We have a Gardina model home with a high peaked roof with vented soffits all around and 4 builder-installed static "mushroom" roof vents, plus several smaller roofer-installed ridge vents. When I have been up in the attic, during any season, any time of the day or evening, I always am able to detect moving air or a slight breeze blowing thru the attic area up towards the roof vents.
So my advice is to avoid punching additional holes in your new roof and depend on the existing vents which were originally designed into your home according to original architectural and engineering specs.
As for solar powered vents, who knows if they are actually working unless you can periodically check on them. My neighbor had a couple installed a couple of years ago and was told to periodically check them by either crawling up on the roof or crawling back to an unfloored area of the attic. If you feel the real need for an additional vent and want to interfere with engineered passive flow of attic air, I'd go with the suggestion of a thermostatically controlled hard wired vent. At least you know if it was running.
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All of us could take a lesson from the weather. It pays no attention to criticism.
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