OVERKILL
$100 Site Donor 2021
Originally Posted By: SHOZ
Looks like the Tesla Powerwall2 14kWh battery is $6500 US installed plus tax.
https://www.tesla.com/powerwall
OK, so I use ~700-800KWh a month. That's 23-27KWh in a 24hr period, in which currently, at this time of year, we have ~10hrs of daylight. During this period, my usage is my furnace blower motor, my computer, networking gear....etc. So my usage is lowest during the day. At night is when the majority of my usage is. In fact, this is how it is broken down on my bill, as daytime usage is the most expensive.
October, I used 712KWh
Mid-day usage: 95.16KWh
Morn/eve usage: 107.26KWh
Night usage: 472.58KWh
So monthly summary:
Daytime: 3KWh
Morn/Eve: 3.58Kwh
Night: 15.75KWh
So, for this to work for me, it would:
A) Have to be cheaper than staying on-grid
B) Produce enough power to charge the batteries plus provide ~7KWh of power during the periods where light is charging; the panels would need to provide ~27KWh (to be on the safe side) of power during their 10hr window of sunlight exposure.
C) In-line with A/B, would need to produce power to pay for itself above and beyond what it produces in B that can be sold back at a profit to the utility.
Currently, the 14KWh powerwall would not be sufficient for my daily usage profile, and would need to be coupled with a very large solar array to provide both sufficient charge capacity and power to run everything in the house and still make a profit to offset that initial cost. As solar cells become more efficient, this becomes more and more viable of course.
Looks like the Tesla Powerwall2 14kWh battery is $6500 US installed plus tax.
https://www.tesla.com/powerwall
OK, so I use ~700-800KWh a month. That's 23-27KWh in a 24hr period, in which currently, at this time of year, we have ~10hrs of daylight. During this period, my usage is my furnace blower motor, my computer, networking gear....etc. So my usage is lowest during the day. At night is when the majority of my usage is. In fact, this is how it is broken down on my bill, as daytime usage is the most expensive.
October, I used 712KWh
Mid-day usage: 95.16KWh
Morn/eve usage: 107.26KWh
Night usage: 472.58KWh
So monthly summary:
Daytime: 3KWh
Morn/Eve: 3.58Kwh
Night: 15.75KWh
So, for this to work for me, it would:
A) Have to be cheaper than staying on-grid
B) Produce enough power to charge the batteries plus provide ~7KWh of power during the periods where light is charging; the panels would need to provide ~27KWh (to be on the safe side) of power during their 10hr window of sunlight exposure.
C) In-line with A/B, would need to produce power to pay for itself above and beyond what it produces in B that can be sold back at a profit to the utility.
Currently, the 14KWh powerwall would not be sufficient for my daily usage profile, and would need to be coupled with a very large solar array to provide both sufficient charge capacity and power to run everything in the house and still make a profit to offset that initial cost. As solar cells become more efficient, this becomes more and more viable of course.
