Re: Suggestions to Protect Portable Panel
Assuming it has an aluminum frame, get a fridge box, cut out a piece to fit over the face of the panel, and another for the back. And/or make a 4 sided box out of it, and you will be fine. A single panel won't produce enough current typically to cause any problems of fire or shock. Remember, a panel will only put out ~80 of rated in absolute full sun. If the panel is stuck in the back of a storage container you will have no problem.
On the other hand, if you are worried about security in the storage facility, put the cardboard on it, and take it home, leave it in the back of the garage, or the basement, or better yet, set it up at home to float charge the lawn mower or car battery over the off season.
I have a 90 watt panel that is portable, and when I leave home for an extended time, I just unplug it (Anderson connectors) and leave it inside.
Please note, being a moderator does not add any weight to my opinions 300 watts Siemens/BP panels,plus a Sun 90,, making ~400. ~30 amps into Rogue MPT-3024, 450 ah of Trojan T-105, Morningstar ts300 inverter, a Tri-Metric meter.a collection of antique generators, plus 2 Honda eu-1000i's (also a BS2512 IX controller) and assorted other stuff!