I'm surprised you were told vehicle battery life is only 40% at 8-10 years.
These sorts of figures are bandied about by anti EV types.
We did our research, and the figures for energy/vehicle costs in retirement (remembering energy and vehicle costs will go up over time) added up in our favour.
Then again , we don't us home aircon in summer and we don't have to drive 3 hours to get away from the masses!
EV battery life is extremely variable and can be anywhere between 40-80% after 8-10 years depending on, brand, use and charging cycles.
Fast charging can really kill some EV's but not so much on others.
Your use case may work out as you planned and mine would have also using the Solar sales reps figures.
I quickly discovered most solar sales reps are not qualified, often poorly educated and work solely on commission.
Unfortunately for me when using my own research and calculations it just doesn't add up at the moment.
I have been working with battery systems, power quality, power conversion and alternative energy for 40 years and have found most information is misleading or downright lies.
Solar panels last 20+ years but the inverter doesn't and most people fail to factor in replacing the inverter every 5-7 years (worst case)
Also some inverters have such terrible power quality output that they can cause damage or stress on things such as fridges and freezers, or washing machines.
Even taking into account current Government solar rebates and grants it was going to cost me $8,500 for solar and $14,000 for battery and solar.
That was best case.
Some clown wanted to put a 3KW system up that was a complete waste of time.
We rarely run aircon, only overnight if the temp stays above 30 overnight.
Mostly we leave all the windows open and run ceiling fans.
We get the see breeze and like to hear the water and the creatures of the night.
