Excursion from San Daniele del Friuli to Grado, for a swim in the sea!

Sun trip tour preparation – June 13
After a 1500 km journey, we are now entitled to a well-deserved rest day, right? Daniele offers me to go to the sea, to Grado precisely. The idea pleases me, here we go, with our solar bikes lightened weight luggage. In the morning freshness, we go on country roads and bike paths. We cross Palmanova, an amazing star-shaped fortified town with 9 branches, surrounded by moats, built at the end of the 16th century. Monumental doors allow us to enter and exit.

Shortly before Grado, we go along the lagoon for several kilometers in a wind carrying marine fragrances. The sea is coming! Swimming and lunch. Back to town pace, pushed by a friendly wind. Stop at Aquileia which was one of the most important cities of the Roman Empire. We admire the Byzantine basilica founded at the beginning of the 4th century, which houses Romanesque frescoes from the 12th century, while enjoying ice cream and pastry ….
Review of the day: 150 km traveled at 27 km / h, charging 660 Wh (the battery remains full!)

Last stage from Oberdrauburg (Austria) to San Daniele del Friuli (Italy) by Tarvisio

Preparation for the Sun Trip Tour 2019 – June 12
After a solid breakfast, we leave Oberdrauburg to attack a small pass. No worries, a few hundred meters of altitude difference, with fresh calves. We leave the Drava Valley to follow a parallel valley. The sun gives and on this road without traffic and flat, we run at a brisk pace. Soon we arrive in Italy, in Tarvisio. Daniele announces 40 km of descent, on an old railway converted into a bike path! And indeed, it's great: we hardly need to pedal. We take our time, we savor the beautiful landscapes! The bike path runs through old train stations. Some are decommissioned, others rehabilitated in cafes. Great, it is the occasion of a contemplative pause accompanied by a tasting of local pastry … The route of this railroad takes bridges a little dizzying. As for the many tunnels, they give us a welcome freshness and plunge us into a mysterious atmosphere. Then, we leave the mountains, we arrive in the plain crossed by the turquoise waters of Tagliamo. I would like to take a break to bathe. But Daniele accelerates, he approaches the goal of this journey, the house of his family in San Daniele del Friuli. No need to fight against this call … Yet I make a short stop: impossible not to stop at the edge of this lake unreal blue! Daniele understands. Finally, in the last rays of the sun, on a place at the top of the city, I discovered the majestic home of Daniele's parents. I realize that we have reached the end of our journey!

From Aicha (Italy) to Oberdrauburg (Austria) via the Puster Valley and the Drava Valley

Preparation Sun Trip Tour 2019 – 11th June
This morning we depart from Aicha, in South Tyrol, Italy, and we ascend quietly to the East, towards East Tyrol in Austria. I have already driven 2 times in this green valley, each time with great pleasure, this 3rd time is no exception: it is an enchantment, a succession of short climbs followed by crossings of meadows, woods, villages .. . We walk along a lake. And snow-capped peaks on each side, as if to guide you, prevent you from getting lost … a pure happiness. Suddenly, Daniele stops in front of me and plague in Italian! What is going on ? Oh I see… we have to cross a ford of 50 or 60 cm of water, maybe more, we do not know. I leap boldly, phew, it's past! But Daniele refuses to pass, he fears for his engine and his battery. He prefers to face the road traffic. He will admit later that it was the most unpleasant road of all his trip: trucks and cars touch to touch, without respite. Daniele and I are therefore road apart for a moment, but no risk of getting lost because now we have the telephone network! In San Candido, we meet a couple of Austrians who invite us to their house for a snack: coffee, beer, brioche … Very nice moment! We finish our journey in an inn in Oberdrauburg, at the foot of the pass that we will pass tomorrow. It was time! A storm of hail and rain is unleashed. Thank you Daniele for having preferred this old inn to the village campsite.

From Innsbrück (Austria) to Aicha (Italy) via the Brenner pass

Preparation of the Sun Trip Tour – June 10
After Innsbrück, the climb to the Brenner pass attacks from the start at 11 or 12%. We advance to 6 km / h and it makes much heat our Direct Drive technology engines (95 ° C for mine!). At times, Daniele pushes his bike to avoid overheating. During breakfast, the sun had recharged my battery and I thought it would last all day. But very quickly, I was disappointed. Further on, we walked along the valley on a really charming road for cyclists, crossing hamlets, meadows and villages. Real roller coasters, steep descents followed by equally steep climbs. While Daniele was cursing, I savored the landscapes. The arrival at the pass was the occasion of a memorable video selfie. The descent of the pass, on the Italian bike paths, was a real pleasure, despite our referral errors and very narrow baffles.

From Wildhaus to Innsbrück via the Arlbergpass: I meet my teammate!

Preparation for the Sun Trip Tour – June 9th
Without a telephone network, we managed to reconnect last night, Daniele and me, thanks to WhatsApp and the WiFi of the campsite. This morning, I drive 40 km to join him and resume our journey together. We will try not to lose ourselves anymore! A few tens of kilometers down the valley then we attack the Albergpass. The landscapes are always beautiful even if the sun is missing. I set the engine assistance to minimum to save battery power. Short appearances of the sun, by chance in the steepest climbs. If it does not give a lot of watts, it at least boosts morale. Snowy landscapes at the col. Then nice descent, the wheels warm up and suddenly, I worry about exploding the tube (it happened to me in tandem!). For a future trip, I may be equipped with tubeless tires or disc brakes … Balance: 172 km, 1500 m of elevation gain, almost 600 Wh of solar charge (so average sunshine).

From Frick to Wildhaus (Switzerland): how do I lose my teammate!

Preparation of the Sun Trip Tour – June 8th
Daniele repaired his brakes at the campsite which had a very well equipped workshop. We leave shortly before noon. A beautiful day is coming: a blue sky, a sun full of watts, wind in the back! We ride together, Daniele on the road, and me on the bike path along the road. Switzerland is full of attention for its cyclists! But sometimes these bike paths move away from the road to join after a village, for example. But all of a sudden, I realize that it's been a while since we've lost sight of each other. Nothing serious, you will tell me, a little phone call or SMS to meet. Unfortunately, it happens today that I change my telephone network operator. So, it was impossible to join us to tell us where we were. I find nice Swiss people ready to help me out: they agree to join Daniele with their cellphone. But Daniele does not answer, I leave a voice message at random (I'll know the next day he believed in harassment advertising!). Further, in a service station equipped with Wifi, I try with Whatsap and email. In vain ! After all these unsuccessful attempts, I resolve to resume my journey. I am the GPS track concocted by Daniele, without knowing if he was in front or behind me. At least we drive in the same direction, on the same road.

The scenery is beautiful, with snowy mountain scenery, scenic bike paths. The day of sun gives a max, more than 1000 Wh, she would have given much more if my battery had not been full by 8am. My 330Wp solar panels work wonders. At the end of the afternoon, I roll by tilting them well to better capture the evening sun. Arrived at a campsite, the wifi and WhatsApp allow me finally to reconnect with Daniele. He is 40 km ahead of me and will sleep in Lichtenstein. Phew, we'll meet again tomorrow morning!

From Lomont (Haute-Saône) to Frick (Switzerland) by Basel

Preparation of the Sun Trip Tour – June 7th
Another excellent day that took us from Lomont in Haute-Saône to Frick in Switzerland. From small roads to cycle paths, we reached Alsace. Change of scenery ! But it was on entering Basel that we really entered another world, with a real place given to cyclists in the city. Awesome! The storm had threatened all afternoon but the tent was already planted when the rain began to fall around 20h.
What ask for more ?

From Langres (Haute-Marne) to the Minicamping of Lomont (Haute-Saône)

Training for the Sun Trip Tour – June 6
After the rain of the night, we take advantage of the morning sun to recharge the batteries while we enjoy our breakfast on the terrace of a bakery. We leave Langres with difficulty: works block the road! We have to be cunning to get around the obstacle. We do not know yet that this is the first embarrassment of a long series throughout this trip through Switzerland, Austria and Italy. Rural landscapes are parading before our eyes. Approaching Vesoul, we follow a delicious bike path through meadows, streams, groves … But then, we face a road with terrible traffic, the N19: cars, trucks, motorhomes succeed one another without interruption. Some are close to us. Suddenly, an exceptional convoy falls back on Daniele who must literally leave the road.  I fart a cable, after 30 km of permanent danger, I want to leave this hell! But Daniele tells me that our ordeal will be over in 2km. I yield. And that's right: in Lure, we find our country lanes so quiet. Happiness ! And, icing on the cake, we find a lovely campsite on the farm, the Minicamping Lomont. If you go to Haute-Saône, I warmly recommend this place! We load our batteries between 19h and 21h, while savoring the meal prepared by the Dutch host who manages this campsite.

From Troyes (Aube) to Langres (Haute-Marne)

Training for the Sun Trip Tour – June 5
I meet my teammate Daniele in Troyes (he left the day before the Paris region). We will go to Italy for a solar bike! In the morning, the weather is gloomy but fortunately the weather will improve throughout the day. For this first day of road together, we cross beautiful landscapes. At times, I feel like sailing in the heart of an ocean of greenery … The GPS track prepared by Daniele plunges us into the heart of rural France, it's great! At mid-day, we start to get hungry but no coffee or restaurant in the small hamlets we cross! But at 14h, surprise in the small village of Cunfin (180 inhabitants): the restaurant ANDION is open! We will not starve today! Thanks to Olivier and his wife for their warm welcome and delicious food! In the evening, we settle in the municipal campsite Langres overlooking the valley: we enjoy a superb panorama before a fiery storm that puts the ground Daniele bike.

Check out the official 2019 Sun Trip Tour jersey!

Rendez-vous from July 6 to 20: a tour of the Puy-en-Velay to Valence passing by the most beautiful passes of Auvergne-Rhône-Alpes .

The operation of a solar panel, by Christophe Dugué

It was during the course of preparation for Sun trip 2019 and 2020, in Lans-en-Vercors, that Christophe Dugué gave us important information about solar panels. In a very clear presentation, he explained to us the design and operation of a solar panel, the definition of its technical characteristics (maximum power) etc…
Christophe also informed us about practical aspects important for solar cyclists: the influence of temperature on performance, the impact of shading, the consequences of micro-cracks in photovoltaic cells…

The solar panels are its domain: Christophe works at Photowatt, a french manufacturer of solar panels for houses and buildings.
And most importantly, Christophe designed and manufactured prototype solar bike panels. These panels are both light and rigid, therefore resistant to the hazards of a solar bike trip. Christophe tested his first prototype during the Sun trip Tour 2017. Then Stéphane Bertrand was equipped for the Sun trip 2018, Lyon-Canton. For the Sun trip Tour 2019, Christophe will also equip his wife who will participate with him.

Preparation for Sun Trip 2019 and 2020

In mid April, the Sun trip team organized a weekend of preparation for the Sun trip. The aim of this internship was to help the participants better prepare themselves from a technical point of view:

  • understand the operation of solar panels,
  • know the different components of a bike with electric assistance (motor, controller, battery…),
  • share experiences from previous Sun trips,
  • prepare itineraries…

This weekend was intense and very rich, as well by the contributions of the speakers: Florian Bailly (creator of the Sun trip), Christophe Bayard (Association Vécolo), Christophe Dugué (Photowatt), Bernard Cauquil (Professor industrial technical and suntriper 2015 and 2020) and by exchanges between participants.
Thank you all!

Here is a video that translates the atmosphere of these encounters:

Follow the Sun trip tour 2019 participants on their social network!

Nationalities of participants at Sun trip 2019 50 participants from 7 different nationalities will participate in the 2019 Edition of the Sun trip tour, from July 6 to 20! Some of us have already met during a very fruitful weekend of preparation, organised by the Sun trip team, in Lans-en-Vercors in April.

Find each participant on his social network or blog: discover his preparation, his expectations, his enthusiasm before the big start…

NomNb pers.PaysSun TripBlogAutreRéseau social
AMORAVAIN Céline, MOCELLIN Pierre & Thomas3Francelogo instagramlogo facebook
ANDREA Gilles1France
ASPE Yannick & CAZANAVE Béatrice2France2015,
logo facebook
BAYARD Christophe1France2017logo facebook
BERMEJO Paul1Maroc2015,
logo facebook
BROCHARD Laurent1Francelogo facebook
BUJADOUX Stéphane1France2017logo instagramlogo facebook
CHATAGNY Laurent & HENCHOZ Corentin2Suisse
CIANI Dario1Suisselogo facebook
CORSELLI Catherine & DURAND Jean-Michel2Belgique
COSANDIER Michel1Suisse
COTTARD Francis1France2017
DENEL Francoise1France2018logo facebook
DUGUÉ Christophe & Stéphanie2France2017logo facebook
FLORET Jean-Jacques1Francelogo facebook
GADOIN Fabrice1Francelogo facebook
GANIVET Benoît1Francelogo facebook
GILLESPIE Ryan & THORESEN Rain2USA2017logo facebook
GONANO Daniele1Italie2017logo facebook
GUILLE François1France
GUYOT Olivier & SCHULZ Norbert2Allemagnelogo facebook
HADIK Stephen1Suisselogo facebook
HELSEN An & Peter2Belgique2017,
logo facebook
IETTER Alain1France2017logo facebook
INACIO Jérôme1Francelogo facebook
KELLER Jean-Claude1Suisselogo facebook
LAGRIFFOUL Claude1France2017logo facebook
LEWIEN Ralf1Allemagnelogo facebook
MACHADO Jean-Louis1France2017logo facebook
OLCHEWSKY Michel1Francelogo facebook
PLOZNER Patrice1France2018logo facebook
RAMBEAU Perrine & VAN NESS Nate2France
logo facebook
ROULLAND Arnaud1Allemagnelogo facebook
RUSSO Fabio1Italielogo facebook
TOUZET Bertrand1Allemagnelogo facebook
TROUCHE Jean-Claude1Francelogo facebook
VAN TIEL Pieter1Suisselogo facebook
VOLLUZ Jean-Marie1Suisselogo facebook

Luc Giros’ solar bike tour of Europe

During the Sun trip 2018, part of Lyon, Mickaël Joguet had put 50 days to arrive in Canton with his solar bike. He won the second place on the podium.
His bike will go back around the world, piloted by Luc giros (30 years old). On May 5, Luc will depart from La Rochelle and depart for an unusual tour of Europe for 17,000 km!

His project is to take out his veil on the three seas but also on the inland lakes. Its route will be along the southern coast of Europe in order to “kitesurfer” on most spots.
Luc will make his journey in complete energy autonomy: thanks to the sun, his bike can pull the trailer carrying his kite.
In addition to the sporting challenge, this journey will also be an opportunity for Luc to evoke his illness, the bladder exstrophy, a complex malformation of the urinary bladder.

Listen again : “my Poitou with Luc Giros 1/5”
Read more about Luc Giros’s adventure

Comparative energy efficiency test of 3 flexible solar panels

After several days of rain, the Sun came back! It is slightly veed but no matter: I was too eager to test the solar panels received three days earlier! I compared them to the panels bought in 2017 and 2018. Although this test has no scientific value, the observations have seemed interesting enough to be published.

Test panels

Solar Panel 50W

Solar Panel 50W

Panel A
specified power: 50Wc nominal
number of cells: 4 x 4 = 16
cell manufacturer: unspecified
cell class: not specified
provenance: purchase from a reputable reseller on internet
price: 2 x €142 = €284 for 100Wc in 2017
Panel B
specified power: 100Wc nominal
number of cells: 5 x 6 = 30
cell manufacturer: unspecified
cell class: class C (visible defects)
provenance: purchase on a famous auction website
price: €135 in 2018
Panel C
specified power: 110Wc nominal
number of cells: 5 x 6 = 30
cells: SunPower™ Maxeon
cell class: class A
provenance: purchase from Linksolar manufacturer
price: €350 (~ 395 USD) in 2019

Measuring the instantaneous power of the panels

Not having a solar energy measuring device, it was not possible for me to measure the actual performance of each Panel. So I chose to measure the instantaneous power of the panels with wattmeters, in the sunshine conditions of the moment. And I compared 2 to 2 the panels connected each to an identical charge regulator charging the same battery.

Measured power with panels B and C

Measured power with panels A and C

Reservations about the test protocol

Various elements could impact the outcome of the measures and their analysis:

    • difference in the years of panel manufacturing, in a context of steady progression of cell performance;
    • difference in State of obsolescence and use of panels: Panel C totally new, Panel B having travelled several thousand km (vibrations + shocks), Panel A of 2017 never used and stored;
    • calibration difference of non-certified wattmeters;
    •  measurements made by veted Sun (repeat the test in other conditions of sunshine).

However, these elements can not fundamentally call into question the results obtained.

Calculations and results

The C Panel being the most powerful, I took it as a reference.  I calculated the ratio of the power produced by Panel A or B to the power produced by Panel C. The table above shows the relative efficiency of panels A and B in reference to Panel C, which therefore has an efficiency of 100%. Pushing the reflection further, I imagined an increase in the surface of panels A or B to get the same power as the C Panel. I then calculated the cost in corresponding A or B panels, and the corresponding panel surface.

Comparative table of the yield of 3 solar panels
NB: I took into account the difference in the number of cells (Panel A: 16 cells, panels B and C: 30 cells).
When observing this table, the following remarks can be issued:
Real power

  • panels A and B have almost identical power while panel A is 2 times more expensive than panel B;
  • the power of panel C is almost double that of panels A and B.

Price to get the same real power:

  • at equal power, panel A is 71% more expensive than panel C;
  • at equal power, panel B is 21% cheaper than panel C.

Surface to achieve the same real power:

  • at equal power, panels A and B occupy 90% more surface area than panel C.

Personal notes

Objective and subjective criteria had guided my purchases:

  • in 2017, I totally discovered the universe of the solar panel, it had reassured me to buy at a large recognized website, the many exchanges by phone and email had given me confidence.
  • in 2018, I wanted to experiment with a low-spread panel format (6×5 = 30 cells) and I had found on the market only these panels at low prices.
  • in 2019, I had the urge and the opportunity to invest in quality equipment, to increase the performance of my bike.


  • A high price is not always a guarantee of the performance of the equipment.
  • Lower yield panels (50%) have a strong impact on the solar bike: less autonomy or increased dimensions. In both cases, this will degrade the rider’s comfort and safety.
  • A higher expense for quality equipment ultimately represents an economy: the value for money is much better.
    Not to mention the other benefits: autonomy, maneuverability, performance…

All about electric bike, by Justin Lemire-Elmore

Justin works in an innovative Canadian company specializing in electric bikes. It creates equipments: batteries, motors, controllers, control consoles etc… Many SunTripers are equipped!
He participated in the Sun trip 2018, with his wife Anne-Sophie, on a solar tandem that he fully invented, where one pedal while the other oar!
Here they are at the Bourget-du-Lac campsite in June 2018:

Justin Lemire-Elmore and Anne-Sophie Rodet

Justin participated in the BC bike show 2019, the largest bike show in Western Canada. In this video, it provides a complete panorama of the various technologies available on the market, their pros and cons… See it, it’s very informative…

Solar panels: the efficiency of photovoltaic cells

This article tries to shed some light on the reader on an important element for the choice of its solar panels: their performance.
For any proposal for enrichment or correction, write to

What is the efficiency of a photovoltaic cell?

This is the ratio between the amount of electrical energy obtained by converting the light energy and the amount of solar energy received by a cell.

Definition of the efficiency of a photovoltaic cell

What is the yield of the cells available on the market?

When I first searched for panels, I read that the yield of this monocrystalline silicon cell was 15%, another 20% and some 22% (in 2017). Today in 2019, the best reaches 25%. Unfortunately, this feature is often absent from the panel specifications.
Questioned by phone, a manufacturer had replied to me: “my company, like many others, is sourcing from a fluctuating international market, we buy lots of good quality but without performance specification. By the way, every delivery, the country of manufacture is different! In this context, how to indicate a reliable data? ”

What’s the difference for the solar cyclist?

With an equal Panel surface, a solar cyclist with high-efficiency cells (25%) will have 66% more energy than a cyclist with low-yielding cells (15%). The first one will be able to drive faster or longer, farther… or make less effort, according to his choice!

yield comparison of different voltaic cells This animation illustrates the impact for the solar cyclist of these differences in performance, it does not have the ambition to have a scientific rigor…
Of course, the solar cyclist can compensate for low performance by increasing the surface of panels. But he knows that this will increase the dimensions of his vehicle, make it heavier, less easy to maneuver…

Yields according to different technologies

With monocrystalline silicon cells, in 2019, the yield reached 25% with the “back contact” technology, in the best panels. With polycrystalline silicon, researchers have succeeded in aachieving a record yield of 22,3%, but this technology is not marketed today (learn more…).

Performance above 30%?
In 2016, German researchers achieved a record performance of 33.3% with a cell called “multi-junction” (learn more…). But beware, you will not find it on the Internet, this technology is dedicated to space applications!
And in the United States, in Colorado, yields of 40.8% are displayed! It makes you dream…. but when will these technologies be available to the general public?

How to choose?

The solar cyclist is therefore tempted to acquire the cells with “high efficiency”. And why not the best of the moment?
Then the question of the budget arises! As you will have guessed, the higher the performance, the higher the cost. Unless you have a very generous budget or partners, the solar bike Designer will have to make choices, and most often, compromises!

Each one must first identify its needs, define its priorities in order to determine the optimal solution for its project. He will be able to equip himself with full knowledge of the cause.

How to choose your solar panels?

flexible solar panelPhotovoltaic panels are the key element of the solar bike: they convert the energy of the sun into electric energy that can be used directly by the engine and/or for charging the battery. When we start the adventure of building his solar bike, we are a little lost in front of the diversity of offers.

I will therefore share here several elements that can guide you and allow you to make a choice with full knowledge of the cause.

Flexible panels or rigid panels?

flexible solar panelFlexible panels: this is the type of panel most frequently used for solar bikes. The reasons are their lightness (from 3 to 5 kg for 200W) and the good energy efficiency of the monocrystalline silicon cells that compose them (ratio between recovered electrical energy/solar energy received). More often than not, a supporting structure of the panels is added that rigidifies and protects them. In fact, every shock on a cell decreases its performance locally. With multiplied shocks, the total power of the panel decreases significantly and permanently. That is the weak point of flexibility.

rigid solar panelRigid panels: they are sturdy, weatherproof like hail; they are planned a priori for a building installation. They are very heavy (15 to 18 kg for 200Wc). Their photovoltaic cells are often made of polycrystalline silicon with less energy efficiency than monocrystalline silicon. For these reasons, they are rarely used on solar bikes.

One exception, however: Christophe Dugué, who works at a French manufacturer, has built himself a rigid panel and light, monocrystalline. He experimented with it during the 2017 Sun Trip Tour. Stéphane Bertrand was also able to benefit this prototype during the 12,000 km of Sun Trip 2018. This summer, no doubt we will see these extraordinary panels again since Christophe Dugué and his wife participate in the Sun Trip Tour 2019. Unfortunately, these panels are not yet marketed.

The electrical characteristics of the panels

The power of a panel is proportional to the number of photovoltaic cells that compose it. The photovoltaic cell is the basic unit of a panel, it produces an electrical power of the order of 3 Watts under a voltage of less than 1 volt.
The electrical characteristics are mentioned by the manufacturers. The main features are the operating voltage (VMP in volts) and the maximum current in the event of maximum sunlight (IMP in AMPS). Depending on the Assembly of the cells, in series and/or parallel, panels of the same power may have different operating voltages and maximum currents.

Daniele Gonano salon auto Paris 2018The designer of a solar bike is therefore faced with an equation with many parameters influencing each other:

  • selection of the panel surface for the desired total power,
  • choice of dimensions and where to install them according to the type of bike,
  • serial or parallel installation depending on the solar controller (voltage and current),
  • choice of type and number of regulators (MPPT boost or not).

Solar panel photovoltaic cells

Two main types of cells can compose the panels. For a solar bike, because of the higher efficiency, it is the monocrystalline silicon that is most appropriate.

monocrystalline silicon cell Monocrystalline silicon cells
-very good yield, about 200Wc/m²
-lifespan of ~ 30 years,
-higher cost than polycrystalline silicon.
polycrystalline silicon photovoltaic cellPolycrystalline silicon cells
– yield of about 150Wc/m², thus less than monocrystalline,
-lifespan of ~ 30 years.
-cost more economical than monocrystalline silicon.

But it all depends on the user’s needs: Barnabas Chaillot, met during the prologue of Sun trip 2018, made the most economical choice [read more…].

The quality of photovoltaic cells

The performance of a panel depends on the quality of the photovoltaic cells that compose it but few panel manufacturers mention the “class” of the cells used. It strongly impacts the cost of construction of the panel, and therefore its selling price. For our use, three levels of cell quality are available:

class A photovoltaic cell“class A” cells: they are of very good quality, without visible defect and their electrical characteristics correspond exactly to the specifications defined by the manufacturer. The solar panels built with this cell class are therefore the most expensive.
“class B” cells: they are of good quality and have little visible defects. Their yield is close to or slightly lower than the “class A” cells.
class C photovoltaic cell“class C” cells: they show visible defects that affect their performance (e.g. chipped, cracked cells…). Their performance is obviously less good, these cells are used to realize the economic signs.
“class D” cells: they present breaks or are incomplete. They can be resized to produce in smaller sizes, but most often their material is recycled to make new ones.

More… All about the performance of photovoltaic cells!

Second test of my new solar bike

Today, the wind conditions were more favourable than last Tuesday, however the Vered Sun of the early afternoon provided less energy. By adjusting the engine power to 100W, I drove at an average speed of 31.5 km/h on a 90 km course with 650 m of positive elevation.


First test of Solarduino Bike 3rd version

Yesterday I experimented with my new solar bike! It is made up of a classic bike and a motorised trailer. I built this new trailer in order to support 3 solar panels of 100Wc (I only had 2 last year).
My intention is to increase the length of my courses. With 2 panels last year, I had completed courses of a little more than 200 km. With 3 panels, I now hope to exceed 250km per day.

For this first 2-step test, I travelled a total of 129 km with 1080 m of elevation gain in 4h25. My average speed was close to 30 km/h.

Due to the sunshine conditions, I set the electrical assistance between 90W and 115W with short moments at 225W.
In quite unfavourable wind conditions (wind of 20/25 km/h with brutal gusts at 50 km/h), I was able to appreciate the good behaviour of the trailer, very stable in turns of the road.

The course of the Sun trip Tour 2019

Discover the route of Sun trip tour 2019: a solar bike route that crosses the Auvergne-Rhône-Alpes region, from Puy-en-Velay to Valence, via the Monts d’Auvergne, Vulcania, Divonne-les-Bains, Chamonix, Val Cenis, Pinerolo (Italy) and Crest.
50 adventurers propelled by solar energy to attack the most beautiful passes of France!

Sun Trip Tour 2019

a project in partnership with EDF, EDF renewables, the region Auvergne-Rhône-Alpes and GEO.fr!