I think the major issue holding back PPS is the debt / equity which is sitting at just shy of $29M while the company holds just over $1M in cash.
TWMJf (to put this into perspective) in Canada has a market cap of almost $200M with cash on hand around $5M and also $5M in debt / equity.
I think until TRTC knocks more of it out of the way (as they've done so in the past). Then things will start to lift off, but not before. As it stands being a $40M cap company that debt will make most investor easily put two and two together to move on.
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