Sunder
10 MW
Chalo said:
Man, you get some good tips in this thread. I bought some handyman quality drill bits which were fine when I was working on wood and aluminium. But when I started working on some steel frame for a car port, they started snapping on me. I'm now wondering if I was using the wrong lubricant. (WD40 as well).
I actually upgraded to a trade quality drill bit set (About $100 for a 25 bit set, vs $60 I paid for the handyman quality one), and finished the job off, but that could have just been luck that I didn't break that too. But now I know better.
Chalo said:
I carefully use caffeine during the day to keep my energy and focus up. It definitely helps with knowledge work productivity. I also use Modafinil when I have long blocks of focus work. I'm not against light recreational cannabis use, and definitely not against medical cannabis use, even though recreational use is illegal in Australia. I use neither cannabis (or it's derived products - mostly because it's illegal here) or alcohol (Mostly because I am allergic). There's no way I think anyone should be riding a bike - or motorbike - while on either though. More or less the same assembling one too.
I don't think nervous system depressants should be compared to nervous system stimulants, and definitely not either compared to "mind altering drugs" like LSD, Psilocybin, and Meth, especially in the context of safety. Yes, all classes modify your perception of the world, but in very different ways.
liveforphysics said:
Have you ever read the book/seen the TED talk "Start with Why?" https://www.ted.com/talks/simon_sinek_how_great_leaders_inspire_action?language=en
I read his book about a year ago, and coincidentally a couple months ago, my employer hired him as a keynote speaker at our annual employee "All hands" conference. I started reading his stuff, because a year ago, I paid off my mortgage and realised my superannuation (Australian equivalent of the US's 401K), had a balance higher at 42, than most people have at retirement.
I needed a higher purpose than just money. I found my why. Although I still do the same job, I no longer sell network and security gear. I help companies build better IT systems. I make work better for hundreds of thousands of people, by making them never think about IT again: because the network doesn't fail, and security doesn't intrude on their job. As a result, my boss has had to take accounts off me because of how many customers want to buy, and I actually enjoy and look forward to large portions of my job.
The book also helped me recognise people who are working for money, and those who are working for purpose. However, I have to admit, Blind Freddy could see - even before your post above - that you were really passionate about electric vehicles, and the reason behind that. You're really making an impact in small ways and large, mate. I can see it here, I hope you're also doing it elsewhere.
liveforphysics said:
I bought these for an off-grid farm inverter (OSN Power 40AH):
https://www.alibaba.com/product-detail/OSN-POWER-Rechargeable-Above-20000-Times_60740418356.html
Bloody hell they are good. In a 1S10P configuration (24v), I dropped a spanner on it while attaching the bolts. It blew part of the cup off a good quality Kinchrome spanner. Not a cheap, thin Chinese made tool. Chunk of hot metal blown from a 4-5mm thick spanner gone in an instant. The rest of the spanner then glowed red hot for a few seconds until I grabbed a second spanner and knocked it off the terminals. And that wasn't even across the whole pack.
In terms of internal resistance, if I recall correctly, when I tested it, all of them were 1mOhm (Using the AC method, so DC could have been higher). 1mOhm is the lowest my meter will register.
A couple years ago, they were flooded - as in literally a foot of water. The lowest row were submerged, but the highest row wasn't. Some cells reached literal 0.0v, and others reached 5.2v. The battery continued to work after restoring things back to normal, but with about a 20-30% loss of capacity. I didn't test for any gain of internal resistance.
We were expecting a minimum 10 year life span out of them, but between the flooding and 55*C+ storage temperatures (This is a farm shed after all), they probably have reached the end of their useful life after about 6 years. They require frequent balancing now, and have lost at least 50% of the capacity (Guessed from run time, not measured).
But I think well taken care of in an electric vehicle, they'd be very good where very high current delivery and fast charging is more important than long range between charges. Australia is getting some very powerful J1772 and DC fast chargers, along with a Tesla's proprietary network. So the idea that we're limited to 2.4kw charging rate is no longer a concern. On motorcycles especially, where you don't tend to do 2h+ rides without some kind of break, I think a bike that could charge up 10kwh pack that could do 80% charge in an hour, is just as good as a bike that can do 300km with a 10L tank.
I also have a 6kwh LTO prismatic cell battery from a failed Kawasaki Ninja conversion (Had a low side before the bike was built, and wife convinced me that it's not worth it when I have two young kids and a wife dependent on me), and also building a 160wh prismatic battery for an eBike now I've been called back to the office. Neither of those have been field tested, but I hope that being for vehicle use, and not used/stored in a neglectful environment like the farm battery, these will be good for longer than a decade.
I can imagine how banged up I would get if I hit something or the chain broke and caught in the spokes. I really don't want to get hurt.
I could bring my 12S - LIFEPO4s though as they will fit in the rear basket. It is why cargo bikes can also be better when comparing range of e bikes.
A ride in the meat wagon is way > than a 50% chance.
