I talked yesterday about my testing with the Viliv S10 and my 24w solar panel. Today I’ve implemented the solution as my desktop PC.

Previously (for the last 5 months) I had been using a Fujitsu U820 UMPC as my desktop. It was running Windows XP on a Intel Atom 1.6 CPU. The Viliv S10 is running Windows 7 Home Starter on the same Atom 1.6 CPU. Both solutions use a fast SSD. You can see that I have it set up to drive an external monitor, mouse and keyboard but I’m still using the screen on the S10 as an extended monitor. With the extended screen, Windows 7, quieter operation and a better USB solution (the USB bus on the U820 would often reset causing a keyboard and mouse lock-up) this is a better working solution than I had before.

Cont’d…

The 24W solar panel is only powering the screen but at 0937 this morning I was surprised to see it charging the running S10. At that rate I have the opportunity to get 6 hours charging out of this July sun meaning a full charge per day; enough for 8 hours usage in this set-up. The problem is that I lose the sun behind a tree and the side of the house at about 1300 hrs. I need to get the panel on the roof to solve that issue.

I’ve ordered a Turnigy watt-meter that I’ll use to measure power utilization so check back for results some time in August because in a few days I’m off on holiday!

Note on my PC usage: I work mainly within the browser using cloud-based applications like Gmail, Google Docs and iTweet. I use Windows Live writer as my main publishing tool and sometimes use Tweetdeck for some Twitter work. It’s a simple set-up that needs very little processing power.

Update: The Interview on Home Of Solar Energy is available here.

I mentioned the Viliv S10 in an article about solar-powered computers for 2010 and it turns out that it has the same 9.5v input as the Viliv X70 tablet. Having an input voltage below 12V is always an advantage and it’s even better when the X70 car adaptor works on the S10. I threw out the panel, connected it to the car adaptor and S10 and we’re away. I now have a 3G-capable, Windows 7 convertible netbook running directly from the sun.

I’ve added an extension cable and the S10 is now sitting on my desk with the solar panel outside. I’ll be giving this a long-term test to see how much sun is needed to get by when using 3G. I’m estimating that 5 sun hours will give me 10 hours of usage which means that, given we only have 4 full-sun hours per day and that cloud cover is guaranteed for 50% of the year, I will get about 4 hours per day out of the solution. It’s terribly inefficient to charge like this though. The S10 sucks just 2-3 7-10W when charging. The rest of the power produced by the panel is being wasted so I’ll put my lead-acid battery in-line to suck up the rest of the juice.

Advantages of the S10:

• Built-in 3G, Wifi, Bluetooth
• SSD (fast, silent, no spinning hard disk)
• Convertible Touchscreen (for flexibility)
• Ultra low power (10 hours on a 47wh battery that should charge in one sunny day)
• Great keyboard, SD card slot
• At 1.2KG, lightweight for a netbook
• Because of car adaptor, doesn’t require intermediate regulator or battery.

Disadvantages

• Hinge could be a weak point
• No daylight screen (as on virtually every other device)
• Relatively expensive compared to netbooks (Total solution, including solar panel, would cost about $1000)

I’m off on holiday next week but will do some testing when I get back in the first week of August. Note: Direct charging of PCs from solar panels without a regulator and buffer battery can damage your PC if not set-up and tested correctly.

It doesn’t stop me thinking about solar computing though and in this post I’m going to compare a set of devices and some technologies that will be important for the job of Solar PC 2010.

Before I do that I want to highlight a few things that really haven’t changed much in the last 3 years. It’s a sad story of minimal progress.

• Solar panels – NOTHING has changed. They’re still expensive and inefficient.
• Battery Tech – NOTHING has change. They are still expensive and use the same technology as before.
• Operating system choice – Nothing has really changed. If you want to work efficiently you need to choose the same OS as you use on the desktop. Mobile operating systems have come a long way but there are still too many potential roadblocks for the average productivity user. Windows 7 is nice but compared to XP it’s less efficient which in my book, makes it the best choice for efficient and productive mobile computing.
• Screen technology. Outdoor users are still fighting the sun with LED backlights although this is a great step forward from the CCFL backlighting I used in 2007. Transflective screens are coming in 2010 though. See below.
• Weather – Ah, there’s something that hasn’t changed much either! Still, constant chaos. (Thank goodness!)

The device shortlist.

Click for more information.

Luckily the computing platforms have moved on somewhat and along with better engineering and components so there are some great contenders out there. Lets take a closer look at the best ones under 1KG. From top left in the images above:

• Viliv X70
• UMID BZ
• Fujitsu U820
• Fujitsu UH900
• ASUS EeePC T91
• Viliv S5
• Viliv S7
• Sony Vaio P-Series

Viliv appears three times in that list and is shows that they’ve done a great job of working around the Intel Menlow platform and producing some amazingly high-quality and efficient UMPCs that are focused on mobile productivity. Take the S7 for example. It has an excellent keyboard, SSD hard drive (rugged) and convertible touchscreen and comes with a built-in 3G option. The 34wh battery can last for 6-9hrs depending on usage. The tiny BZ is even more efficient though. The 17wh battery lasts for 5hrs…online and it comes with an external battery charger adaptor for 9V charging.

ARM-based devices.

You’ll notice that I haven’t included a single ARM-based device or ‘smartbook’ in the list above and the reason is simple. There aren’t any productivity-focused devices available. You might think that the ‘cloud’ provides the answer but the cloud is a long way away from being a mobile solution right now so despite the increased efficiency of ARM-based tablets and notebooks, I’m afraid it’s not a solution for the main computing device. For a smartphone though, yes! It’s the only solution.

Waiting for the screen.

My problem with all of the above solutions now is that I’m aware of two technologies that are close to hitting the market in 2010. Both Pixel-Qi and Mirasol have solutions that can save a lot of power when in high ambient light situations. Up to 1.5W in sunlight on a netbook-sized device. That’s a huge saving in a device that might be using only 6W. A 25% saving is huge and also helps to keep things cool in the device which helps other components too!

The advantage is so, so great that I’d hesitate to buy any device for a mobile tour unless it had the technology included. I’ve tested it and heard that it’s coming and if it hits a netbook soon (likely before UMPC style devices) I would seriously consider it…despite the extra weight of a netbook. 600gm extra weight to save 20-25% energy and to enable full-sun usage is a huge benefit. It also brings a bigger screen and keyboard for even more efficient working.

One of the most interesting 10” devices I’ve seen recently is the Viliv  S10 ‘Blade’. It’s a slick, SSD-based device built on the Menlow platform. It’s one of the lightest 10” devices at 1.2KG and it’s very slim. Once again it looks like Viliv have made it super efficient; the marketing claims up to 10hr battery life on a relatively small battery so I’m wondering…how about an S10 with a Pixel-Qi retro fit which could take it to 12hrs or more. For 1.2KG that’s a huge advantage and if there’s a way to charge a second battery separately, direct from solar power then we’re cooking with gas (as they say.) Oh, i forgot to mention that there’s a 3G and 2.0Ghz CPU option! I have a little worry about the convertible screen hinge but that’s the only potential issue right now.

Smartphones

One thing that has changed since 2007 is the smartphone. The capabilities of a high end smartphone are almost unrecognisable from those of 2006. Cameras, processing power, screens, keyboards, operating systems have all changed for the better and there is serious potential to be doing a lot of ‘microblogging’ work on a smartphone which would increase mobility and save battery life for full-on productivity sessions. I’m a big Google user and the choice of phone for me would be relatively simple. The Android operating system offers a fast, easy and efficient way to access my emails, docs, chats and maps and through the huge number of applications available in the Android market I would have no problem finding easy ways to keep people updated with my location and latest photos. The Motorola Milestone (Eu version of Droid) is clearly the best choice at the moment although the landscape is changing every two or three months here. I’d be looking for a phone with a keyboard, a superb camera and GPS and a large, easy-to-read rugged screen. (The Milestone uses Gorilla Glass) Battery life is of course important but at this level, the differences are unmeasurable based on technical specifications and the limited number of details reviews.

Summary.

I feel a plan coming together but I need to work on that PC solution. 1.2KG isn’t my ideal choice (600gm and a much smaller form factor – The Viliv S7 perhaps) would be better but if that new screen technology hits the ground, it’s a must-have. It just so happens that an S10 sample is coming my way soon (for testing on UMPCPortal) and I also happen to know that there are some 10” Pixel-Qi screen samples knocking about. I think it’s time to give Pixel-Qi a call to see if they want to help out with a new solar computing tour!