I need the same (matching) size/type diode on both inputs? And on just the positive side, like I have in my original design?
Two diodes are better than 4 in a full bridge with half the drop. and heat loss.
Ignore the negative out
Good point RJ. I added a diagram for his confirmation and Iagree this is an easier device to thermally heatsink (like an old CPU heatsink) and insulate and they are cheap.
If you leave the 12V input disconnected but with everything else connected - and no sun - what voltage do you get at the Ecoflow input?
Without actual loads connected, a digital multimeter may be reading from minuscule leakage currents that would have no effect with all parts connected.
If you get little or no voltage at the Ecoflow input, then try connecting something as a load at the 12V connector - a resistor, 10K or so, or a a low power filament lamp, and see what voltage you get across it with the solar panels producing a good output?
I've used a bridge rectifier before for just two of the diodes for the same reasons of cheapness compared to two diodes and ease of heat-sinking and mounting.But it just looks SO wrong
Damn clever idea though.