- First Name
- Jul 8, 2020
- Reaction score
- Santa Cruz
- 2014 Zero S, 2013 Mazda 3
I don't see how the tonneau is smaller than the roof window.
Its not.I don't see how the tonneau is smaller than the roof window.
No. Not at all. Quite the contrary. I pointed out that your result and the numbers I gotwere not inconsistent. I also wanted to point out that weather is quite random and can make a fairly big difference in what panels can harvest. Here's what I've seen in Northern Virginia in the last few months:Are you saying that the pvwatts calculation in the end is incorrect? And so are my numbers?
You can read through their calculation assumptions by clicking the "i" symbols etc.
Agreed. My sunroof cover is always closed anyway so I wouldn’t miss it. Maybe have the sunroof cover be solar panels as well?Tesla needs to replace cabin glass roof with solar panels too. There might be enough space in cabin roof to increase energy capture by 50% of what the solar-powered tonneau cover captures.
Ok so optimistic compared to your specific location in comparison to your local data ;-)No. Not at all. Quite the contrary. I pointed out that your result and the numbers you had were not inconsistent. I also wanted to point out that weather is quite random and can make a fairly big difference in what panels can harvest. Here's what I've seen in Northern Virginia in the last few months:
The red line is a recursive average of MSE hours I received with a smoothing time constant of 7 days. The open circles show the NREL prediction for my region and the solid circles the NREL predictions from the pvwatts program for a much smaller geographical region. Note that what I'm getting is well below the latter data base's predictions. The coarser NREL estimates seem to fit my situation better but note that even so the MSE varied from half an hour above to an hour or more below recently whereas in March they were well below (an hour or more) either of the NREL predictions. That's why I said your estimates were probably a bit optimistic.
I don’t think there will be a solar cover, just a big glass panel. Looks very similar to my Model Y which has no cover.Agreed. My sunroof cover is always closed anyway so I wouldn’t miss it. Maybe have the sunroof cover be solar panels as well?
Yes. Optimistic compared to the real world as represented by places auch as Chicago and Denver.Ok so optimistic compared to your specific location in comparison to your local data ;-)
I think pvwatts does allow for some shading.I'd imagine you have some shading as well that would have ro factored in. Obviously, especially low angles will be subject to shading that won't be represented in pvwatts.
That's where ephemeris based MSE comes in. It tells you how geography comes into it. pvwatts tries to stir in weather too but it can't account for that maple tree or a corner of a dormer. Just using NREL MSE with your estimates of panel and DC/DC converter efficiency will give you the best you can expect with tracking but without particulars of shading from that old gum tree. The numbers for a 2.7m^2 panel aren't that impressive.So I suppose we can work with those numbers at least to make comparisons between regions.
It can't improve performance beyond what my simple method gives you. You would have to improve the weather for that (fewer clouds, less haze).So one idea I had was to add two axis tracking to improve performance.
I guess overall that I think the solar tonneau is a nifty gadget without much practical value.Let is know what you think.
Florida Man + Apocalyptic vehicle + beer + 0-60 in 2.9 = ?Being a retired engineer I love all the detail tech talk about solar panel efficiency. I have a different perspective and living in sunny Florida. An added 15 miles a day will get me downtown to dinner/BEER/shop and back; in 0 to 60 at 2.9 sec. I will have limited need to pay to plug into a charger with my CT sitting in the bright sun in front of my place. JUST MAKES ME SMILE THINKING ABOUT?
And the pot calls the kettle black. “Los Angeles has the highest rate of injury-producing and fatal traffic accidents in the United States.”Florida Man + Apocalyptic vehicle + beer + 0-60 in 2.9 = ?
what could happen?
I have been hit 3 times by cars while riding motorcycles. I used all my Vegas luck from those hits.And the pot calls the kettle black. “Los Angeles has the highest rate of injury-producing and fatal traffic accidents in the United States.”
It's actually best for day to day use! Instead of losing range every day from sitting around or going to the grocery store, it maintains or stocks away basically free power.I don’t think solar charging is great for day-to-day use, because it is so slow. But it might be super interesting for doing multi-day camping trips where you might be pushing the edges of your range. It would be particularly nice because you could use electric accessories without worrying overmuch about eating into range.