter can produce an output of up to 7.6 kW AC. A Cryogenic dc-dc power converter for a 100 kW synchronous HTS generator at liquid nitrogen temperatures. On the other hand, AC watt is the form of electric power that runs various equipment, including your household appliances. Bill MertzThis is GREAT stuff. If you dont know a light bulb used at homes comes in different sizes and they produce a lot of heat, which is why they arent preferred in small lamps; therefore, a miniature version of sixty watts is used to save the light from burning up. Conversion formula: watts = kilowatt hours hours . Because the PV array rarely produces power to its STC capacity, it is common practice and often economically advantageous to size the inverter to be less than the PV array. Use our AC to DC Calculator which is a very easy-to-use and free tool. At that time you would need to recharge the battery to prevent excess discharge. Enter voltage in volts. The question I am asking is beyond my comprehension, so please be patient. Furthermore, the . High-temperature characteristics of SiC module and 100 kW SiC AC-DC converter at a . It will not work for your situation. And also we have all the detailed information like definition, formula, step-by-step process, and solved examples. In the event that the PV array outputs more energy than the inverter can handle, the inverter will reduce the voltage of the electricity and drop the power output. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The key driver here is the "clipping loss": when the. Voltage (V) Load rating (kW, kVA or hp) pf Cable Size Calculator AS/NZS 3008 Maximum Demand Calculator AS/NZS 3000 Arc Flash Calculator IEEE 1584 Full Load Current Calculator Parameters See below: At 100% efficiency ADC Watts out = AC Watts in. Using our kW to Amp calculator, you can convert DC, Single phase and three phase kilo Watts to Ampere Online. i have already purchased a 12v 220v inverter which is rated 1500wattsmy questions aer: what rating of one 12v battery (or a system of combined batteries) do i need to achieve this target.Also , what specification of solar panel charging system can charge the battery in a very short time like 2 hours of sunlightwe do have intense sunlight in my region. I guilt a solar generator with a 100 watt panel, a 12V inverter that puts out 220 VAC and a 12 V battery. Set of 28" Solar Panel Stands / Legs | 4/6/8 Panels | Portable Solar Panel Leg Kit | Fully Adjustable | Compatible w/ EcoFlow, Bluetti, & More! AC Watts You get to AC watts by multiplying the PTC DC wattage by the inverter efficiency. PF I(A) VL-L (V) / 1000. BatteryStuff TechIt depends on the size of your inverter, but 29 AC amps is a lot of energy to pull even for a short about of time. You need to select the type of conversion you want AC or DC. Full Name Should contain only letters, numbers, and (' - .)! The more kWh of electricity you spend, the bigger electricity bill you will have. Thank you ALL for the info. With an oversized inverter you will have more capacity to convert DC to AC, but unless you plan to add more PV at a later date, the oversized inverter would likely be an unnecessary purchase. One of the most common types of electricity conversions that must be performed is the transformation from kW (kilowatts) to Amps. BatteryStuff TechYes, power ratings are usually rated hourly. Actually at the top of the page it does say DC -> AC Converting Power/Watts in DC to Power/Watts in AC? Here is how you can calculate how much does electricity per month costs: Electricity Bill ($) = 886 kWh $0.15/kWh = $132.90/Month. Next I would suggest using our Calculator | Sizing a 12 Volt Battery to a Load, as it depends on how long you want to run that load for. You can take that figure and input it into our Calculator | Sizing a 12 Volt Battery to a Load. Remember, 297 is the AC wattage for one monocrystalline panel. You will just have to determine the AC voltage of your inverter, and it should be the same provided by the grid of your country. Not to be confused with watt-hours, which is a separate unit of measurement. (Basically Dog-people). As you probably already know - watts estimate the size of a solar power system. 90% efficiency rate. kWh, or kilowatt-hours, refers to an appliance's energy in one hour. AC to DC converter is an electric current that converts alternating current to direct current. Heres a chart of DC watts into AC watts conversion with pure sine wave inverter and modified sine wave inverter. Kw to amps is a kilowatts to amps conversion calculator. I apologize for inverting your question, but this was the best explanation for me that I have so far found with my searches online. The chart below actually shows ~4500 operating hours for a standard solar array, with each hour represented as a thin vertical slice. 2023 ShopSolarKits.com. Thank You! Type Inverter Efficiency Rate (e.g 85%. Most solar equipment use an inverter to convert DC Watts to AC watts. It only takes a minute to sign up. (Not to be confused with a converter, which takes AC to a DC.). Converting Power/Watts in DC to Power/Watts in AC? Letter of recommendation contains wrong name of journal, how will this hurt my application? The calculator also provides the wattage rating you are pulling so you can properly size thepower inverter you need! How Does the Calculation Work? So, if the products or machinery you are using asks for 1.5 KW means it requires for 1500 watts and if it is in the form of 0.8 kW then it means it needs 800 watts to run. Once you find the watt amount from the AC volts x amps, you can divide the watts by DC volts to get DC amps, plus 15%. Steve Southeni have a 5000 watt invertor fitted to my nissan patrol ute . For instance: How many DC amps does a 12-volt inverter need to run the same 1,500-watt electric heater? With the number of watts and inverter efficiency rate, convert DC watts to AC watts using the following formula: AC watts = (DC watts multiplied by inverter efficiency rate) / 100, For instance: The rating of the monocrystalline panel we mentioned earlier is 330. Christian Science Monitor: a socially acceptable source among conservative Christians? SamboThanks, this was very helpful, but mainly to give me an idea of the current draw on the batteries so that I can work out what circuit breaker/fuse to get. I am just a person trying to build my own off grid solar that needs a few answers. Price of electricity per kWh. A common source of confusion in designing solar systems is the relationship between the PV modules, inverter(s), and their "nameplate" power ratings. This Kilowatts to Amps calculator to convert power in Kilowatts into current result in Amps, select your current type (DC/AC), insert power in kW and voltage, then press Calculate to get the power result in Amps. There is a formula for converting AC power (watt) to DC power (watt) is (1.5*AC power), what is the origin of this formula? TimWhen talking about current, for example if a device is drawing 3 amps, does that mean 3amps per hour? In most setups you would need a deep cycle battery meant to act as a buffer for the larger amp draws the power-supply isn't capable of outputting. This requires you to convert watts to watt-hours. Does Solar Power System Work at Night or Cloudy Day? If we use an AC to DC adapter/converter to generate 1A,12V (12Watts) DC then What will be the AC Power/Watts that we have to input into the device's adapter/converter? Wattage is the total power, which is comprised of voltage * amperage. It all depends on whether you want to know the Wattage or the Voltage provided by your solar power system. As far as what inverter to purchase You need to account for your surge draw which you state is 13.9 amps 120VAC x 13.9 Amps = 1,668 Watts! How to tell a vertex to have its normal perpendicular to the tangent of its edge? ZukiThis was exactly what I was looking for. But even a larger battery would surely suffer. Knowing your AC needs can guide you to get the correct size wiring for maximum efficiency. He is a passionate Mechanical Engineer that worked in the building and maintaining several solar power systems for houses and organizations during a severe domestic power outage in his country. For example, most of the inverters are 90% efficient so, 100w DC * 90 / 100 = 90w AC With the help of this simple calculation formula, you can easily calculate the DC watts of your battery bank or solar panels into AC watts MOLPRO: is there an analogue of the Gaussian FCHK file? Even though AC watts and DC watts have the same unit (watts) and power is power (it never changes), however, in this case, when converting from DC to AC or vice versa, a power loss will occur, and thats why DC watts are not the same as AC watts. For example a 9 kW DC PV array is rated to have the capacity to produce 9 kW of power at standard testing conditions (STC). Regards Right? Therefore, 150 amps is the total DC a 12-volt inverter requires to operate a 1,500 ac-watt load. AC to DC calculator is the best tool that is available at physicscalculatorpro.com. Calculate your federal solar tax incentive federal solar tax credits differ from state to state. Does converting 12V DC to 110V AC really increase the available watts? So if you know how to do these conversions, youll always get value for your money. DC is equivalent to the average AC value in 90 percent of cases. Usually, its lower than STC ratings. In: Physics Procedia, Vol. You are also correct you won't see any loss if you use the same amount of batteries in your 12v setup as you would in the 24v setup. P = 3 PF I V. The markings are the same here. Then, simplify the problem and get the answer. The STC DC size of this panel system is 5,940 DC Watts (i.e., 330 times 18). Remember you're making this calculator for newbies, so yes I know you can divide watts by 120 (north america) and get the amps, but for newbies, easier if you can enter either. This calculator will tell you what size battery pack you need to create depending on how long you want to run the well for. Chris TsitourisI'm an experienced sales consultant with a demonstrated history of working in the renewables and environment industry. . Of course, you should choose the AC watts quote since DC watts will be lost during the conversion from DC to AC in the inverter. Thanks for the correction. A healthy design will typically have a DC/AC ratio of 1.25. Thus the nameplate rating of the inverter is its capacity to process the power of the PV array. BatteryStuff TechIn reverse it would be a charger vs an inverter, however if the charger runs off 240VAC and draws a 100A then it will put out approximately 552A on a 48V system, but it might vary depending on the efficiency of the charger. kW to Amps conversion calculator is used to calculate amperes from the known power kilowatts in DC, Single, two, or three phase AC circuits. AC three phase amps to kilowatts calculation Calculation with line to line voltage The power P in kilowatts (kW) is equal to square root of 3 times the power factor PF times the phase current I in amps (A), times the line to line RMS voltage VL-L in volts (V) divided by 1000: P(kW) = 3 PF I(A) VL-L (V) / 1000 You have already known the answer if you have read the entire article. How can we convert Watts in DC to Watts in AC? So if I connect 3 12 V batteries in parallel, will that be sufficient to run this pump or should I connect 4 12 V Batteries? Copyright 2023 Dot Watts. ThanosNice tool! In this scenario you get an additional 1hr 41min of run time due to the less amps being drawn out of the higher voltage battery pack. As an Amazon Associate, I earn from qualifying purchases. In this article, we explain why understanding DC and AC watts conversions are crucial and show you how to perform conversion calculations. Jeremy FearThe loss figured is based upon the average efficiency for Pure Sine Wave power inverters. Gives me a better understanding when using AC appS. 5V DC @ 1 A = 5W, same with AC 5VAC @ 1A = 5W As for inverter conversion losses, they vary widely from 60% to 95%, somewhat tracking price, higher price = higher efficiency. JohnIt is hot in Houston. The inverter has the sole purpose of converting the electricity produced by the PV array from DC to AC so that the electricity can be usable at the property. You could place a car audio capacitor inline between the inverter and the amp just like you would on a vehicle. Performance Test Conditions (PTC) rating PTC indicates the actual power a solar panel can produce under specific outdoor conditions. A system rated at 3000 watts (W) will generate 3000 watts (or 3 kilowatts) under ideal conditions. I have a car audio amplifier and subwoofer set up that i can no longer use in my vehicle. AC single phase amps to kilowatts conversion. Following are the steps for kilowatts to amps conversion: Select the current type. AC three phase kilowatts to amps calculation. Watts = Volts x Amps. In the following section, we will see how inverters convert DC to AC. If this is an AC powered device you can input your AC voltage and Amperage into the calculator above to get both your wattage and DC Amps. Is there a power invertor that can plug into a 120 volt outlet and provide the power needed for the amp? 220V AC to 12V DC Car Cigarette Charger Lighter Wall Power Socket Plug Adapter Converter Switch Transformer.. In this way, you will get current in ampere. Formula, A 24-volt inverter requires around five amps of DC input per 100 watts power output used to run an AC load. Look into the formula that converts alternating current to direct current. How Many Watts Can A Charge Controller Handle? Using the same knowledge that we learned in the previous example, we will calculate the total AC power stored in our battery bank. BatteryStuff TechUnfortunately, no. 1997-2023 BatteryStuff.com LLC. A kilowatt is equal to 1,000 watts. I hope this short guide was helpful to you. Rectification efficiency depends on voltage and diodes used. The inverter is the electronic device that converts DC to AC in a two steps process: First of all, it turns DC into AC, then it increases the input voltage (12V, 24V) to reach an output of 230V usable by all appliances. I have a 100A 240V sevvice but need to power a DC rectifier shelf that is capable of 200A. Related Post:How Long To Charge 12v Battery With Solar panel? MsO. This would pull 46.37 Amps DC, so you could run about an hour before you start to excessively discharge the battery. Ogboi Stephensonls I have a DC appliances thats uses -48v and the current in my region is an AC with 200v 220v, how do I get an accurate result? It runs very well with a 1200 watt generator. I suggest contacting your battery distributor and asking for a specification sheet or visiting the manufacturer's website, as they sometimes have them available for download. This extension cord works with any item that . Kilowatt hour is standardized as 1,000-watt hours or 3,600,000 joules. Choose the right-sized system to match your needs. The number of DC watts its always best to use the PTC DC rating because its more or less similar to the power output you'll get from a solar panel. Amps to KW calculator. So there will be apower loss when converting DC into ACwith the help of an inverter. E.g: 5e3, 4e-8, 1.45e12. is the power factor of the load. TECH504 watts / 4.8 Amps = 105 VAC. Solution: Step 1: Write down the formula. This loss in power is known as clipping. The calculator utilizes various formulas to perform the calculations; Alternatively, you can avoid getting scammed by going the DIY route and installing, If youd rather use these values for your calculations, you can check out our. It is important to note that this determines the theoretical DC voltage equivalent based on . Usually you are reading the reverse terminals. If I use this calculator and input 100A AC, 240VAC, 48VDC then the calculator shows 552A DC. Would it require a 220 volt? The electric converter for Europe doesnt require you to work with equations or ask for any manual calculations; all you have to do is throw the number at it for conversion to other units, and you will get your results instantly. Specifically, calculating AC watts will help you to: For more information to help you pick the perfect solar panel system, read our other article on performing watt conversions manually or using a watts law calculator. To calculate the amount an appliance uses in kilowatt hours, take its wattage, multiply it by the number of hours you use it, and divide by 1,000. Often, a batterys capacity is in watt-hours. 1. Microsoft Azure joins Collectives on Stack Overflow. + Calculator, Therell be no power loss in AC wiring (use the chart below to figure out the right size wiring for your inverter). I = DC current V = DC voltage To put it simply, we can get the amps from dividing the kilowatts by voltage and multiply it by 1000. It can either be direct current (DC) or alternating current (AC). For Direct current: The AC to DCConverter tool lets you turn your numbers into other units of energy from any part of the world, and all it asks for is a constant internet connection. HelioScope by Aurora Solar However, I am still interested in repurposing this setup. First, lets find the PTC rating for the solar panels on the specs sheet: As you can see, my solar panel has 273 watts of PTC power. Then Consider Checking: Older Post . for e.g A device needs 1A and 12V DC input i.e (1A x 12V = 12 Watts) 12 Watts DC. We respect your rights to privacy and will not share your email information with anyone ever. AC to DC Calculator: If you are in search of this Ac to DC Calculator? Youll learn how to convert watt-hours to amp hours or convert watt-hours to milliamp hours to cater to all your power needs. As you can see, the electricity bill depends only on two factors: Number of kWh used. PDF | The operational principle of converters from DC into AC electrical powers, so-called inverters, is based on the idea studied in Chapter 3. . The "naive" way never exceed 75%. Find the AC voltage of the power source with a multimeter. So a 7.53 kW system = 7530 Watts and a 250 watt . You can find this information in a products description section, on the bottom side, or its specs sheet. For more information to help you pick the perfect solar panel system, read our other article on performing. Get weekly emailskeeping 80,000+ solar enthusiasts in the loop, for free. Which tool is best for AC to DC converter? STC is 1,000 W/m^2 and 25C, and is more ideal than typical real world conditions. Attach the multimeter leads to the ports on the bottom or side of your multimeter. DaveVery useful. 25o W) *note this is important b/c panels are rated in watts, and the systems are rated in kilowatts (1000 watts). Further on, we also solve examples for 9000 BTU, 18000 BTU, and 24000 BTU. The AC watts would be. RMS Equation for AC to DC Conversion: If we know the peak voltage of an AC, we can quickly figure out the necessary DC voltage. It is a conversion calculator that changes the current in Amps (A) and the voltage in Volts (V) to power in Kilowatts (KW). Enter the known kW and system voltages to find the current through the circuit. However, keep in mind that not all this power is used. kW=150kVA0.2 = 30kW. This paper introduces a new dc-ac converter with the feature that it produces an instantaneous output voltage higher or lower than the input dc voltage without an intermediate power stage or transformers. You would be lucky if a car battery could take that draw for even an hour before excessively discharging the battery. Calculate the charge on each capacitor b. Actual power P, in kilowatts is calculated by multiplying the phase current I in amps (A) by the power factor PF, multiplied by the RMS voltage V, in volts (V), and then dividing the result by 1,000. How to power STM32F103C8T6 in a 'real' project? But most of our household appliances are designed to be run on Alternating current AC (120-240V). All Rights Reserved. For that just fill the kW and Voltage value in the below two boxes and by pressing the calculating button to get the answer in Amps. DC = 0.636 x 160 = 101.76 volts. This will be the watts you will receive at your home sockets. In the end if you want to use a 12v stereo with AC power you will need a Power Supply / Converter Charger to power your equipment. While I appreciate the attempts to answer the question that wasn't asked, I think it's also important to answer the question that was asked, particularly since this question starts with a statement that begs the question! Since our kit has around 18 panels, multiply 297 by 18 to get the AC watts for the entire system. There is a solar article that goes well in depth on these calculations if youre interested in the techie type stuff: Email address should be formatted user@domain.com. Power load and source questions (music controller with led strip load), Choosing external adapter voltage to power Arduino & Relay. still, have any confusion? Scott BellI have a electric motor 220amp. Here's how to calculate its capacity in kilowatt hours: 3500 mAh 3.7 V 1,000,000 = 0.01295 kWh. When you have all the details, you can use the formula (Watts x the hours used in a day) and divide it by thousand. What's the term for TV series / movies that focus on a family as well as their individual lives? JasonCan I use this in reverse? If Im reading 30amps on -48VDC side how much power is my 24VDC bay actually providing? This calculator helps you determine the DC amperage as it passes through a power inverter. Youll be keen to pick the best panels and inverter with a high-efficiency rate to minimize power losses. x I L ) / 1000. Given you are no longer going to have a large amp alternator working as a power-supply you will most likely need an larger battery pack to act as a buffer. Quality NESI-105 KW AC to DC Bidirectional Converter On-grid and Off-grid Type for Energy Storage System for sale, Buy AC DC Converter products from sinyenergy manufacturer. EmmanuelI have a 12v car battery and I also have 240v electric motor. For this you need a DC to AC Power Inverter that takes the DC voltage a battery provides and inverts it to AC voltage so that you can run an AC Powered Device. This calculator helps you determine the DC amperage as it passes through a power inverter. How long can it run using an inverter, a 100 amp hour AGM battery rated at 1200 watts? I also figured out the efficiency of my renogy 3000W inverter. Its 90%: Now using the above calculator and having a total PTC power of 1365 (five panels x 273W), we get a total AC power of 1228.5 watts: Another example could be the DC power stored in your battery bank. The first step to sizing the battery pack when using a DC to AC Power Inverter is to know your DC Amp rating. I would suggest using our Calculator | Sizing a 12 Volt Battery to a Load. Usage of a machine that asks for more eleven hundred watts one hour, you approximately consume one kWh of electricity which can also be defined as one unit. Ohms law is V=I*R, Watts law is W=V*I, where V=voltage, I= current, R= Resistance, W= Wattage. The primary purpose of the Power Converter on our website is to aid you in making all kind of calculations. For these conversions, we recommend using an AC to DC amps calculator. Depending if the motor is an AC or DC motor you would need either inverter or converter to run the motor off of a battery. To get this rating, different solar energy regulatory bodies, like the California Energy Commission (CEC), test various solar panels out in the field. The standard breaker in my house is 15 amp's, with a few at 20. But as voltage goes up or down, in order to have the same power the amps will adjust accordingly. Convert DC . You may consider to: Check the spelling; Use less keywords; Use different keywords; Submit Buying Request,click the button right Alternatively, get accurate efficiency rates on CECs inverter list. A free online electrical power conversion calculator for converting any amount of Ah (ampere-hours) to KWh (kilowatt-hours). Power is power. Now back to our calculator, we get a total AC power of 4320W: Since we had already determined the total AC watts provided by the solar panels or the battery bank, it is easier now to find the total AC current (amps). I'm an experienced Sales Consultant with a demonstrated history of working in the renewables and environment industry. Lets look into detail as to why this is the case. In many cases, a 9 kW DC array of modules with a 7.6 kW AC inverter will produce an equal amount of power to pairing the array with a 10 kW AC inverter. From our calculations, you can confirm power loss occurs during the DC to AC watts conversion process. In this case, I will have a total battery capacity of 9600Wh. Rick NicholsonThis calculator is almost spot on, it would be best if you could choose either to list amps or watts. The torque, however, is normally maintained by regulating the Volts/Hz ratio. PTC refers to the process through which the panels are tested in real-world environmental conditions. How can a car device convert 12V to 220V? But thats a discussion for another day. How do we determine the short time peak current battery can withstand before huge voltage drop ? All the items that you are using at home today come with power mentioned over them. Read honest and unbiased product reviews from our users. Summary: Watts out DC = 75% to 90% of AC Watts in, in most cases. DC amps to kilowatts conversion The power P, in kW is calculated by multiplying the voltage V in volts (V) by the phase current I, in amps (A) and then dividing the result by 1,000. Most customers that intend to use an inverter and dry camp will typically start with a battery pack in the 200+ AH range. DC, AC single-phase, and AC three-phase) Enter power in kilowatts. On the 48 volt side, you are using essentially 1450 watts. So can the 12v battery run the electric motor??? The formula, however, doesnt work quite well against machines that ask for too much power. Typically, watts will be used to describe how powerful your solar array is.
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