I'm a newbie that happened to make a home-made solar panel that outputs 18V and 6A without a load. I'm planning on charging a 12V battery bank through an MPPT or PWM. I've been researching what type of blocking diode I should put on my solar panel and I'm getting confused.
I have a couple Zeners on hand, but I know the reverse voltage on them is far too low. I found out that Schottky diodes are often used as bypass diodes for solar cells, but read that they also have low reverse voltages and high reverse leakage current which didn't sound suitable for a blocking diode. Normal silicon diodes seem workable, but I don't like the voltage drop of ~0.7V compared to the Schottky's ~0.45V.
So what diode should I use? Should I just take the hit and lose 0.7V with the silicon diodes? Or is this a moot point because the MPPT/PWM would take care of this (if so, what if I wasn't using an MMPT/PWM)?
Thanks in advance. Cheers!