Tesla Powerwall

Tesla revolutionized the energy storage industry by introducing the powerwall. The powerwall is a rechargeable lithium ion battery that has the capability of storing energy better than other storage options. Even though Tesla started development as early as 2012, installing prototypes at selected industrial customer, the powerwall was originally announced on 30th April 2015 on a special product launch. A the launch pad, the powerwall had a power output of 2kW steady and 3.3 kW. However, Elon Musk, Tesla’s CEO stated that the power output would be doubled without any variation in the price. This came as a good news for all Tesla customers. He also announced that Powerwall deliveries would be prioritized to partners who minimize the cost to the end user, with a Powerwall installation price of US$500. Additionally, he promised not to start patent infringement lawsuits against anyone who, in good faith, used Tesla’s technology for Powerwalls

The powerwall is a very popular energy storage device in the residential sector. Providing the customers with options to store electricity for solar self-consumption, time of use load shifting, backup power, and off-the-grid use, it has proved that Tesla indeed has made a breakthrough in the field. The Powerwall is optimized for daily cycling, such as for load shifting. Tesla uses proprietary technology for packaging and cooling the cells in packs with liquid coolant.

Back in the initial launching stage of the powerwall, there were two models commercially available. One has a 10 kWh capacity that is mainly used for backup purposes. The other, though has a lesser capacity of 7kWh is intended to be used for daily cycle applications. However, after only a year, Tesla removed the 10 kWh battery option. This battery had a nickel cobalt aluminum cathode and had a projected cycle life of 1000 to 1500 cycles.

However the smaller 7 kWh battery utilizes a nickel-manganese-cobalt cathode. It comes with a warranty of 5000 cycles. The battery was tested by charging it by a 400-415 V system operating at 2 kW. By the end of the test, the battery displayed an efficiency of 92.5%. This test was considered slightly rigged, since it was performed on a brand new product. Temperature variations and charging rate variations cause the efficiency to be decreased over time.

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