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So something I was thinking about why I was watching Doug DeMuros video on the Ford mustang Mach e, which I'm thinking about buying, was the big touch screen and the all digital gauge cluster. Just off handedly, it seems like all these screens drain more power than they have to.
I'm not saying they drain a ton of power, but wouldn't it be more efficient just have a normal analog style gauge, for speed and for drive mode selection, and then analog buttons for the AC and stereo system? And then you wouldn't have to have a dashboard screen for your speedo, and you have a smaller screen in the middle for infotainment. that just seems like it would save power especially on longer drives.
I guess what I'm asking is there any sort of empirical proof that having all these large screens doesn't affect range enough to make a difference compared to having more analog buttons on speakev

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The power consumption of a screen is going to be very small compared to say the heater or HVAC system, or indeed the traction system.

Just look up how much a modern LED screen consumes. The computer systems that drive it use a lot more power.
 

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The energy cost is negligible compared with the traction system.

When every car is an EV I expect that some will target market segments who are not interested in fancy technology and prefer simple dials.
 

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MGs are largely dial based.
 

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So something I was thinking about why I was watching Doug DeMuros video on the Ford mustang Mach e, which I'm thinking about buying, was the big touch screen and the all digital gauge cluster. Just off handedly, it seems like all these screens drain more power than they have to.
I'm not saying they drain a ton of power, but wouldn't it be more efficient just have a normal analog style gauge, for speed and for drive mode selection, and then analog buttons for the AC and stereo system? And then you wouldn't have to have a dashboard screen for your speedo, and you have a smaller screen in the middle for infotainment. that just seems like it would save power especially on longer drives.
I guess what I'm asking is there any sort of empirical proof that having all these large screens doesn't affect range enough to make a difference compared to having more analog buttons on speakev
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2020 Kona EV, Red, 230.4MJ (64kWh) Premium SE (10.5kW OBC)
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Even a pure analogue speedo will draw power from the traction battery through friction in the linkage to the roadwheel. An electrical system with a digital display will almost certainly consumer less power.
 

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Basically Teslas have large screens and they are the big dogs in the EV world ergo, 'the man' thinks thinks that all people who might want an EV needs any rival to have a big screen.
Also if you can run an epic touch screen from a battery that fits inside the screen for bloody ages (as evidenced by pretty much any hand held tablet on the market) A full sized 12V car battery could probably run one for a very long time and one topped up by the main traction battery could probably run until just before the heat death of the universe..
 

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dont see the obsession with claims like "gotta drive with lights and wipers off at night to get more range"
Most of those things run off the 12v battery that is barely running 100 or 200w of stuff at a time. when you put your foot down in a tesla you can be shooting up to 300000W into the engine. whatever the tablets use is rather irrelevant compared to the engine.
 

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They do, but the drain is very small and akin to not running the same systems in an ice car for fear of reducing mpg by making the alternator work harder.
When it rains range isnt reduced by the wiper blades, its reduced by the effort required in lifting hundreds if not thousands of litres of water in the air by the tyres over the course of the journey.
In reality the same thing is true for ICE drivers too, its just that they tend to be less inclined to reset the fuel computer at the first sign of rain.
 

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I think the move to digital is driven by things other than running efficiency - it's all about manufacturing cost. There have been plenty of complaints about Tesla's single iPad-style central screen in the Model 3, but consider how much cheaper that is to build, compared with other EVs that have a central screen, plus buttons, plus a binnacle in front of the driver (see photo of an e2008 and work out how many components that requires for two screens, binnacles, buttons etc)
Plus there's upgradability - if it's all electronic, you can upgrade/fix cock-ups more easily. Over the air if you're Tesla, via a complicated download that then didn't upload into the car (and required a dealer visit) in the case of my Peugeot e2008.
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... one of the biggest drivers towards touchscreens is they are simply more reliable. Other than actually breaking the screen which can be replaced easily - a single FRU that is outside the bulk of the dash - they are extremely reliable. Whereas a vast array of buttons and lights is a recipe for fiddly, expensive warranty work, late life loss of functionality due to plastics fatugue or contacts corroding, and finally adding functionality post-manufacture is essentially impossible without huge amounts of work.
All that said, I hate them, and one of the things I love about the i3 interior is the complete lack of a touchscreen and the presence of tons of tactile and finger-locatable buttons. :)
 
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