Walt; Your removable panel... is it removable for just for trailering? Also; ware does you back stay hook up? Is it on the rail? Or in the original spot?
Back stay is in the stock position.
My boat has a fixed 10 watt panel and a removable 40 watt panel. I have been using that boat for a 1 week trip in Feb and if Im lucky, another one week trip. Im usually in a marina for most of the nights but dont have AC power so about the only power Im saving on is an anchor light.
I have a battery charge monitor (Linklite) and it tells me my net amp hours (what I used minus what I generated) and from watching this, I have just not needed the 40 watt panel. I have a newer 9.8 Nissan outboard that DOES contribute to the battery charge (it has a regulator/rectifier vs. only a rectifier).
So the last few one week trips I have done, I did not bring along the removable 40 watt panel and just did not really need it. A 40 watt panel isnt going to hurt sailing performance much but its still nice to not have it there.
I did a quick spread sheet to show about how I end up using the battery on these trips..
Note that with the 200 amp hour battery capabiliity (2 golf cart batteries), I can comfortably get down to 100 amp hour left over. My actual experience is that I end up using the outboard a little more than shown and I actually have not seen the amp hours go below 25 down.
I have this 10 watt panel permanently mounted on the boat for a trickle charger - keeps the batteries charged when the boat sits in the side yard. When I am done with a week trip, the 10 watt panel gets the batteries back to full charge - takes a while but that is no issue.
In your case, I think having very low power loads - and excess generation is probably a good idea (allows for more margin)
Your panel idea looks good. Just one thing to consider... if you put too much wind resistance back there, it may affect how the boat tacks in higher winds. This winter a guy with a Seaward 26 had his bimini up and had trouble tacking in windy conditions - boat would get stuck in irons. Probably another good reason to just have flat panel back there.
In the picture below, the 10 watt panel is there.. but you cant see it
Next picture - sailing with the 40 watt panel a few years ago (also about the last time I had this panel on the boat)
In another thread, someone asked how much solar panel you need and the responses ranged from none to 80 - 100 watts or something like that. Just depends on how you set up the boat. Im using about 15 amp hours per day. Earlier in this thread, Sumner said he uses about 44 amp hours just for the fridge and CPAP - not counting anything else - about a factor of 3 times my entire daily use. Just depends on what you want between optimized for sailing - or optimized for comfort.