MidNite SolarSurge Protection Device MNSPD-300-AC

Added this to my Enphase combiner box on a 15A breaker. When I had the system OK’d, the inspector asked what it was, and when I explained it was a surge protector, he said “nice, that is pretty smart”I like that there are small LEDs that show both legs of the 240 circuit are OK and still protected.

Works like a champ, glad I put it in, we had some really bad storms and this thing worked flawlessly. Remember the best place to put this is as close to the meter base as possible. Nice blue LED lights lets you know in glance that everything is working properly. You can tap off any double breaker out at the meter base, use a 15 or 20 amp breaker as close to the top of the panel as you can. You want to clamp any strike to your electrical system as close the meter base as you can to prevent damage to the system

These are awesome, protected my system from a massive strike.

A few weeks ago a lightning strike near my house traveled up the grid and damaged my solar inverter. It got past the installed Delta lightning arrestor which did not protect the inverter and also showed no signs of having been activated. I had to replace the expensive inverter. However, the question remained of how to protect the new inverter from surges in the future in our lightning prone area here. I reviewed many whole house surge protectors on Amazon and also information on Midnite Solar's SPD which I learned can actually be wired to protect the whole house as well as the breaker for the inverter circuit at the same time. There is a youtube short video in which the engineers at Midnite Solar demonstrate the lab tests of both the Delta SPD and their own model which is clearly superior. Midnite Solar's tech rep answered my email pronto to clear up a question I had on connectors that I had. I highly recommend this product, and with the 5 year warranty they will repair your unit if damage etc. Instructions on MidNite's web site. Notice in picture how I used crimped ring connectors and wired the black and red leads o the L1 and L2 bars in the main breaker with green going to ground. Some suggest using a separate breaker, but I didn't have room. If the inspector allowed the original SPD from installers with the wires jammed in with hot wires in the breaker then he shouldn't object to this.

I have mine outside my solar controller room. Attached to my combined box. I can see from my house if it's working by the blue light on it. Have had lighting hit the ground 20 feet away, and all was well!. However I have a large grounding rod pounded also in the ground with my grounds going to it.

Bought both the DC and AC protectors, good products, clear instructions and straight forward to install. Recommend to all ! Thanks

Really simple to install. I can't say if it's good or bad until lightning strikes.With all these things you never know until you need it to work. It's a leap of faith.

We live in Oklahoma and it has withstood the test of harsh conditions and time. I have had it installed in my shop for approximately 6 years and I have never had a problem.