It’s worth noting there is a significant fudge factor, as the number released are incomplete, and every roof and install is different.īut compared to a normal roof of comparable quality plus normal solar, the Tesla Solar Roof is between 1.5x to 2x more expensive for the same capabilities. That gives a break even saved cost per kWh of about $0.04 – half most grid feed ins. Since we are just comparing prices, it’s a good starting point - though smaller installs will be a bit more expensive per square metre, and very large ones a bit cheaper per square metre.Īs a comparison, over a 25-year life (Australian solar panels typically have a shorter warranty), the solar panels should make at least 333,000 kWh. 10 kW is actually a very large array, and only about one third of that is needed to charge a Powerwall 2 each day. Two-storey houses or small houses will either need to increase the percentage of actual solar tiles, or simply generate less power. Houses with high direct solar use might achieve the savings, but it’s well above the $0.08 or so per kWh from feed-in credits. That means that each kWh produced needs to be sold for, or save the household, around $0.14 per kWh for the cost to break even. Solar output drops over time, but the house should generate 400,000 kWh or so over its life. According to Solar Choice, that will net us at least 40 kWh or so a day, depending on location. So 35 per cent solar on an a large Aussie home with a 300 square metre roof is about equivalent to a 10 kW solar array. Comparing numbers from other users, playing with the Tesla calculator and some back of the napkin math gives around 100 watts per square metre. Tesla have not given numbers on the exact size of each tile, compared to how much solar power it generates. That means the Tesla roof is $56,400 more expensive. That’s $39,000 worth to replace with a normal roof, or $95,400 if installing a Tesla Solar roof. Using a large single Aussie home as an example, it could have a 300-square metre roof - similar sizes are used for the Tesla price example. That means the Tesla solar roof is about 2.5 times more expensive than a comparable - but not solar - roof. Still, Tesla is targeting the higher end, so let’s use the $130 per square metre figure. Likewise, the costs when building a new house can be cheaper, as the old roofing does not need to be removed. If other repairs aside from tiles are needed, the costs can also be a lot higher. For speciality roofs like slate, it can be even more. Pricing depends on a huge number of factors, but an average roof, fully installed, ranges from around $80 per square metre on the low end, to $130 per square metre for higher end products such as terracotta tiles.
Depending on the area, common materials such as concrete tiles can be very cheap, guaranteed for 50 years or more, and last even longer without issue. We enjoy a wide range of roofing materials in Australia - many of which can be comparatively affordable. Tesla suggest that at the $21.85 US price, the ongoing solar generation over 30 years makes the roof cost competitive with a normal roof. The tiles are backed by a 30-year warranty, which is more about the solar - which degrades in output over time - than the panels themselves, which are tough glass. $21.85 US per square foot equates to $US235 per square metre, or $318 per square metre at current exchange rates to the Australian dollar. But as we have seen with the Powerwall, not everyone is worried about economics, and will happily jump on board as early adopters. The concept of solar roof tiles is not exactly a new one either - many companies have tried to bring them to market, but the cost to benefit ratio was just not there. Once we get firm pricing in the future, we will re-visit our calculations (And we have not included opportunity cost, any maintenance costs etc), but this is a good place to start. That makes it hard to accurately compare - so we will need to use the US pricing, as well as some reasonable assumptions about use in Australia. Read moreįor now, Tesla has not announced any specific Australian pricing, aside from the $1310 reservation cost. although installations won't begin until 2018, you can pre-order your solar roof panels now. Well, if you've been holding off that renovation, now's the time.
When Tesla announced its solar roof tiles, we said it would be a perfect product for Australian homes. You Can Now Pre-Order Tesla's Solar Roof In Australia
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