Home solar update after seven years

The rooftop PV system we installed seven years ago has just passed another good round number – 16 000 KWh – having produced 4 000 KWh since my last update, in September 2016.

The daily average in that period is therefore 5.9 KWh/day, a little lower than the average of the first five years.  The drop in output is so small that it’s not really worth worrying about but three explanations come to mind, and all may have contributed to it:

  • We don’t bother cleaning the panels, so full-sun output may have dropped;
  • Our trees have kept on growing, so the panels may be shaded for longer, especially in winter;
  • The period we are considering includes two full Wet seasons but not quite two full Dry seasons (the month-by-month variation is shown here).

How much money are we saving now?

Continue reading “Home solar update after seven years”

Renewable energy – all the good news

Most of us know by now that we need to decarbonise the global economy – fast – if we are to have any hope of avoiding catastrophic climate change. Fortunately, the technology to do just that is booming, charging ahead so quickly that merely keeping up with the news is difficult.

Solar and wind power are demonstrating astonishing growth rates, with or without government incentives, now that their costs have dropped below the costs of new coal and (in many cases) gas; some time last year we even began hearing of cases in which it was cheaper to build and run new wind and solar power plants than just to run old coal plants.

Last year, for most of us, was the Year of the Battery. Tesla’s big South Australian battery did something its many little Powerwalls couldn’t, i.e., make battery storage seem like a serious option for the real world rather than just a cool idea. Bloomberg’s 2018 outlook report sees this continuing and allowing electric vehicles to undercut conventional, internal combustion engine cars on both lifetime and upfront cost by the mid-to-late 2020s.

The Green Path facebook page does its best to keep up with all this news but anyone wanting it all, and unfiltered, should bookmark or follow these sites:

RenewEconomy

Launched in 2012, RenewEconomy.com.au is an Australian website focusing on clean energy news Continue reading “Renewable energy – all the good news”

Eco-Fiesta 2017

This year’s Eco-Fiesta, a few days ago, was much like those of previous years: a lovely day in the park with all sorts of loosely ‘greenie’ and ‘alternative’ people and organisations.  I wrote enough about the 2014 and 2013 events that I shouldn’t need to present an overview this time, so I will dive straight in to the things which caught my attention.

Wildlife Queensland had a well-staffed stall featuring a great gallery of flying fox photos. These animals get a bad press and need all the support they can get.

North Queensland Regional Plan had a very boring stall (I’m sorry, but it’s true!) which tried to engage visitors in planning for our region, the local government areas of Charters Towers, Burdekin Shire, Hinchinbrook Shire and Townsville. It’s a state government initiative and welcomes online input here. I told them about our declining rainfall. What’s your concern?

The Beekeepers had their usual displays of honey and hives, Continue reading “Eco-Fiesta 2017”