I must admit, a lot of that went over my head, but I get the basic premise, & yes, that makes since. By the sounds of it these Sealey ones are no different, so I couldn't recommend them! I am quite disappointed with Sealey for releasing it, given that many people will fit them expecting their battery to be maintained for long periods, only for them to jump into their car/van/camper after a few months to find their battery not only flat, but damaged due to the battery suffering cold British temperatures with low/no voltage, leaving them with a large bill for a new battery. Its not on really. Might work in sunny countries, but if you live in the UK, forget it!
Sealey 12v/1.5w Amorphous solar panel. Unless my battery is holding charge good enough. But my last bike and battery was constantly draining whenever left for long periods,and this stopped the issue.
I've had an Oxford version of this, used more battery power than it charged during the winter months.
Which solar panel unit do you have, i have a Oxford Solarizer unit and too be honest its a waste of time, my motorbike battery is flat every time, I even went and bought a new battery thinking that the battery was duff but within a couple of weeks that was flat too.
Might be worth watching this video. Extrapolating for your application I'd say the schottky blocking diode is probably dissipating more energy in heat when reverse biased in darkness than the solar panel can deliver during the day.