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What I can suggest is to download the free simulation package from Analog devices/linear technology called LTSpice.
I haven't used it, but see what it's capable of doing. There are some very capable people on this forum that should be able to help.
At low voltages and power levels, there is a diode parameter called Rds(on). Diodes have a voltage drop depending on temperature.
The most common material is Silicon. The usual number used is between 0.6-0.7V at room temperature A schottkey diode is a metal semiconductor junction which has a lower voltage drop. The https://www.nexperia.com/products/d...iodes-and-rectifiers-if-lt-1-a/1PS79SB30.html is Schottkey diode..
The voltage multiplier circuit is not function so the power loss there is near zero.
You picked some good diodes that only loose 0.36 volts. But that is a great deal of the 0.5V 44hz power source.
Can't find it now. There is a paper on what you are trying to do. They use a 1:10 transformer to change the source from 0.5V to 5V. Now there is enough voltage to work with. Some one makes a IC that includes the diodes and boost PWM to get power to charge a super cap.
This might be the part I was working with a couple of years back. (could be a brother of the part I used) It needs 3V of AC to make energy. I used a 1:10 transformer to get the voltage up. video on the 3588 part