Notes - I used 5% as the discount rate since that's what they taught us at b-school. But that was 8 years ago. And the last I remember, our finance prof said that 5% was too high. I'm going to email him and ask what's the right rate to use today.
- I live in California/Silicon Valley. So gas and electricity is set accordingly. Feel free to copy the model and plug in your own numbers. I didn't take into account TOU rates or solar (I might add a solar tab later). And while I charge most of the time at work for free, I assumed in this model that all of my charging was at home.
- The price for the new Model S is for an S85 in blue metallic w/ obeche matte, tan leather, pano, supercharging, twin chargers, rear-facing seats, and parcel shelf.
- As omgwtfbyobbq on TMC noted, all of these numbers - including NPV - should technically have a negative sign in front of them. I was just lazy and got tired of typing in negative numbers everywhere.
- Electricity is currently at 3 mi/kWh or 333 Wh/mi. omgwtfbyobbq also noted that the draw from the wall might be higher. I'll adjust it when I get a good number. Feel free to suggest one in the comments.
- And, as noted in the previous tab, because I was lazy and for other reasons, I left out insurance, and didn't try to quantify safety, HOV lane access, cargo space, and other features.
Car cost NPV compsCar cost NPV comps |
|