Works, though I don't see how you'll get 30W out of it.
This is appropriately sized to be a 30W panel (in one of my other reviews I've got an image of 3.5 to 100W panels, (unlike that one) this one fits size wise, so I didn't compare to panels other than a similar panel that when I ordered this didn't realize was from the same company, but the other panel was pretty good (and matches the % of rating of good panels when I've tested.)
This panel is on the right in the unfolded picture. left on the folded picture. it's more square, and doesn't fold quite as flat.
I was only able to get a max of 18W out of either panel today. We had some high level smoke/clouds. (Still was very bright.) I'm not sure you can get 30W out of this panel at all. It only has USB-C and USB-A connections. When you plug in both (only way to get higher) the USBA drops to low, and the USB-C has most of it. (Numbers I had were it dropping to 6W (per display, not necessarily perfect.) + 8.4V@1.4A (11.76W) getting up to 18W, but no higher. Not sure if it would had the sun been perfect, if it could have pushed out more or not.
Either way, Even if it's only 18W it being a 30W panel should give you that 18W a lot more often than a smaller panel. You seldom see 100% of a panel's rating. (I have some which meet it semi regularly and they were getting about the same percentage as the 30W. They have exceeded it by a fair margin, but only high altitude, on a highway after a rainstorm then full sun.)
Now let's talk price. This thing is currently $70, the other panel is $40, and has more features. It's from the same company so, I don't know why the discrepancy. This seems to not be a great value comparatively, with most 30W panels being half the price. (Check the size though.)
Overall, I think I'm going to give this 4 stars because of the combination of value and fewer features compared to others. It's not bad technically, but it does seem about twice as much as similar and mildly better options.
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