So I have a 18650 charger circuit with solar panel, and I used a 1n5819 schottky diode. However I can measure a 7.-ish voltage (there is a little drop through the step down converter I guess) on the marked point.
But when I am trying to put a load there (a fan) the voltage almost disappeares. I have also tested the diode with a multimeter and it worked properly.
Is this a normal behaviour of a diode?