HQST Bifacial 100W 12V Solar Panel, 9BB Monocrystalline Solar Panels with 25% High Efficiency Module PV Power for Battery Charging Boat, Caravan and Other Off Grid Applications

So far so great! For the price you will not do better. These are double sided (in short on the back side they capture reflected light and boost the overall output. I am getting well over 100 watt on these 100 watt panels). I am not sure how long they can maintain such a low price, however, one panel is a great price and two panels bought together is over the top amazing. Super simple standard connectors and if you need straight wire connections the wire quality is great for stripping and utilizing (this most likely voids warranty, with that I can see no reason why you would need to use the warranty as the panels are solid and well built. As for the double sided feature, the concept calls for the panels to be mounted off the surface so that reflected sun light can hit the underside. So if your brackets are up allowing light to get underneath these are for you. You do need a controller, pick a good one. PWM controllers are not as efficient as MPPT. You pay more for MPPT and it is well worth it (look for deals). In my specific DIY application I am doing a 360 degree rotational rig so that the panels are always facing the sun. For seasonal adjustments I will set the pitch (or seasonal angle manually 4 times per year, i.e. Summer Winter solstice and spring and fall equinox). ~20 degrees to about ~40 degrees towards equator). I am using a slow high torque motor and a timer (motor speed .6 RPM the timer is on 4.17 seconds every hour). A slip ring keeps the power line from twisting. Fun little project.... Be well!

I bought these panels for two reasons: The price and the size. I have actually bought 16 of these panels - 4 different times I've purchased the 4-pack of 100 watt panels. They are nearly $100 cheaper for the 4-pack today than they were when I bought the first 4-pack. As of March 18, 2023 they are $274.99 for the 4-pack of 100 watt panels and there simply isn't a better deal for new panels than that anywhere. The other thing that steered me towards these was the size. I wanted to be able to take these with me - at least a few of them - on the road if I needed to and as someone who doesn't own a truck or a van, these panels were the perfect size for being able to toss them in my car. And they are rather light weight, too, on a single panel basis at just over 13 pounds. As for the panels themselves and how they work - they work great. During a clear day, at peak sun, I will get anywhere from 97% to 102% of the rated output of the panels. In order to get that kind of output you are going to need to dial in the angle of the panels, but if you do get it right you can get the full output with these. The only "con" to these panels is that the MC4 cables are a little bit short. You have plenty of room to connect one panel to the other when they are next to each other, but compared to some other brands they are a bit shorter cables with less wiggle room for your potential set up. As noted though - you shouldn't have any issues connecting one to the other if they are next to each other. This "con" is very nitpicky, but it felt worth mentioning as not every person purchasing them will be mounting multiple panels that are touching each other. If you are in the market for 100 watt panels then I would very highly recommend these.

I caught these panels on sale and wanted to try them out for a DIY emergency solar setup to use for when the power goes out. These panels performed really well with my Victron charge controller, a LIFEPO battery and 2000 watt inverter. I used them to run that setup and then tested them with an adapter cable to charge my EcoFlow River 3 Plus power bank. I bought 4 of them and now I'm thinking of adding some to my camper to keep the batteries charged while in storage.

I'd give 5 stars but the packaging was not that great but they were really cheap so it maakes sense very pleased so far Beat the heck out of eco worthy not the greatest packaged but arrived undamaged I applied mylar to the back of the 4 panels I got and even though it's end of may and june is another day away when the clouds have cleared and it's the brightest from 1pm to roughly 4 pm I have achieved 110 watts a panel , the bifacial 4 panels I got also out perform the 5 other panels I have on cloudy days by sometimes up to 25% which really shocked me , the other 5 are eco worthy and arent bifacial so bifacial is the only kind i'll get now as it's mostly cloudy in the PNW this time of year When there are no clouds my 4 bifacial panels get the fan on my 1000 watt grid tie inverter running very loudly and both sats of panels do this Have only had them up for a couple months and my first regular panels cut my power bill by 35% so am very much waiting on my next bill to see the difference as my first set should even be an improvement as I had a bad connector and didn't notice for at least a week as I was working so much overtime that month I didn't have much chance to see them operating during sunlight hours Overall VERY impressed with hqst as head to head the only thing eco worthy beat them on was packaging quality , I would have to give hqst a 5 star rating and hopefully the best is yet to come , the only downside is the bifacial panels create the tiniest amount of power in the dusk hours as they should but my wired meter most times has to be disconnected from the system and the system being completely re started for them to read voltage again correctly , sometimes they kick back on properly but not always That's on the cheap 150 amp meters and not the panels but THEY DO WORK WELL I got them when they were on sale for $59 and expect after summer the price will drop again so I will by more then as I have no real complaints and when weather cooperates they outperform expectations so for that they get 5 stars , washington sunlight negative 3 stars but at the price they will pay for themselves in 3 to 4 months including the grid tie inverter and wiring so great deal and hope tarriffs don't make em harder to get down the road

It's been in service for several years and still working great. Survived 3 hurricanes.

Bought these for our eco flow.In case of emergency.I had an older panel of this same brand and it worked really well. After purchasing one of those foldable solar panels 200 W. And only getting 85 I decided to go back to these glass panels. They might be a little bit more bulky but in an emergency, it'd be perfectly fine. I only set them up against my patio chairs to test them. They're not that heavy really. About 10-12 pounds apiece. I'm very happy with the results 187 W they were pulling in at approximately 11:30 AM. I had two 100 W panels connected so I'm very happy with 187.watts. I highly recommend this brand. I believe they make a good quality product.I liked them so much I bought 2 more.was getting 101 watts from one 100 watt panel! Cant do better than that ! Five stars for these!

I will buy again. Cable length could be longer but we made them work. I use these to charge my Bluetti.

I thought these were great but something isn't right. I have been toying with these for weeks and buying all kinds of cords. Maybe mine is a fluke, but idk i feel like I'm cursed lol. I bought all kinds of cords and none work. There is no cord that fits it and I've searched and searched for the mc-4 cords... these seemed to be reversed or something.... can someone contact me please? I am so confused and have spent so much money to get these to work. I have the charge controller, the battery, the adapter cords, but everytime i try to buy the mc-4 cords, they are reversed. Have have look hard for the right ones and bought several ones from amazon and now other shops Nothing