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Old 01-01-2021, 07:31 PM   #21 (permalink)
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I never understood why they never brought the Smart Roadster to the US. I guess they expected the typical Smart owner here to be horrified for having something sporty/fun under that brand.
IIRC there was a Dodge-branded concept car based on the Smart Roadster, but it was never released as a production model. Well, maybe the Smart brand was not so appealing to the performance market there, yet a rebadged (and easily re-skinned to get the family look of regular Dodge models) version could have some better chances to succeed.

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Old 01-20-2021, 05:39 PM   #22 (permalink)
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Solar car roofs don't make sense in any practical terms unless you have to deal with being away from the grid. It makes for more sense to place panels on a fixed roof optimized for solar exposure, vs. the sometimes and likely far less than ideal exposure of a car roof.

More simply, if you have the grid and can wait for car solar panels to charge the car, you can wait for the car to charge plugged in - from panels working far more efficiently.
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Old 01-20-2021, 08:57 PM   #23 (permalink)
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Solar car roofs don't make sense in any practical terms unless you have to deal with being away from the grid. It makes for more sense to place panels on a fixed roof optimized for solar exposure
Solar car roofs make sense as they liberate one from Big AC's grid. It makes more sense for roof panels to be optimized for Solar exposure, rather than fixed.

What power lost as the house battery transfers to the car batter?
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Old 01-20-2021, 10:47 PM   #24 (permalink)
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Solar car roofs make sense as they liberate one from Big AC's grid. It makes more sense for roof panels to be optimized for Solar exposure, rather than fixed.

What power lost as the house battery transfers to the car batter?
The problem is that most EVs spend most of their time charging at home. So whatever can be installed at home is still going to be more efficient. Likewise, once the car is fully charged, extra energy the solar panels mounted on the roof of it could produce becomes completely wasted. But obviously, any net metering or battery bank at home can keep home panels productive.

I think similar efficiencies are at play with AC charging vs. stepping up voltage for DC charging direct from panels, but I am not certain of that.

I am not saying they could not help or be useful on a car, but rather, for dollars spent on PV panels, there is far far more bang for the buck to be had with permanent home installations.
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Old 01-20-2021, 11:03 PM   #25 (permalink)
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I was trying for terse-but-balancing commentary. It may have come across as snarky contrarianism.

I think there's a case for both, with the house and car load-balancing with any excess power mining Bitcoin.

As far as that, how about inductive charging at traffic light left turn lanes?
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Old 01-21-2021, 10:03 AM   #26 (permalink)
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I say it's a waste of solar panels.
I want to park in the shade in the summer and panels laying flat on a car roof only produce about half of what they are rated for in new mexico in the summer. In the winter it's more like 1/3. Then if you live up north forgetaboutit.
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Old 01-21-2021, 11:36 AM   #27 (permalink)
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I'd say PV installed in the PNW is a waste period.

As I've been saying, I could install my panels in AZ, the people in AZ could pay a discounted rate for the electricity, and my payback period is reduced. It's a win/win proposition, but instead we like to have 3 different government subsidies pay for doing it the dumb way.

The value proposition just barely broke even after I got 3 different groups of citizens to non-voluntarily pay for most of it. "Hey, help me put these panels on my roof or I'll break yer leg".
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Old 01-21-2021, 12:34 PM   #28 (permalink)
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I'd say PV installed in the PNW is a waste period.

As I've been saying, I could install my panels in AZ, the people in AZ could pay a discounted rate for the electricity, and my payback period is reduced. It's a win/win proposition, but instead we like to have 3 different government subsidies pay for doing it the dumb way.

The value proposition just barely broke even after I got 3 different groups of citizens to non-voluntarily pay for most of it. "Hey, help me put these panels on my roof or I'll break yer leg".
Yep. On the best day, my 4.96kW array has only produced 3.8kW here in Eugene. This time of year, even half that peak production does not happen, and when it does, it is fewer hours. (Highest recorded totals this year were 28kWh in June, and 5.3kWh in December, or about $2.80 vs. $0.50 saved on those days.) It produced 4.9MWh for the year, saving just over $490. At that rate, it is going to take 12 years to pay for itself - plus my extra effort to keep them clean.

I would not have installed the panels without the maximum tax credits.

The up side is that panel efficiency keeps going up while costs continue to fall. So there may come a day where we are all just looking for new places to put them, and sure, why not the roof of a car? But I think we are a long way from that.
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Old 01-21-2021, 12:51 PM   #29 (permalink)
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Yep. On the best day, my 4.96kW array has only produced 3.8kW here in Eugene. This time of year, even half that peak production does not happen, and when it does, it is fewer hours. (Highest recorded totals this year were 28kWh in June, and 5.3kWh in December, or about $2.80 vs. $0.50 saved on those days.) It produced 4.9MWh for the year, saving just over $490. At that rate, it is going to take 12 years to pay for itself - plus my extra effort to keep them clean.
My 6.4 kW array produced 5 MWh last year, but I started in May. July was my peak, at almost 1 MWh. 220 kWh Nov, and 210 kWh Dec. My estimate was 1 MWh per year, per installed kW.

It will take 12 years to pay for itself, not adjusting for rate changes or opportunity cost of not investing the money into the stock market, which would have been phenomenal in March.

I'm glad I did it for the experience, and it will probably end up at least breaking even financially all things considered. Probably a nightmare when I go to re-roof, but that's future self's problem.
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Old 01-25-2021, 07:01 PM   #30 (permalink)
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I know a guy who recently got 2 solar panels for his van, in order to provide power for a fridge and other camping appliances. Now it seems like he usually parks it at a different position in order to get a more effective sunlight exposure.

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