If its true (and I'm sure it is as I have no reason to doubt you) I may as well get one of these
My shed has an ethos. (Heehee) it has to be off grid and as much as possible everything in it must be begged, borrowed, reclaimed, hand made or no more than about 20 quid.
Interestingly I've been monitoring the charge on a second battery these past few moments which is attached to a smaller 10 W solar panel and one of these
It started at about 12.4 v after several months on a shelf but this morning was down to 12.01 v. There is no other load on this battery.
Was that because it was very cold this morning or does the controller leach battery power in weak winter sunshine?
Perhaps the UC3906 is a better option given my objectives. I will further investigate it's switched mode option.