Introducing the Tesla Powerwall II

Solar Star Power are accredited Tesla Powerwall suppliers and installers servicing the Midlands. On a typical day the 13.4kWh Powerwall II will meet most of the average households power requirements using either electricity from your solar array or cheap rate overnight grid electricity. To put this into context a single Powerwall would boil the average kettle continuously for almost seven hours. Larger homes can also be fitted with multiple units to increase storage capacity.

In the event of electricity grid failure the Powerwall II Gateway will automatically disconnect from the grid and supply power to the property whilst also allowing the solar array to continue charging.

Several power suppliers are now offering special “time of use” Electric Vehicle / Home Battery charging rates from 5 pence per kilo watt hour (kWh) which combined with Solar PV means a Powerwall owner will never need to pay full price for electricity.

The Powerwall Gateway is an intelligent controller designed to smooth out the costs that will be incurred when variable daytime tariffs are introduced. Due to the high costs of producing large amounts electricity at peak periods variable cost tariffs (bands) are being introduced to discourage homeowners from turning on appliances early in the mornings and early evenings. The role of Smart meters is to measure and charge the variable bands to consumers bills. This is also known as Power Shifting.

Bulb Energy are currently proposing the tariff in excess of 40 pence kWh for the weekday period 4.30 pm to 7.30 pm.

The Powerwall Gateway requires inputs from the incoming mains and solar production in order to ascertain the amount of power left to charge the battery after allowing for current household usage. This is done by using 100 amp current clamps for measurement. In addition the system is connected via either Wi-Fi, LAN or Cell to Tesla’s computers for monitoring purposes and to allow new software to be downloaded. The Gateway is normally hard wired back to the owners internet router but if the connection is broken the inbuilt Cell (mobile SIM) will provide a back-up communication system.

The Powerwall II specifications are:

  • Mounting: Wall or Floor Mounted, Indoor/Outdoor
  • Inverter: Fully integrated Tesla inverter
  • Usable Capacity: 13.5 kWh
  • Power: 5 kW continuous, 7 kW peak short term discharge
  • Round Trip Efficiency: 90%
  • Operating Temperature Range: –20°C to 50°C (–4°F to 122°F)
  • Warranty: 10 years with a 16 year Life Cycle
  • Dimensions: 1150 mm x 755 mm x 155 mm (45.3 in x 29.7 in x 6.1 in)”

Tesla, Inc. is an American automotive and energy company based in Palo Alto, California. The company specialises in electric car manufacturing and, through its SolarCity subsidiary, solar panel manufacturing. It operates multiple production and assembly plants, notably Gigafactory 1 near Reno, Nevada, and its main vehicle manufacturing facility at Tesla Factory in Fremont, California. As of March 2019, Tesla sells Model S, Model X, and Model 3 cars. It is accepting reservations for the Model Y, Roadster, and Semi vehicles. Tesla also sells Powerwall, Powerpack, and Megapack batteries, solar panels, solar roof tiles, and some related products.

Nikola Tesla was a Serbian-American inventor, electrical engineer, mechanical engineer, and futurist who is best known for his contributions to the design of the modern alternating current electricity supply system. Born an ethnic Serb in the village Smiljan, Lika county, in the Austrian Empire (present day Croatia), on 10 July [O.S. 28 June] 1856.

Solar Star Power have been designing single and multi Powerwall installations for single and three phase domestic systems alongside small and large solar arrays for over three years in the Midlands. Our solar experience dates back to our first installations in 2010. We are MCS certified and HIES accredited.