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Maybe you need to let everyone in on what you're thinking, or define an actual question, the mindreaders are on holiday at this time of year
Is there a picture of the circuit you have in mind? What are the Schottky diodes for? Are they for protection diodes in parallel with each panel or for something else?
Schottkys have a voltage drop of roughly 200mV to 400mV. Can the circuit being powered by the panels (series or parallel panels?) function on ~3.5V?
Could you be a bit more specific about what you want to do? Do you want to combine the outputs of the four panels to charge a battery or something else? The !N5817 is an example of commonly available Schottky diodes. It's rated for 1A and should have a forward drop of 0.3 - 0.35V at 250mA.
No circuit diagram, just a tiny home project. The solar panels collect to a DC Buck Converter that works at 0.9V to 7V input and outputs 5V 2A max via USB. Likely due to the losses, though, it can barely charge a flip phone, and not my 1+1 phone. Which is fine, that's it's purpose, but i'm told that if I use a schottky diode on each panel, it will prevent the panels from leaking current and discharging the battery at night, as well as improve the overall performance in the event of a failed or obscured panel so it doesn't block or significantly reduce output from other panels.
I am also told that if I used an LDO of some sort that it would better normalize the power for the buck converter and greatly improve efficiency.
"Ideal diode" is actually the name of a real component (a controller IC), e.g. made by Linear.
More generally speaking, an active circuit with respectively controlled MOSFET can achieve a very low voltage drop. For the reported specification, regular schottky diodes seem to suffice at first sight.
Well, I got a bag of schottky diodes here, I strongly believe they're rated 15V but no markings tell me anything else about them. I do know they're nigh impossible to get solder to stick to the legs. They're axial, and super thick bare wire.
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Update:
Mouser has already shipped replacements. I hope they work! I got 5 even though I don't need them all because it will be a first soldering in something that small. Wish me luck!
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