In this install video, I’m working with the MidNite Solar SPD (Surge Protection Device), specifically the SPD 600V unit. The whole job of this thing is simple: if you get a surge or lightning event, it clamps that high voltage and sends it to ground so you’re not smoking expensive gear like your inverter and MPPT charge controller. I walk through what the three leads do (green = ground, black = negative, red = positive) and how I’m tying it into my solar wiring in a small breaker box. I show my exact wiring layout: solar coming in from outside into the bottom of my DC breaker, wires out the top going to the inverter, and the SPD landed right alongside those connections. The big takeaway is to keep the wiring as short as possible, especially the ground, so I trim the green lead down and tie it into my existing earth ground. Once everything is buttoned up, I flip the breaker and check the blue status LEDs to confirm the SPD is working. For around $110, it’s a solid piece of protection that can save you from a really bad day, and in some areas it may even be required.