Slow chargers tend to be found in homes and offices, where a car can be left on charge overnight or during the working day. This will charge a car in 4-5 hours from empty or 1-3 hours for most uses and freeing up more time for others to use it. When we compared the cost of charging a Nissan Leaf at home to the average cost of fuelling equivalent-sized petrol and diesel cars over 9,000 miles, we found the Leaf was £471 cheaper than an equivalent diesel car - and £559 cheaper than an equivalent petrol car.. Most are 3kW, but some lamp-post installations will charge at 6kW. How many watts does a battery charger use… Take this one, for example: "EV heaven; House with 3-phase 40amp Tesla charger (3-4 hrs empty-full), 20 amp built in J1772 charger and 2 standard 10amp GPO's. You should dial it down to 80% of what the wiring and fuse or breaker are rated for (you can only draw 80% continuous load). You also can’t use more than 50% of your power for charging at home because you have other appliances which are also using the power supply, so you could not charge your car at 100kW with your home power supply. Does this give you a ballpark figure? If you up your circuit to a 20 amp breaker the EVSE will still only allow the car to draw 12, so your car won't charge any faster with a 20 amp breaker than it will with a 15 amp one. Battery chargers have a primary purpose of giving energy to a rechargeable battery or a secondary cell by means of an electric current driven through the item. Publicly accessible ‘fast charger’ or ‘super charger’ outlets provide power to the battery at a faster rate. 0 That's why we fall in love with the feel of electric drive, and get that "EV grin". Most commercial chargepoint use this method, as do most 'street' chargers. Many newer cars have proximity keys, ... A car battery charger is a valuable component of any vehicle emergency kit. It is pretty difficult to tell you, because a small trickle charger might use something in the area of 150 Watts while the larger bench type chargers might use 10 times that. Power Current Voltage; 5 Watts: 0.4167 Amps: 12 Volts: 10 Watts: 0.8333 Amps: 12 Volts: 15 Watts: 1.25 Amps: 12 Volts How many watts does a battery charger use. Depends on the charger, and the charge rate. But if there's a short in the line somewhere and your EVSE starts to draw 18 amps your breaker won't blow if you've gone to a 20. As @jerryk said, it could be the GFI protection tripped which would indicate that the GFI outlet might need to be replaced although it could related to wiring because Tesla does not use the ground when charging. Battery chargers differ when it comes to functions and sizes. Most electric vehicles charging at home on a 240-volt level 2 charger will draw about 7,200 watts or less. There's a supportive EV community vibe about many of the point descriptions on PlugShare. A full sized floor charger could draw as much as 25 amps. To charge a typical car battery, you need a 12V charger, but many car battery chargers have 6, 12 and even 24V modes. An alternator charges the battery and supplies sufficient power to all the electric systems. The most common power delivery for level 2 home charging stations is between 30 amps and 40 amps. To charge an EV to 80% at a public rapid charger (the level you normally would here) it costs around £7 to £10. Current North-America vehicles are limited to 48 amps. In terms of amperage, car battery chargers typically put out anywhere between 1 and 50 amps for the charging mode. Funky … Think of an electric drill, and all the torque it delivers when you first pull the trigger! Fast charging is defined as 7-22kW charging, able to fully recharge most models in 3-4 hours. Vehicles with 3-phase charging such as Europe, are unchanged. 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