The Tesla Powerwall 3 – 13.5kWh Expansion Battery Unit is designed to increase the energy storage capacity of your existing Powerwall 3 system. This DC-coupled lithium-ion battery connects directly to the Powerwall 3 and uses the same inverter, making it a simple and efficient upgrade without additional hardware. Built with an IP67 / NEMA 3R weather-rated enclosure, it can be installed indoors or outdoors and operates reliably in temperatures from –20°C to 50°C (–4°F to 122°F). With the ability to add up to three expansion units per Powerwall 3, homeowners can significantly increase backup power and maximize solar energy usage.
Original price was: $8,500.00.$8,000.00Current price is: $8,000.00.
41 in stock (can be backordered)
41 in stock (can be backordered)
Product details
The Tesla Powerwall 3 – 13.5kWh Expansion Battery Unit is designed to increase the energy storage capacity of your existing Powerwall 3 system. This DC-coupled lithium-ion battery connects directly to the Powerwall 3 and uses the same inverter, making it a simple and efficient upgrade without additional hardware. Built with an IP67 / NEMA 3R weather-rated enclosure, it can be installed indoors or outdoors and operates reliably in temperatures from –20°C to 50°C (–4°F to 122°F). With the ability to add up to three expansion units per Powerwall 3, homeowners can significantly increase backup power and maximize solar energy usage.
| Weight | 350 lbs |
|---|---|
| Dimensions | 45 × 30 × 7 in |
| Battery Capacity | 13.5kWh |
| Battery Type | Lithiumion |
| Operating Temperature | –20°C to 50°C (–4°F to 122°F) |
| Operating Humidity | Up to 100%, condensing |
| Storage Temperature | –20°C to 30°C (–4°F to 86°F), 25% SOE |
| Maximum Elevation | 3000 m (9843 ft) |
| Enclosure Rating | NEMA 3R / IP67 |
| Certifications | UL 1973, UL 9540 |
Description
The Tesla Powerwall 3 13.5kWh Expansion Battery Unit is a powerful energy storage upgrade designed to expand the capacity of an existing Tesla Powerwall 3 home battery system. Built with advanced lithium-ion battery technology, this expansion unit allows homeowners to store more solar energy and extend backup power during grid outages, helping you achieve greater energy independence and reliability.
This DC-coupled expansion battery connects directly to the main Powerwall 3 system and uses the existing inverter, eliminating the need for additional inverter hardware. With a simple plug-and-play connection using the Tesla Expansion Harness, installation is streamlined and efficient for certified installers.
Engineered for durability and performance, the Powerwall 3 expansion battery features an IP67 and NEMA 3R weather-rated enclosure, making it suitable for both indoor and outdoor installation. It operates reliably in extreme environments with an operating temperature range from –20°C to 50°C (–4°F to 122°F), ensuring consistent performance in harsh climates.
Homeowners can connect up to three expansion batteries to a single Powerwall 3, significantly increasing total energy storage capacity to support larger homes, higher energy usage, or extended backup during outages. This scalable system makes it easier to optimize solar energy usage, reduce reliance on the grid, and lower long-term electricity costs.
Backed by a 10-year limited residential warranty from Tesla, the Powerwall 3 Expansion Battery delivers trusted performance, long-term durability, and seamless integration with Tesla’s advanced home energy ecosystem.
Key Features
- 13.5kWh Capacity: Adds extra storage for solar self-consumption or emergency backup.
- Broad Compatibility: Works exclusively with Powerwall 3 (model 1707000-xx-J or later).
- Sturdy Construction: IP67-rated for indoor/outdoor use, resistant to temperatures –20°C to 50°C.
- Expandable System: Up to 3 expansion units per Powerwall 3, for a total of 94.5kWh.
- 10-Year Guarantee: Maintains at least 70% performance after a decade.
- All-Black NEMA 3R Enclosure: Stylish and weatherproof for any installation.
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