etters in the Sunday Age of May 17 give us some views,
correct or otherwise, on Tesla developments.
Renewable energy: Local
manufacturers are being left high and dry
US company Tesla has just released a battery pack system for
domestic use ("Why Tesla's battery is a big deal", 10/5). What is now
becoming increasingly apparent is that with the government's championing of
coal at the expense of renewable technologies, we are backing an inefficient,
outdated and dirty energy source. As industrialised countries the world over
embrace clean energy technologies (in Germany, 30 per cent of power comes from
renewable sources), Australia will be left behind, potentially with stranded
assets. We'll also have missed out on opportunities in the expanding new
industry, with manufacturers placed at risk due to a lack of willingness by
government to resolve the furore over the renewable energy target and look to a
clean energy future.
Dennis O'Connell, Ivanhoe.
Tesla battery hoopla falls
flat
Unfortunately, the 10Kw Tesla battery is only warrantied for
50 cycles and so of little use beyond 50 days of solar charging, although handy
if there is a blackout. The smaller "7Kw" has also been canned by
executives of Tesla's associate company, the panel installer Solar City, who
say it is "unsuitable" for solar storage. This is mildly astonishing
as Tesla's chairman, Elon Musk, is also chairman of Solar City. The problem is
that due to lithium's high energy density but poor staying power, Li batteries
run down after a few hours. No good for the freezer or today's watt-hungry TVs.
The household still must be on the grid and in the US grid power is half the
price of here.
Meanwhile, an Australian flow battery about to be mass
produced in Mexico has been cycling every day for three years without fail and
produces steady, consistent current. It can be fully discharged and then fully
recharged to supply current almost ad infinitum. So it remains disappointing
that while Australia has long led in this field, with our technology lauded
offshore, local inventors find it near impossible to get their product
manufactured locally. The Vanadium Redox flow battery, for example, is now well
established in China but, like current flat panel solar technology, had its
origins at the University of NSW. In contrast to the Tesla hoopla, our zinc
bromine flow battery looks a dull work-horse, but it works.
Richard Campbell, Toorak.
Sold short by feed-in
tariffs
The Sunday Age (10/5) had three significant contributions
about solar power; the first applauded Germany's renewable energy progress, the
second highlighted power storage, while the editorial reminded us of how far
behind environmentally are the Coalition and Labor. The Coalition's policy is
to ignore global warming by supporting coal mining and coal-powered electricity
generation. My partner and I, pensioners, have used solar power for 20years and
were finally rewarded with a feed-in tariff of 66 cents per kw hour. However,
when we downsized to a new house in the country the tariff was cut to 6.2
cents. Our smart meter informs us that we export three times more solar energy
into the grid than we take from it. We are paid 6.2 cents and have to pay 30
cents. We, and Australians, are being ripped off. It seems that, like Germany,
we need more green representatives in government.
Brian Moynihan, Castlemaine.