Re: Solar panel on Freerunner back cover
Hi Radek, I was looking for a GPS bluetooth mouse with solar pannels for longer navigating. It seems that it is hardly worth the effort, it will give you a few precent longer uptime and time to full charge would be like days. Just my 2 cents. Kind regards, Ed On Thu, 2009-04-02 at 10:17 +0200, Radek Polak wrote: Hi, yesterday i found on internet company that is selling small solar panel pieces. They are quite cheap and my idea is to put them on back cover of Freerunner so that they can improve battery life. Here [1] is link to web page with informations about panels. It's only in czech, so i can translate some basic paramteres: Available sizes in mm: 51,2×51,2 51,2×25,6 51,2×20,4 51,2×17,1 51,2×14,6 51,2×11,0 51,2×10,5 29,4×12,3 25,0×12,3 Volage (no-load): 0,57V for all variants Current: 700 350 280 230 200 180 140 90 70 I'd like to have 7 pieces. Those could do 7*0.57=3.99V and 180uA current. Would it be possible to attach output from this solar panel straight to battery connector? Do you think that this can work? Thanks Radek [1] http://www.solartec.cz/cs/vyrobky-a-sluzby/technicke-udaje/sady-rezu.html ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Solar panel on Freerunner back cover
Radek Polak pson...@seznam.cz writes: Would it be possible to attach output from this solar panel straight to battery connector? Do you think that this can work? Make it 5V, use a regulator and the usb port just to be on the safe side? If you keep the phone in your pocket the solar panel won't help much anyway so external solar panel should be ok, right (it can also be much larger that way)? -Timo ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Solar panel on Freerunner back cover
Radek Polak wrote: I'd like to have 7 pieces. Those could do 7*0.57=3.99V and 180uA current. Would it be possible to attach output from this solar panel straight to battery connector? Do you think that this can work? You'd need at least an additional diode (preferably schottky for low drop), to protect against discharging via the panels when the voltage drops below battery voltage. Other than that, it should be fine, since the battery has a built-in overcharge protection (At least the official Freerunner battery has one). -- Tobias PGP: http://9ac7e0bc.uguu.de ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: Solar panel on Freerunner back cover
On Thu, Apr 02, 2009 at 10:17:23AM +0200, Radek Polak wrote: I'd like to have 7 pieces. Those could do 7*0.57=3.99V and 180uA current. Hopefully that's 180 mA. Would it be possible to attach output from this solar panel straight to battery connector? Do you think that this can work? You'd want a diode in there to prevent the charger from charging your solar panels. Alternatively, if you're good with a soldering iron, you could try to use the unused adapter input of the PCF50633. Please see figure 4 and/or figure 38 in the PCF50633 user manual. The adapter input is not used on the Freerunner. You might want to ask questions like this on the hardware list. -- Rask Ingemann Lambertsen Danish law requires addresses in e-mail to be logged and stored for a year ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
