PowerWall 2.0

I know, I know, powerWall hasn't been started shipping yet and I will probably get mine later this summer (assuming my Utility company doesn't' screw me up after they add the installation and transformer price) but the specs of the product is already out.

So this made me think, what would I like to see in my next version:

1. Capacity Requirement:
Daily average US Household Energy need: 10KWH a day.
Storage reserve to cover 5 cloudy days: 10*5 = 50 kwh

A PowerWall 2.0 should have at least 50 kwh of storage capacity. If not in once piece, then a packaged price would do.

2. Cost
In Maryland, the normal utility rate is very close to 10 cents/kwh, so any off-grid arrangement that I look for, has to provide me values comparable to this rate.
Assuming 10 years battery life:
Energy consumed in 10 years: 10*365*10 = 36, 500 kwh
Cost of Grid Energy in 10 years: 36500 * 0.10 = 3,650 $

Solar Panel size to generate 10kwh/day = 10kwh/(3.3 hr average effective daylight) = 3kw
3kw Solar Panel cost : $3, 000
Solar panel life: 20 years
10 years cost for Solar panel: 3000/(20/10) = $1500

Battery break even cost : $3650 - $1500 = $2150.

So, a battery pack with installation and inverter should NOT cost more than $2150 to make it cost effective.