Re: Jolla Solar Half prototype
 

The answer from IRC only covers the wireless charger + usb cable test so I don't know. This is why we really need the official specs from Jolla.

Edit: juiceme has the answer for you :)

Re: Jolla Solar Half prototype
 

Actually that's not true. It charges without the pin too (took it off to test again). Hmm..

Re: Jolla Solar Half prototype
 

This is brilliant stuff! I'm really impressed and excited by this!
@skvark - I downloaded and printed a copy of your 'other half', it came out really nice, but sadly, it doesn't quite fit the phone in the length.
It was that tight that it started to bow the phone so off it came!
I used Netfabb Basic to cut a section from the lower half of the model and stitched it back together in Blender.
I'm going to my friends tomorrow to print it off, hopefully it won't be so tight!, perhaps we have some settings wrong on my mates printer, but when we measured the model the dimensions were as you set them.
Has anyone else experienced the same thing?, I've added 1mm to the length of the model to compensate but I will also check the software for the printer again.
Any info appreciated.
Regards
Mark

Re: Jolla Solar Half prototype
 

I'll look into this, but it seems there's about 0,4 mm error in the model length and PLA (if you used it) tends to shrink max. 1%. I'll keep you updated.

Re: Jolla Solar Half prototype
 

Thanks for replying. Yes, PLA was used and I understand what you're saying about shrinkage/tolerances.

I will post back later tomorrow after another printing session! :)

Re: Jolla Solar Half prototype
 

I did some measuring with the CSD tool (= phone is in airplane mode and I have turned the tohd.service off). Charging current under the 70 W lamp stabilized to 50-60 mA and some spikes go to 70-80 mA. If the CSD tool can be trusted (and the panel is actually charging the phone, like the phone and the tool says), there should be about 1% more battery every ~30 mins. To confirm this, I ran a short test:

I started testing at 18:00 (battery level was 85 %). Strange thing is that the UI does not update the battery level without a reboot (bug?). So I rebooted the device couple of times during the loading period. After every reboot there's was always 1% more battery level. Reboots were at 18:45 and 19:45. After the second reboot device reports battery level of 87 %. So getting 1% takes more than 30 mins.

Some conclusions:

- the 1W (125x36mm) panel is enough to upkeep the battery level and to charge the phone very very slowly (under a lamp, sunlight it would be maybe 2-3 times faster)
- for faster charging more efficient panel is needed

Re: Jolla Solar Half prototype
 

Or not but the reboot sucks some juice. Not sure about Jolla but on N900 a reboot always does.

125x36mm = 0.0045 m2. At full sumlight that should receive about 5W of energy. The best solar panels have about 20% efficiency. So it is not even theoretically possible to get more than 1W from a solar panel of that size without revolutionary technology advances. Sorry.

Re: Jolla Solar Half prototype
 

very cool stuff

Re: Jolla Solar Half prototype
 

Reboot propably sucks some juice yes. I was referring to this post: http://talk.maemo.org/showpost.php?p...78&postcount=7

The panel size is actually 125x63 (made a typo, not 36mm), so it gets close to 2W.

Re: Jolla Solar Half prototype
 

Just for imformation:

http://www.adafruit.com/products/1485#Technical_Details

http://www.adafruit.com/images/medium/1485_MED.jpg

This one is only 0,77 mm thick! :D

.