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This really is the bees knees, providing you have the space for it.
Friend installed a simillar kilowatt system and said his 4 bedroom house is always a toasty 25c every day all year round, and he has no bills whatsoever.
Being an electrician he said he coupled it with a 40kwh nissan leaf car battery instead of a solar powerwall which is only 13.5kw. in effect the car is now the powerwall clever
His household daily use is 15kwh and so he has in effect at least an extra days charge always at hand no wonder his house is always so warm
I dont think a 4kw system for a house is enough, agree 9.6kw is commerical but if you have the space at your house fit and forget and ul not have to worry about bills ever again
Tesla are conning people with the powerwall. 13.5kw is barely enough to see a busy household like mine through a single day. Wish more EVs adopt bidirectional charging so we can use them as storage batteries.
The Tesla Cyber truck is over 100kw cant wait to use that as a weeks battery storage someday
