Tesla Powerwall 3 Expansion 13.5kWh DC Battery - 1807000-20-B
Product details
- Official Tesla Powerwall 3 Expansion Battery.
- Adds an additional 13.5kWh of DC battery storage.
- Designed exclusively for Tesla Powerwall 3 systems.
- Supports scalable battery storage up to 94.5kWh.
- Compatible with systems delivering up to 44kW continuous AC output.
- Ideal for increasing solar self-consumption and backup energy storage.
- Modular design for straightforward installation and future expansion.
The Tesla Powerwall 3 Expansion 13.5kWh DC Battery is designed to increase the storage capacity of an existing Tesla Powerwall 3 energy storage system. This official Tesla DC expansion battery provides an additional 13.5kWh of usable energy storage, making it easy to expand your home battery system as your energy requirements grow.
A single Tesla Powerwall 3 supports up to 20kW of DC solar input, delivers 11.04kW of continuous AC output, stores 13.5kWh of energy and can start heavy electrical loads rated up to 185A LRA. This allows one Powerwall 3 to comfortably support the power demands of most homes while maximising solar self-consumption and providing reliable backup power.
Designed with scalability in mind, the Tesla Powerwall 3 system enables installers and homeowners to add multiple Powerwall 3 Expansion Batteries or additional Powerwall 3 units. A fully expanded system can provide up to 44kW of continuous AC power and a total storage capacity of 94.5kWh, making it suitable for larger residential and light commercial energy storage applications.
Key Features
Expansion at a glance
A DC battery that adds 13.5 kWh to a Powerwall 3 without adding another inverter. It works only with Powerwall 3 and connects to it by an expansion harness, with units in parallel.
Which kit to order
Expansion only
TES-PW3-EXPACK- Includes
- The Expansion battery
- You add
- Mounting kit and harness
With stacking kit
TES-EXPACK-S-PACK- Adds
- Stacking kit 1978070-00-B and 0.5 m harness 1875157-05-D
- Layout
- Behind the Powerwall 3, floor mount
With wall-mounting kit
TES-EXPACK-WM-PACK- Adds
- Wall mounting kit 1978069-00-C
- You add
- A 0.5, 2 or 4 m harness for the distance
Stacking puts up to three Expansions directly behind the Powerwall 3, and that layout is floor-mount only. The stacking option includes the short 0.5 m harness it uses. Wall-mounted Expansions can sit further away, so the wall-mounting option leaves the harness to you: choose 0.5 m, 2 m or 4 m for the run between units.
What it does to the system
One Powerwall 3 charges at up to 5 kW on its own. With Expansion units fitted, charging rises to 8 kW (AC and DC). A full system of four Powerwall 3 units and three Expansions stores 94.5 kWh. The Expansion runs between 52 V and 92 V DC and is not field serviceable.
Needed to connect it
-
Tesla Powerwall 3
The host unit. The datasheet lists the Expansion as compatible only with Powerwall 3.
-
Expansion harness, 0.5 m
Part 1875157-05-D. Already included in the "With stacking kit" option.
-
Expansion harness, 2 m
Part 1875157-20-D. Links an Expansion to a Powerwall 3 or to another Expansion.
-
Expansion harness, 4 m
Part 1875157-40-D. The longest of the three, for units mounted further apart.
Mounting kits on their own
-
Multi stacking kit
Part 1978070-00-B. Already included in the "With stacking kit" option above.
-
Wall mounting bracket
Part 1978069-00-C. Already included in the "With wall-mounting kit" option above.
Expansion questions
No. It is a DC expansion battery only and has no inverter of its own.
110 kg for the unit alone, 118.5 kg wall-mounted with the glass front cover and bracket. It measures 1105 × 609 × 168 mm.
Yes. It is IP67 and rated for −20 °C to 50 °C, indoor or outdoor.
IEC 62619, IEC 62933-5-2 and IEC 61000-6-1/-3.
Build your complete solar system
Everything you need in one place.
- Inverters
- Batteries
- Mounting Systems
- Cabling & Accessories
Delivery times vary by region:
- UK — 1-2 business days
- Highlands & Islands — 1-2 business days
Returns accepted within 14 days of delivery for unused items in original packaging.