Redarc or Ctek. Which one.

[the evil twin]

Thanks I will have a look at mine at see if i can do this. so why in the hell would they make the panel output 24v then?

Heaps of 24 Volt applications around in Trucks, RV's and especially Industry.
24 Volts means more volts less current for same power.
Less current means much smaller gauge wire so lots cheaper and lots lighter installations

I dont see why you wouldnt be able to convert yours, I know out at opalton there is a debate on what is best for solar/ battery set ups be it 12v or 24 also some cars can be 24 so may suit them and grid connected solar setups use 24v panels

Agree mostly... however a lot of grid connect panels are 36 to 52 Volt (open cct) depending on manuf and application not necessarily 24 Volt because there are no batteries involved.
Again the higher the voltage the cheaper the wiring amongst other things

[mudski]

Ok here is what I have done and it has worked for me for the last 8 months..
Remove the cover on the back of the panels and you should see something similar to what’s in the photo, each side will be 12 volts simply remove the diodes linking the two sides and test the polarity of each side then simply solder the two positive and two negative to loop them together,

When doing this i also tested the panel when fully covered to see if removing the diodes would have any effect resulting in the panels draining the batteries at night and my multimeter showed no current so i was pretty satisfied.

Hope this picture explains it enough but make sure you test polarity as i can’t remember what side was what.

the red and white are the loops to be added.
Attachment 42775[

No go. Inside mine there is only three rows not four. I have searched and can't find a solution. I may have to just go buy new panels...

20140408_114736.jpg

[megatexture]

What do they come up with a multimeter? Your pannel has 3 parts? Have you checked out in all the pannels to see if they are the same
?