Add input surge suppression

[jharvey]

@krzysztof9nowak commented

• Input fuse F1 might be unnecessary. MPPT current of a solar panel is about 90% of short circuit current, so it's impossible to select a fuse, which would fail on short circuit. However, I would consider adding some over-voltage protection in form of either Zener diodes or varistors, which could protect from voltage spikes induced by lightning strikes.

What do you think about this TVS? https://jlcpcb.com/partdetail/Brightking_Elec_taiwan-50SMDJ120CA/C729864 I see it's 26A peak amps. I'm not finding much for a better option at JLCPCB. I'd like more like 50A peak, so it has a chance of blowing the fuse if there is a surge event.

[jharvey]

I did this with the below TVS, it's 34A at 90V.
https://jlcpcb.com/partdetail/Yint-50SMDJ90CA/C2912801

I used multiple TVS diodes in hopes that the amps will blow the fuse, as one fuse is not enough to pop a 35A fuse. I used a SMC footprint which also include thru holes, which should allow for other options if they are found. Seems like most options are SMC or thru hole. I also re-arranged the circuit a bit, so that the fuse is first, then surge protection then the rest of the circuit.

[krzysztof9nowak]

Multiple TVS looks good.