What can you do if you have built a working prototype of a great invention idea but have very limited funds?

I have built some very interesting electrical devices that would completly eliminate the need for batteries, hand cranking generators and outside power sources so I know my ideas work.

Not getting into details here (about the inventions) what I am really asking is what can someone like me whose funds are very limited do to push this idea? Who can you trust? I’ve tried looking up things on the internet to only be more confused. Not sure where to turn these days. Is this hopeless without money or very little of it?