Energy Harvesting in the home

[lancaIV]

I am not patent selling agent or product seller ,
my interest is to save energy and the related costs !

For more detailed information this person here will give to you/us the right answer
https://angel.co/osma-tech

[Nink]

Here is my power costs for electricity. 
Winter
Weekends / Holidays    Off-peak   $0.083 per kWh
Weekdays:    7:00 a.m. to 11:00 a.m.    On-peak   $0.175 per kWh
11:00 a.m. to 5:00 p.m.    Mid-peak   $0.128 per kWh
5:00 p.m. to 7:00 p.m.    On-peak   $0.175 per kWh
7:00 p.m. to 7:00 a.m.    Off-peak   $0.083 per kWh

Summer
Weekends    Off-peak   $0.080 per kWh
Weekdays:    7:00 a.m. to 11:00 a.m.    Mid-peak   $0.122 per kWh 
11:00 a.m. to 5:00 p.m.    On-peak   $0.161 per kWh    I used  365.07kWh
5:00 p.m. to 7:00 p.m.    Mid-peak   $0.122 per kWh   I used  276kWh (this included weekends)
7:00 p.m. to 7:00 a.m.    Off-peak   $0.080 per kWh I used 1,133 kWh


Total bill is about $285 every 60 days (there is delivery charge $80, taxes, debt retirement charge ?? included in that $285 as well. 

With battery's I could convert all on / mid peak to off peak 365+276=640/60=~11kWh per day so assume 1kWh per battery I need 11 car batteries and an inverter but lets make it 12 to handle peaks. 

I can get car batteries for about $50 each so 12 is $600 and a good inverter relays etc I think I could salvage around for an inverter 2000W say $300  and a transformer to charge the batteries say another $300 so all up about $1200. 

This is probably about 4 year ROI and then my batteries start to die, inverters burn out etc  but I would get a battery backup system if I lose power for about 8 - 10 hours (if it happens when batteries are charged and not end of on peak period when i am flat.

Anyone done something like this ?