Keep your home going during a power blackout During power cuts Powerwall will automatically keep your important loads running, including allowing your solar panels to keep producing and charging/discharging as normal. Powerwall will keep the lights on, maintain the electricity supply to your boiler and controls, prevent the frozen food from defrosting and maintain the broadband so you can keep working. Powerwall allows you to set a portion of the battery to reserve for these events. Time-Of-Use (TOU) electricity users Time Of Use (TOU) electricity tariffs, These tariffs offer different electricity prices during the course of the day. “As an example charge your battery at 8p per unit, to then be used from your Powerwall 2 - at utility peak prices 15p” The traditional TOU tariffs are Economy 7 and Economy 10, but newer entrants to the electricity market have pioneered innovative electricity tariffs that enable owners to use their Powerwall to the fullest. Time-of-use or (TOU) tariffs Households on Economy 7 tariffs pay two different prices for their electricity. For seven hours during the night they are charged a cheap ‘off-peak’ rate for their electricity. This is usually used to heat the water cylinder, night storage heaters and more recently, Charge their Powerwall 2 Battery- charge electric vehicles. The actual off-peak times vary by region – for homes in the Electricity Northwest region it’s 00:30 until 08:00a The downside of this is that a more expensive tariff is paid for usage outside these times. Considering the positive effect of Solar panels in reducing the electricity bill of any household during daylight hours, which is especially good for those on Economy 7 as their peak rate electricity bill is reduced. Battery storage and Economy 7 “note:- presently smart meters will not work as Economy 7” The storage of surplus solar electricity is particularly valuable to those on Economy 7 tariffs. This is because they will be using the stored electricity during late afternoon, the evening and into the night, before the off-peak period begins, allowing the stored electricity to be used during the day when demand exceeds solar generation:- For example During the winter months we have less sunlight and therefore the solar electricity generation is lower. The majority of battery storage systems will hardly be used during this period. However, Powerwall 2 has another trick up its sleeve. Powerwall 2 can be programmed to automatically charge from the mains during the off-peak electricity times. This allows the household to use cheap rate electricity during peak rate times. If there is surplus solar electricity during the day then it will still charge the battery and reduce the electricity bill Description Powerwall is an outdoor rated, wall or floor mounted home battery system designed for self consumption of solar, load shifting and backup applications. Powerwall contains an integrated thermal control system, battery management system and Tesla’s own inverter, enabling a safe and efficient connection to all solar PV systems, or standalone applications. Powerwall contains a very useful 13.5kWh of usable energy storage. This price is for a Powerwall with the backup gateway, meaning that it will provide power in the event of a power cut. This requires the electrical circuits:- to be segregated into essential and non-essential loads. In retrofit applications the backup supply can be a simple socket adjacent to the Powerwall gateway, a couple of nominated circuits from the Powerwall’s Gateway, or a dedicated consumer unit for the essential loads. The initial price we could quote would be for a straight forward installation as every home is different and a price can only be guaranteed after a detailed survey. To get a top-notch installation, make sure your installer is officially designated by Tesla as a ‘certified installer’. Solar Harvester are a Tesla a ‘certified installer’. Certified installers have had to jump through hoops to obtain certified installer status. They have been vetted by Tesla and take part in various, on-going training and support activities. Installation standards for Tesla Powerwall certified installers are monitored very carefully. Tesla send round inspectors from time to time to ensure installations are perfect. Tesla has set the bar very high when it comes to keeping its customers happy. How is the Powerwall wired up in your home? Here is a typical installation process for the Powerwall:

Installation 1. The Powerwall box is taken out of the delivery van and moved gently to the base of the wall where it will be installed. 2. One of the electricians then screws a mounting bracket into the wall. 3. Next, the Powerwall is carefully placed upright onto a hoist. 4. The Powerwall is lifted up and eased back down onto the mounting bracket. 5. At this point the Powerwall is hanging nicely on your wall. 6. Then your Backup Gateway – the brains of the system – is mounted on the wall. This might be near the Powerwall or near your electricity import meter. 7. The Gateway is connected to your main fuse board. 8. Next, the Powerwall is connected to the Gateway. 9. It’s also possible for your solar panel system to be wired into the Gateway. 10. Then CT clamps are placed in appropriate places so that the Gateway can monitor all essential energy flows in the home. 11. There will also be isolators put in at various points for safety. 12. The Gatweway can communicate with your home router via Wi-Fi, though a wired ethernet connection is also recommended. 13. The electrician then commissions the system and you’re ready to go. Tesla Powerwall Price Although the headline Tesla Powerwall price can seem high, it’s actually good value for money in terms of cost per kWh of storage. The typical cost of the Powerwall in the UK, supplied and installed, is about £7,000 + VAT. That is for both the Powerwall battery itself, plus the new Backup Gateway mentioned above. Battery installations in the UK attract VAT at 20%. So the total cost to the residential purchaser would be £8,400 inc. VAT @ 20%. Please note: after the new VAT laws introduced on 1 October 2019, if a home battery is installed at the same time as a solar PV system, then the labour component of the battery and solar installations will have VAT @ 5% applied the materials component of the battery and solar installations will have VAT @ 20%. Tesla Powerwall – who is it for? The Tesla Powerwall 2 is a premium product. There are cheaper home battery products out there, with lower storage capacity But none as good value as the Powerwall. Fact :- “Powerwall 2” battery storage systems is the lowest cost battery per kwh Typical buyers include: · EV car owners with solar panels. £50 into a Tesla will get you - 2,500 miles · Customers who want the very best storage technology available today · People who want to make use of smart tariffs · Customers who want an aesthetically pleasing, all in one product · Home owners who would like to mount the battery outside · Customers who suffer from power-cuts · People without solar panels who want to charge the Powerwall with cheap, · off-peak electricity at night and let it out during the day when prices are high