Recent content by DCFC

I'm assuming the new car is for you and the teen is getting a hand-me down? For you, I'd buy a used beater to hold over until you're called up for a R2. I had a 2016 Mazda CX-5, absolute base model, and I loved that thing. Over 8 years and 95k miles, I had to replace the 12V battery once, I...

This is actually easy to explain. Internal combustion engines are notoriously inefficient at low loads. At higher loads, their efficiency goes up (less throttling losses as the throttle body is open more, more heat energy goes into pushing the piston down instead of into the coolant/oil/exhaust...

K, I'm a bit more with it this morning. Assumed 250 miles at 70mph as the reference point to calculate a constant to bundle in battery capacity, drag, frontal area, etc. Plotted out. Of course, this is a much more simplified calculation which leaves out the details of linear scaling of rolling...

I'm a bit sleepy, but check my equations: energy = power * time, ex. 100kW x 1hr = 100kWh time = distance/speed, ex. 50 miles / 100 mph = 0.5h energy = power * (distance/speed) distance = (energy/power)*speed Power scales with speed^3 and is in the denominator. Energy= battery capacity =...

I didn't dig into the calculations the AI did, but I think something is amiss. I plotted out the numbers and the curve has the wrong inflection. As speed increases, the range should drop exponentially. As noted, the power requirement goes up to the 3rd power with velocity. I drew in a...

Possibly sell-to-cover taxes for performance based stock compensation. Figure he's being conservative and selling off at the highest tax bracket percentage, so selling off 37% of his stock grants to cover the taxes. So maybe he got an extra $6 million award bonus as part of his compensation plan...

When the federal government decides to put money into it, that's when we will get better charging in both speed and availability. Of course, the whole grid and infrastructure needs an upgrade including energy storage to buffer against rapid massive increases in power demand.

My 2023 As a reference, my 2023 dual motor Polestar2 does about 3.0 mi/kWh on an open highway cruise with A/C going. It has a 78kwh battery pack. I usually stop every 150 miles or so which is good timing for bio breaks.

It can say whatever. But physics is physics. Heat generation (power) = Resistance * electrical current ^2. Adding an extension cable is adding resistance. Now, you can just back off the current to bring the temps down. But to run it at max current with the extra resistance is asking for trouble...

If I'm Rivian and knew you were charging at 48A with an extension, I''d void the warranty for the vehicle inlet. Quite frankly, it's very stupid to push that much current while using an extension unless you enjoy the added risk of burning down your truck and your home.

Those types of IR guns typically have a cone of detection. The further away it is from what it's measuring, the bigger the area. Usually somewhere on the device, it shows this cone angle. So whatever measurement it's giving will be some average over the area.

Also, extension cables are another big resistor in the electrical circuit, so everything gets hotter. If using an extension cable, turn down the current.

The one side missing the black pin cap is an indication that it got too hot; that enabled the cap to get loose. It may be lodged in the mating connector. How were you measuring temp? If using a flir, shiny objects often don't show correct. Matte colors typically show temperatures the best on...

I just did a quick look at an EVgo and Tesla close to the new RAN in Orange. At this instant.

Keep the current low. Heat generation is to the square of current. 48A will make 4x the heat of 24A. Power = volts * amps. Volts = amps * resistance. So heat generated = power= amp^2 * resistance.