Hatch board ventilation

[Timm R Oday25]

In an effort to keep the dampness to a minimum
And reluctance to put any more holes of any type in the boat , I cane up with I consider a valid alternative. The solar panel will sit over the sliding hatch . The bottom hatch board utilizes a single 12 volt muffin fan .
The fan disconnects easily when removing the hatch boards .
Any suggestions of something I may be overlooking ? This is a standalone unit , not in any way wired to the boats electrical system . Thank youYou cannot view this attachment.

[Spot]

I had a 'store-bought' solution on my boat, 6" fan + 15w panel, also not hooked to the battery.
https://www.amazon.com/dp/B0B4K6GV5T
I only used it in the driveway in the front hatch, built into a doghouse of sorts that was not ready for sailing.

A companionway hatch board solution would be neat.

I have used a one fan, two hole (active intake and passive exhaust) + solar panel + battery + charge controller setup to dry out the inside of a closed hull Sunfish.

I have been meaning to mount a couple fans in the cabin but have not gotten to it yet. It did not help that I ordered the wrong voltage fan the last time this was active on the project list... My current solar budget would allow some fan use in the cabin in the evening.

[Timm R Oday25]

I an unlimited amount of 12 volt muffin fans.My thinking is ,should one burnout a replacement is free takes 5 minutes and doesn't drain the house batteries