on the roof doesn't make much sense. What I did see the CSIRO testing was a portable solar array that you could roll up and store in the boot. IIRC they drove a Tesla across a large swath of Australia stopping and only charing on the portable array as needed
this post was submitted on 09 Jun 2024
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Also where I live, most cars spend a long time in underground (or at least covered) garages
So, this concept is too expensive :
(...) In February 2023, the company announced it would cease developing the vehicle, citing a failure to crowdsource sufficient funds.
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Look at the Fisker Ocean, it adds almost no range or energy, and leaves horrible and distracting shadows on the passengers. Youat as well ask why you can't charge a car with a D battery.
I don't remember what car it was but an ex's car had this. It was only really used for keeping the car from getting way too hot while it was off in the summer.
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Thanks for posting the question! Whole point of the community.
I think we'll see more of this in the future as they continue to make progress on inexpensive "solar paints" and the like. It's not a bad idea, it's just that the tech level doesn't show much bang for the buck...yet.
They have them on some international models of Hyundai electric cars. It's not nearly enough to power the car or charge the battery, though. It's more to just slow the battery down while it powers low-power things and look cool (it's part of the trim package). Solar panels need to be way more efficient than they are now for them to really make a difference with such a relatively small surface area.
Even on ideal conditions (close to the Equator, no clouds) like in Northeast Brazil, you only get 5.5 to 6.0 kWh/m^2 of Solar energy, which means the roof of a small car, with 1 m^2 of solar panels, would only generate that amount of electricity if they were 100% efficient. That's just 10% of the battery capacity of a small EV, like a BYD Dolphin.
My point is, even if solar panels doubled their efficiency, they would still only capture about half the energy of the Sun (currently, the best panels are at 24% efficiency), which means only about 2.5 to 3.0 kWh per day.
I have a very vague memory of watching a video where someone calculated the amount of energy produced, which was minimal. The benefit vs the cost is very poor.
The materials are more expensive and heavy than what car roofs are normally made of, and the charge they would generate is miniscule. It may not even offset the added energy needed to move the car because of the added weight. Particularly if you live far from the equator, or somewhere cloudy, it's probably not worth it.
When I was a kid (in the early 00's) there were solar cars on TV and they were always these absurdly shaped pancakes made of ultralight materials and couldn't even reach road speeds. I'm sure the tech has improved since then, but the real innovation that made electric cars possible was batteries. It's hard to generate enough energy on the same platform you need to move without it being too heavy.
You’re absolutely right - still absurdly shaped pancakes and they can’t reach highway speeds when powered on solar power alone. They do reach road speeds nowadays but they’re allowed to charge during and after race time (regulations are pretty confusing). I was on a solar car team a few years back.
It would increase the cost and also complicate the manufacturing process.
The amount of power you could pull from a single square metre of solar on the roof wouldn't increase your range meaningfully.
What it would do, is that you could possibly keep your starter-battery from going dead-flat if you left your car alone for a 1/2 month, in the summer ( snow would cover it, obviously ), & since bringing a lead-acid battery to dead-flat permanently-damages it, this would prevent costly problems for the car-owners.
( this happened to a friend with a Prius: had to replace the battery, and the damned thing was inside the rear wheel-well??? in a little compartment.
Origami-engineering's .. simultaneously incredible & stupidly-frustrating )
I've held for years that they should be doing it to keep the starter-battery trickle-charging, but .. why make the customers have fewer costly/frustrating problems?
While that might not be economically feasible, I've always wondered why plug-in electrics couldn't send power back into the grid. No solar? Send energy onto the grid during the day from the car and recharge during the off-hours at night. Solar? Recharge during the day and send energy onto the grid at night. Just make sure to set a minimum charge that will get you to a charging station.
IIRC some car batteries can be used that way, but it wears out the battery.
For LFP batteries it's irrelevant. They have a 3000 cycles to 80% cap, some of the new ones have 6000. That's 10 or 20 years assuming full discharges an recharges everyday.
Or in terms of lifespan, assuming a realistic 400km range (250 miles), it's between 1.2M and 2.4M km before the range reduces to 80% (750k and 1.5M miles). The car will be completely Theseus-ed at the point.
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The same could be asked with smartphones.
Why don't smartphones include solar panels on the back side of the phone?
Do you usually use your phone in the sun or leave it exposed to direct sunlight?
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We buy solar phone chargers for use in the backyard. They work ok. It would take a long time to fully charge, but it will keep you from going empty.