While its a great idea to try to make money on Free Energy devices...
Sorry, but Its never going to work.

 Govt. is under control by the International Bankers, otherwise known as
the Illuminati.    Who also manage to have control of the Oil and gas
systems...  as well as the Tax money from that system.

 They own just about any kind of big industry you can think of... so
any attempts at production will be met with a slew of problems.

 Either you will be token out before production (shot, poisoned, etc..),
or cant get patents (corrupt govt.),  cant get the financing (cause
they own the banking system),  cant get certain materials for production
such as steel (cause they own that too)... cant get production models
shipped (cause they are paying the drivers to lose the cargo), 
units are malfunctioning..  (cause workers are causing defects, or
materials are defective, or products are being intercepted in shipping
and being tampered with)  Cant get units across the boarders or
waters.   I could go on and on and on.   

 Watch "Tucker The man and his dream"  for even an Inkling about this
stuff... which is a true story.   And that was well long ago, and today
its even worse. 

 The best bet would be to provide plans to make working units to the
public.   And or to sell parts / kits,  for reasonable sale prices.

 In reality, its much more dangerous to keep the device a
secret... because the inventor will die.. and so will the
device with them.

 Give it away to humanity... and strip the evil controllers of
their power over us.   Set up a donation link, and Id bet
youll be set for life once people see that the thing works
for them.