Some more testing of the bluetooth LE Forumslader:
Yesterday I drove 65 km with an average speed of 28,5 km/h, producing renewable energy. At the beginning the buffer battery was charged around 90%, the FP2 around 65%. At the first 20 km the dynamo hub charged with 9 - 10 W. The phone was switched on the hole time, but without running GPS. After the buffer battery was filled to 100% the charging power went down to 4 - 5 W, than switched off to 0,0 W, than again on to 4 - 5 W and so on. In that state the charging currant for the phone (charged to 100%) stayed around 200 mA, the screen on, the phone running the Forumslader app, showing speed, charging power, currants, voltage and some more.