DOKIO Monocrystalline Solar Panel Size 400W 31V for 12/24V Devices, Aluminum Frame, 3m Cable, Pre-Drilled Holes for Yard, Garden, Shed, Off-Grid Power
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Availability:
Only 10 left in stock, order soon!
Arrives
Tuesday, Aug 18
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Set name: 400W
Features
- [REAL-WORLD POWER] Rated 400W at STC; actual output varies with sun angle, temperature, shading, cable runs, and controllerMPPT helps keep charging steadier.
- [3 m MC4 CABLELONGER REACH] 3 m (9.84 ft) leads give more routing freedom than short-lead panels, often reducing extra extensions and joints. Cleaner runs, fewer weak links.
- [12V: USE PARALLEL] For most 12 V systems, parallel wiring delivers more stable performance; use series only if your controller explicitly supports higher input voltage.
- [FEWER JOINTS VS 4100W] One 400W panel replaces four 100W unitsfewer branch pieces and connections, faster install, less risk of power loss from bad joints.
- [OUTDOOR-READY BUILD] Tempered glass and aluminum frame with a sealed junction boxdesigned for rain and splashes in yard/garden applications.
Brand: DOKIO
Material: Aluminum,Tempered Glass,Iron
Product Dimensions: 44.6"L x 1.2"W x 67.8"H
Item Weight: 49.4 pounds
Efficiency: High Efficiency
Efficiency: High Efficiency
Maximum Voltage: 12 volts
Maximum Power: 400 watts
Output Voltage: 12 volts_of_direct_current
Item Dimensions L x W x H: 44.6"L x 1.2"W x 67.8"H
Item Weight: 49.4 pounds
Material Type: Aluminum,Tempered Glass,Iron
Brand Name: DOKIO
Included Components: Bag
Model Number: DSP400M
Unit Count: 1 Count
Manufacturer: DOKIO
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If you place your order now, the estimated arrival date for this product is:
Tuesday, Aug 18
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
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View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
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.
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Reviewed in the United States on August 16, 2018 by Scouter III Scouter III
Improperly packaged, missing foam padding. Box damaged and shows that it has been open and re-taped with just a few pieces if tape. This is my fifth panel and unlike this one they were all padded with foam. Fortunately the panel was not physically damaged. The sixth one is still underway. Otherwise I would have given a 5 star. Those are 150 watts panels and gives 135w under the winter sun of Arizona' mountains, really happy about the performance. Unfortunately they are not available anymore, I had to order two 200w panels from DOKIO to finish my installation. They are more expensive.
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Reviewed in the United States on January 24, 2026 by Rock Dubois
works fine. no issues.
Reviewed in the United States on February 1, 2026 by happy buyer
The panel has nearly identical dimensions of the Renogy panel however you can see in the photograph that it is thinner. The aluminum housing is also flimsier (if you have strong fingers you can bend it by hand). In the photo the Dokio panel is on the left, the Renogy panel is on the right. Also the holes for the mounting brackets (not included) are not in the same place as the Renogy panel, so if you are installing mixed manufacturer panels on your array you'll have to drill holes in one of them if you are putting these on rails, the Dokio panels being the ones that are easier to drill through due to flimsier design. Power output seems good and the cheaper aluminum housing may not be a concern, but understand that these panels are cheaper for a reason. Where the corners on the housing meet the aluminum doesn't match up exactly. All that being said, I will probably buy these again due to price point.
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Reviewed in the United States on March 31, 2018 by My Eyes Are Up Here! My Eyes Are Up Here!
I have 3 of the 150watt and I got every bit of it (450+)in the cooler winter months in Florida!! They beat out my harbor freight, which is hard to do!!! In the summer months not so efficient, but that is to be expected no matter the panel!! All panels love the cooler weather. These are kicking butt right now!!!
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Reviewed in the United States on January 23, 2026 by Gerry
Product is ok but seller is awful. One of the two panels.does not work . I messaged amazon and the seller about this. Seller said they would send a single replacement panel. I took photo of the faulty panel and sent to them as requested. Seller then stated a replacement was ordered and they would provide tracking info as soon as it was available. A few days went by with nothing so I message again seller apologize and said it was ordered and tracking would be provided when available. Few more days went by then nothing, seller ignored all communication. Amazon initiated a return but being a 2 pack they scheduled both to be returned. One is mounted on the roof and in use. Amazon won't return just 1
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Reviewed in the United States on May 4, 2025 by doug howarth
Size: 400W*2
Arrived very well packaged, with no shipping damage. Looks like decent workmanship. Good price. Did a quick diagnostic check of them once unpackaged and they all were generating at spec watts and voltage.
Reviewed in the United States on January 8, 2026 by JR
Size: 400W*2
Great panels I have 5 of the 400 watt panels in series and typically generate between1500-1650 watts on my jackery 5000 Plus on a clear day. For now I have them leaning on my fence but will ground mount them so hopefully I see a increase in performance
Reviewed in the United States on January 10, 2026 by T.Ruck T.Ruck