We reported last week that the Acer Aspire S3 had turned up for pre-order in Italy at €799. As expected, it’s Aspire S3 available for order in other countries too and for those of you that like to order through Amazon, it’s now available in the German and Italian stores. Again the price in €799 which undercuts the cheapest Apple MacBook Air model by at least €40 but there’s still no availability info.

One thing we found out this week that there are no Ethernet or VGA ports on the device despite many specifications lists, including some early Acer specification lists, highlighting this capability. This could be important to you. [Confirmation comes directly from Notebookitalia who kindly took our query to their local Acer contact.]

I’ve linked Amazon on our the Acer Aspire S3 information page for those of you visiting from Germany or Italy. As I find other Amazon country availability, I’ll link the relevant stores in so check the database regularly.

There’s nothing more fun than walking from mobile phone shop to mobile phone shop trying to work out what exactly is going on in the market. For a start it’s shocking to hear the differences in opinion between shops of the same ‘brand’ and secondly, none of them have a clue what’s going on with their own websites let along what’s happening in the market. Questions about the Motorola Milestone today were met with that millisecond pause that tells you that what comes out of their mouth is going to be bullshit!

What I did discover is the following (that will only be of interest to Germans, that can read English. (note-to-self: Maybe widening your niche area might result in more visitors!)

As I went from shop to shop I tweeted my findings:

Vodafone and 02 have confirmation that the Droid / Milestone is coming. I’m a Vodafone customer who’s contract finishes in Feb so this is interesting to me but there’s something even more interesting.

O2 have an interesting ‘transparent’ system where they’ve separated the phones and contracts into different products. A phone is free and costs 5,10,15 or 20 per month over 2 years. It allows them to sell voice and data services on a month-by-month basis. You can combine multiple products in different ways which benefits someone like me who rarely makes a voice call but is connected to the data channel for most of the day. I’ve been offered a Motorola Milestone/Droid for 20 Euro per month / 24 months (480 Euros) I can then add a 0 Euro per month voice contract. (0,15 Euros per call/sms) and then (and this is the cool part) add a 300MB or 5GB HSPA (in Bonn) contract on for 10 or 25 Euro per month. (Actually they are both flat rate data but throttle down to GPRS after the limit is reached.) For 45 Euro per month I get a Droid and 5GB of lovely 7.2mbps data. Vodafone, you’ve got about 5 days to offer me something else because apparently the Milestone/Droid will be here next week.

Other updates: Amazon have one weeks exclusivity on the Nkia N900 in Germany. Nokia shop gets it one week later. (Should be under 2 weeks)

I didn’t get a chance to talk to the T-Mobile people about the HTC HD2. It’s coming soon and it looks like it will be exclusive to T-Mobile for a while as no-one else knew anything about it. The T-Mobile shop was rammed full so I left. Maybe I’ll check them out again later.

I spotted the Omnia Pro B7610 in a few shops and spoke to one person about why it took too long to reach the shelves in Germany. ‘Germany is a different place’ he said. ‘Everyone else is casual about faults but it’s different in Germany.’ I had to laugh out loud because it’s so true. The Germans are the best quality control testers in the world!

It’s funny how a walk around the shops results in a different conclusion to browsing the web. There’s an extra special element of excitement that can catch you unaware. Right now I’m seriously thinking about the Milestone for next week. If I get it I’ll start a sub-blog droid-milestone.carrypad.com My only worry is that I will end up with a QWERTZ keyboard.

One year ago (see this post for details of the 2007 Solar UMPC tour kit,) I was using the setup below for my mobile blogging and tracking.

This year, its a lot simpler. And a lot more powerful. Notice how the phone, GPS tracker and Camera have merged into one device. Yes, the N82 is a real boon. The N82 camera is not as good as the S2  (as expected) but the ability to auto-tag while tracking and then post the images directly to a server over the Internet is a massive advantage.

You’ll also notice a change in UMPC. I’m now using the Samsung Q1 Ultra (with XP and HSDPA) which has an SD slot (negating the need for any cables for the camera) and a much brighter, higher resolution screen. I’ve also moved to SSD rather than the traditional, spinning hard drive. Its safer. The keyboard (A Samsung Q1 keyboard) remains the same as there’s still nothing out there that can beat it. You’ll also see the USB LED lamp. Still, a key part of the kit!

Now lets look at the solar setup. This is the setup I used a year ago.

And this is the setup i’m going to use over the next four days while I go work/camping.

[The Wife and Kid are off camping together and I was due to stay home and work but I’ve decided to come along and make a working holiday of it. Dads – this is the beauty of Ultra Mobile PC’s!!!]

I’ve removed the lead acid battery from the kit and am now direct charging the Tablet Kiosk MP3400. It only charges during peak hours (one full charge per 100% sunny day here in mid-summer Germany) where the SLA battery charges during less sunny periods but the amount of energy you get in those few extra hours is minimal. I’ve chosen to drop the SLA battery and use the MP3400 direct on the Sunlinq 25W solar panel.

Here’s a post with more detail about using the two together. And a how-to video.

I’ll probably post a few solar computing thoughts while I’m away so stay tuned here for more. Weather is looking good!

 
Last year on the Solar UMPC tour.

When I did my first tests and calculations about the use of solar power to drive a PC I was quite amazed at the inefficiency of the process and today’s ‘laboratory conditions’ test proves just how much room for improvement there is. It’s thanks to devices like UMPCs that this is project is at all possible because I really doubt it would have worked with even a ‘power saving’ notebook PC.

Today I stayed at the campsite and put the Solar panel and Li-Ion battery through a 3 hours test. Its was a cloudless day with a very thin haze, 22 degrees centigrade and for reference I’m located at about 50 degrees north and 7 degrees east. The date is the 30th of August which is heading towards Autumn here in Germany. The test was done from 11:00 – 14:00 and I took the empty Li-Ion battery and charged it with the solar panel for 3 hours.

I estimate that about 1.2KW of energy hit my 7000 cm2 panel with about 660W falling on the Solar cells (3500 cm2). After conversion to electricity it created about 50w/hr of energy. Of that, about 40W was taken by the Li-Ion battery because it only uses a fixed current and voltage. It won’t adapt to the power available. Due to input voltage conversions and charging losses, this left me with an estimated 30W of energy and after taking this through yet another set of voltage conversions and charging process, left me with a rather poor 18W of power. Of course this is enough for a few hours of work but isn’t it incredible that so much power is wasted (or rather passed back as heat!)

I spent the rest of the afternoon trying to work out how this process could be improved and I’ve come up with a list of ideas that could help. I’ll talk though them in the next post but right now I need to put some more cream on the back of my legs because through all the concentration I forgot about the sun and I’ve burned the bit right behind the knee. That’s going to be really enjoyable tomorrow when I make the 70km dash to Bonn.

Here’s a diagram I created quickly on the Q1b. Hopefuly it makes things a bit clearer. How would you improve the architechture?

I made it down to Karlsruhe in Germany after a quite stressful train journey with the bike and all the kit and after a short journey that turned out to be a 2.5hours trek to the campsite. I just managed to get the tent up before it got dark and I had to dive straight into the tent though because there are thousands of hungry mosquitos here.

After spending an hour trying to organise my kit inside my one-man tent (I gave up) I finally settled down with the local radio playing on the mobile phone and the Q1b lit by my USB led lamp. How nice!

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It was an early start yesterday. 0445 rise and bus at 0530. 5 hours later after three trains and another bus I arrived at InterSolar 2007 in Freiburg, Germany hoping to find out how I could improve the UMPC Solar kit at Europe’s biggest solar expo. Unfortunately, there wasn’t much there for consumers at all. It was all 200w, $1000 panels and huge thermal heating set-ups. I saw one company that was selling the Voltaic Solar Backpack but I’ve already assessed this product and at 4W max output, its not powerful enough. I was rather hoping to see someone with the Reware Juicebag which, at 6.3W is much more useful.

Actually the most interesting thing that happened yesterday, apart from some awesomely stormy weather, was that the train journey took me on the Rhein route south to where I will start the Solar UMPC tour. Its a gorgeous route. Lovely scenery and I saw loads and loads of great Rhein-side restaurants and camping sites. I’m looking forward to the tour more than ever!

One bit of relevant news from yesterday which came through RSS and has spawned another bit of research was that Sanyo have broken the record for a production solar cell. We’re up to 22% now. In theory, the cell on the left here, a 10x10cm device, should be able to generate over 2W. 100cm2 is about the same area as the face of a UMPC. 4W is the target average power consumption that Intel have set for devices based on Menlow, their UMPC platform for 2008. The interesting thing that I’ve found out is that this cell (or at least the previous version of it) appears in the Sanyo Eneloop solar charger. The charger houses a Li-Ion battery which can store enough energy to charge 4x2000mah batteries. That’s about 10W if my maths is correct. The only problem is the quoted 6 DAYS charging time for the internal Li-Ion battery. I suspect that the cell isn’t exactly being used that efficiently because as I said before, that 10×10 cell should be able to kick out 2W, enough to charge the batteries in a few full days of sun. This little bit of tech will set you back over $150. Eek!

Lesson number one in the Solar-UMPC project is that the weather is chaos and if you live in mid-northern Europe, you can’t rely on it as a source of instant energy. You’ll see how I’ve had to adapt my solution in my first Solar UMPC video. In the video I present the solar charging and storage setup that I’ve decided to use for the tour. Its based on the fag-packet drawing I did a few weeks ago after deciding that Li-Ion batteries weren’t really the best solution.

I’ve introduced the lead-acid battery as a buffer and despite the 100-year old technology and 2.6KG weight, provides the perfect stabiliser to the whole architecture.

A quick rundown of the equipment I’m using (mostly bought from my home country, Germany.)

• Sunlinq 12v / 25W foldable solar panel.
• Sonnenschein 12v / 6.6Ah lead-acid battery.
• Solar charge controller. 12v / 4A
• Samsung Q1b UMPC.
• TabletKiosk MP3400 Li-Ion battery pack.
• Voltcraft dual-mode 12v battery charger.
• Voltcraft 12v DC-DC adaptor.

More pictures in the gallery here. Many thanks to SelectSolar for their help in preparing this solution.

The weather is still bad here in Germany and there’s no chance of getting reasonable testing done on a solar panel at the moment. The forecast is also bad so I’ve decided to send the test P3 panel back. In the very short time I was able to test it I was able to learn a lot though and its given me some thoughts about how I will move forward. This post goes over some of the stats, figures and calculations so its not exactly the most interesting post for the average reader. For those that are thinking about doing a similar thing though, this could be a very interesting post for you!

A very important lesson was learnt on the first day – the charging system doesn’t even start working until the sun reaches 70% of full power. This is due to the Li-ion charging system on the powerbank. It wont trickle charge so only kicks into life when there’s enough power to drive it. This renders about 8 hours sunlight per day as unuseable with this set-up.

The second thing learnt is that the charging system doesn’t work faster if there’s more power available. It seems that the power bank needs 12W to charge and will not take any more power if, say, 15W is available.  Thinking back to my basic electronics, I guess this makes sense! This means more waste though and requires balancing the charging requirements with the power available if i’m to use this set-up.

One very nice feature of the P3 panel was that it was able to charge the TabletKiosk powerbank directly, without voltage conversion. That helps a lot because the other solar panels i’ve looked at only drive 12V. That would mean converting voltage up to 19V and losing power in the process. Taking a few of the figures learnt, there’s a simple equation gives me the theoretical power possible per day.

Power available (W/hr per day) = Powerhrs x ChR

Powerhrs is the number of hours per day when the sun is over 70% power. (taken from sun power records. June. Bonn, Germany) This is about 7 hours in May, June and July.

ChR is the charge rate of the power-bank (must be about 0.7 of solar panel rating for best efficiency.) = 12W

This assumes a sunny day. No cloud cover. No shadows and the panel facing the sun. The changes of that happening are slim. I have the advantage that I’ll only leave the house if the 6-day forecast is good so I can reduce this risk to a minimal amount but I think I’ll lose another 20% through shadows and positioning while I’m moving. If cycling around becomes a problem with shadows and sun positioning I might have to carefuly plan my stops in order to maximise solar panel positioning. Maybe a stop at 10-11 and again at 3-4 would help get the best out of the early and late light.

So lets plug the figures into the equation and see what we get with the P3 solar panel and the TabletKiosk MP3400 power bank.

7  x 12 = 84W/hr energy per day assuming 15W from panel at max sun power.

Now for the second part of the equation:

1. There’s no such thing as a perfectly sunny day. Especially when you’re cycling. I’ve been advised to use a figure of 4 hours per day for sun. In my tests, on two sunny periods, I managed to load a 56W/hr battery in about 8 hours so the equation seems to be roughly OK. At a 12W load rate, that’s about 4 full hours of sun so I agree with the 4 hours rule.  
2. You can not charge and use the bank at the same time. This means that a second power source is needed for the daytime. In the evening its fine because I run from the powerbank. I could use the battery on the device UMPC in the daytime of course but what happens when its empty? Can I charge it from the solar panel (that’s stupid because I would need a second UMPC just to charge the battery – the solar panel will not be able to run AND charge a UMPC. Also, if there’s not enough voltage or current protection on the UMPC I would risk killing the UMPC) There’s is the possibility of topping up the UMPC overnight from the power-bank but If I do that, I have to consider the following…
3. To charge other devices from the bank, there is something like 20% power loss through the charging circuitry.

There’s one other point too. The powerbank can only store 56W/hr of power. Taking point 1)  into account brings me down to 48W/hrs on a sunny day which I guess solves the problem of limited powerbank capacity!

I think the best solution for point 2) is to use a second power bank. This also has the advantage of giving me a spare powerbank should one fail, and, being able to fill a second device should I find myself with sun and nothing to charge! It also reduces the risk of killing the UMPC and avoids the wastage of 3)

So we’re now at 48W/hrs per day. Its incredibly poor considering the power of the sun. In theory, the suns power is equivalent to 1Kw of energy for every m2 and that makes solar energy capture and storage horribly horribly inefficient. Consider that in 4 hours, about 2KW/hr of energy will be hitting the solar cells on the panel I tested. Yes 2000W/hrs. Enough energy to power a small UMPC for 1 month at 8 hours per day! The efficiency is a crazy 48/2000. Just over 2%.

How can this be improved? One thing I could do is to find a lower-power charging solution. That is, start storing energy before the sun reaches 70%. If you can start storing energy when the sun is at 50%, you have a few more hours per day and if you can start gathering energy at 30% power, you can even get some when its cloudy!

The second variable is the power-loss on charging. This is generally because the Li-ion batteries need a fairly strict charging voltage and current and there’s a fair bit of circuitry there to protect them. Lead-acid batteries could be better but, wow, the weight! To store just 70W/hr of energy you’re looking at 2.5KG. The 56W Li-Ion power-bank I have is just 500grams. 

The third option is to get a panel with more efficient solar cells.

Having said all that though, this is an off-the-shelf system that appears to work. I didn’t need to make any modifications at all and I like the idea that this project could go ahead with off-the-shelf equipment. It makes it easier for others to replicate it.

The big question now is, will 48W per sunny day be enough? If so, I don’t have to worry about the terrible efficiency and high cost. It will be enough to provide me with power where I can’t get it. I’ll be analyzing the power requirements in the next post to see if 48W per sunny day is enough. If it isn’t, i’ll have to go back and look at other options.