Neville’s TESLA POWERWALL 2 and SUSTAINABLE HOUSE DAY
In September our contractors installed the Powerwall 2 at a house in Tarrawanna, which was open to the public 3 days later. Sunday 17 September was Sustainable House Day, an annual national event organised by the Alternative Technology Association (ATA). Homeowners Neville and Judy are members of the Wollongong branch of the ATA and early adopters of energy efficiency technologies and sustainability methods.
61 visitors came along to see the features of this retrofit/continual improvement project. SunnyAfternoons CEO Glenn Cooper (back to camera in photo below) was especially popular explaining the Tesla battery to numerous groups of interested visitors.
6.2 kilowatts of solar panels are dc-coupled to an AGL Power Legato battery (installed in 2015) and ac-coupled to the new Tesla battery, giving a total of ~20kWh storage capacity. Imports from the grid will only be necessary during longer spells without much sun and will be more than compensated by solar exports most of the time. So the house will be energy positive and have net zero emissions.
The solar and battery features are complemented with insulation using window films, internal honeycomb and reflective blinds; double-glazed skylight and solar ventilation; heat pumps including Sanden solar hot water; and LED lighting throughout. The gardens are mostly native plants and edibles, watered via 3x5000l rainwater tanks, along with compost heaps and a worm farm plus recycling of logs, branches, bricks, pavers, metal and wood. The adjacent bush land and creek were cleared of extensive weeds and regenerated with advice from Council Bushcare. It is now a haven for birds, frogs, echidna etc.
The Tesla battery system was one of only 2 of the first systems installed in Illawarra region.