Cal88 said:
What was, roughly, your breakeven period on your solar installations?
Let's (roughly) price some components:
1) 400W panels: $100 each x 25 = $2500
2) Inverter: $2500
3) "Balance of System": Racking, wiring, breaker, etc: $2500
4) Level 2 charger: $500
TOTAL: $8000 for a 10kw system, no battery.
Self install, no cost.
If we use PVWatts.com, it'll tell us how much electricity we can expect daily, monthly, yearly. And off that you can figure how many miles can go into your vehicle battery each day from the sun.
For my location, a 10 kw array will generate a low of 798 kWh in Dec and Jan and a high of 1776 kWh for July.
That's a range of 25-57 kWh/day that can get put into the EV battery.
Quote:
How many miles can an EV go using 25 kw of it gets 70 mpge, if it gets 130 mpge?
Same question using 57 kw
Alright, let's work through this carefully:
First, "MPGe" means "miles per gallon equivalent."
1 gallon of gas = 33.7 kWh of energy (that's the official EPA conversion).
So if an EV gets 70 MPGe, that means it can travel 70 miles using 33.7 kWh.
If it gets 130 MPGe, it can travel 130 miles using 33.7 kWh.
Step 1: Find miles per kWh
At 70 MPGe:
Miles per kWh = 70/33.7 = approx 2.08 miles per kWh
At 130 MPGe:
Miles per kWh = 130/33.7 = approx 3.86 miles per kWh
Step 2: Now use that to figure out how far you can go with (winter) 25 kWh:
At 70 MPGe:
25 x 2.08 = 52 miles
At 130 MPGe:
25 x 3.86 = 96.5 miles
Step 3: Same thing for (summer) 57 kWh:
At 70 MPGe:
57 x 2.08 = 118.6 miles
At 130 MPGe:
57 x 3.86 = 220.0 miles
Conclusion:
This system will produce x miles free from the sun.
Winter inefficient EV = 52 miles
Winter efficient EV = 96 miles
Summer inefficient EV = 118 miles
Summer efficient EV = 220 miles
Who drives more than that?
At $4/gallon of gas, $8k would buy 2000 gallons. At 30 mpg, that's 60,000 miles.
At 10k miles per year, that's 6 years of driving.
The solar gas station setup will last for 25 years.
Now, you'll say, "I can't charge my car if I'm driving it, or it's parked at work."
Correct. Then you'd need batteries. How many batteries? How long will they last?
I'll leave that for another post.