Re: [EVDL] EVLN: The physics of slapping solar panels on cars (charging while parked)
The mid-range (260 miles) Model 3 is indeed available, but it is $45,000. They count on the $7,500 federal tax break and state incentives to make it a $35,000 car. The long range Model 3 can currently be bought for about $49,000 with federal and state incentives then reducing that price. As I am retired with little earned income the $7,500 federal tax credit is of no value. I'll still wait for the $35,000 car. BobK On Oct 22, 2018 12:59 PM, "paul dove via EV" wrote: Last time I checked the midrange model 3 was available for order Sent from my iPhone > On Oct 22, 2018, at 9:47 AM, Bobby Keeland via EV wrote: > > My wife and I are on the waiting list for a 220 mile range Model 3. We > don't need the 310 mile range or the high performance. > > When we travel it is usually by motorhome. I've thought about towing the EV > on a trailer that is covered with solar panels. A recharge while boon > docking would be no problem. > BobK > > On Mon, Oct 22, 2018, 8:41 AM Robert Bruninga via EV > wrote: > >> ALL EV's are predominantly charged while parked. Solar panels on EV's are >> not for propulsion power but for battery charging during the 8 to 16 hour >> solar day while parked in the sun, not just the 30 minutes the car is in >> use. This is for those without a dedicated charger at home. >> >> Bob >> >> >> -Original Message- >> From: EV On Behalf Of Alan Arrison via EV >> Sent: Sunday, October 21, 2018 7:26 PM >> To: ev@lists.evdl.org >> Cc: Alan Arrison >> Subject: Re: [EVDL] EVLN: The physics of slapping solar panels on cars >> >> The numbers don't add up for solar panels on automobiles, never have, never >> will. >> >> This has been proven time and time again. >> >> There is no way it gets even 20 miles per kWh under anything but perfect >> conditions and slow speeds. >> >> And the energy from the panels again is under perfect conditions. >> >> It is so light because it has almost no crash protection. >> >> Al >> >> >> >>> On 10/21/2018 3:09 PM, Larry Gales via EV wrote: >>> When I look at the Stella Lux and Stella Vie, I get very different >>> results from the negative views of solar powered cars. I start with >>> the assumption that the Dutch students who have won most of the solar >>> car records are not actually lying. So, the specs for the 4 passenger >>> Stella Lux include these: >>> >>> >>> >>> Length >>> >>> 178 inches >>> >>> Width >>> >>> 69 inches >>> >>> Height >>> >>> 44 inches >>> >>> Weight >>> >>> 826 pounds >>> >>> Battery Capacity >>> >>> 15 kWh >>> >>> Motor Efficiency >>> >>> 97 percent >>> >>> Range on sunny day (Netherlands) >>> >>> 621 miles >>> >>> Range on sunny day (Australia) >>> >>> 683 miles >>> >>> Range at night (on battery) >>> >>> 403 miles >>> >>> Top Speed >>> >>> 77 mph >>> >>> >>> >>> So, if the range at night is 403 miles and the battery is 15 kWh, that >>> translates to 26.8 miles/kWh. Let us suppose that is under ideal >>> conditions, and that a more realistic value is 20 miles/kWh. The >>> solar PV array is 1.5 kW, so a more realistic value under real world >>> conditions is >>> 0.75 kW. In Seattle, where I live, which has about the worst solar >>> potential in the USA, the average solar intensity in July is 6.3 sun >>> hours. >>> So, (0.75 * 6.3 * 20) = 94.5 miles. If we usually travel only 40 >>> miles/day, I could easily see traveling 200 miles on accumulated solar >>> energy, after, say, a week of 40 miles/day travel. And given that 5 >>> months/year we average over 60% of the July values we can travel about >>> 60 miles/day just on stored sunlight from the car. And the 5 >>> passenger Stella Vie is just as efficient. >>> >>> On Sun, Oct 21, 2018 at 12:09 AM brucedp5 via EV >>> wrote: >>> https://qz.com/1423288/why-dont-we-have-solar-powered-cars-physics/ The physics of why we don’t have solar-powered cars October 15, 2018 Michael J. Coren [image https://cms.qz.com/wp-content/uploads/2018/10/image1-e1539387897807.p ng The Sono Motors Car ] The nuclear furnace at the center of solar system powers almost everything on earth. Photosynthesis, wind, and even fossil fuels (once decomposed living matter) all derive in some way from the star we call the Sun. So why isn’t it enough to power our cars? It’s all about energy density: how much energy falls on a surface relative to how much is consumed. We can have solar powered e-bikes that cover thousands of miles, sailboat drones that cross oceans, even ultra-light aircraft that circumnavigate the globe. What do they have in common? They’re all very light, slow, and consume a trickle of electrons. Solar panels generate just enough electricity to keep them moving. For anything weighing thousands of pounds, like a car, the energy equation is daunting. A few intrepid carmakers are slapping solar panels on their vehicles anyway. Few have gotten very far. The G
Re: [EVDL] EVLN: The physics of slapping solar panels on cars (charging while parked)
Last time I checked the midrange model 3 was available for order Sent from my iPhone > On Oct 22, 2018, at 9:47 AM, Bobby Keeland via EV wrote: > > My wife and I are on the waiting list for a 220 mile range Model 3. We > don't need the 310 mile range or the high performance. > > When we travel it is usually by motorhome. I've thought about towing the EV > on a trailer that is covered with solar panels. A recharge while boon > docking would be no problem. > BobK > > On Mon, Oct 22, 2018, 8:41 AM Robert Bruninga via EV > wrote: > >> ALL EV's are predominantly charged while parked. Solar panels on EV's are >> not for propulsion power but for battery charging during the 8 to 16 hour >> solar day while parked in the sun, not just the 30 minutes the car is in >> use. This is for those without a dedicated charger at home. >> >> Bob >> >> >> -Original Message- >> From: EV On Behalf Of Alan Arrison via EV >> Sent: Sunday, October 21, 2018 7:26 PM >> To: ev@lists.evdl.org >> Cc: Alan Arrison >> Subject: Re: [EVDL] EVLN: The physics of slapping solar panels on cars >> >> The numbers don't add up for solar panels on automobiles, never have, never >> will. >> >> This has been proven time and time again. >> >> There is no way it gets even 20 miles per kWh under anything but perfect >> conditions and slow speeds. >> >> And the energy from the panels again is under perfect conditions. >> >> It is so light because it has almost no crash protection. >> >> Al >> >> >> >>> On 10/21/2018 3:09 PM, Larry Gales via EV wrote: >>> When I look at the Stella Lux and Stella Vie, I get very different >>> results from the negative views of solar powered cars. I start with >>> the assumption that the Dutch students who have won most of the solar >>> car records are not actually lying. So, the specs for the 4 passenger >>> Stella Lux include these: >>> >>> >>> >>> Length >>> >>> 178 inches >>> >>> Width >>> >>> 69 inches >>> >>> Height >>> >>> 44 inches >>> >>> Weight >>> >>> 826 pounds >>> >>> Battery Capacity >>> >>> 15 kWh >>> >>> Motor Efficiency >>> >>> 97 percent >>> >>> Range on sunny day (Netherlands) >>> >>> 621 miles >>> >>> Range on sunny day (Australia) >>> >>> 683 miles >>> >>> Range at night (on battery) >>> >>> 403 miles >>> >>> Top Speed >>> >>> 77 mph >>> >>> >>> >>> So, if the range at night is 403 miles and the battery is 15 kWh, that >>> translates to 26.8 miles/kWh. Let us suppose that is under ideal >>> conditions, and that a more realistic value is 20 miles/kWh. The >>> solar PV array is 1.5 kW, so a more realistic value under real world >>> conditions is >>> 0.75 kW. In Seattle, where I live, which has about the worst solar >>> potential in the USA, the average solar intensity in July is 6.3 sun >>> hours. >>> So, (0.75 * 6.3 * 20) = 94.5 miles. If we usually travel only 40 >>> miles/day, I could easily see traveling 200 miles on accumulated solar >>> energy, after, say, a week of 40 miles/day travel. And given that 5 >>> months/year we average over 60% of the July values we can travel about >>> 60 miles/day just on stored sunlight from the car. And the 5 >>> passenger Stella Vie is just as efficient. >>> >>> On Sun, Oct 21, 2018 at 12:09 AM brucedp5 via EV >>> wrote: >>> https://qz.com/1423288/why-dont-we-have-solar-powered-cars-physics/ The physics of why we don’t have solar-powered cars October 15, 2018 Michael J. Coren [image https://cms.qz.com/wp-content/uploads/2018/10/image1-e1539387897807.p ng The Sono Motors Car ] The nuclear furnace at the center of solar system powers almost everything on earth. Photosynthesis, wind, and even fossil fuels (once decomposed living matter) all derive in some way from the star we call the Sun. So why isn’t it enough to power our cars? It’s all about energy density: how much energy falls on a surface relative to how much is consumed. We can have solar powered e-bikes that cover thousands of miles, sailboat drones that cross oceans, even ultra-light aircraft that circumnavigate the globe. What do they have in common? They’re all very light, slow, and consume a trickle of electrons. Solar panels generate just enough electricity to keep them moving. For anything weighing thousands of pounds, like a car, the energy equation is daunting. A few intrepid carmakers are slapping solar panels on their vehicles anyway. Few have gotten very far. The German startup Sono Motors is adding 330 integrated solar cells on the roof, sides, and rear to give its vehicle a 30-km boost out of a 250-km (155-mile) battery range. Meanwhile, Dutch startup behind LightyearOne claims its electric car will “charge itself.” Although it has yet to unveil a vehicle, potential customers can put down deposits for a €119.000 ($157,000) car promising to travel 10,
Re: [EVDL] EVLN: The physics of slapping solar panels on cars (charging while parked)
I installed four 158 watt solar panels (DM Solar), a charge controller ( Morningstar) and an inverter/charger (Magnum) in the RV some time ago. RV manufacturers do not leave much space for the coach battery and then they use a dual purpose battery that is a poor starting battery and a worse deep cycle battery. I replaced the original coach battery with two huge 255 aHr Lifeline deep cycle batteries that I put in one of the "basement" compartments. I believe that there are ways that you can set up an EV to grid system that would work with a Tesla. The alternative is to just unplug from the Tesla and run a cable from the trailer mounted solar panels to our charge controller. Who needs an RV Park? I've thought about restoring my 1951 Chevy pickup with an electric motor, lots of Li-Ion batteries and solar panels on a rack that is over the bed and the cab. The solar panels will not power the pickup by themselves, but while parked or when driving down the road the batteries will be charging. An old pickup is not a great conversation vehicle, but it is a great looking vehicle. No longer burning gasoline would be great. BobK On Oct 22, 2018 11:03 AM, "Peter C. Thompson via EV" wrote: This actually makes sense - especially if you have lots of batteries in the RV as well. I think it would also be possible to use the EV as the Large Battery for your RV, but Tesla may not allow such a modification. Cheers, Peter On 10/22/18 6:47 AM, Bobby Keeland via EV wrote: > My wife and I are on the waiting list for a 220 mile range Model 3. We > don't need the 310 mile range or the high performance. > > When we travel it is usually by motorhome. I've thought about towing the EV > on a trailer that is covered with solar panels. A recharge while boon > docking would be no problem. > BobK > > On Mon, Oct 22, 2018, 8:41 AM Robert Bruninga via EV > wrote: > >> ALL EV's are predominantly charged while parked. Solar panels on EV's are >> not for propulsion power but for battery charging during the 8 to 16 hour >> solar day while parked in the sun, not just the 30 minutes the car is in >> use. This is for those without a dedicated charger at home. >> >> Bob >> >> >> -Original Message- >> From: EV On Behalf Of Alan Arrison via EV >> Sent: Sunday, October 21, 2018 7:26 PM >> To: ev@lists.evdl.org >> Cc: Alan Arrison >> Subject: Re: [EVDL] EVLN: The physics of slapping solar panels on cars >> >> The numbers don't add up for solar panels on automobiles, never have, never >> will. >> >> This has been proven time and time again. >> >> There is no way it gets even 20 miles per kWh under anything but perfect >> conditions and slow speeds. >> >> And the energy from the panels again is under perfect conditions. >> >> It is so light because it has almost no crash protection. >> >> Al >> >> >> >> On 10/21/2018 3:09 PM, Larry Gales via EV wrote: >>> When I look at the Stella Lux and Stella Vie, I get very different >>> results from the negative views of solar powered cars. I start with >>> the assumption that the Dutch students who have won most of the solar >>> car records are not actually lying. So, the specs for the 4 passenger >>> Stella Lux include these: >>> >>> >>> >>> Length >>> >>> 178 inches >>> >>> Width >>> >>> 69 inches >>> >>> Height >>> >>> 44 inches >>> >>> Weight >>> >>> 826 pounds >>> >>> Battery Capacity >>> >>> 15 kWh >>> >>> Motor Efficiency >>> >>> 97 percent >>> >>> Range on sunny day (Netherlands) >>> >>> 621 miles >>> >>> Range on sunny day (Australia) >>> >>> 683 miles >>> >>> Range at night (on battery) >>> >>> 403 miles >>> >>> Top Speed >>> >>> 77 mph >>> >>> >>> >>> So, if the range at night is 403 miles and the battery is 15 kWh, that >>> translates to 26.8 miles/kWh. Let us suppose that is under ideal >>> conditions, and that a more realistic value is 20 miles/kWh. The >>> solar PV array is 1.5 kW, so a more realistic value under real world >>> conditions is >>> 0.75 kW. In Seattle, where I live, which has about the worst solar >>> potential in the USA, the average solar intensity in July is 6.3 sun >>> hours. >>> So, (0.75 * 6.3 * 20) = 94.5 miles. If we usually travel only 40 >>> miles/day, I could easily see traveling 200 miles on accumulated solar >>> energy, after, say, a week of 40 miles/day travel. And given that 5 >>> months/year we average over 60% of the July values we can travel about >>> 60 miles/day just on stored sunlight from the car. And the 5 >>> passenger Stella Vie is just as efficient. >>> >>> On Sun, Oct 21, 2018 at 12:09 AM brucedp5 via EV >>> wrote: >>> https://qz.com/1423288/why-dont-we-have-solar-powered-cars-physics/ The physics of why we don’t have solar-powered cars October 15, 2018 Michael J. Coren [image https://cms.qz.com/wp-content/uploads/2018/10/image1-e1539387897807.p ng The Sono Motors Car ] The nuclear furnace at the center of solar system powers almost everything on earth. Photosynthesis, win
Re: [EVDL] EVLN: The physics of slapping solar panels on cars (charging while parked)
This actually makes sense - especially if you have lots of batteries in the RV as well. I think it would also be possible to use the EV as the Large Battery for your RV, but Tesla may not allow such a modification. Cheers, Peter On 10/22/18 6:47 AM, Bobby Keeland via EV wrote: My wife and I are on the waiting list for a 220 mile range Model 3. We don't need the 310 mile range or the high performance. When we travel it is usually by motorhome. I've thought about towing the EV on a trailer that is covered with solar panels. A recharge while boon docking would be no problem. BobK On Mon, Oct 22, 2018, 8:41 AM Robert Bruninga via EV wrote: ALL EV's are predominantly charged while parked. Solar panels on EV's are not for propulsion power but for battery charging during the 8 to 16 hour solar day while parked in the sun, not just the 30 minutes the car is in use. This is for those without a dedicated charger at home. Bob -Original Message- From: EV On Behalf Of Alan Arrison via EV Sent: Sunday, October 21, 2018 7:26 PM To: ev@lists.evdl.org Cc: Alan Arrison Subject: Re: [EVDL] EVLN: The physics of slapping solar panels on cars The numbers don't add up for solar panels on automobiles, never have, never will. This has been proven time and time again. There is no way it gets even 20 miles per kWh under anything but perfect conditions and slow speeds. And the energy from the panels again is under perfect conditions. It is so light because it has almost no crash protection. Al On 10/21/2018 3:09 PM, Larry Gales via EV wrote: When I look at the Stella Lux and Stella Vie, I get very different results from the negative views of solar powered cars. I start with the assumption that the Dutch students who have won most of the solar car records are not actually lying. So, the specs for the 4 passenger Stella Lux include these: Length 178 inches Width 69 inches Height 44 inches Weight 826 pounds Battery Capacity 15 kWh Motor Efficiency 97 percent Range on sunny day (Netherlands) 621 miles Range on sunny day (Australia) 683 miles Range at night (on battery) 403 miles Top Speed 77 mph So, if the range at night is 403 miles and the battery is 15 kWh, that translates to 26.8 miles/kWh. Let us suppose that is under ideal conditions, and that a more realistic value is 20 miles/kWh. The solar PV array is 1.5 kW, so a more realistic value under real world conditions is 0.75 kW. In Seattle, where I live, which has about the worst solar potential in the USA, the average solar intensity in July is 6.3 sun hours. So, (0.75 * 6.3 * 20) = 94.5 miles. If we usually travel only 40 miles/day, I could easily see traveling 200 miles on accumulated solar energy, after, say, a week of 40 miles/day travel. And given that 5 months/year we average over 60% of the July values we can travel about 60 miles/day just on stored sunlight from the car. And the 5 passenger Stella Vie is just as efficient. On Sun, Oct 21, 2018 at 12:09 AM brucedp5 via EV wrote: https://qz.com/1423288/why-dont-we-have-solar-powered-cars-physics/ The physics of why we don’t have solar-powered cars October 15, 2018 Michael J. Coren [image https://cms.qz.com/wp-content/uploads/2018/10/image1-e1539387897807.p ng The Sono Motors Car ] The nuclear furnace at the center of solar system powers almost everything on earth. Photosynthesis, wind, and even fossil fuels (once decomposed living matter) all derive in some way from the star we call the Sun. So why isn’t it enough to power our cars? It’s all about energy density: how much energy falls on a surface relative to how much is consumed. We can have solar powered e-bikes that cover thousands of miles, sailboat drones that cross oceans, even ultra-light aircraft that circumnavigate the globe. What do they have in common? They’re all very light, slow, and consume a trickle of electrons. Solar panels generate just enough electricity to keep them moving. For anything weighing thousands of pounds, like a car, the energy equation is daunting. A few intrepid carmakers are slapping solar panels on their vehicles anyway. Few have gotten very far. The German startup Sono Motors is adding 330 integrated solar cells on the roof, sides, and rear to give its vehicle a 30-km boost out of a 250-km (155-mile) battery range. Meanwhile, Dutch startup behind LightyearOne claims its electric car will “charge itself.” Although it has yet to unveil a vehicle, potential customers can put down deposits for a €119.000 ($157,000) car promising to travel 10,000 to 20,000 km per year (6,200 to 12,400 miles) on its solar panels alone. The Sono Motors Car Will it work? Don’t bet on it, says Jeremy Michalek, a professor of mechanical engineering at Carnegie Mellon University and director of its Vehicle Electrification Group. Quartz asked Michalek to estimate how far the best solar panels could propel a typical electric car on the market. He broke down the math for us. Michalek says ab
Re: [EVDL] EVLN: The physics of slapping solar panels on cars (charging while parked)
My wife and I are on the waiting list for a 220 mile range Model 3. We don't need the 310 mile range or the high performance. When we travel it is usually by motorhome. I've thought about towing the EV on a trailer that is covered with solar panels. A recharge while boon docking would be no problem. BobK On Mon, Oct 22, 2018, 8:41 AM Robert Bruninga via EV wrote: > ALL EV's are predominantly charged while parked. Solar panels on EV's are > not for propulsion power but for battery charging during the 8 to 16 hour > solar day while parked in the sun, not just the 30 minutes the car is in > use. This is for those without a dedicated charger at home. > > Bob > > > -Original Message- > From: EV On Behalf Of Alan Arrison via EV > Sent: Sunday, October 21, 2018 7:26 PM > To: ev@lists.evdl.org > Cc: Alan Arrison > Subject: Re: [EVDL] EVLN: The physics of slapping solar panels on cars > > The numbers don't add up for solar panels on automobiles, never have, never > will. > > This has been proven time and time again. > > There is no way it gets even 20 miles per kWh under anything but perfect > conditions and slow speeds. > > And the energy from the panels again is under perfect conditions. > > It is so light because it has almost no crash protection. > > Al > > > > On 10/21/2018 3:09 PM, Larry Gales via EV wrote: > > When I look at the Stella Lux and Stella Vie, I get very different > > results from the negative views of solar powered cars. I start with > > the assumption that the Dutch students who have won most of the solar > > car records are not actually lying. So, the specs for the 4 passenger > > Stella Lux include these: > > > > > > > > Length > > > > 178 inches > > > > Width > > > > 69 inches > > > > Height > > > > 44 inches > > > > Weight > > > > 826 pounds > > > > Battery Capacity > > > > 15 kWh > > > > Motor Efficiency > > > > 97 percent > > > > Range on sunny day (Netherlands) > > > > 621 miles > > > > Range on sunny day (Australia) > > > > 683 miles > > > > Range at night (on battery) > > > > 403 miles > > > > Top Speed > > > > 77 mph > > > > > > > > So, if the range at night is 403 miles and the battery is 15 kWh, that > > translates to 26.8 miles/kWh. Let us suppose that is under ideal > > conditions, and that a more realistic value is 20 miles/kWh. The > > solar PV array is 1.5 kW, so a more realistic value under real world > > conditions is > > 0.75 kW. In Seattle, where I live, which has about the worst solar > > potential in the USA, the average solar intensity in July is 6.3 sun > > hours. > > So, (0.75 * 6.3 * 20) = 94.5 miles. If we usually travel only 40 > > miles/day, I could easily see traveling 200 miles on accumulated solar > > energy, after, say, a week of 40 miles/day travel. And given that 5 > > months/year we average over 60% of the July values we can travel about > > 60 miles/day just on stored sunlight from the car. And the 5 > > passenger Stella Vie is just as efficient. > > > > On Sun, Oct 21, 2018 at 12:09 AM brucedp5 via EV > > wrote: > > > >> > >> https://qz.com/1423288/why-dont-we-have-solar-powered-cars-physics/ > >> The physics of why we don’t have solar-powered cars October 15, 2018 > >> Michael J. Coren > >> > >> [image > >> https://cms.qz.com/wp-content/uploads/2018/10/image1-e1539387897807.p > >> ng > >> The Sono Motors Car > >> ] > >> > >> The nuclear furnace at the center of solar system powers almost > >> everything on earth. Photosynthesis, wind, and even fossil fuels > >> (once decomposed living matter) all derive in some way from the star we > >> call the Sun. > >> > >> So why isn’t it enough to power our cars? > >> > >> It’s all about energy density: how much energy falls on a surface > >> relative to how much is consumed. We can have solar powered e-bikes > >> that cover thousands of miles, sailboat drones that cross oceans, > >> even ultra-light aircraft that circumnavigate the globe. What do they > >> have in common? > >> They’re > >> all very light, slow, and consume a trickle of electrons. Solar > >> panels generate just enough electricity to keep them moving. > >> > >> For anything weighing thousands of pounds, like a car, the energy > >> equation is daunting. A few intrepid carmakers are slapping solar > >> panels on their vehicles anyway. Few have gotten very far. The German > >> startup Sono Motors is adding 330 integrated solar cells on the roof, > >> sides, and rear to give its vehicle a 30-km boost out of a 250-km > >> (155-mile) battery range. Meanwhile, Dutch startup behind > >> LightyearOne claims its electric car will “charge itself.” Although > >> it has yet to unveil a vehicle, potential customers can put down > >> deposits for a €119.000 ($157,000) car promising to travel 10,000 to > >> 20,000 km per year (6,200 to 12,400 miles) on its solar panels alone. > >> > >> The Sono Motors Car > >> > >> Will it work? Don’t bet on it, says Jeremy Michalek, a professor of > >> mechanical engineering at Carnegie Mellon University an
Re: [EVDL] EVLN: The physics of slapping solar panels on cars (charging while parked)
ALL EV's are predominantly charged while parked. Solar panels on EV's are not for propulsion power but for battery charging during the 8 to 16 hour solar day while parked in the sun, not just the 30 minutes the car is in use. This is for those without a dedicated charger at home. Bob -Original Message- From: EV On Behalf Of Alan Arrison via EV Sent: Sunday, October 21, 2018 7:26 PM To: ev@lists.evdl.org Cc: Alan Arrison Subject: Re: [EVDL] EVLN: The physics of slapping solar panels on cars The numbers don't add up for solar panels on automobiles, never have, never will. This has been proven time and time again. There is no way it gets even 20 miles per kWh under anything but perfect conditions and slow speeds. And the energy from the panels again is under perfect conditions. It is so light because it has almost no crash protection. Al On 10/21/2018 3:09 PM, Larry Gales via EV wrote: > When I look at the Stella Lux and Stella Vie, I get very different > results from the negative views of solar powered cars. I start with > the assumption that the Dutch students who have won most of the solar > car records are not actually lying. So, the specs for the 4 passenger > Stella Lux include these: > > > > Length > > 178 inches > > Width > > 69 inches > > Height > > 44 inches > > Weight > > 826 pounds > > Battery Capacity > > 15 kWh > > Motor Efficiency > > 97 percent > > Range on sunny day (Netherlands) > > 621 miles > > Range on sunny day (Australia) > > 683 miles > > Range at night (on battery) > > 403 miles > > Top Speed > > 77 mph > > > > So, if the range at night is 403 miles and the battery is 15 kWh, that > translates to 26.8 miles/kWh. Let us suppose that is under ideal > conditions, and that a more realistic value is 20 miles/kWh. The > solar PV array is 1.5 kW, so a more realistic value under real world > conditions is > 0.75 kW. In Seattle, where I live, which has about the worst solar > potential in the USA, the average solar intensity in July is 6.3 sun > hours. > So, (0.75 * 6.3 * 20) = 94.5 miles. If we usually travel only 40 > miles/day, I could easily see traveling 200 miles on accumulated solar > energy, after, say, a week of 40 miles/day travel. And given that 5 > months/year we average over 60% of the July values we can travel about > 60 miles/day just on stored sunlight from the car. And the 5 > passenger Stella Vie is just as efficient. > > On Sun, Oct 21, 2018 at 12:09 AM brucedp5 via EV > wrote: > >> >> https://qz.com/1423288/why-dont-we-have-solar-powered-cars-physics/ >> The physics of why we don’t have solar-powered cars October 15, 2018 >> Michael J. Coren >> >> [image >> https://cms.qz.com/wp-content/uploads/2018/10/image1-e1539387897807.p >> ng >> The Sono Motors Car >> ] >> >> The nuclear furnace at the center of solar system powers almost >> everything on earth. Photosynthesis, wind, and even fossil fuels >> (once decomposed living matter) all derive in some way from the star we >> call the Sun. >> >> So why isn’t it enough to power our cars? >> >> It’s all about energy density: how much energy falls on a surface >> relative to how much is consumed. We can have solar powered e-bikes >> that cover thousands of miles, sailboat drones that cross oceans, >> even ultra-light aircraft that circumnavigate the globe. What do they >> have in common? >> They’re >> all very light, slow, and consume a trickle of electrons. Solar >> panels generate just enough electricity to keep them moving. >> >> For anything weighing thousands of pounds, like a car, the energy >> equation is daunting. A few intrepid carmakers are slapping solar >> panels on their vehicles anyway. Few have gotten very far. The German >> startup Sono Motors is adding 330 integrated solar cells on the roof, >> sides, and rear to give its vehicle a 30-km boost out of a 250-km >> (155-mile) battery range. Meanwhile, Dutch startup behind >> LightyearOne claims its electric car will “charge itself.” Although >> it has yet to unveil a vehicle, potential customers can put down >> deposits for a €119.000 ($157,000) car promising to travel 10,000 to >> 20,000 km per year (6,200 to 12,400 miles) on its solar panels alone. >> >> The Sono Motors Car >> >> Will it work? Don’t bet on it, says Jeremy Michalek, a professor of >> mechanical engineering at Carnegie Mellon University and director of >> its Vehicle Electrification Group. >> >> Quartz asked Michalek to estimate how far the best solar panels could >> propel a typical electric car on the market. He broke down the math >> for us. >> >> Michalek says about 1 kilowatt (kW) of solar energy falls on a square >> meter of the Earth’s surface on a clear day. That’s all the solar >> energy available to collect. For a company like Sono, which says it >> can convert about a quarter of that energy into electricity (although >> that’s very optimistic), a full site of panels might generate roughly >> 8 kilowatt hours of energy per day (a best-case scenario with four
