151–160 of 278 posts
Maybe before we get too excited about scaling production of EV batteries, we should solve the horrific abuses in the cobalt mines in the Congo [1] which provide 70%+ of all cobalt for all lithium ion batteries. [1] https://www.youtube.com/watch?v=CIWvk3gJ_7E
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This makes much more sense with large lifepo4 chemistry batteries that are expected to outlive the car by a wide margin. Lifepo4 batteries > 50kwh should easily handle 500,000 miles. Higher performance lithium ion will degrade at a rate faster than any expected return from a scheme like this. At least in Northern California it’s now cheaper for me to run solar+battery off grid than to pay pge. Lifepo4 pushes it over…
I have 100k miles on my 2018 Model S having Supercharged it the majority of the time the last four years. It has only 6% battery degradation of the 100kw pack. Tesla warranties their powerwalls for 15 years when configured as part of their aggregated virtual power plants. The batteries are demonstrated to be durable. New LFP chemistries that are heavier but more stable are ideal for stationary storage and high cycle…
The other strangeness for me is the recommendation to stay between 50 and 90 for daily use.
Studies of li-ion have shown 80-20 to be the optimal usage pattern for maximizing usable watts over the life of the battery.
I think EV owners would need to find some level of compensation for the additional cycles they would incur. Electric vehicles are expensive because of the battery so deteriorating the life of one of the most costly parts of the car doesn't feel like a great solution.
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Assuming V2G means Vehicle to Ground, this is something I would like to see for the following use-case. I would like to use my car battery as a temporary home battery in the inevitable case of a grid outage. This opens the option to bring energy home from another location. Reduce or eliminates the need for a battery in a grid-tied house. Am I crazy? Edit: Granted that doesn't mean the energy company can use my car's…
That's not crazy, it's actually a publicized optional feature on the F-150 Lightning, and the F-150 hybrid has an optional 240V 30A output that can be used as a home backup as well (although that'd be a bit more manual).
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I have 100k miles on my 2018 Model S having Supercharged it the majority of the time the last four years. It has only 6% battery degradation of the 100kw pack. Tesla warranties their powerwalls for 15 years when configured as part of their aggregated virtual power plants. The batteries are demonstrated to be durable. New LFP chemistries that are heavier but more stable are ideal for stationary storage and high cycle…
> if you don’t want or can’t get dedicated stationary storage (although it comes with generous federal, state, and utility subsidies in California). I installed stationary LFP batteries (from Enphase) on my house in CA 1.5 years ago, but I then discovered that the state and utility subsidies [1] only apply if you are in a very low income (for CA) bracket, have a health condition that requires backup power, or live in…
I'm particularly interested in whether you're doing any load-shifting with them, and if so, how easy it is to do with the software. I'm paying $.90/kWh at summer peak, so while I'm still on net-metering, I'm somewhat interested in going ahead and fully arbitraging during peak.
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I have 100k miles on my 2018 Model S having Supercharged it the majority of the time the last four years. It has only 6% battery degradation of the 100kw pack. Tesla warranties their powerwalls for 15 years when configured as part of their aggregated virtual power plants. The batteries are demonstrated to be durable. New LFP chemistries that are heavier but more stable are ideal for stationary storage and high cycle…
Good to hear about the S. I just got a used model X with free unlimited supercharging. Tesla doesn't recommend supercharging for around town use, which is strange considering it only goes over 1C for 5 minutes or so and only barely over, with active cooling. The other strangeness for me is the recommendation to stay between 50 and 90 for daily use. Studies of li-ion have shown 80-20 to be the optimal usage pattern fo…
I think EV owners would need to find some level of compensation for the additional cycles they would incur. Electric vehicles are expensive because of the battery so deteriorating the life of one of the most costly parts of the car doesn't feel like a great solution.
I haven't noticed any range loss ... yet. I know on mine the physical capacity is 14.4 kWh but it'll only let me use a band in the middle (?) of ~11 kWh (it eats 12 kWh charging and I'm assuming a 90% charging efficiency) (I also don't know if the chargepoint chargers report delivered or stored energy). This is all what I'm presuming to be enforcing no full charge/discharge cycles to lengthen the battery life.
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Did you know that the standard DC chargers communicate with the vehicle using PLC (Powerline communication) chips even though that communication is not over the high power conductors? I've always had the feeling the grid operators got that included because they thought they were going to communicate directly with the battery management system to control it as they wish. It never happened and now the standard is stupi…
Assuming V2G means Vehicle to Ground, this is something I would like to see for the following use-case. I would like to use my car battery as a temporary home battery in the inevitable case of a grid outage. This opens the option to bring energy home from another location. Reduce or eliminates the need for a battery in a grid-tied house. Am I crazy? Edit: Granted that doesn't mean the energy company can use my car's…
I think EV owners would need to find some level of compensation for the additional cycles they would incur. Electric vehicles are expensive because of the battery so deteriorating the life of one of the most costly parts of the car doesn't feel like a great solution.
LFP batteries can do 3k-10k cycles. Assuming a range of 500km per cycle out of an 100 kWh pack, that's 1.5 million km of total range (assuming 3k cycles). Only a small number of people will ever get that much out of a car - maybe 40% that, if maintained very very well. But we're talking Prius/Mercedes level endurance here, most cars won't make it that long. So in most cases, 70+% of the usable cycles in an LFP pack w…
Also, I'm not sure what components would wear out in an EV before the battery such that it would total the car out. If the EV batteries in totaled cars can be repurposed for grid use, then great, but I would expect them to get recycled and put back into cars unless strapping them to the grid is cheaper than recycling (seems maybe plausible?).
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> Environmental groups and common knowledge haven't caught up yet, but the fastest route to a low carbon future is a lot of factories producing ev cars, appliances, and batteries. Not sure where you are getting this, but sounds like you just have an axe to grid. Environmental groups have been pushing for decarbonization and accelerating the shift toward a renewable grid for forever and a day. They were the ones who e…
> As someone who has recently built an entire electrified high-performance house How much did it cost? If you don't mind me asking.
The remaining $/sqft is just like any other build in the Bay Area, so quite expensive, but a lot depends on structural changes, finish levels, premium features (or lack thereof), and other things that have little to do with energy performance of the building envelope.
As with all things, the bigger the house, usually the lower the cost per square foot for an individual system like a heat pump that have high fixed costs but scale up more cheaply. But the costs for things like a high performance external weather/air barrier and high performance insulation scale with the external surface area.
I'm not including things like electric stoves/ovens and heat pump dryer in that because those price differences are easy to find online.
In a new build, I think the premium for high performance could be brought down much lower, but only if performance is considered from the design stage.