Re: LF: OT, Remote site, garden progress, Solar battery charger

[DK7FC <73dk7fc@googlemail.com>]

Sorry, there is a mistake in the circuit. I will update the image in the 
evening.
73, Stefan

Am 27.09.2014 00:51, schrieb DK7FC:
> Hi all,
>
> Since today, my solar powered battery in the garden is charged by this 
> solar battery charger, 
> https://dl.dropboxusercontent.com/u/19882028/20140927_004153.jpg
> It took some time until i found the circuit that suits my 
> requirements. The losses are very low! The supply current of the 
> circuit is just 40 uA!. The circuit is a comparator design which 
> generates no QRM during ON and OFF times. The switching transients are 
> relatively slow (not like in usual switch mode supplies). The 
> hysteresis causes a switch-off voltage of 13.9V and a switch-on 
> voltage of 13.3V. The high current diode which is a very low forward 
> voltage drop is taken from an old SMPS...
> Just in case someone want to play with similar stuff and likes to have 
> some ideas...
> 73, Stefan/DK7FC
>
> PS: Yes yes yes, of course the may be similar circuits in the web and 
> someone has done it before. But it wasn't the goal to do something the 
> first time, as usual :-)