- source code in database: yes

- own IDE for questionable reasons: you bet!

- custom table objects: we got your back.

- strange forks of common python libraries: would you like warnings with that?

They raised another $2.5M round too.

Fellten and Allye are the biggest two here in the UK I think.

Where are you going?

Prompted by your comment I had a look at vehicle weights and two facts stood out

- ALL new cars are getting heavier EVERY YEAR because we keep adding more stuff (average car weight, and average SUV weight trend upwards from 2016 to 2023)

- The average electric car is heavier than a petrol equivalent but is lighter than an SUV

Weight certainly a problem, but the focus on EVs for weight is generally blown out of proportion.

https://www.thisismoney.co.uk/money/cars/article-13588773/Ne... https://www.sustainabilitybynumbers.com/p/weighty-issue-of-e...

So as soon as you tap the brake pedal just a little, you start regenerating and see the amps flow back into the battery (I have a little display on my dashboard). Only when you press the pedal further, do you start engaging the friction brakes.

I have no statistics on brake pad differences because we didn't build enough cars/didn't cover enough mileage to measure, but it is obvious that you would cut down on brake pad usage.

Everything I know about EVs and the tech behind it I share on: youtube.com/@foxev-content

- The panel sits at open-circuit voltage of 48V

- That then needs to be converted/boosted to 400V (conversion loss)

- The converter needs to talk to the BMS to make sure batteries can be charged at this moment (component that is live all the time and is a current draw)

- Need to think about it, but you want another set of contactors between panel and HV-Bus where the battery sits (current draw)

1km of driving is 150Wh so 1kWh gets you 6.6km or 4.1 mi

Let's be generous and say you have a 500W panel(punchy) for 8 hours at full blast (doesn't happen), you get 500W x 8 hrs = 4kWh. Lets say isolated converter loses you 10% so you are at 3.6kWh Thats 24km or 15mi of driving in perfect conditions.

2x Gigavac contactors, keep them closed costs you 24W, so that lowers the input further to 476W * 8hrs = 3.8kWh, less 10% = 3.42kWh ...

Someone who studied EE might be able to make this more accurate. Back of the napkin math, not totally impossible, but not worth adding it for a trickle charge. Adding components that can break, adding weight etc.

There are interesting solar cars out there where you reduce the weight heavily and fold out big solar sails. Then you are getting somewhere, for a city car you don't have enough surface. For an SUV or American Style Flatbed truck you have so much weight it's not worth it either.

You add a lot of complexity for marginal gains. Peak time you get maybe 500W which doesn't go very far.

I haven't made video about solar yet, but I am sharing what I know on https://www.youtube.com/@foxev-content

I like that you can go under the trees.

Thanks for reminding me it had page translations, I did a few of those and enjoyed it! Shame it went.

The question is excellent, because many people think you can just skip the transmission altogether and drive the wheels directly from the motor, but that is not the best solution. A gas car will have five gears, a big truck maybe even ten. This is to match the speed and torque as good as possible. Too little torque and you stall. To low a gear and you can't go fast. Even though electric motors have a lot more torque than petrol engines, it still makes sense to have a reduction gear with them.

The reversal: You could build a big petrol engine that does not need a transmission and has all the torque ready to get the car moving, but that would be expensive, wasteful and costly, you would end up with tractor like engines sticking out of the bonnet of your car.

Much better to pair a much "smaller" (can still be a V6 or v12) engine with a gearbox reduction. This is what every auto manufacturer does, no matter if electric or not. The simplification with EVs is that you only need one gear, so it is not operated by the user anymore.

Comments URL: https://news.ycombinator.com/item?id=44044747

Points: 3

# Comments: 1

Add asserts to the end of the function too.

Loop's can live in the middle, take as much I/O and compute out of the loop as you can :)

Like, how else should it work? There is of course always Google Ads but that strikes me as more short-sighted than building a backlog of content to refer back to.

  - 22 YouTube videos

  - two LinkedIn posts a week

Now I have:

  - 100 signups

  - 28 demo completions

  - 500 subscribers on YouTube

I somehow had it in my head the other way around that he can borrow $75 for $73 which wouldn't make sense.

Thank you.

"Investor Economics: Assume a $100 BNPL loan. $25 is paid upfront by the Consumer, so an Investor pays $73 for a $75 loan, discounted for risk, fees, and return expectations. The Investor receives $75 from customer repayments over 6 weeks minus servicing fees of $0.25. A $1.75 profit on $73 investment over 6 weeks is a 2.4% return, or 22.8% annualized (52 weeks/6 weeks = 8.67 periods each year; annualized return = (1+0.024)8.67 - 1)."