A question re 12/24 volt PWM controllers.
Attached is a manual for a ebay one with LCD display plus USB.
It says it can handle up to 50 volts solar
input and is self detecting on 12 or 24 volts.
Can I assume that if you connect to 12 volt battery
(eg manual says to connect battery
first anyway), the unit defaults to 12 volt operation regardless of the voltage of the solar
panel ? eg is you have a 36 volt panel the controller will still handle that and still only charge the battery to 12 volts (actually the float at 13.7 volts)
My set up seems to do this okay (albeit I have two controllers feeding off one panel via diodes on the solar inputs, each one charges a 1100CCA battery)
The good thing with these PWM's is that you can always see the voltage on the LCD display and set the charge and cut off voltage (I run some ultrasonic transducers to minimise barnacles).
I've also seen one that shows incoming amps.