Originally Posted by Cujet
The way we do it in Florida, is to put up 10KW worth of grid tie solar. Run the meter backwards during the day, and cars charge at night via the copious power from our new powerplant.
Of course, our new natural gas powerplant has some righteous hot air currents above it 24/7. So much so, our glider can reach 10,000 feet altitude "thermaling" over the powerplant. So clearly, the powerplant remains an integral part of the equation.
In fact, very few people have been able to create solar systems that are stand alone EV chargers.
Oz is well down the path that California and Hawaii are at.
We don't get nett metering...6-15c for your excess solar during the day, and 27c for what you buy in.
It's the way that it should be, just not 1:1 like meters running backwards.
With the thousands of MW of rooftop solar pumping during the day, the power plants are pushed back as bid pricing falls.
Hawaii, and Ca have demonstrated that large scale renewables push the peak/off peak pricing such that their time of use tarrfis reflect the above. Cheaper at Mid-day, more expensive at night.
When solar is big enough, the peak/off peak pricing flips, charging at night is expensive.
As to Batteries, work sells these - can integrate your home, and if your use profile is right, they'll install extra cells, then pay you to be a "peaker" and send energy into the grid at peak times, for a premium...it will run your appliances while you aren't home etc. etc.
https://redbacktech.com/
But solar to battery (storage) to battery (car) is a hopelessly inefficient way of doing business...Lazard's levelized cost of storage (lifecycle analysis) is that the lifecycle costs of Li storage is $0.25/KWh when supplied with free energy (*)...plus losses (for e.g. the Tesla big battery in South Australia loses about 20% of what goes in).
Simplistic analysis in Oz, 13.5KW power wall $12,749 (Aus)...need two of those to charge your car...there's another $25 added to the cost of ownership.
Take a powerwall, 13.5Kwh, with a 10 year life, and charge/discharge it fully every day....49,275Kwh throughput in 10 years. $12,749 purchase price. 25.87 c/KWh...all paid for up front may as well pay retail as you go.