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Third year of the Solar vehicle - Dőry István PhD - Edutus University of Tatabánya (Hungary)
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I greet the dear participants with respect on the solar mobility report.
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I'll show you the 2020 data of the Tatabánya-based (Hungary, Europe) Edutus University's
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so-called "Solar Snail", a solar vehicle.
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Right on the first page you can see a quick summary:
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all distance traveled in the first year was only 4768km,
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then from 5013km it went up to 5073km by the end of 2020.
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Maximum distance traveled/day with the solar vehicle went
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130km from 103km.
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This solar vehicle was built
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in 2017's event "Researchers Night"
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Then in worked fine, but since it just won't stop!
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In summer camps it carries equipments,
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even more, in this particular camp
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that one of the kids had an asthma attack, didn't knew where it's pills were,
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so I asked if we would go back to the camp site
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so we jumped into the solar vehicle,
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went to the school, found the pills, while the ambulace arrived, the kid got better.
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The solar vehicle look like this,
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you can see a big luggage compartment, a boot which is covered with 3 solar panels
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and a small cab. It's a full-electric chinese
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ice cream car was transformed for
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the 2017 Researcher's Night for solar purposes.
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Now I'll tell quickly what you should know about
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this praticular Solar Snail. Here you can see
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as the students assembling it together. A total of 17 students took part,
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so an originally low conspumtion electric car would have solar energy.
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This is the central computer under the seat,
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by the ELTE Informatics Faculty of Szombathely (Hungary),
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with the help of Dr. Gál László and a few students.
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it measures the main voltage and four currents.
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It combines them with the GPS and time coordinates.
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This report was based on these data,
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collected by the main computer in three years.
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Most importants data here, it's a yearly report of 2020.
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The voltage drops in the winter, but not because
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it's cold, insted it really drains as used, so it takes
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weeks as it's fully charged up again, but as spring comes it gets better,
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instead it can go 20-40km in a few days,
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usually with a useful activity.
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Another important chart with any solar vehicle
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if you have one, that it starts from zero
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with 2-4 volts
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with 1,5-2kWh the voltage raising by every day
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but as it's in motion the energy drains on a slope.
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around 15km is equal 1 volt and 0,4kWh,
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so if someone goes to a 70km distance,
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voltage is dropped by 3, and after 130kms by 7-8 volts,
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from the starting point, even if the Sun shines.
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This means the approximate range of the Solar Snail.
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This is provided by the Sun.
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You can see that there's 1-2kWh of electrical work each day. Yearly average is 1kWh a day,
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in summer about 2kWh in winther under 0,5kWh of electric work.
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This can be compared to a combustion engine's 1litre of gas
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which is 10km by average is 10kWh,
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so the average vehicle consumption of energy is 30-40 times more.
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And this energy is even not produced by themselves.
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The Solar Snail produces this energy the it's panels
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it's own energy and consumes it.
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This means it carries Saudi Arabia on it's back
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wars didn't have to break out for the energy.
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A few from the solar vehicle's annual
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special data here.
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Average charge is 39km, which has
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+/- 12km as if it's being charged or used.
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From electrical network it can't be used at all.
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It can only be chareg by the sun even in motion.
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Energy efficiency is 5 litres, but not under 100, but
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1000km. It is even not consumed as it produces it's own
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from solar energy. Cost effectiveness is also good,
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highest point ever was on 700 meters of Írottkő,
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Kőris-hegy in Bakony mountains, also around 700 meters.
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Farthest distance was 130km, it was taken under 6 hours
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So you can see the Solar Snail's speed is really like a snail
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it's not really high: 24-25km/h.
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Usually it discharged two times a year, these are
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predicted, planned discharges, so it really
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drives a lot, it carries load
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sometimes it's fully discharged and remains on the site. This year
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01.12. Röjtökmuzsaj and 05.13 Répcelak was sites of full discharges.
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There are exceptions. Usually it comes back
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usually it is charged. If the Sun really shines, it can take
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a 130km trip.
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Since it has the main computer, we can precisely monitor the output
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the charging and the engine outputs as well.
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biggest charging output ever registered was
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626,9 Watts on 20th of May 2020
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midday, for only a minute. It needed a cool may
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a bit of wind, an an intense shining
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under the clouds, so a sudden energy charge could came up.
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Three years story: the km/day datas
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and the kWh/day datas fluctuating together.
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Now here's an experiment:
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Comparison of the Solar Snails milage with a Nissan Leaf's one.
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It turned out, that the Nissan Leaf's minimal consumption was doble times the Solar Snail's consumption.
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So, this was when the Leaf was really slow.
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When it was used in normal conditions, consumption went up to 3-5 times the solar vehicle's.
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And if you compare the solar one with more traditional cars,
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those consume 20-30 times more.
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Fun fact, that when the vehicle is stopped,
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the Nissan Lead shows peak consumption, because
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on that "distance" it does not move, but it takes 800 Watts to
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heat it's battery and run the computer.
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But when the Solar Snail stops, it is more likely to charge itself with 80 Watts,
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so it's consumption can turn into a negative area.
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Only a 10 minutes of rest makes another kilometer free.
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This is the main computer's screen
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with the speed, engine output, charging output.
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This 385W splits to the left red line,
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as left side solar panel, white line as the top panel, and
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the green line is the right panel, and as the sun shines from the left this last one is barely visible.
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The 1470 Watts can be seen, at the last two seconds
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there were 1470 Watts, but 20 seconds before it was even at 2500 Watts, or
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there were even an amount of zero.
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Distance traveled, elapsed time, remaining energy, inner resistance is shown.
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Also nominal voltage.
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I'll also show you a video, as the Snail moves,
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how this graph is taking shape, how these numbers change.
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Just a little physics:
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as the Solar Snail starts, voltage is dropped by 3 Volts, and after
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that, regarding to the distance traveled, energy consumed,
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by these numbers at the top as you can see,
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voltage is constantly dropping. As the Snail stops, depolarization happens.
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This is only the batteries taking a breath, not the solar energy charging.
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Then, after several hours, this value rises higher and higher.
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This was trip done in a few days, around 150 km distance traveled.
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The Solar Snail gone through the river Rába, to a zoo, beach, several towns as for shopping,
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this is roughly the Solar Snail's summer performance.
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These two day's story
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is shown as many accelerations,
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stops happened. Both days. The first day there barely were
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any drops on the voltage, but the other day it is constantly decreasing
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despite that under these days around 5kWh of
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energy whas charged by tha panels.
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But from this amount it also consumed 7-8kWh,
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because it also consumed the energy stored in the batteries.
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This is a parking, very useful information collected: the Solar Snail is set to
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a southern orinetation: top panel's graph's like a sinus wave,
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as performance rises and drops. At the beggining, Sun shines from the right side,
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after that it ascends to the left, and shines from there.
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Here you can see another parking car going away with his shadowing effect to the side panel.
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This also shows that you have to park well with the Solar Snail. Luckily
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in summer, everyone wants to hide from the sun, but the
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solar vehicle stands on it.
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These are night shifts: on the summer camp
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previously shown there was a shift every night,
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it had to move loads from here to there and other stuff,
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so you can see that nothing can be seen:
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by the night it work just as fine as by day, just doesn't charges.
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A day after, it gets charged. This nice
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sewing machine pattern is four same turns with the vehcile, when 2-2
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beds were transported by the Snail. Here it accelerates,
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decelerates, and there were loadings of cargo.
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Solar Snail's ecological footprint from the transportation industry. A very interesting topic.
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What are we using for transportation? Some takes cars,
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other train, bus. A pretty big amount of
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pedestrians can be shown, but with little energy needs.
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but I did 150hours of walking, which has good effects
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on my health as well. I saved around 40.000 HUF of
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medical costs, for instance.
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With biking as well, one can go economical with simply moving.
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Besides these, the Solar Snail consumes,
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but not that much! 360kWh in total.
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Even with amortisation, annual mileage is around 120000 HUF,
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including the solar panels and the vehicle body.
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The train is even more cheaper, but just because I get 50% off the price,
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also the bus has a very short value here
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but I only took train replacement buses.
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What is driving? Driving looks like
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100km done this year. I don't have one, but took a taxi to get some solar panels
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those already fitted and doing it's work on top my daughter's house.
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These 10 panels took one ride, and 20kg of Carbon Dioxide polluted into the air.
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But it could be two tons. Average
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car useage could emit tons of Carbon Dioxide.
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This can be compared to planes, also very high
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if someone takes plane, and electric bike, which has very small pollution.
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With all these, around 200kg of Carbon Dioxide emission was made
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But around two tons spared, not having the car
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and the plane. So the Solar Snail and walking
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biking and traveling by train does a very good service to the environment.
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I wanted to show that.
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This is the Solar Snails economic return. You can see
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that it has some gain: 49 HUF/km
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as it's operation consumes 26HUF/km. It is worth
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comparing what happens with cars: 80HUF/km for operation
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even with amortisation and energy. So the Snail really
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makes profit. By car there're very few freights, that
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whose making more profit than 80HUF/km.
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So when it's not just used for a status symbol purpose,
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for instance a theatre, where now
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only one third or none of the previously placed could be sold.
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As there thoughts go even farther, let's just see
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what it takes for the transportation from all the energy consumption
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or the Solar Snail: it's 60-70 Watts, including the
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train, cycling, electrigc bike and also
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the solar vehicle.
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The Solar Snails with it's average of 40 Watts.
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You can also add the rides by horses or any other transportation methods.
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You can choose several.
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Monthly milegas shows the same graph. This year in the spring time there were
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some relapse. Because of the pandemic one could get to fewer places.
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But july went very well. The Solar Snail went to Tatabánya
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solar panels were changed. Not because they had to, but
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for measuring purposes. On this vehicle
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we're doing expmeriments. One of them is changing two panels,
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and we're measuring those now.
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There's a gallery of places visited, if you want more, you can check the Solar Snail (Napcsiga) facebook-page.
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Theres more than a thousand pictures. It's just an interesing one: this is how's Austrian border
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is closed, but you can cross it with this solar vehicle.
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This is some rest taken at the lake Balaton.
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You can have a stop, having internet connection with a computer,
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very pleasant interior and also casts a shadow
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as the side panels raised.
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This is at the Tihany ferry, here's some peaches loaded.
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This is Budapest with a pretty low amount of light, because of the tall houses.
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Those cast big shadow. We were to attend an award ceremony.
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This is a demontration, also in the capital city of Hungary.
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This concludes the presentation. You can have more on the NAPCSIGA facebbok-page.
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Thank you for listening! Hungarian Science Festival - 2020. november
