I remembered last night that I had solar panel in my scrap box. The size was perfect for Jolla and a quick test proved that it can be used to charge Jolla too:

- voltage is about 6 V (measured with multimeter)
- panel outputs 40-80 mA under a lamp (measured with multimeter)

I haven't seen sun in a month or so here in Finland so the test was performed under 70 W halogen, distance ~10 cm.



More pictures:

http://relativity.fi/jolla_solar_toh/

Today I modeled new other half for the panel and printed the new model. The panel fits nicely. I dit not take yet pictures from the inside, but I soldered some wire to the panel outputs and glued wires so that they are in contact with Jolla power pogo pins.

UPDATE: Jolla's CSD tool shows charging current of -10 mA (at winter in Finland). This means the panel outputs about 100-110 mA at winter in Finland (the idle discharge current is about 100 mA). There's still room for 60-70 mA more, but this can be tested here when the sun is shining a bit higher at summer.

Under the 70W lamp CSD tool shows +50-60 mA, so the panel is giving about 50 mA out but the battery is still discharging. The phone still says that charger is connected.
UPDATE END

I have to test the Solar Half more, but it indeed seems to be working rather nicely

EDIT: .stl file available here: https://github.com/skvark/TheOtherHa...esolarhalf.stl
EDIT2: I misinterpreted the CSD tool. Yes, the phone says it's charging and yes, the CSD tool says "Charging" but under a lamp the panel is just limiting the disharge current. If the battery is actually getting more juice, the current is shown as negative value. However, the original 70-100 mA is still realistic.