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The Powerwall was introduced in 2015 as Powerwall 1 with limited production. A larger model—Powerwall 2—went into mass production in early 2017 at Tesla's Giga Nevada factory, with a more capable model with an internal DC–to–AC inverter—Powerwall 3—entering production in late 2023. As of May 2021, Tesla had installed 200,000 Powerwalls.
In September 2016, Tesla priced the Powerpack at $445/kWh, and a system with 200 kWh of energy and 100 kW of peak power was the cheapest available priced at $145,100. A bi-directional 250 kW inverter costs $52,500. [21] By October 2016, a limited system of Powerpack 2 cost $398/kWh. [11] A 22 MWh system can cost €15 million. [22]
Distributed energy resource (DER) systems are small-scale power generation or storage technologies (typically in the range of 1 kW to 10,000 kW) [25] used to provide an alternative to or an enhancement of the traditional electric power system. DER systems typically are characterized by high initial capital costs per kilowatt. [26]
A 10 or 20 year "performance guarantee" is available for an additional cost. [15] Once a Megapack has reached the end of its useful life, Tesla says they can be returned for recycling. [16] Megapacks are pre-assembled, including "battery modules, bi-directional inverters, a thermal management system, an AC main breaker and controls." [17]
Like the Powerwall and Tesla's cars, the solar inverter is capable of receiving over-the-air updates through built-in cellular connectivity. The product has been noted for using older string inverter technology (many systems now use micro-inverters), but that it has the potential to drive the cost of Tesla's solar systems even lower. [65]
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