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We've been running a 9kW PV array with Tesla Powerwall II for about 3 years now.
Annual bill currently about $700.00 ....but wait there's more...we have an EV which needs about 100kw a week for us to get about. (if my arithmetic is correct that's about 24 cents per 100km if we only feed it overnight with off-peak power...even less if we let the PV's charge it up) but...if you burn say 8 litres per 100km in a ICE powered car, the cost is about $11.00 per 100km)
So we are saving $3300 per year with the PV system and assuming you do an average of 8000km per year, $860 a year in fuel bills. All up over $4100 a year by going to renewable power.
Seems like a no brainer to me....
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