4 ms·

what's the mileage like when you take into account the downhill return trip? Unless your commute is uphill both ways through the snow :)

Spivak 2y ago
There might not actually be a downhill return trip if the commute involves going over a bunch of hills as is common in a pretty well known city that both has a lot of teslas and fits the parent's description.
- decimalenough 2y ago
  If so, they'll get much of the energy expended going uphill back on the downhills, thanks to regenerative braking.
  - lathiat 2y ago
    In the Tesla Semi announcement, they showed pretty impressive data on exactly that. Here's a shot of the graph and some data: https://kilowatt.page/tesla-semi-regen-roundtrip-efficiency-is-95-percent/ https://kilowatt.page/tesla-semi-regen-roundtrip-efficiency-... Of course, this is from Tesla, and they famously puff up everything.. but I would expect even if not as good as claimed here, for the downhill part to certainly help a lot still. What may not help is if they fully charge at work and have no battery capacity to soak up the regen on the way home. Regen ability gets limited the closer you get to 100%.
    - hedora 2y ago
      Neither are Teslas, but our cars range from getting 10%-33% back when going back down a mountain (curves, no traffic, avoiding using the brake pads or switching between charge/discharge on the throttle). The results they report are incomparable for two reasons: - straight line steep mountain roads don’t exist. On curvy roads (like mine) they’d need to repeatedly round trip energy to and from the battery, and that’s going to eat about 5% each time. - the article claims going up and down the mountain uses as much energy as driving one mile. During the ascend/descend they drive 500 miles. The wind resistance for one mile flat and one mile on the mountain should be comparable, so their 95% efficiency number must be subtracting that (and rolling resistance) out.
  - lfsh 2y ago
    You assume the battery conditions stay the same. But what if the battery heats up a lot during a climb and is still hot while going down? It is know batteries charge slow when they are hot.
deleted 2y ago
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sashank_1509 2y ago
So I lose around 20% when going uphill to office. and I lose 10% when going downhill back home, clearly downhill is much better, but it’s not like I get back charge

Spivak 2y ago

There might not actually be a downhill return trip if the commute involves going over a bunch of hills as is common in a pretty well known city that both has a lot of teslas and fits the parent's description.

decimalenough 2y ago
If so, they'll get much of the energy expended going uphill back on the downhills, thanks to regenerative braking.
- lathiat 2y ago
  In the Tesla Semi announcement, they showed pretty impressive data on exactly that. Here's a shot of the graph and some data: https://kilowatt.page/tesla-semi-regen-roundtrip-efficiency-is-95-percent/ https://kilowatt.page/tesla-semi-regen-roundtrip-efficiency-... Of course, this is from Tesla, and they famously puff up everything.. but I would expect even if not as good as claimed here, for the downhill part to certainly help a lot still. What may not help is if they fully charge at work and have no battery capacity to soak up the regen on the way home. Regen ability gets limited the closer you get to 100%.
  - hedora 2y ago
    Neither are Teslas, but our cars range from getting 10%-33% back when going back down a mountain (curves, no traffic, avoiding using the brake pads or switching between charge/discharge on the throttle). The results they report are incomparable for two reasons: - straight line steep mountain roads don’t exist. On curvy roads (like mine) they’d need to repeatedly round trip energy to and from the battery, and that’s going to eat about 5% each time. - the article claims going up and down the mountain uses as much energy as driving one mile. During the ascend/descend they drive 500 miles. The wind resistance for one mile flat and one mile on the mountain should be comparable, so their 95% efficiency number must be subtracting that (and rolling resistance) out.
- lfsh 2y ago
  You assume the battery conditions stay the same. But what if the battery heats up a lot during a climb and is still hot while going down? It is know batteries charge slow when they are hot.

deleted 2y ago

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sashank_1509 2y ago

So I lose around 20% when going uphill to office. and I lose 10% when going downhill back home, clearly downhill is much better, but it’s not like I get back charge