DOKIO2PCS 400 Watt Solar Panels 10BB 12/24 Volt Solar Panel kit High Efficiency for Rooftop Portable Power Station Farm Yacht and Other Off-Grid Applications（800w）…

I’m incredibly happy with these solar panels — they work perfectly and are already making a noticeable difference in my energy usage. The quality is top-notch, and installation was straightforward.What really stood out, though, was the customer service team. They were extremely helpful, responsive, and went above and beyond to answer all my questions and ensure everything was working smoothly.Highly recommend both the product and the company behind it!

The original 100 Watt solar panels have a lighter frame and are therefore lighter in weight than the heavier framed Renogy 100 Watt panels that look and perform virtually the same. I used four of the lighter weight DOKIO 100 Watt panels to construct two pairs of panels that are piano hinged on one side. I attached a cam action sash lock (to hold them closed) and a carrying handle on the other side. I sealed each of the screw locations with Loctite PL Marine Fast Cure Adhesive Sealant to prevent moisture entry. I positioned the solar panel sides to the inside of the hinge configuration to protect them during transport and carry. These two hinged assemblies when opened and wired together provide a nominal 400 Watt solar panel array.Note - the following information applies to DOKIO's original 100 Watt solar panels, not the 150 Watt panels described here on Amazon.Depending on your charge controller, you can wire the four 100 Watt panels in parallel (high 23 Amps/low 22.5 Volts) or in series (high 90 Volts/low 5.75 Amps). Another alternative (depending on your charge controller limits) would be to wire each pair in series (45 Volts/5.75 Amps) and then wire the pairs in parallel (45 Volts/11.5 Amps). The higher volts and lower amps can use smaller wires (10-12 Ga.) to efficiently (and safely) transport the power from the solar panel array to the charge controller if the charge controller is rated to handle more than 45 volts or 90 volts respectively.Update January 31, 2019 - At Ricky's request I added some pictures.Keep in mind that solar panel Wattage ratings are calculated under PERFECT conditions (the PANEL at 77 degrees Fahrenheit [not the air around it], 100% clean air and the panel perfectly aligned to the sun's rays). Virtually all solar panels will produce only about 70-80% of the panel's rated wattage in hot summer temperatures (-5% per 18 degree increase in the PANEL's temperature over 77 degrees). On the other hand, they can typically produce MORE power than the panel's rated wattage on very cold and bright sunshine days (+5% per 18 degree decrease in the PANEL's temperature below 77 degrees) so make sure your charge controller can handle the higher power if you plan to use these under very cold conditions.I discovered that I also need to work on controlling the RFI caused by the combination of my Chinese Manufactured MPPT charge controller and a 600 Watt Inverter ... RFI is not a good thing for operating Amateur radio equipment.Update March 23, 2019 - I have replaced my extremely RFI-Noisey Chinese Manufactured MPPT Charge Controller with a Morningstar PWM SunSaver Model SS-20L-12V that is compliant with FCC Part 15 rules regarding RFI control (made in Taiwan). Another Ham reported that this Morningstar PWM solar charge controller does not produce any RFI on his HAM system where he has connected his radio directly to the "Load" terminals on this model. Unlike most other solar charge controllers that allow only low-power lighting to be connected to their load terminals, this Morningstar charge controller's instructions describe full capacity loads (20 Amps in this case) can be connected to the charge controller's load terminals. This controller also includes a Low Voltage Disconnect (LVD) circuit that will shut the load terminals off if the battery's voltage drops enough to damage the battery if it is discharged any more.I will not operate my RFI-noisy DC-to-AC Inverter during Field Day. The FCC Part 15 rule compliant inverters cost in the neighborhood of $1,500-$2,000 and that high cost puts them beyond my budget.I haven't finished my portable power station for Field Day at this point but I will update this post after I get it operational and can determine if the charge controller produces any RFI on my Kenwood TS-2000 radio.Update June 27, 2019 - I updated my Field Day SLA AGM battery bank to a pair of Bioenno Power 12V, 20Ah Lithium Iron Phosphate (LiFePO4) Batteries and used only one of my 200 Watt panel arrays. The Morningstar Charge Controller mentioned above is designed to be used on Sealed Lead Acid (SLA), AGM or Flooded Lead Acid type batteries and does not work with Lithium batteries. To charge my new Lithium batteries I purchased a Genasun GV-10-Li-14.2V, 10.5 Amp 12 Volt MPPT Solar Charge Controller. I was concerned that its 10.5 Amp current limit might not handle the two DOKIO 100 Watt solar panels. However, in the 90 degree Fahrenheit heat (panels were hotter) and partly cloudy skies we had on Field Day this year, the panels (wired in parallel) averaged about 7 total Amps so no problem. I also used my older Kenwood TS-440SAT HF radio on Field Day and it worked very well. The Genasun Charge Controller (like the Morningstar) did not produce any RFI on the radio at all! We operated the TS-440SAT HF radio all day on Saturday on one battery and only changed over to the second battery around 9:00 PM and used that second battery Saturday evening until ~1:45 AM on Sunday morning when we shut down to get some sleep. We re-started at 7:30 AM Sunday morning and continued using the second 20aH Lithium battery until we shut down at the end of Field Day. The DOKIO solar panels did a good job on Saturday in spite of the 50% clouds (and a 20-minute rain shower). Sunday was mostly cloudy which limited the power from the two 100 Watt cells to about .12 Amps. Overall these solar panel's light weight and performance worked very well to build my small portable solar power system.

More efficient than my EF suitcase 400w portable. Heavy, yes! Mostly glass. Have the EF and this charging Pro and extra battery. Will pull 25w 75w and up to around 300. Long connector wire! Frame could be better seems solid to me. Got rid of 2nd 400w suitcase for this one. Mc4 connection hooked right up to Y connector. Only issue the positive plug very hard to push down on tiny numbs to unlock connector. Connector tool not wide enough. Use either needle nose pilers or stant tip tweezers. Those nubs seem fragile hope they hold up. These will work even w some shade on it. (Microinvertor) vs ? Kind that need full sun on entire panel area or dosen't work at all. Not bifacial either. Overall price is right, great panel! Will update if any changes.

The panels are flimsy and easily damaged. The packaging at the factory was terrible and there was not enough protection. Also when the stapled the ends, the staples protruded through the cardboard and struck the frame. One of the panels has a 1/2” bow to it from a likely blow to it during shipping. As far as performance, they do not output as much wattage as a set of slightly smaller panels I have.

These are absolutely THE BEST I’VE FOUND ANYWHERE! I’ve purchased (2) 400w panels two different orders DOKIO since January and I ABSOLUTELY LOVE THEIR PRODUCT! These are definitely the highest output I’ve found yet. 400w gets you 250-350w! That’s astounding as I’ve had other manufacturers panels which are 200w combined which get me an output if 50w, which is absolutely terrible, the problem is at different months of the year the sun hits different regions in different ways/intensity thus creating different conditions and charging outcomes however DOKIO definitely delivers as I’ve tested them against another well known brand which starts with an “R” and they definitely out perform that brand, to be absolutely fair the wattage of the other brand was definitely a lower rated panel however 100w getting you 25w doesn’t sit well with me. I’ll never purchase anything other than DOKIO again for my solar needs. Exceptional brand and product.

I have two of these 200 watt solar panels sitting on top of my van. I am getting less than 100 Watts out of both of them wired in series and I am not impressed with them. My last solar panel which was a single 200 watt panel would pull 120 to 131 Watts.

Set these up on top of my fifth wheel. Currently getting about 600W during the day which is just a little under the theoretical maximum considering the scorching desert heat they're in and efficiency losses (surface temps are hot enough to need gloves while handling the panels). These are also cheaper than the other panels I looked at on here. Could get similar panels a little cheaper elsewhere but that would also require ordering 10+ panels which I absolutely have no need for. Very happy with these, highly recommend them. Will update in the winter when temps drop off and we'll see just how much these can put out.Edit 7/23: Weather has varied a lot since the initial review. 600W is typically the low end of max power output. According to my charge controller most days peak somewhere between 650-750W. Several days I've hit 800-830W! Majority of the time when I check my charge controller app I see it steadily hovering around 550-650W. Today is fairly cloudy and I'm generating around 350-400W at mid day. Still very happy with these and looking forward to adding more.