Tesla Powerwall: Everything that you need to know

Tesla Powerwall is a rechargeable lithium-ion battery manufactured by Tesla, Inc for households. Powerwall is a completely automated home energy storage product that can detect grid outage and power the house when needed.

Tesla Powerwall
Tesla Powerwall

When integrated with home solar power generators Powerwall can store excess energy generated during the day and make it available for use when needed, thus reducing the home’s reliance on utility. Apart from being a backup power supply, Powerwall can also perform load shifting, storing energy when electricity prices are low and supplying energy when electricity charges are high.

Powerwall: Specifications

Tesla Powerwall: Dimensions
Tesla Powerwall: Dimensions
AC Volatage (Nominal)120/240V
Capacity13.5 kWh
Depth of Discharge100%
Efficiency90% round-trip
Power7kW peak / 5kW continuous
DimensionsL x W x D: 45.3″ x 29.7″ x 6.1″(1150 mm x 755 mm x 155 mm)
Weight276 lbs / 125 kg
Internet ConnectionRequired
Optimum Temperature0°C to 30°C (32°F to 86°F)
Operating Temperature–20°C to 50°C (–4°F to 122°F)
Maximum Elevation 3000 m (9843 ft) 
ScalableUp to 10 Powerwalls
Mounting OptionsFloor or wall mount
Supported ApplicationsSolar self-consumption, Back-up power, Time-Based control
Warranty10 years (Unlimited cycles)

Download Powerwall specifications sheet

Powerwall: History

Tesla CEO Elon Musk announced the development of the company’s battery storage products Powerwall, for residential users and Powerpack, for commercial customers in April 2012.

Both products were officially launched three years later on April 30, 2015. Tesla launched two models, 10 kWh capacity Powerwall for $3,500 and 7 kWh capacity Powerwall for $3,000.

In October 2016, Tesla unveiled its second generation residentail battery, Powerwall 2. The company also announced that it has installed 300 MWh of Tesla batteries in 18 countries.

Powerwall: Key Functions

Backup: “In the event of a utility power outage, the Backup Gateway immediately disconnects the home electrical system from the utility and restores power to the home”

Self Power Mode: “Powerwall charges from the excess solar energy generated during the day, and discharges to power your home at night.”

Time based Control: Forecasts energy consumption to optimize Powerwall operation. “The energy forecast learns the patterns of your home energy use and seasonal solar production to maximize the value of your energy. If you are forecast to buy high-cost energy, Powerwall prioritizes charging during low-cost times and discharging during high-cost times.”

How Much does a Tesla Powerwall Cost?

In October 2018, Tesla increased Powerwall price from $5,900 to $6,700. Backup Gateway, supporting hardware that controls Powerwall’s connection to the grid costs $1,100. Other installation related cost ranges from $1,000 to $3,000.

Total Equipment cost for installing two Powerwalls in a US home is $14,500.

Tesla Powerwall Lifespan:

Tesla provides unlimited cycle, ten-year warranty for the current generation of Powerwall (Powerwall 2), which means your product is covered for ten years irrespective of the number of times your charge and discharge the Powerwall.

Tesla also guarantees that Powerwall 2 will retain at least 70% if capacity during the warranty period.

Download Tesla Powerwall Limited Warranty USA

Powerwall 2: Battery Capacity

The current generation Powerwall (Powerwall 2) has 13.5 kilowatt-hours of storage capacity, which is more than twice the capacity of the earlier version (Powerwall 1) that had a capacity of 6.4 kilowatt-hours.

According to EIA, in 2017 the average annual electricity consumption for a U.S. residential utility customer was 10,399 kilowatt-hours (kWh), an average of 867 kWh per month. 

Since the average electricity consumption per household is more than 13.5 kWh, a typical US household will need two Powerwalls to power their home for a full 24 hours.

How to buy and install Powerwall?

  • Pay Tesla $500 deposit fee.

  • Once the fee is paid, Tesla specialist will contact you to discuss the installation and project requirements

  • A complete home assessment must be done through a web-based self-survey or you can request Tesla to send a site surveyor

  • Review and approve your design

  • Tesla or a Tesla Certified technician installs the Powerwall.