this post was submitted on 09 Jun 2024
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No Stupid Questions

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Honestly it seems like a no-brainer to me to put a solar panel on the roof of electric cars to increase their action radius, so I figured there's probably one or more good reasons why they don't.

Also, I acknowledge that a quick google could answer the question, but with the current state of google I don't want to read AI bullshit. I want an actual answer, and I bet there will be some engineers eager to explain the issues.

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[–] forgrytaboutit@lemmy.world 184 points 5 months ago (13 children)

What I have seen previously is that the amount of energy you get from the solar cells that you could fit on the top of the car is really small compared to what it takes to charge the battery.

Since there is minimal benefit, and it's costly to include them and wire them to the battery, it hasn't been viewed as worthwhile.

[–] Bigfish@lemmynsfw.com 36 points 5 months ago (1 children)

For comparison, my rooftop solar array, with around 16 full-sized panels (~6kwp) produces just under 2 miles per hour in my electric car (around 3.3kwh/mi). Or in real life, takes about 2 fully sunny days to produce the power to charge the car.

[–] BlameThePeacock@lemmy.ca 7 points 5 months ago (1 children)

What kind of ev are you driving? That's insanely high energy usage.

My EV gets about 6km per kwh (around 4 miles)

[–] Guest_User@lemmy.world -3 points 5 months ago (2 children)

You get 4 miles per kwh and they get 3.3 and you call that insanely high? The 2.5-4 mile to kwh is really standard for EVs. I don't think the 3.3 is outside of the norm at all.

[–] Phil_in_here@lemmy.ca 18 points 5 months ago* (last edited 5 months ago) (1 children)

I don't know anything about EV efficiency, but the rates are inverse, so they are drastically different.

Fish gets 3.3kwh/mile

Peacock gets 4 miles/kwh or 0.25kwh/mile

[–] Guest_User@lemmy.world 8 points 5 months ago (1 children)

Oh I see that error now. I guess I just assumed from context his 6kwh panels generated 2 miles per hour. I get the confusion though

[–] doughless@lemmy.world 3 points 5 months ago (1 children)

I'm still a little confused, wouldn't 6kwh provide roughly 12 to 24 miles of driving range?

[–] Guest_User@lemmy.world 1 points 5 months ago (1 children)

They mentioned their car uses 3.3 kwh per mile. With their solar setup they can generate around 6hwh per hour. Meaning they can generate roughly 2 miles every hour of sunlight.

[–] doughless@lemmy.world 4 points 5 months ago

Right, which is why people are confused. Fish likely meant 3.3 miles / kWh, but that comes out to 20 miles for one hour of charge. But the fact they said just under 2 miles of range actually correlates with their 3.3kWh/mile statement, but no one has ever heard of an EV with efficiency that terrible.

[–] tyler@programming.dev 9 points 5 months ago

Fish reversed the numbers. It should have been miles per kWh

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