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Description
Morningstar Prostar Charge Controller MPPT 40A with Digital Meter - PS-MPPT-40-MThe Morningstar Prostar MPPT 40 M is a 40 A 12 24 V charge controller with digital meter. The Prostar MPPT solar charge controller and lighting controller with TrakStar Technology is an advanced maximum power point tracking (MPPT) battery charger for off grid photovoltaic (PV) systems. Detailed battery programming options allow for advanced battery support for the latest Lithium, Nickel Cadmium, and Lead Acid type batteries. Automatic PV based
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4.8 ★★★★★
Based on 2412 reviews
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Product Reviews
★★★★★ 4
Good but Installation was a Bit Iffy
Model: iPad A16 11th/10th/Air 11
90% of the time I use my iPad for school. Originally, I used just a regular screen protector, but it would get dirty with smudges and imprints from my Apple Pencil, and there would be a lot of glare since I'm in a classroom most of the time, which would make it awkward to see what I was writing at times. Plus, the screen protector was too smooth so it would actually be difficult to write legibly.
This product makes it a lot easier to write smoother on the iPad. I only just installed it, so I can't say much on the smear protection yet, but I can already see the reduction in glare as well. For $8, getting a pack of two of these with an install kit is a very nice deal imo.
My only issue was the installation process, which could've been as much my own fault tbh, but I felt like I aligned the screen protector pretty well with the sticker, however the first time I tried installing it it was way off the center (maybe my case got in the way?). The biggest issue was using the squeegee to pop air bubbles, and this is something they don't mention in neither their instruction guide nor video, but you're supposed to used the velvet red side, not the naked white side: using the white side actually takes the grit off the protector, which is obviously something you don't want on a product that relies on it. Thankfully I have another one in reserve in case this one wears off sooner than expected.
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Reviewed in the United States on October 7, 2025
★★★★★ 5
Perfect Paperlike substitute
Model: iPad Air/Pro 13
I’ve been using this screen for roughly two months now and I can say it was so worth it, it is rough on plastic nibs! I am going to order some heavier duty ones and see how it fairs! It works just fine ON TOP of a screen protector isn’t that great!
I wanted something like paper like but didn’t want to pay that expensive price for something I wasn’t sure I was going to like. This one does the trick and gives me just enough resistance to feel more in control of my pen!
It fits well just make sure to know the size if your screen I had to modify where the camera indent was but it cut just fine and looks great!
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Reviewed in the United States on May 24, 2026
★★★★★ 5
Game changer for Note Taking
Model: iPad A16 11th/10th/Air 11
Great quality, great price, easy to apply. Has completely changed the way I use my iPad and how it feels to write on it.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Feels like paper and makes writing fun!
Model: iPad A16 11th/10th/Air 11
I was hesitant to start using my iPad for class because I HATED how my Apple Pencil sounded hitting the screen while I was writing.
This product has completely changed my mind and now I use it almost daily! I love the feel of this screen and it has lasted all semester long. It was a little tricky getting the screen on just right, and I had to use both because the first time I had a bunch of air bubbles, but the second time was perfect! I think you would probably want to get a new screen every year to ensure it still has that paper-like feel, but I think that’s totally reasonable!
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Reviewed in the United States on April 24, 2026
★★★★★ 4
It gets the job done.
Model: iPad 9th/8th/7th, Model: iPad 9th/8th/7th
It isn't too difficult to install, but no matter how hard i tried, I still got some bubbles under the screen. It doesn't feel exactly like writing on paper, but it is much more comfortable than writing on the glossy screen. After i did some writing on the screen, the screen got sime marks that looked like scratches, but it seems to be some kind of dust that comes off the scree, i wiped it off and it disappeared. Now everything on the screen looks pixelated.
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Reviewed in the United States on May 25, 2026