Hi,
currently, I'm designing a wireless sensor node with the SPV1050 energy harvester. However, as I read the datasheet, I got kind of confused with the input capacitance for the source. In the datasheet on page 21 there is mentioned that the selection of the input capacitance has an influence on the MPPT performance. There is a calculation given with two variables I do not understand. T1 is some sort of time constant, and I(MP) is the minimum operating current for MPPT? But what exactly are these values?
For example, the evaluation board (STEVAL-ISV019V1) uses two 4.7 uF capacitors in parallel as input capacitance and states that this circuit is suitable for I(MP) between 30uA and 20mA. So can I just double this value if I use 40mA solar cells? I plan to use two of these in parallel: https://www.digikey.de/de/products/detail/anysolar-ltd/KXOB25-05X3F-TB/9990459
Any help in calculating the input capacitance is very appreciated.
Best regards.
