I have designed a harvesting board almost exactly to the reference. I am using a IXYS SLMD480H12L solar panel instead. The VOC for the solar panel is 7.65V and the MPP voltage is 6.06V. When I connect it to the circuit I get 1.782 Volts and it slowly increases. For example in 15 minutes it will increase to 3.690 volts. I am getting the MPP current of 18mA. I would think the voltage would be constant, not varying. I am also only getting about 70% efficiency.
Any ideas what might be wrong?
