Alan_Brown wrote: »
I've just been skimming the thread and saw a few posts about the tidal lagoons and energy storage. I'm not sure about using batteries for storage (their ecological impact and short life-cycle puts me off) but I can see a use for compressed air energy storage.
As these lagoons are obviously on the coast, large bags can be fixed to the sea bed and filled with compressed air using excess energy from the barrage. When the energy is required, the air is released to drive turbines and generate electricity. This technology is used in Germany, where they use former salt caverns for the compressed air. However, there is an issue with pressure loss as the caverns empty. With bags under the sea, the weight of the sea on top will keep the pressure constant, right up until the bag is completely empty of air.
So yesterday was the first really good day in Feb with 7.6kWh of generation - and I managed to get 5.33kWh in and out of the battery as a result
I'm really quite impressed - especially as it's nominally "only" 4kWh of battery capacity - just shows that it'll contribute during the day and if there's enough hours of generation, can still re-charge and catch up again for later on.
The analysis assumes an average selling price of battery storage starting at $US250/KWh, deflating 5 per cent per year to $US150/KWh by 2027.
Powering the home with electricity in 2015 cost him $2289. But just over a year ago, he invested in a solar power system that has since significantly cut costs.
Nick, a self-confessed Tesla fanboy, was the first person in Australia to buy the company's Powerwall. He bought a 7kW battery, a 5kWp solar array, a SolarEdge inverter and a Reposit monitoring system for $16,790 in January 2015.
A year on and Nick's annual electricity bill has dropped to $178.71 – that's a 92% saving of $2110.
"The aim is to try and export about three times of what I import because my electricity cost is about three times [as much]."
The going rate is 8 cents per kilowatt-hour, but Nick installed a Reposit monitoring system – an $800 extra – that'll push the price up to $1 per kilowatt-hour at certain times.
"So when we had that really hot weather last week, what happened is, there's a peak event on the network and [electricity companies] asked batteries to start dispatching power, so it's kind of like a little power station if you like."
Cardew wrote: »
Selling electricity back to to the grid at up to $1 per kWh helps the figures!!
Martyn1981 wrote: »
Obviously UK PV generation and seasonality mean we are unlikely to see such savings, but the better these systems do in Australia (and elsewhere) the faster they'll be deployed, and the faster we'll see prices drop. At least that's what I tell myself, with my fingers crossed!
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