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2. Tesla Powerwall - Wikipedia

   en.wikipedia.org/wiki/Tesla_Powerwall

   The Powerwall 1 battery uses nickel-manganese-cobalt chemistry [31] and can be cycled 5,000 times before warranty expiration. [ 31 ] [ 32 ] The Powerwall has a 92.5% round-trip efficiency when charged or discharged by a 400–450 V system at 2 kW with a temperature of 77 °F (25 °C) when the product is brand new. [ 14 ]

3. Engine–generator - Wikipedia

   en.wikipedia.org/wiki/Engine–generator

   This is a 100 kVA set. The mid-size stationary engine–generator pictured here is a 100 kVA set which produces 415 V at around 110 A. It is powered by a 6.7-liter turbocharged Perkins Phaser 1000 Series engine, and consumes approximately 27 liters of fuel an hour, on a 400-liter tank.

4. Vehicle-to-grid - Wikipedia

   en.wikipedia.org/wiki/Vehicle-to-grid

   Efficiency depends on factors like charge rate, charge state, battery state of health, and temperature. [34] [35] Most energy losses are from system components other than the battery, particularly power electronics such as inverters. [36] One study found round-trip efficiency for V2G systems in the range of 53% to 62%. [37]

5. Battery electric vehicle - Wikipedia

   en.wikipedia.org/wiki/Battery_electric_vehicle

   A battery electric vehicle (BEV), pure electric vehicle, only-electric vehicle, fully electric vehicle or all-electric vehicle is a type of electric vehicle (EV) that uses electrical energy exclusively from an on-board battery pack to power one or more electric traction motors, on which the vehicle solely relies for propulsion.

6. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threa­ded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.

7. Flywheel energy storage - Wikipedia

   en.wikipedia.org/wiki/Flywheel_energy_storage

   NASA G2 flywheel. Flywheel energy storage (FES) works by accelerating a rotor to a very high speed and maintaining the energy in the system as rotational energy.When energy is extracted from the system, the flywheel's rotational speed is reduced as a consequence of the principle of conservation of energy; adding energy to the system correspondingly results in an increase in the speed of the ...