jhm
Well-Known Member
I think it will be pretty easy for SolarCity to add a 7 kWh Powerwall to a 5 kW PV PPA for about 3c/kWh. That is you'd have a choice of
12c/kWh PPA for 5kW solar only
15c/kWh PPA for 5kW solar plus 7 kWh Powerwall
Only about a quarter of the power produced will be stored, so the incremental cost of storage is diluted by the total amount produced. The incremental cost per kWh stored is around 12 cents. This is the incremental cost that makes people dismiss batteries. It may be the right marginal value viewpoint for microeconomics, but consumers do not value all option that way. When the price is spread out over all the kWh the system produces, it is really a modest cost for a system with superior performance.
So I think uptake of the Powerwall option will be pretty strong. Many consumers will feel better about going solar if the system includes storage, and there are many reasons for this.
Poll. Suppose your utility rate is 16.5 c/kWh, and SolarCity offers you the PPA options below. Which do you chose?
A. Solar only for 12c/kWh
B. Solar plus Powerwall for 15c/kWh
C. Grid only for 16.5c/kWh
Personally, I know my wife and I would feel best about option B. We almost always choose B.
12c/kWh PPA for 5kW solar only
15c/kWh PPA for 5kW solar plus 7 kWh Powerwall
Only about a quarter of the power produced will be stored, so the incremental cost of storage is diluted by the total amount produced. The incremental cost per kWh stored is around 12 cents. This is the incremental cost that makes people dismiss batteries. It may be the right marginal value viewpoint for microeconomics, but consumers do not value all option that way. When the price is spread out over all the kWh the system produces, it is really a modest cost for a system with superior performance.
So I think uptake of the Powerwall option will be pretty strong. Many consumers will feel better about going solar if the system includes storage, and there are many reasons for this.
Poll. Suppose your utility rate is 16.5 c/kWh, and SolarCity offers you the PPA options below. Which do you chose?
A. Solar only for 12c/kWh
B. Solar plus Powerwall for 15c/kWh
C. Grid only for 16.5c/kWh
Personally, I know my wife and I would feel best about option B. We almost always choose B.