Massimo 100W - 300W Solar Panels of Camping Outdoor Sports (100W)

These are excellent panels, especially for the current price. Completely unmatched. I have four. Easy to use, comes with lots of cable options. I only wish the VOC was slightly lower so I could wire them in series for my Delta 2 Max.

I like how easy it is to carry this panel, the price did seem competitive in its heyday, and it does kind of work... but I'm always underwhelmed by its lower-than-rated production and floppy legs. In particular, these particular panels seem easily and catastrophically shadowed by the tiniest blades of grass or etc, and often can't be set up in better locations if there's even a slight risk of rain because they allegedly can't tolerate getting soaked for any length of time. It seems like newer panels from established PV brands now tend to use waterproof (e.g. ETFE) encapsulation and connectors, and some even provide integral power optimizer circuits - either of which would make for a noticeably better user experience. There's clearly a lot of room for improvement in portable panel quality before prices fall any further.

They work good at first then start failing one by one.

The panel’s look well made but they don’t work.

300 watt panel was on sale so figured I’d roll the dice. It’s big and heavy but has a lot of adapter cords and even a winter day with partial shading I managed to see it peak at 210.

Looks like I got someone's return as the box was already opened from the side. I plugged it in and the red light shows that it's supposed to work but it doesn't. Zero watts.

Not quite enough Voc to charge up a 25.6V (24V) LiFePO4 using a Victron 100/15 charger.I tested Voc as 31.33 volt.About 0.5 V below the turn on voltage (5 volt above battery) required for my 24 volt system at 86% charge (26.71 V) using a Victron Smart Solar 100/15 charge controller.With lower temperatures and a lower charge state, it should work on a 24V system, but is not optimal.I did some more testing:Definitely more than 200 watts. At least 250 watt panels and probably close to the 300 watt rating.Conditions: Fairly clear low winter sun in North Carolina at 9:00am.Tested with Victron 24V system at 65% charge. They started charging, one panel gave 4 watts and the other gave 130 watts. Cutting them off and back on resulted in one starting at 100 watts and the other one not starting.Moved to an EcoFLOW Delta 2 Max at about 60%. Instantly started charging at 170+ watts per panel. I placed two BougeRV 100 watt Arch flexible panels in series on the Victron 24V system and got 144 watts. So at the low sun level I got about 39 watts more than the 200 watts of Bouge RVContinued test until around noon when I got 183 watts from the BougeRV panels and 238 on the Massimo panels. The 300 watt panels gave 55 watts more than the 200 watt panels.I wish they had another 2-3 volts open circuit to reliably start the 24V Victron system, but 238 on a warm day with a low sun is in my expected range.I did some further testing:Tested the first of my two today and had no problems.Panel setup on the built-in stands without trying to optimize the angle. Cable was a MC4 to XT60i going into a Delta 2 Max. Current tested with a clamp meter, and temperature with a cheap Laser Temp Gun from Amazon. Power was based on EcoFlow App.Low Temp was around 30 F and High around 50 F.Started about 9:00 am and got around 170 watts.Case around the electrical box was zipped closed.Tested at 10:30 and got 219 Watts and 9.6 Amps. This calculated to a working voltage of about 22.8V.Front Temp: 115 FBox Temp By XT60: 90 FBox by USB ports: 86 FLeft zipper open to cool off the electronic box.Tested at 11:43 and got 219 Watts.Front Temp: 113 FBox Temp By XT60: 83 FBox by USB ports: 74 F3:15 pmSun was very off center, and front of panel barely lit up70 WattsFront Temp: 67 FBox Temp By XT60: 61 FBox by USB ports: 62 F

Got the 300 watt solar panel and able to charge my Bluetti EB3A at 199 watts in full sun