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Is the Tesla Powerwall 2 worth it?

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The Tesla Powerwall 2 is the most popular and cost-effective home storage product on the market, but is it worth the investment? 

The Tesla Powerwall 2 offers a range of functionality:

  • Storage of excess solar energy.
  • Up to 13.5kWh of backup in a power cut.
  • Off-peak charge and peak discharge.

So let’s look at the details…

Storage of excess solar energy.
By storing excess electricity generated by your solar panels during the day, that energy can then be used by your home during the evenings or on days with poorer weather, which can reduce your electricity bills by minimising the amount of electricity your home needs to draw from the grid


Up to 13.5kWh of backup in a power cut.
Your property and solar system will continue to function in a power cut. The Tesla Powerwall 2 can be installed to back up the whole house, or it can be installed such that it backs up only certain loads. Even with ‘whole house’ backup, certain large loads (such as a spa pool) can be excluded.

Not only will a backup enabled system keep the lights on in a power cut, it will also keep the solar system functioning. The system will continue to function whilst there is either a load or sufficient spare battery capacity to store any solar electricity it produces. The system will switch seamlessly and automatically.

You will need to specify a reserve percentage (e.g. 30%) and the system will always keeps that percentage of the capacity in reserve for a power cut. These setting can be changed.


Off-peak charge and peak discharge
More suppliers are starting to trial or offer time-of-use (ToU) tariffs, with time banded tariffs reflecting demand and supply and the true underlying cost of electricity.

With the advent of smart meters, able to record half hourly electricity use, the market will gradually witness the introduction of time banded tariffs reflecting demand and supply. Clearly there are large savings to be made by buying electricity at night and using it in the day. 


Tesla Powerwall













We recommend Tesla Powerwall 2 for several reasons:

Design and efficiency. The system uses a highly efficient battery and inverter (>90% AC in to AC out) combined with a battery management system controlling the state of charge, voltage, temperature and other parameters.

Quality control and safety. The system has been developed in-house by Tesla following their substantial experience from automotive battery technology. Every system undergoes extensive testing and inspection in their Gigafactory in the U.S. and the in-built management system incorporates an inherently multi-layered safety system.

10 year warranty. Unlike most battery manufacturers, Tesla prefers to talk in terms of years rather than cycles, cycles being a less easily understood concept than years. Tesla’s warranty guarantees unlimited cycles for self-consumption and time-based control (grid charging). The warranty guarantees the battery will retain 80% of its initial capacity after 10 years. .

Beautiful design, wall hung and weatherproof. Space is a consideration in residential properties, as indeed is aesthetic appearance. The design is modern and minimalist, designed to be seen, not hidden away out of sight. And the waterproof case means that it can be installed outdoors.

Flexibility. Tesla has designed a system that will allow AC-coupling with any PV system, or even without a PV system if used only for off-peak charging and backup. Furthermore, up to ten Powerwall 2 units can be installed together to help power systems of varying size.

High capacity (kWh) and power output (kW). Powerwall 2 has a total usable capacity of 13.5 kWh and a maximum power rating of 5kW.

Grid backup facilities. Powerwall 2 enables you to continue providing power to your home or business during power cuts.

Control From Anywhere. Manage your system from anywhere in the world with 24/7 mobile monitoring.



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