61–70 of 330 posts
I just bought a 12v 200ah battery for $2300 AUD. It could be done for less, but this was a premium model. Hopefully when I purchase a second one in a year or two, it will be a bit cheaper.
What’s the application? Sounds like the capacity of a standard $200 (yes AUD) car battery. I guess you want to hold onto that energy for a long time?
This is really cool, but could anyone familiar with the domain estimate how far we are along the S-curve? I.e. it took a long time for things to ramp up, then they accelerate really quickly and then they slow down again. Think Moore's Law, which is dead now. What would be the price estimate for 2030, for example. I think we're now around $100 per kwh (or something like that), what should we expect for 2030? $60? $20?
If musk is to believed, (and I think he's on point with this), $50/kWh will likely come within the next 5 years. So next 9 years? My expectation is beyond Tesla, the rest of the industry will have hit on that sub $50/kwh price point. That is going to make a lot of things really interesting. $2000 for a 30kWh home battery backup? Who wouldn't get one? To further this, with climate change leading to more and more extre…
Very few of the people that would currently benefit from a domestic backup battery could afford $2k, and most of the people who do have $2k to spare don’t live in places with unreliable electricity.
The overlap isn’t zero, but… for example, I visited Kenya with an ex of mine, we met a local friend of hers, that friend would’ve benefited from a more reliable electricity bill, but her monthly rent and utility bills combined was equivalent to about $85 and she couldn’t afford to move.
Earlier quoted context omitted.
> "check out some youtube videos on rebuilding 18650 packs so you don't do it in a horribly wrong way". Bad idea, because about 90% of what they do is fine, and 10% is very, very wrong. Unless you know what you're doing, it's almost impossible to tell which is which.
Fair enough. I haven't seen any of the 10%, but I'm sure they're out there. As an alternative to saying "go find info", how's this: https://www.youtube.com/watch?v=3KDiecphUk8 ? I just gave it a quick skip through, but the guy seems to know the correct approach.
I'm not going to evaluate someone's YouTube video on battery repair, sorry. There's no way I can "skip through it" and have any sense of what they're doing, and I generally try to avoid YouTube as a source of information. You'll find far better material on Endless Sphere, though there are plenty of dangerous ideas there.
Earlier quoted context omitted.
What’s the application? Sounds like the capacity of a standard $200 (yes AUD) car battery. I guess you want to hold onto that energy for a long time?
Lead acid batteries can emit fumes, so they are not useful in the same settings as li-ion batteries.
Although Li-Ion cells are getting cheaper and cheaper every year, it still is worth salvaging the good ones from depleted laptop battery packs. When a laptop battery pack is gone it's almost always the case of one, max two, 18650 elements that failed, not the whole pack. I've built some good power banks using empty shells (very cheap on Ebay, Aliexpress etc.) and fitting inside the good cells salvaged that way. They…
Does this require special knowledge and experience? I would be afraid to try it myself as I suspect that I or my devices would be harmed, either in the process or later on.
To my knowledge, this is the best informational site around regarding various battery technologies (including Lithium), and how to use them safely.
That's not the price of batteries in general, that's the price of Li-Ion batteries. Were Li-Ion batteries mass produced in 1991?
This is really cool, but could anyone familiar with the domain estimate how far we are along the S-curve? I.e. it took a long time for things to ramp up, then they accelerate really quickly and then they slow down again. Think Moore's Law, which is dead now. What would be the price estimate for 2030, for example. I think we're now around $100 per kwh (or something like that), what should we expect for 2030? $60? $20?
If musk is to believed, (and I think he's on point with this), $50/kWh will likely come within the next 5 years. So next 9 years? My expectation is beyond Tesla, the rest of the industry will have hit on that sub $50/kwh price point. That is going to make a lot of things really interesting. $2000 for a 30kWh home battery backup? Who wouldn't get one? To further this, with climate change leading to more and more extre…
I’ve been buying 18650 cells for 6 years and they’re always the same price shrug
Earlier quoted context omitted.
> Think Moore's Law, which is dead now. Look again. Moore's law in terms of single threaded performance is dead. In literal terms of number of transistors on a wafer, it's still increasing exponentially, just slower. And in terms of what mattered when people cited Moore's law, the decrease in price/performance, it's still exponential, just slower and multi core. It will end, as all exponential trends must end lest th…
hasn't it always referred to transistor count and not performance?
Which notably mentions performance. I have often interpreted Moore's Law to be the fact that doubling improvements in performance will continue roughly every 16-18 months, but not always directly proportionally to transistor count -- other ways to squeeze out doubling performance gains arise and often in unexpected places.