Sono Stories: Solar Integration Testing | Sono Motors

Hi, I’m Gladys and I’m in the Marketing team at 
Sono Motors. Join us for a wild ride of testing! We’ll be testing test tracks with the new 
SVC, driving; ins and outs, ups and downs, We’ll do some solar testing and I’ll 
be conducting my own little experiment.   So tune in, enjoy and see you soon!  Hey everyone, my name’s Dominik and I’m 
responsible for the power train at Sono Motors.  My name is Markus and I’m responsible for 
the Vehicle Control Unit. I'm working for   Continental Engineering Services and today we 
are on the system test track in Regensburg,   where we're going to test your vehicle.
-Yes, exactly. We’re going to test the   Sion. We’ve done so for the last week 
and collected the results, and yeah.

Furthermore, we can go up to 180 kilometers per 
hour here on the track, we can make sure that   the vehicle doesn’t over speed. And yeah, 
this is what we're done over the last week. Yeah, exactly. We tested from zero, that is, in 
a state of charge up to 100. We tested all of the   ranges and it’s very cold this week so we 
had a little bit of winter testing as well. This is why we’re here, this is why we built 
the prototype – to learn from the prototype   and the longer the list is, the 
better the next generation will be.  -Exactly, yeah. And today Sebastian Böttger, 
a community representative,   is joining us for the first Sion test drive 
and we’re looking forward to get some feedback! -Good morning Gladys! Hello, hello.
-Where are we going? We’re going to Roding and that’s 
where our prototype is being built   and now that it’s done- pretty much 
done- we’re doing some testing today.

So today is solar testing. The sun 
is looking decent. It’s still cold   but decent. We’ll do testing on the roof. 
I think it's gonna be really nice to see. Hello, we’re at Roding and we’re here to do more 
testing on the SVC 2. Development told us that   there is great improvements on the 
functionality of the solar panels.   So we’re here to check them 

I’m excited, let's go. Apparently, it’s supposed to go straight back up. I’ll hold your neck and then I’ll kind of-  -Oh really?
-push it quite deep into your brain. I can’t do it! Too much! -Perfect!
He just… …broke my brain! Who's had the worst reaction so far? -You, Gladys.
Really? That’s annoying. Christian that's your test.
Seems to be negative as well. Christian, hello hello.
Hi Gladys.  For the viewers at home, this is Christian, 
he’s a project lead on the solar electric…help   me finish, please…You can start with solar 
electric vehicle, but I'm focusing on the   electric integration of our solar technology.
-What I said, perfect! So what brings   us here today? I know I have to do some solar 
testing but can you give me the lay of the land.  Absolutely, so I have prepared the 
vehicle and the solar integration   to do some end-to-end tests today.

We have 
beautiful conditions outside, the sun is shining.  It’s winter time and the sun is a 
bit low but still intense enough   to show the results on the screen. Ok, very nice. So, there are cells and there’s 
a battery. How is that getting from A-B,   from solar to battery? From A-B, of course, you need wiring. The 
wiring from the panels go first, to the MCU. -MCU? -MCU is short for MPPT Central Unit. MPPT is again an acronym that is well known for 
Maximum Power Point Tracking. It makes sure that   the power gets most efficiently to the battery. -Ok, very cool.
-We have several body panels with solar   cells integrated. Each group of cells, you need 
their own MPPT to make the system run smoothly. Ok so, I know that today we're only 
testing the functionality of the roof?   How come? Why not everything? Well, you gotta start somewhere.

We start with the 
biggest panels. They should, even in winter time,   deliver enough power to see an impact, to 
make the system wake up when we drive from   this building outside into the sun. At the same 
time, the biggest panels also involve the biggest   challenges for us. A lot of mechanical stress on 
the cells but we’re really proud of the result. Yeah, it's looking beautiful and I’m excited 
to see how it works. I'm looking forward. Tell me more about some 
technical things and some specs! One technical detail I’d like to mention today is 
that we’re using half instead of full cells. You   might remember from previous designs that the 
solar cells were square. For this prototype,   we chose for the first time, half cells.

PV industry is moving towards bigger cells   and in order to be more 
flexible on the body panels,   to place the maximum amount of them, 
and to increase system efficiency,   we chose half cells for now. For increasing 
the efficiency, it's done in two ways. First of all, you have more cells, they are 
smaller so you have more space for more of them,   and thereby you increase the voltage. We might 
get to this later when we speak about the MCU in   more detail, it increases 
the converting efficiency. The other aspect is that you are basically 
reducing the current, which might sound like   less power. But if you have the product of the 
voltage and current, power will be the same,   but the lower current produces less losses 
in the wiring to the battery and MCU.

-Okay, very efficient then! -These are three main advantages 
to using the half cells. And I think they look nice! It’s like the size of   an iPhone, a bit.
– A big iPhone.  Can we get it in action? 
Let’s go get that roof tested. I’ll meet you in there. Beep beep, you might get 
hit over there. Seatbelts! Ich   spreche deutsch.
Do you like Maultäschle?  Nein  -No Maultäschele for you?
Maultäschle… Maul-täsch-le. Oh those roll thingies with the meat inside?
-The Swabian tortellini. Yeah the pasta with the meat in, no! Hello.

I’m here today to 
do my own experiment. Yes,   I know that development is 
doing such beautiful, hard work. They’re shedding their blood, 
sweat and tears for this car, but   I just need to see it for myself. 
I’m here today to really test if   the solar – what is it?
-Intergration… Yeah, the solar integration, if the solar 
panels are really absorbing the sun and if   I make my own shade will it 
slow the intake of the sun? So, Christian I’m going to give you this black 

Let’s do it together and a couple of times   because…I don’t trust it. I can’t reach so 
Christian you gotta do more! Thank you so much. -Like this? Ok, yep. thank you so much – I’ll let you do that. 
I’m going to check it out for myself. I don’t want   him touching the car other than this, you know, 
I just don’t want that- I need to see for myself.  Ok.
-Should be off, isn’t it?  -Yeah! It is!
So, it’s been   sitting out in the sun for about an hour and 
we just covered it with this black blanket,   representing shade in my experiment, and it’s 
gone to 0 watts.

Ok, so things are going well,   but now I want to see you take it off 
slowly- just slowly. Expose a little. -Mhm let’s see. -The front part…-  Ok you’ve exposed half and I’m still 
waiting Christian. Oh – 40 – 75 watts, 76 -So fully uncovered now.
-113, 114… And it’s not 200 because we’re 
not what, because it’s winter?  -Because its winter and the sun is low-
-The sun is low ok, ok. Beautiful, ok, so um.   Even with creating my own shade, the roof is 
fully functional and my experiment is a bust. So, Christian just give me the 
blanket, this is embarrassing.   I thought it wasn’t going to 

Cool. Um, thanks Christian,   you’re doing great work. Keep it up, development 
is loving it. I’m just going to go back to Munich. -Thanks for being here!
-I shouldn’t be into sci- Not a scientist. Yeah, so right now we have almost 470 watts per 
square meter. That’s the irradiance from the sun,   in that position for the panels, 
Max is holding the sensor.   If I press those buttons, I get the 
immediate results, This is showing   24 watts for the smallest panel. As expected. Yes, 
that’s only one panel. Should be the smallest. -I’m not a scientist. Hey everyone, thanks for watching. I hope 
you enjoyed yourselves and learned something.   I definitely enjoyed myself and learned 
a lot of things.

We, as you remember,   were able to see the test track and how the car 
handles. We saw the solar panels and how the roof   interacts with the sun and how it’s visualized 
on the infotainment system. Those were awesome   results, we saw what we needed to and – alright 
alright alright. Until next time guys see you. Do I sit here? No,
It just was natural.  Masks. Indoors, in cars..

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