Tesla Powerwall 3: Our Honest Review as Certified Installers
As a Tesla Certified Installer, ALPS Electrical has fitted dozens of Tesla Powerwall systems across the North East. The Powerwall 3 represents a significant upgrade over its predecessor, and after months of installations and monitoring real-world performance data, we are ready to share our honest assessment.
This is not a spec sheet review. This is based on hands-on installation experience and feedback from our customers who live with these systems every day.
Key Specifications
The Tesla Powerwall 3 packs 13.5 kWh of usable storage capacity into a compact wall-mounted unit. The standout change from the Powerwall 2 is the integrated solar inverter, which handles up to 11.5 kW of solar input. This means you no longer need a separate solar inverter, simplifying the installation and reducing the total system cost.
The continuous power output is 11.5 kW, with a peak output of 25 kW for short bursts. This is substantially more powerful than the Powerwall 2 and means the Powerwall 3 can comfortably handle high-draw appliances like electric showers, ovens and heat pumps without breaking a sweat.
Installation Experience
From an installer perspective, the Powerwall 3 is well designed. The integrated inverter means fewer components to mount and wire, and the DC connection from the solar panels goes directly into the Powerwall rather than through a separate inverter first. This reduces installation time by roughly half a day compared to a Powerwall 2 plus separate inverter setup.
The unit requires a dedicated Backup Gateway if you want whole-home backup during power cuts, which is an additional cost. Without the gateway, the Powerwall still stores and discharges solar energy but will not operate independently during a grid outage.
Tesla's commissioning process is straightforward for certified installers. The system is configured through the Tesla Installer app, and once online, the homeowner manages everything through the standard Tesla app.
The Tesla App
The Tesla app is where the Powerwall 3 truly shines. It is arguably the most polished energy management app available. The real-time energy flow animation shows exactly where your electricity is coming from and going to at any moment. You can see solar generation, battery charge level, home consumption and grid import/export in a clear, intuitive interface.
The app includes Storm Watch, which automatically charges the battery to 100% when severe weather is forecast. Time-Based Control lets you set charge and discharge schedules to take advantage of cheap overnight tariffs. The Self-Powered mode prioritises using your own solar generation before touching the grid.
Real-World Performance
From our installations across Teesside and County Durham, we see the Powerwall 3 consistently achieving 95-97% round-trip efficiency. On a sunny summer day, a typical 6kW solar array paired with a Powerwall 3 will generate enough electricity to fully charge the battery and export surplus to the grid, leaving the homeowner with zero electricity costs for the day.
In winter, the battery still provides significant value through tariff arbitrage. Customers on Intelligent Octopus or Octopus Flux charge the Powerwall overnight at 7-10p per kWh and discharge during the day when rates are 24p or more per kWh. This saves £300-500 per year even in the winter months when solar generation is lower.
Who Should Choose the Powerwall 3?
The Tesla Powerwall 3 is the right choice if you want a premium, all-in-one system with the best app experience, you value whole-home backup capability, you are a Tesla vehicle owner and want everything in one ecosystem, or you want the simplicity of a single integrated unit rather than separate inverter and battery components.
If budget is your primary concern, or you need more flexible battery sizing, the GivEnergy system may be a better fit. We install both and are happy to discuss which makes more sense for your specific situation.
Pricing
The Tesla Powerwall 3 including installation, Backup Gateway and all electrical work typically costs between £9,000 and £12,000 depending on complexity. When paired with a solar panel system, the combined cost is competitive because you are eliminating the separate inverter. All prices include 0% VAT. Contact us for a detailed quote specific to your property.