If you are using a different voltage battery the amp-hours will change by dividing it by the battery voltage you are using. If youre the type who just isnt satisfied with the overview, heres a deeper dive into the topic. When my Tesla s is charging it reads 12W 16/16A 240 V (3 phase) Again we use the same calculation dividing power in watts by the voltage in volts to find amps. There are a number of reasons for that- snow tires [mean]more loss to friction, my wife runs the heater at 78 degrees and uses the heated seats, batteries are just less efficient with cold. Amps = Watts / Volts. I also suspect that the efficiency could be different for level 1 and 2 chargers. I assume Boost mode is intermitent use for starting, so it may be OK. I want to calculate the cost efficiency of this car verses a traditional all gas car. The important elements of a home system are the PEV charging unit, officially called an EVSE; its amperage, and the capacity of the plug-in vehicles on-board charger, usually given in kilowatts, or kW. And the hose is limited by the pressure of water. A Level 2 charger rated at 16 amps will only deliver 3.8 kilowatts per hour, even if the car is able to accept 7.4 kW each hour. Solar panels are commonly used to charge a battery not to charge a device directly. As an exampke the CTek MXS-15 at maximum charging output will draw 1.8 amps . This means that when charging the example battery with a 10 amp charger, it will take 3.6 hours to fully charge. A home EVSE that uses a 110-volt supply is called a Level 1 device. To select an inverter from DonRowe.com that has enough power for your application, add the watts for items you may want to run at the same time. I would love to help the environment as well. To size a battery bank we take the hours needed continuously x watts = total watts/DC volts=amps needed. We get better than EPA at 47mpg. Thought i would tell you about our 2018 Clarity phev and my calculationsI live in northeastern Washington state. News Nominal Voltage X Amp Hours = Watt Hours. That way so you dont have to keep replacing it every time you get a new/faster-charging EV!!! Using a 5 amp 12 volt charger, we have 10 amp hours/(.9x5) amps = 2.22 hour recharge time estimate. Find the electric charge in Amps when the energy consumption is 300 watts and the voltage is 240 volts. Example. For example, a 100 amp hour battery with a 10 % discharge would need 10 amps replaced. Any idea about the efficiency of charging a clarity plug-in hybrid? My salesman knows less than me at this point and I am an elderly lady trying to stretch my pennies. Hope this helps. But if your EVSEs capacity is less than that of the cars charger, the car wont charge as fast as the manufacturer says it should. Well also assume that were good with the rule of thumb of 30 amp-hours per day from a 100 watt panel. With a larger battery such as yours we would recommend a marine 12v 10 amp charger such as the NOCO Genius 12v 10 Amp Marine On-Board Battery Charger, or a USA made Dual Pro 12v 10 Amp Sportsman Series On-Board Charger.Our preference would be the USA made charger How many batteries do I need for my inverter? (Note ..this comment was edited for length and clarity no pun intended), A quick question please Better use a 10ga cord. End of Story. I know quite a bit more now but have a very basic question. A 40 amp EVSE will need a 50-amp breaker and an 80-amp unit will require a 100-amp breaker. While battery-electric vehicles (BEVs) have stepped up their charging game, most plug-in hybrids still use 3.3 kW chargers because they have much smaller batteries, often less than a third the size of a BEVs. This is because the panel can experience more current than what it is rated for when exposure to sun rays is above 1000 Watts/m^2 or tilted. The 16 amp circuit you apparently have for the charger you use will fill the battery, so in that sense it is appropriate, but it takes much longer to do so than with a 40-amp circuit. This article can help you understand the conversation when plug-in vehicle (PEV) enthusiasts are going on and on about their fuel efficiency and charging tricks. Building codes require that the wiring circuit that supplies the electricity be rated higher than the EVSE, to account for losses that occur as the power flows through it and into the vehicle. For example, five 100 watt panels in parallel would be 5.29 x 5 = 26.45 Amps. Watts represent energy per unit of time. If my recent charging on a metered charger is correct, usable battery capacity is much lower [than the online reports] and the electricity cost for us is about 60% of what I reported 9 [about $105]. If you drain the battery, youll be using close to 17 kwh to recharge it; if you only drive 23 miles a day, youll be using about 8 kwh to rechargeetc. The converter battery charger is designed to keep the house batteries topped off with this trickle charge. These three concepts tie together in this formula defining charge: Watts = Amps x Volts. It wouldnt be very efficient. That will allow you to keep the same home charging station if (or when) you later step up to a new PEV with a larger capacity on-board charger than the model it replaces. So the electric miles also effectively reduce the cost of gasoline by improving your overall fuel efficiency. As energy E is power P multiplied by time T, all we have to do to find the energy stored in a battery is to multiply both sides of the equation by time:. The combination of Voltage and Ah is how you measure the gas tank in any battery-charged tool. You dont say where you live, so I dont know what you pay for electricity, but lets use fairly high numbers and for purposes of illustration say your utility uses time of day charging, with electricity billed at 30 cents/kwh at peak demand periods, 20 cents per hour off-peak (early mornings, evenings) and 12 cents for overnight (midnight t 6 am). Reply Abcdefg Do not use this large of a charger for car batteries. In plug-in vehicle charging, the pressure that pushes the electrical current through the EVSE hose is measured in volts. Charging an EV at 40 A (9.6 kW) means it will take a little more than one hour to charge to the minimum required daily amount, compared to 1 hour and 20 (Calculation is done taking out the 57 miles of electricElectricity in our area is very cheap and clean and I pay 8.75 cents per kw. About 83% [of it on] electricity. What is running watts of 30 amp 12 volt charger? Total electricity cost is about $175. 40 amp-hours per day = 30 amp-hours per panel per day * X panels. [img]tongue.gif[/img] Some have special rate systems for electric vehicle charging, most dont. A 300 amp-hour camper battery, for instance, would need around 300 watts of solar power. 80-85% efficiency; for 120-volt (household) current in the U.S.that could be down to 70 percent efficiency. Watts = Volts * Amps How do we use it? That means they could only accept a maximum of 3.3 kilowatts of electricity each hour they were connected to a 240-volt, or Level 2, power supply. Does having more amps make the charging fo faster? The 2015 i3 has 18.8 kWh of usable capacity. Those 3.3 kW chargers in the early EVs werent all that quick, so manufacturers soon started using 6.6 kW chargers and since the late 2010s, many new EVs have had 7.6 kW charging capacity. The 200AH battery can feed 200 Amps for 1 hour, or 100 Amps for 2 hours, or 10 amp for 20 hours. Contact Possibly a dumb question but have to ask as just getting into this space. You can personalize the calculations and it looks like they are fairly accurate. Total gas plus electricity cost is $292. Thanks. In our example, if we use a 10 amp charger to replenish the needed 36 amp hours, we could simply divide 36 by 10, which yield a result of 3.6. A watt is the basic unit of electricity, and a kilowatt is 1,000 watts. P = V * I. Math time! So, for example, a phone charger delivering 5 Watts = 5 Volts x 1000 mA. Im confused. Hi, I strolled into my local Honda car showroom today and became suddenly enamored with the hybrid Clarity car after seeing the mpg statistics. My Clarity phev was delivered at the start of June. How Many Watts Does a Phone Charger Use? Since watts = amps * volts divide the watt hours by the voltage of the battery to get amp-hours of battery storage. If the charger is providing 30A at 12V, P = V x I so 12V x 30A = 360W. Where to Find Alternative Fuels Example: 3 hours of run time needed * 1500 watts = 4500 watts total / 12 volts DC = 375 amps. Diane The Clarity plug-in hybrid has a 17 kilowatt-hour battery. Six months at 57mi/charge and 6 months at 39/charge comes out to an average of 48. Additionally, on days when you drive more than 40 miles (per the example), you will also be using gasoline, but remember than the first 40 miles is all-electric and cost just $2.04. Reviews A 240-volt Level 2 EVSE rated at 30 amps will deliver 7.2 kilowatts (240 x 30/1000). Hope this helps. In this manner, how many solar panels does it take to charge a 100ah battery? Think of it this way charging at 16 amps vs 40 amps is like trying to fill your pool from a 1-inch hose verses a 2.5-inch hose. You can ask your electricity provider for an explanation of exactly how it charges you, or you might be able to find out simply by looking at your itemized monthly bill providing you get a monthly bill that is itemized. So I cant help with some of this. Electric Vehicle Battery Size (kWh) Charging Station Power of 7,2kW Charging Time with 30A @ 240V (Hour) 40 6.1 6.1 6.1 Smart Car It will charge in about 3 hours with a 30 amp Level 2 EVSE, vs 6 hours with a 16-amp station. Charge at a rate up to 20 percent to 40 percent of the batteries capacity in amp hours to a voltage of about 14.6 volts (gel: 14.1 volts). To support 150 amp hours of battery power, 300 amps of battery capacity should be used for maximum battery life and performance. 300 Watts / 240 volts = 1.25 Amps Do I need a battery? Im sure that it is not 100% so that it would take more than 15 kWh of house current to increase the battery charge by 15 kWhs. If I am understanding the numbers in the first part of your query, then I believe that the Tesla video screen reading of 40/40 you saw likely refers to the best amperage for a 240-volt Tesla home charger: 40 amps. So in actual money per charge, how much am I paying for those 47 miles. Because of the power acceptance limit of some electric cars, it's possible that a charging station with 40A doesn't allow you to charge faster than a standard 30A charger. Accordingly, how many watts does a 20 amp battery charger use? Electricity is typically billed by your utility company on a price per kilowatt-hour (kwh) basis. All About Hydrogen It is always better to get the highest amp charging station also called an EVSE that you can. That volume is measured in amperage or amps. (You wont need an 80-amp model unless you are going to get a twin-charger Tesla one of these days. Volts X Amps = Watts My numbers say a 30amp breaker at 115v, and that is running the very edge. So when you are charging a battery at 2 amps then it takes 24 hours for the battery to receive 48 amps of charge. I dont have figures for the Clarity specifically, but from my own 3 years of metering charging for our 2011 Leaf, plus experience of others Ive talked to about this, it appears that a decent rule of thumb for line losses and other parasitic consumption of power on 240 volt charging systems is about 15-20%, for approx. There are a couple of reasons for having batteries. If you set your Clarity to charge from midnight to 6, you will pay 12 cents per kwh under this example. A typical charger will pull less than one amp with te flexvolt models approaching 2 amps on startup charge. Thank you for all the helpful info thus farfascinating! Mazda MX-30: Finally A Mazda EV But is it Enough. 26.45 Amps x 1.25 = 33 amps and would be too much for the controller. Some newer phones can also use this higher wattage to charge faster as well (you can usually find the maximum wattage of your device by looking at the INPUT value on the device or in its manual). Until October, we were getting 57 miles per charge consistently. Buy the largest capacity EVSE you can afford. This varies with different models. The 16 amp circuit you apparently have for the charger you use will fill the battery, so in that sense it is appropriate, but it takes much longer to do so than with a 40-amp circuit. Used about 36 gallons gas. A higher charger amperage (A) will allow you to charge faster only if your electric car can take the power delivered by the charging station. So you need 1200 / 250 = 4.8 hours of bright sunlight. As an example weve all run into, when buying light bulbs, a 100W light bulb means that the light bulb will last for 100 Watt hours. You likely wont ever drain it completely, but for computation purposes well use that figure. I would estimate efficiency at 75%, because these chargers do make some heat. If you want a better estimatefollow the link to the epas website: https://www.fueleconomy.gov/feg/Find.do?action=phev1Prompt. Using the formula watts = volts x amps , this charger will require 432 watts . Also keep in mind that solar panels experience a 75-90% drop in efficiency on cloudy days, so it's good to have slightly more than you need when it comes to solar power (about a 20% cushion, if possible, to account for less-than-ideal conditions). Thanks for asking yes, the lower the amperage the slower the charge. If a 40V trimmer has a 2.5 Ah battery, the gas tank is 100 I wish I were an electrical engineer, but Im not not even an electrician, just a journalist. Now we plug them in. How many solar panels does it take to charge a 100ah battery? If you get 40 mpg average in regular hybrid mode, youd have to drive 80 miles to use one gallon (80 mpg), 120 miles to use 2 gallons (60 mpg),160 miles for 3 gallons (53.3 mpg),etc. Use the total wattage, plus 20%, as your minimum power requirement. While a wider bottle neck can take in more water, it is limited by the volume of water being delivered through the hose. A PEV charging station that could send only 1 kilowatt of electricity to the battery pack in an hour would be a 1 kilowatt (kW) device. Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122.5 amp-hours. Tablets have larger batteries, so they can use up to 12 watts (5 volts X 2.4 amps) to charge faster. The moral? So, for example: If a 20V trimmer has a 1.5 Ah battery, the gas tank is 30 watt hours. Some, for those Teslas with twin chargers for instance, go as high as 80 amps. Watts in = watts out - efficency. The basic charging capacity of a Tesla, for instance, is 10 kWh, and buyers can order a second on-board charger that double the charging speed to 20 kWh. It started to drop as the weather got colder. If youd like more info, send me your contact info at jo@thegreencarguy.com. When a battery charger says it is charging at 2 amps or 10 amps it is describing the number of amps it is delivering to the battery per hour. A 30-amp EVSE will deliver juice to the car approximately 2x as fast as will a 16-amp. Divide both sides by 30 and you need 1.33 100 watt solar panels. For example, a 200 amp-hour battery would be charged at 40 The bigger difference maker is the size of your smartphone battery, but even the difference between a 1,440 mAh battery and a 2,716 mAh battery comes out to about a quarter per year. A single solar panel of 280 watts will do the work for you. Basic Level 2 EVSEs start at 16 amps, though most professional installers will recommend a larger 30- or 40-amp system. What is a Hybrid? The first battery-electric vehicles, back in the dark ages of 2010 and 2011, were equipped with chargers rated at 3.3 kW. EVSEs will work with chargers that have less capacity than the EVSE is rated for part of the EVSEs job is to determine how much current to actually send through. Some homes with very small or heavily used electric service capacity might need to have the service upgraded to handle an EVSE. Think of it this way charging at 16 amps vs 40 amps is like trying to fill your pool from a That car gets about 47 miles per charge before switching to gas power(I think thats correct). If your laptop adapter is 19V 2.37 amps (=45watts) and the replacement adapter is 19V 2.1 amps (= 40 watts) is it still safe to use the replacement adapter? As for the power equation P=IV, thats one I cant help with. In one hour, that will send 7.2 kW of electricity to a plug-in vehicle, so it will be fine to service cars with on-board chargers rated at 7.4 kW or less. The next table will let you find out which amperage you should choose for your electric vehicle. A 240-volt Level 2 EVSE rated at 30 amps will deliver 7.2 kilowatts (240 x 30/1000). However, if the battery has a 1-ohm resistance, users would require an 11-volt charger, which means users will have to provide 110 watts of power in order to acquire 100 watts to the battery. A 40 amp charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in about 45 minutes, a mid-sized battery (315-550 CCA or RC 60-85) in 1 hour, or a large battery (550-1,000 CCA or RC 85-190) in 1.5 hours. 24-Volt DC Systems Formula: 24-volt inverters require approximately 5 amps DC input for each 100 watts output power used to operate an AC load. After my 7500 mile service the range has dropped to 39 miles. In one hour, that will send 7.2 kWh of electricity to a plug-in vehicle, so it will be fine to service cars with on-board chargers rated at 7.2 kw or less. RV converters do provide a charge to your RV house batteries, but only a small portion of the converters amperage rating is used for this. Perhaps your sources could shed some light on this often neglected topic. A higher charger amperage (A) will allow you to charge faster only if your electric car can take the power delivered by the charging station. Some high-end models go even higher. Now that you know how much amp hours you need, you just need to find out the type of charger. How Many Watts Do You Need? The national average for electricity is just under 11 cents per kwh, and in many areas overnight charging is far less than the 12 cents/kwh I used in the example. If you are getting just 40 miles of range it is difficult to get the exact 47 miles of range that the EPA estimates and Honda advertises (speed, weather, hills, cargo loads, heater and air conditioner use all affect electric range and usually diminish it somewhat) thats 5 cents a mile. [Estimated Reading Time: 4 minutes, 20 seconds.]. Subscribe to charging stations promotions, Check out our other guides and resources on home charging. Hi. We know the voltage of the battery and we know that C for the pack is 2.2A, so that makes the 1C charge rate 2.2A. That all being said- the EPA estimate seems right. The maximum current requirement is on the bottom of the charger. Would it make any difference if I buy a level 2 charger that is 16 amps vs one that is 30+ amps? Some utilities have a flat rate, other charge in usage tiers (the more you use, the more you pay) and others use time of day (cheapest rate, usually, is for overnight, most expensive is during daytime hours of 8 or 9 am to 5 pm or so) and some use combinations of these methods. Power Current Voltage; 5 Watts: 0.4167 Amps: 12 Volts: 10 Watts: 0.8333 Amps: 12 Volts: 15 Watts: 1.25 Amps: 12 Volts BatteryStuff Tech Ideal charging amperage for both the charger and the battery is about 10% of the batterys Amp/Hr rating. Ive been reading this entire mass of info with diligence for a couple hours now and trying to understand it as I go along. The wattage the charger will consume from the wall socket will be higher. While the charger on the car is rated by the speed at which it can push electricity from the home devices connector nozzle through to the battery pack, the EVSE itself is rated for the maximum flow of current it can deliver. Better yet, it will help you learn to accurately compute the home electricity consumption and charging speed should you decide to buy that PEV youve been thinking about. Battery capacity formula. With a 17 kwh battery, that will cost you $2.04. Think of the EVSE and its charging cord as a hose and the charger on the car as the opening in the neck of a bottle. The professional installing your 30-amp system typically will wire the circuit from the home power service to handle 40 amps and will install a 40-amp circuit breaker. ), The basics of home charging are explained in Plug-In Vehicle Charging What You Need to Know.. Thank you! Hi I just had a 50 amp 14-50p outlet setup in my garage and I have a 2015 bmw i3 . They dont need the faster chargers and buyers dont need the extra cost theyd add to the car. Sorry. The 10 watts that remain turns into wasted heat. You will need a total of 375 [] Base melbourne Australia The equation above simply means that your 12-Volt battery will be able to deliver 240 Watts of power for an hour, 120 Watts for two hours.It may also mean that your battery can provide 2 Watts of power for 120 hours.It depends on how much power you are using, the more power you use, the faster your battery Also how does the formula P=I x V apply with my numbers ? Im not an electrical engineer or even a decent electrician, but as I understand things, losses can vary depending on amperage of charging system, quality of EVSE charging cord and numerous other variables. In the U.S., normal household current is nominally 120 volts and it can vary a bit depending on all sorts of factors. $2.04 for 40 miles is probably less than youll pay for each gallon of gas it takes to get the 42 mpg combined fuel efficiency the EPA rates the Clarity PHEV at when it is running in standard hybrid mode after the battery charge has been used up. Compared to driving our former Camry, we have saved $700 in 5 monthsMy above figures are based on what people online report as usable battery capacity. The bottom line: smartphones run on pocket change. Double the times if 100% discharged. On long trips when we have to use the hybrid, we do the highway driving on gas and in town/last few miles on battery. Plug-In Vehicle Incentives, What is a Fuel Cell Car? Diane. PEV Charging, Plug-In Vehicle Charging What You Need to Know, Honda Launching New Alternative Fuel Line, Nissan Rescues Ailing PHEV Maker Mitsubishi, https://www.fueleconomy.gov/feg/Find.do?action=phev1Prompt, 2023 Lyriq: Caddys 300-Mile Electric SUV, EV News: Intros from Audi, Genesis, Toyota. How many watts does that require? Charging your battery at 12 volts and 20 amps will take five hours to charge a 100 amp hour battery. I have seen on videos that 40/40 is on the Teslas screen. To compute how much juice will be delivered to your plug-in vehicle through any properly installed EVSE, multiply the amps by the volts and divide by 1,000. How can I calculate the actual cost of power from my home outlet per charge? We have driven 8172 miles. As long as the cars charge can accept the higher flow (and an i3 will the 2015 is rated at 7.4 kW on a 32 amp level-2 charger), youll be able to charge faster. But for BEVs, greater charging speed means less time tethered to a plug and more time on the road. Equivalent wattage and amperage values at 12 volts. Normally 3 to 5 amps, which are not nearly enough to charge batteries that are discharged. Continuing with our previous example, well assume we use 40 amp-hours per day of battery capacity. Recharge time can be approximated by dividing the amp hours to be replaced by 90% of the rated output of the charger. As it turns out I learn best by example so here comes some examples. Say you want to charge a 2200mAh 3s pack at 1C. For comparative purposes, it's best to use the C-20 rating, which is further defined like this: For a fully charged 12-volt battery, a specification that reads 100 Ah at a 20-hr rate means that the battery can theoretically deliver 5 amps of electrical current for 20 hours before reaching a minimum voltage level of Note: The wattage's given below are estimates. When the Tesla charger was installed I was told that was appropriate. As you might remember from our article on Ohm's law, the power P of an electrical device is equal to voltage V multiplied by current I:. In the last paragraph the sentence But the largest capacity EVSE you can afford. should say Buy the largest capacity EVSE you can afford., About I will give you one great example to end this story of how ebike math could possibly When you find your rate(s), just multiply 17 by the price youll be paying per kwh at the time youll be charging and youll have a cost. Understanding PEV charging isnt that difficult, but it does involve a language electrical that is foreign to most people.
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