Click for reviews
Powerwall 3 Expansion Specifications
| Model | 1807000-xx-y |
| Nominal Battery Energy | 13.5 kWh |
| Voltage Range | 52-92 V DC (parallel connected) |
| Maximum Expansion Units | Up to 3 per Powerwall 3 (40.5 kWh additional) |
| Operating Temperature | -4°F to 122°F (-20°C to 50°C) |
| Operating Humidity | Up to 100% RH, condensing |
| Dimensions (H × W × D) | 43.5" × 24" × 6.6" |
| Weight (Complete Unit) | 261.2 lbs (118.5 kg) with cover and bracket |
| Enclosure Rating | NEMA 3R, IP67 |
| Mounting Options | Wall or floor mount (floor stacking up to 3 units) |
| Compatibility | Powerwall 3 only (via Expansion Harness) |
| Certifications | UL 1973, UL 9540, UL 9540A unit level criteria |
| Maximum Elevation | 3000 m (9843 ft) |
| Warranty | 10 Years |
Tesla Powerwall 3 Expansion 13.5kWh Battery Storage Unit
SKU TESLA-PW3-EXP-1807000
Tesla Powerwall 3 13.5kWh Expansion
The Tesla Powerwall 3 Expansion is a battery-only storage module providing 13.5 kWh of additional energy capacity for existing Powerwall 3 systems. Designed as a cost-effective scalability solution, the Expansion unit contains no inverter and instead utilizes the master Powerwall 3's integrated inverter for charge control and power conversion. This architecture reduces system cost per kWh while maintaining the same robust environmental specifications as the main unit.
Each Powerwall 3 can support up to three Expansion units, enabling total system capacity of 54 kWh (13.5 kWh main unit + 40.5 kWh expansion capacity) for applications requiring extended backup duration or increased solar energy storage. The compact 43.5" × 24" × 6.6" form factor and 261.2 lb total weight allow flexible wall or floor mounting configurations.
Tesla Powerwall 3 Expansion Pack Features
- Lower Cost Per kWh: Battery-only design eliminates redundant inverter hardware, reducing expansion cost compared to additional full Powerwall 3 units
- Modular Scalability: Add one to three Expansion units as energy needs grow without complex system reconfiguration, enabling total capacity from 27 kWh to 54 kWh per Powerwall 3
- Simplified Integration: Direct connection via Expansion Harness to master Powerwall 3 with automatic recognition and unified control through single Tesla App interface
- Flexible Mounting: Wall or floor mount capability with floor stacking option (up to 3 units) provides installation flexibility for space-constrained locations or outdoor pad mounting
- Extended Backup Duration: Additional 13.5 kWh per Expansion unit increases backup runtime during grid outages
Tesla Powerwall 3 / Expansion Pack Comparison
| Tesla Powerwall 3 | + Expansion Pack |
|---|---|
| 13.5 kWh | +13.5 kWh per pack |
| 11.5 kW | Shared with base unit |
| Built-in inverter | Uses existing inverter |
| ~97.5% | Matches system efficiency |
| Wall-mounted | Stackable, similar design |
Tesla Powerwall 3 Expansion Pack Technical Review
Traditional battery expansion often requires adding complete battery-inverter units, creating redundant and underutilized inverter capacity. The Expansion unit's battery-only architecture allows the master Powerwall 3's 11.5 kW inverter to manage charge and discharge for all connected units, reducing total system cost while maintaining full performance. The 52-92 V DC voltage range and parallel connection architecture simplify installation and allow the master unit to balance charge across all batteries without external controllers. The Expansion unit maintains the same rugged environmental specifications as the main Powerwall 3, including IP67 ingress protection that withstands temporary submersion and NEMA 3R enclosure suitable for exposed outdoor installation.
The maximum capacity of 54 kWh per Powerwall 3 (one main unit plus three Expansion units) provides sufficient storage for extended backup applications, large residential loads, or small commercial installations.
Contact Us Today Get a Free System Quote Toll Free: 877-297-0014
Different solar panels, PV mounts, storage, & inverter systems available at low wholesale prices
Contact Us Today for sales, quantity discounts and expert reviews for the Tesla Powerwall 3 Expansion Pack
Residential Roof Mount System Pricing
Customized solutions available for residential rooftops, optimizing space and energy production.
Learn MoreView All Lithium Batteries
Check out our entire selection of Lithium Batteries perfect for on-grid and off-grid energy storage.
Learn MoreResidential Ground Mount System Pricing
We have the best residential solar system solution for your ground mount solar project at a low wholesale price.
Learn More