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Energy Harvesting by piezo

I'm tryng to develop an energy harvesting circuit. The source is a multi stack system composed by multiple piezo diaphragms. Every stack has a no-load voltage and current of 110V and 70uA.

I am not an expert in the field of energy harvesting or power managment.
I want to ask an advice how to proceed.

Is it possible by help of the forum choose an available commercial solution or do you think I need to contact a design company ?

thank you in advance 

best regards