Tesla Motors Club
I want to want the new Powerwall. But none of the use cases add up for me (all estimates based on buying two Powerwalls for $13,000):
1) Time of use load shifting
I have an EV pricing plan from Dominion Virginia. Off-peak power is ~4c per kWh, on-peak power is ~8c per kWh.
Assuming I can charge my Powerwalls entirely during off-peak periods and use this power during on-peak periods, I would save $421/year.
This means it would take 30 years for the Powerwalls to pay for themselves based on time of use shifting.
2) Backup
Based on my energy usage, I estimate that two Powerwalls would keep my house up and running for ~17 hours during the winter and ~12 hours during the summer. This is a really nice benefit, as we do get relatively frequent power outages. But is it worth $13,000?
3) Solar self-consumption
I don't have solar yet, but I'm very interested in the new solar roof (or even traditional panels). I recently received a proposal for a 6kWh system that should provide about 50% of my power usage during the winter (when we use 1,100 kWh/month) and about 30% of my power usage during the summer (when we use 2,000 kWh/month).
How will the Powerwall help me in this situation? It's likely I would consume all the solar power generated during the day during the day. I assume that using the Powerwall for solar self-consumption only makes sense if you have surplus power at the end of daylight hours, in which case you can store this power for night-time use.
I'd love feedback from others about how they think the Powerwall will benefit them in these various areas.
1) Time of use load shifting
I have an EV pricing plan from Dominion Virginia. Off-peak power is ~4c per kWh, on-peak power is ~8c per kWh.
Assuming I can charge my Powerwalls entirely during off-peak periods and use this power during on-peak periods, I would save $421/year.
This means it would take 30 years for the Powerwalls to pay for themselves based on time of use shifting.
2) Backup
Based on my energy usage, I estimate that two Powerwalls would keep my house up and running for ~17 hours during the winter and ~12 hours during the summer. This is a really nice benefit, as we do get relatively frequent power outages. But is it worth $13,000?
3) Solar self-consumption
I don't have solar yet, but I'm very interested in the new solar roof (or even traditional panels). I recently received a proposal for a 6kWh system that should provide about 50% of my power usage during the winter (when we use 1,100 kWh/month) and about 30% of my power usage during the summer (when we use 2,000 kWh/month).
How will the Powerwall help me in this situation? It's likely I would consume all the solar power generated during the day during the day. I assume that using the Powerwall for solar self-consumption only makes sense if you have surplus power at the end of daylight hours, in which case you can store this power for night-time use.
I'd love feedback from others about how they think the Powerwall will benefit them in these various areas.