Fix solar charging of Jolla phone with direct solar usb charger

The technical details given are pretty poor by the web site (Sonnenrepublik - ClicSwing) :-(

But anyway it is a common problem with this direct chargers, that instead of charging the phone, the phone battery is discharged over the solar cell (which heats up). This happens whenever the solar power is not enough, 'coz the direct sunlight is to little. The most common case is that the very low charging current will wake up the phone. After woked up the phone power consumtion is higher that the supplied current. Then the phone stays in charge mode but get actually discharged.

The solar cells are definitely not heating up. It is more likely, that when the phone is connected to a charger it does not go into sleep mode and thus significantly increases the battery drain without need. Thus it is a phone software bug - not a direct charger problem.

My experience is that a power bank between solar cells and a cellular phone or other device to recharge is really necessary. Power banks are designed to do that, se for example http://www.sistech.com/.

i've noticed the same issue with my SolarTOH, battery decharge is accelerated. haven't tested with full direct sunlight yet, but on a semi-sunny day it doesn't recharge, only decharge.

Using a power bank is just a workaround to the problem. When connected to a charger, the phone should not consume so much power in first place, but charge while mostly remaining in sleep mode. Then a power bank is not needed at all.