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« on: April 18, 2018, 05:45:02 AM »
33,000 homes with 20Kw hr of batteries . Given an average of 12hr of daylight, with the first two hours after dawn and the last 2 hours prior to sunset . There is 8 hours of charge time and 16hrs of every 24hrs reliant on batteries.
How large are the roofs on these homes to support enough PV panels to power the home during the daylight loads of heating, cooling, cooking, entertainment, fridge, freezer etc plus charge 20Kw hr of batteries.
Over the 16 hrs of non PV generation per day all those batteries can produce is 41 Mw of power.
As there are losses in charging, discharging and conversion to AC, count on a loosing 20% or more of that 41Mw per hour over 16 hours. Also consider short winter days with the sun at a lower angle .
As peak demand on the Australian utility grid is 47,000Mw..............good luck with your battery storage. That is 47 million homes . Actually 59 million as lithium batteries should not be operated from 0% to 100% to 0% .
PV and batteries all sound well and good with noble goals etc. However the practical combination is nuclear baseload, PV daytime peaking with fossil carrying the morning and evening peaks when PV production is lost.
Liquid metal or molten salt fission reactors are the solution for utility grid power.
btw what was the retail price of power prior to the subsidized solar and wind generation being built vs after ?