| Story Views | |
| Now: | |
| Last Hour: | |
| Last 24 Hours: | |
| Total: | |
Battery Baloney
Playing Snakes and Ladders with Australia’s Electricity Supply.
By Viv Forbes & Helpers
Every day some green energy promoter or a battery salesman tells us how green energy with battery backup will supply Australia’s future electricity needs.
A battery stores energy. Energy can be stored using lead-acid, nickel/cadmium, lithium, molten salt, pumped hydro, hydrogen, flywheels, compressed air or some other smart gizmo. But NOT ONE battery produces new energy – they simply store and discharge energy produced by other means. They all deliver less energy than they consume. Moreover, to manufacture, charge, use and dispose of batteries consumes energy and resources.
The idea of producing reliable grid power from intermittent green energy backed up by batteries looks possible in green doodle-diagrams, but would be absurdly inefficient and expensive.
Solar works a Six hour day
Consider a solar panel which is rated to collect say 100 units of energy per day at full capacity, in full mid-day sunlight, with a clean panel, properly aligned to face the sun.
No solar energy arrives overnight and only minimal amounts arrive during the three hours after dawn or before dusk. That means that significant solar energy can only be collected for about 6 hours per day, providing it is not cloudy, raining or snowing. No amount of research or regulation will change this – the solar energy union only works a six-hour day and takes quite a few sickies. So instead of feeding 100 units of energy per day into the grid, at best, the panel supplies just 25 units.
Can the addition of batteries give us 24/7 power from solar?
To deliver 100 units of energy in 24 hours will require an extra 75 units of energy to be collected, stored and delivered by the batteries every sunny day. This will require another three solar units devoted solely to re-charging batteries in just 6 sunny hours.
Cloudy/wet days are what really expose the problems of solar plus batteries. (This is why isolated green power systems must have a diesel generator in the shed.)
To insure against, say, 7 days of cloudy weather would require a solar/battery system capable of collecting and storing 700 units of energy while still delivering 100 units to consumers every day. However if several consecutive weeks of sunny weather then occur, this bloated system is capable of delivering 7 times more power than needed, causing power prices to plunge, driving reliable generators out of business and wasting the life of solar panels producing unwanted electricity.
Solar energy obviously does best in sunny equatorial deserts, but that is not where most people live. And the huge Desertec Solar Power Dream for the northern Sahara has failed.
The report card on wind energy is different, but equally depressing.
When Australia had reliable, predictable coal-gas-hydro power in every state, the need for heavy interstate transmission was minimal. But green power will require robust and costly interstate transmission facilities to send large amounts of power at short notice from sunny coal-rich Queensland to cloudy Victoria, windless South Australia or droughted Tasmania.
Read the full report: http://carbon-sense.com/wp-content/uploads/2017/04/battery-baloney2.pdf [PDF, 157 KB]
Source: http://carbon-sense.com/2017/04/08/battery-baloney2/
