Wagan 3000 watt Pure Sine Inverter Review – Pros & Cons – Wagan EL3810


This Wagan 3000 watt Pure Sine Inverter is like a dependable friend for your electronics. It takes the 12 Volt DC power from your car battery and turns it into the 110 Volt AC power that many household items use. Think of it as a translator, smoothly changing one type of electrical language into another. So, if you want to run a small pump or even get WiFi in a remote spot, this item can be a game-changer. It boasts a continuous power of 3000 watts, and it can even handle a surge of up to 6000 watts for a short time, like when some devices first turn on. The Wagan 3000 watt Pure Sine Inverter produces what's called a pure sine wave. This is important because it's a clean and steady type of power, much like what you get from the outlets in your Basement. Some cheaper inverters make a more jagged, "modified" sine wave, which can sometimes cause problems or even noise with sensitive electronics. But this Wagan 3000 watt Pure Sine Inverter delivers smooth power, so your devices should run just as well as they do at home. It's also ETL certified, which means it meets certain safety standards, giving you peace of mind. For anyone who needs power on the go, whether for camping in Canada or working far from an outlet, this inverter is a solid choice. It has multiple outlets, so you can plug in more than one thing at once. While it's a powerful piece of equipment, remember not to ask it to do more than it's built for. It's a reliable Way to bring some of the comforts of home with you. The manufacturing process focuses on compliance and safety, and this item reflects that. FEATURES: - 3000 watt continuous power - 6000 watt peak surge power - Pure sine wave output - DC 12 Volt to 110 Volt AC - ETL certified - 3 AC outlets - 2.1A USB port - Ground fault protection - Overload protection - Cooling fan This Wagan power inverter changes 12 Volt DC from a car battery into 110 Volt AC, like what you have in your house. It can give you 3000 watts of continuous power and up to 6000 watts for short bursts when things start up. It makes clean power, called pure sine wave, which is good for sensitive electronics. It has three regular outlets, a USB port to charge phones, and safety features like protection from ground faults and too much power draw. It's also certified by ETL, meaning it meets safety standards, and it has a fan to stay cool.
PROS: - 3000 watt continuous power - 6000 watt peak surge - Pure sine wave output - Three AC outlets - USB power port (2.1A) - ETL certified - Remote switch capable - Conformal coating - Overload protection - Over temperature protection - Low voltage alarm - Low voltage shutdown

CONS: - Did not meet expectations - Remote not included - Can be heavy (12.5 lbs) - May overload easily - Warning about lead - Can be pricey - Cooling fan can be loud - No clear lifespan info


The Wagan EL3810 is a device that changes 12 Volt battery power to 110 Volt AC power, like what you use at home. It can give you 3000 watts of power all the time, and for a short burst, it can go up to 6000 watts. It has three places to plug in regular stuff and a USB port for charging phones. It's certified safe, can use a remote switch (but it's not included), and has a special coating to protect it. It also has safety features like stopping if it gets too hot or overloaded. Some people had problems because it didn't give as much power as they expected, it can be heavy, and the fan might be noisy. Also, it might cost more than other similar devices, and there's a warning about lead in it. We don't know exactly how long it will last. Read more...

Wagan 3000 watt Power Inverter Shown with Features


Wagan 3000 watt Power Inverter Shown with Features

This image displays the Wagan Pure Line 3000 watt power inverter. It highlights the inverter's AC outlets and heavy-duty cables. Text boxes emphasize 'TrueRated Power,' meaning it can handle its full load for a long time. Another feature shown is 'Ground Fault Protection' for safety against shocks and fires.


Wagan Power Inverter: Ports and Terminals


Wagan Power Inverter: Ports and Terminals

This image shows the front and back of a Wagan power inverter. The front has three regular outlets for plugging in devices. It also has a USB port for charging phones or tablets. There are lights to show if it's on or if there's a problem. The back has connections for a battery, a ground wire, and fans to keep it cool. You can also see holes for mounting it.


Power Inverter for Converting DC to AC


Power Inverter for Converting DC to AC

This image shows a Wagan Pure Line 3000 watt power inverter. It can change the direct current (DC) from a 12 Volt source, like a car battery, into the alternating current (AC) needed to power household devices. The inverter has outlets similar to those in your home. It can handle a peak power of 6000 watts for short bursts. The image also shows icons of different electronics that can be powered by such an inverter, like a radio, laptop, game console, TV, blender, washing machine, lamp, drill, coffee maker, refrigerator, microwave, and circular saw.


Wagan 3000 watt Inverter Offers Great Protection


Wagan 3000 watt Inverter Offers Great Protection

This image shows the Wagan Pure Line 3000 watt power inverter. It highlights several safety features. These include protection from short circuits, over voltage, and overheating. The inverter also has a low battery automatic shut-down feature. This helps to protect your battery from being completely drained.


Wagan 3000 watt Pure Sine Inverter Shown


Wagan 3000 watt Pure Sine Inverter Shown

The image displays a Wagan Pure Line 3000 power inverter. This device changes DC power from batteries into AC power, like what you use in your home. It has several outlets to plug in electronics. Red and black cables with ring connectors are included. These cables connect the inverter to a battery. The packaging for the inverter is also visible in the background.


Wagan 3000 watt Power Inverter Certifications


Wagan 3000 watt Power Inverter Certifications

The image shows a Wagan Pure Line 3000 power inverter. It converts 12 Volt DC power to 110 Volt AC power. The inverter has several certifications displayed. These include CE, RoHS compliant, and ETL Listed by Intertek. These marks indicate that the product meets certain safety and environmental standards.


Power On the Go


Power On the Go

This is a Wagan power inverter. It can give you electricity from your car battery. It has plugs like the ones in your house. This lets you use things like TVs or tools in your car. It can handle big power needs for a short time. It's useful when you don't have regular outlets.




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Best Wagan 3000 Watt Pure Sine Inverter Deals

BELTTT 3000W Pure Sine Wave Inverter 12V DC to 120V AC, 6000W Peak

Image of BELTTT 3000W Pure Sine Wave Inverter 12V DC to 120V AC, 6000W Peak

Product Highlights

  • ✅ 【PURE SINE WAVE INVERTER】: The power inverter output waveform is consistent with the AC waveform of the utility grid and is suitable for inductive and capacitive loads. It extends the service life of the equipment and reduces the fault rate. Can be used with electrical equipment such as televisions, home theaters and other sensitive loads for a long time
  • ✅ 【POWERFUL DC to AC CONVERTER】: This solar inverter delivers 3000W of continuous battery DC 12V to AC 110V 120V power and up to 6000W of peak surge power when the load is started. The 12V inverter has a conversion efficiency of greater than 93% during normal working and low no-load losses
  • ✅ 【INTELLIGENT LCD DISPLAY】: This 3000Watt inverter comes with a high-brightness real-time smart screen that simultaneously displays input and output voltages, battery and load status, multiple operating conditions for timely troubleshooting. At the same time, the output voltage and screen can be adjusted independently in a small range
  • ✅ 【MULTIPLE SAFETY PROTECTIONS】: Pure sine wave inverter provides undervoltage, overvoltage protection, overload, over temperature protection, short circuit and reverse connection protection. Aluminum and sturdy plastic housing ensures long term use

LANDERPOW 3000W Pure Sine Wave Inverter 12V DC to 120V AC 6000W Peak for RV

Image of LANDERPOW 3000W Pure Sine Wave Inverter 12V DC to 120V AC 6000W Peak for RV

Product Highlights

  • ✅ 【𝟑𝟎𝟎𝟎 𝐖𝐚𝐭𝐭 𝐈𝐧𝐯𝐞𝐫𝐭𝐞𝐫】--- This pure sine wave inverter can provide 3000W continuous clean DC to AC power (6000W surge) with >91% efficiency, which strongly and effectively reduces conversion loss and protecting sensitive electronics (Microwave Oven, Laptops, CPAPs, LEDs) from damage. Handles heavy startups (Coffee Machine, Window AC, Power Tools) effortlessly. For RV, Home, Solar, Emergencies.
  • ✅ 【𝐏𝐨𝐰𝐞𝐫 𝐈𝐧𝐯𝐞𝐫𝐭𝐞𝐫 𝐏𝐮𝐫𝐞 𝐒𝐢𝐧𝐞 𝐖𝐚𝐯𝐞】--- LANDERPOW inverter delivers the same as grid-quality Pure Sine Wave AC power, outperforming modified sine wave units. Safely powers inductive/capacitive loads (Window ACs, Coffee Machines, Refrigerators, Home Theaters, Car Audio) with zero hum/flicker. Protects sensitive electronics, extends lifespan, and cuts failure risks—ideal for long-term use.
  • ✅ 【𝟑 𝐀𝐂 𝐎𝐮𝐭𝐥𝐞𝐭𝐬+𝐅𝐚𝐬𝐭 𝐂𝐡𝐚𝐫𝐠𝐢𝐧𝐠 𝐔𝐒𝐁/𝐔𝐒𝐁-𝐂+𝐇𝐚𝐫𝐝𝐰𝐢𝐫𝐞𝐝 𝐀𝐂 𝐓𝐞𝐫𝐦𝐢𝐧𝐚𝐥】--- This All-in-One Power Inverter features 3 AC Outlets + 1 Hardwired Terminal for high current electrical appliances/tools, plus 5V/3.1A USB & 30W PD ports for fast device charging. Multi-interface flexibility powers RV trips, job sites, and emergencies with pro-grade reliability. The plug-and-play design is very user-friendly.
  • ✅ 【𝐇𝐢𝐠𝐡 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝟏𝐀𝐖𝐆 𝗣𝘂𝗿𝗲 𝗖𝗼𝗽𝗽𝗲𝗿 𝐁𝐚𝐭𝐭𝐞𝐫𝐲 𝐂𝐚𝐛𝐥𝐞𝐬】--- The LANDERPOW inverter 12V to 110V comes with two 1AWG/2 FT high-quality thickened pure copper battery cables, which can effectively protect the safety of the inverter during use. It is not easy to get hot during use and the conversion efficiency is higher.

Renogy Inverter P2 3000W Pure Sine Wave Inverter 12V DC to 120V AC Converter for Home, RV, Truck, Camping, Trailer, with Wired Remote Controller, Support Li, AGM, SLD, Gel, FLD Batteries

Image of Renogy Inverter P2 3000W Pure Sine Wave Inverter 12V DC to 120V AC Converter for Home, RV, Truck, Camping, Trailer, with Wired Remote Controller, Support Li, AGM, SLD, Gel, FLD Batteries

Product Highlights

  • ✅ 【POWERFUL DC-AC】This 3000 watt inverter 12V to 110V provides 3000W continuous DC to AC power, 6000W peak surge during load start-up, 12V to 120V AC pure sine wave with conversion efficiency >90%, reduces conversion loss.
  • ✅ 【SAFE FOR USE】Power inverter has LED indicators for under-voltage and over-voltage protection, over-temperature protection, over-load protection, and short circuit indication. Cooling funs and ground-fault circuit interrupter (GFCI) protection
  • ✅ 【PROTECT YOUR ELECTRONICS】Pure sine wave inverter provides quality AC equivalent to grid power which will protect and extend the life of your electronics and appliances, such as flood light,TV, freezer, laptop,tablet etc. With its quiet and high inductive loads, the solar inverter operates with no buzzing sounds when your electronics are turned on and allow them to run smoother, cooler, and quieter
  • ✅ 【EASY-TO-USE】This inverter 3000W 12V offers a built-in 5V/2.1A USB port, 3 AC Outlets and 1 AC Terminal Block, a 16.4ft Wired Remote.Perfect for outdoor emergency AC power supply during work trips,camping and more

Renogy Inverter PUH, 3000W Pure Sine Wave Power Inverter with UPS Transfer Switch & Bluetooth, 12V DC to 120V AC Converter for RV, Truck, Home,Camping - 6000W Surge Power, Remote Monitoring

Image of Renogy Inverter PUH, 3000W Pure Sine Wave Power Inverter with UPS Transfer Switch & Bluetooth, 12V DC to 120V AC Converter for RV, Truck, Home,Camping - 6000W Surge Power, Remote Monitoring

Product Highlights

  • ✅ 【Easy connection and power worry-free】Renogy inverter PUH has an on-grid transfer switch, so you can seamlessly switch between on-grid AC and off-grid DC power, ensuring uninterrupted operation and worry-free energy.
  • ✅ 【Enjoy a smarter, more convenient life】This power inverter is equipped with built-in Bluetooth and a wired remote switch, supporting remote control and the Renogy App for monitoring, and providing effortless connectivity and ultimate convenience.
  • ✅ 【Optimize efficiency】Pure sine wave inverter, exceeding 92% inverter efficiency, while power consumption is less than 18W, ensuring cost-effective operation and minimal impact on the environment.
  • ✅ 【Quiet operation】Inverter 12v to 110v boasting a noise level of less than 51dB, all electronic devices run smoothly without any noise interrupting the peaceful ambiance.

LiTime 3000W Pure Sine Wave Power Inverter, 12V DC to 120V AC for Off-Grid

Image of LiTime 3000W Pure Sine Wave Power Inverter, 12V DC to 120V AC for Off-Grid

Product Highlights

  • ✅ 85%-90% Conversion Efficiency: LiTime Pure Sine Wave Inverters differ from Modified Sine Wave Inverters by providing clean, stable power with conversion efficiencies in excess of 90% (in an ideal environment), due to the influence of battery voltage, current, wire loss and ambient temperature, the efficiency will decrease slightly. Ideal for use in high-power appliances and sensitive electronic equipment. Perfectly suited for home, RV, camping, and off-grid.
  • ✅ All-round Safety Protections: The LiTime Inverter ensures all-around safety with over-voltage, low-voltage, overheat, overload, and short-circuit protections, safeguarding both your devices and the system. Its high-efficiency dual cooling fans intelligently regulate temperature, enabling smooth performance even in extreme environments (-20℃ to 40℃).
  • ✅ High Output Power: LiTime 3000W inverter converts 12V DC to 110-120V AC power efficiently with a 6000W surge for clean and stable operation. Whether you’re powering heavy-duty equipment or multiple devices simultaneously, the LiTime inverter is designed to meet your energy needs with ease and reliability.
  • ✅ Fast Customer Service Support: The CE/FCC/RoHS certified products guarantee both safety and quality assurance. The inverter of LiTime has the same perfect after-sales service as the LiFePO4 battery of LiTime. We provide professional technical support and customer service as phone support or online services with quick feedback within 24 hours.

Renogy Inverter P2 3000W, 12V to 110V Pure Sine Wave Solar Car Power Inverter, DC to AC Converter with 16.4FT Remote Control for RV, Truck, Camping, Home Backup, Outdoor, Emergency, Off-Grid Living

Image of Renogy Inverter P2 3000W, 12V to 110V Pure Sine Wave Solar Car Power Inverter, DC to AC Converter with 16.4FT Remote Control for RV, Truck, Camping, Home Backup, Outdoor, Emergency, Off-Grid Living

Product Highlights

  • ✅ Powerful DC to AC Converter: This car power inverter 12V to 110V provides 1000W continuous DC to AC power, 2000W peak surge during load start-up, pure sine wave with conversion efficiency >90%, reduces conversion loss
  • ✅ Pure Sine Wave Inverter: Advanced pure sine wave technology provides quality AC equivalent to grid power which will protect and extend the life of your electronics and appliances, such as flood light,TV, freezer,Laptop,tablet etc. No buzzing sounds and allow them to run smoother, cooler, and quieter
  • ✅ Safe for Use: The 1000 watt inverter has LED indicators for under-voltage and over-voltage protection, over-temperature protection, over-load protection, and short circuit indication. Cooling funs and ground-fault circuit interrupter (GFCI) protection
  • ✅ Plug & Play: This solar inverter comes with built-in 5V/2.1A USB port, 3 AC outlets, and 1 AC terminal block for convenient connectivity. Includes two 1/0AWG 3ft cables and a 16.4ft wired remote for easy and user-friendly operation. NOTES: Power input should be deep cycle battery of 80% discharge depth and above

RENOGY REGO 3000W Pure Sine Wave Inverter 12V DC to 120V AC for RV Truck

Image of RENOGY REGO 3000W Pure Sine Wave Inverter 12V DC to 120V AC for RV Truck

Product Highlights

  • ✅ 𝐏𝐨𝐰𝐞𝐫𝐟𝐮𝐥 𝐃𝐂 𝐭𝐨 𝐀𝐂 𝐂𝐨𝐧𝐯𝐞𝐫𝐭𝐞𝐫: This car power inverter delivers 𝟑𝟎𝟎𝟎𝐰 𝐨𝐟 𝐜𝐨𝐧𝐭𝐢𝐧𝐮𝐨𝐮𝐬 DC 12V to AC 110V 120V power and up to 𝟔𝟎𝟎𝟎𝐰 𝐨𝐟 𝐩𝐞𝐚𝐤 𝐬𝐮𝐫𝐠𝐞 𝐩𝐨𝐰𝐞𝐫 when the load is started. The car inverter has >𝟗𝟎% 𝐜𝐨𝐧𝐯𝐞𝐫𝐬𝐢𝐨𝐧 𝐞𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐜𝐲, it maximizes battery life, reducing energy loss and saving money on fuel or solar power.
  • ✅ Pure Sine Wave Inverter: The power inverter delivers 頗是裾椙制 & 成政椙菅是裾 逗垂 姓勢晴裾性 just like 摺性世雀 裾是裾頗政性世頗世政栖, protects laptops, televisions, medical equipment, and cpap machines, tools, sensitive electronics from damage.
  • ✅ 𝐀𝐝𝐯𝐚𝐧𝐜𝐞𝐝 𝐒𝐚𝐟𝐞𝐭𝐲 𝐏𝐫𝐨𝐭𝐞𝐜𝐭𝐢𝐨𝐧: The renogy inverter 12V to 110V is 𝐔𝐋, 𝐂𝐄 ,𝐅𝐂𝐂 𝐜𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝, including 𝟔-𝐥𝐚𝐲𝐞𝐫 𝐩𝐫𝐨𝐭𝐞𝐜𝐭𝐢𝐨𝐧, overload/short circuit/overheat/low temperature/reverse polarity/under voltage. 𝐋𝐄𝐃 𝐰𝐚𝐫𝐧𝐢𝐧𝐠 𝐥𝐢𝐠𝐡𝐭𝐬 instantly alert you to issues. 𝐆𝐅𝐂𝐈 𝐠𝐫𝐨𝐮𝐧𝐝-𝐟𝐚𝐮𝐥𝐭 𝐜𝐢𝐫𝐜𝐮𝐢𝐭 𝐢𝐧𝐭𝐞𝐫𝐫𝐮𝐩𝐭𝐞𝐫 prevents electric shocks, ideal for outdoor, boats, rv, truck, cabins, off-grid use
  • ✅ 𝐐𝐮𝐢𝐞𝐭 & 𝐄𝐟𝐟𝐞𝐜𝐭𝐢𝐯𝐞 𝐂𝐨𝐨𝐥𝐢𝐧𝐠: This 3000 watt inverter features 𝐬𝐢𝐥𝐞𝐧𝐭 𝐟𝐚𝐧 and 𝐚𝐥𝐮𝐦𝐢𝐧𝐮𝐦 𝐡𝐞𝐚𝐭𝐬𝐢𝐧𝐤 design, no buzzing or interference. 𝐍𝐨𝐢𝐬𝐞 𝐥𝐞𝐯𝐞𝐥 <𝟔𝟎𝐝𝐛 quieter than normal conversation, perfect for vehicles, tents, bedrooms or offices. Auto-speed fan adjusts cooling based on workload

Renogy Inverter P2 2000W Pure Sine Wave Inverter 12V DC to 110V AC Converter, Off-Grid Solar Power Inverters for Vehicles, Truck, RV, Home, with Built-in 5V/2.1A USB/Hardwire Port, Remote Controller

Image of Renogy Inverter P2 2000W Pure Sine Wave Inverter 12V DC to 110V AC Converter, Off-Grid Solar Power Inverters for Vehicles, Truck, RV, Home, with Built-in 5V/2.1A USB/Hardwire Port, Remote Controller

Product Highlights

  • ✅ 【POWERFUL DC-AC】This 2000 watt inverter is perfect for solar systems. The power inverter 12V to 110V provides 2000 watt continuous DC to AC power, 4000 watt peak surge during load start-up, 12V to 120VAC pure sine wave with conversion efficiency >90%, reduces conversion loss.
  • ✅ 【SAFE FOR USE】This car inverter designed LED indicators for under-voltage and over-voltage protection, over-temperature protection, over-load protection, and short circuit indication. Cooling funs and ground-fault circuit interrupter (GFCI) protection
  • ✅ 【PROTECT YOUR ELECTRONICS】Pure sine wave inverter provides quality AC equivalent to grid power which will protect and extend the life of your electronics and appliances, such as flood light,TV, freezer, laptop,tablet etc. With its quiet and high inductive loads, the solar inverter operates with no buzzing sounds when your electronics are turned on and allow them to run smoother, cooler, and quieter
  • ✅ 【USER-FRIENDLY DESIGN】Renogy inverter come with a built-in 5V/2.1A USB port, 3 AC outlets, and 1 AC terminal block for convenient connectivity. Includes two 1/0AWG 3ft cables and a 16.4ft wired remote for easy and user-friendly operation. NOTES: Power input should be deep cycle battery of 80% discharge depth and above

BESTEK Pure Sine Wave Power Inverter, 400W DC 12V to 110V AC Car Converter

Image of BESTEK Pure Sine Wave Power Inverter, 400W DC 12V to 110V AC Car Converter

Product Highlights

  • ✅ Powerful DC to AC Inverter: Converts 12V DC from your car into 110V AC, providing 400W of continuous DC to AC power and 800W peak surge during load start-up. The advanced pure sine wave technology provides high quality AC power equivalent to grid power, which will protect and prolong the life of your electronics and appliances, such as CPAP machines, nebulizers, air pumps, breast pumps and more.
  • ✅ PD30W & QC18W Fast Charging: 400W car charger adapter quick charge supports PD30W (USB-C port) and QC18W (USB-A port) high output. The PD 30W port provides fast charging for iphone series phones. The 18W Quick Charge 3.0 port can charge most Android devices from 0% to 80% in 30 minutes.
  • ✅ Keep Your Devices Safety Charging: BESTEK 400Watt car power inverter has provided the advanced intelligent circuity safety system to prevent short-circuit, overvoltage, overload, overcurrent, low-voltage and overheating. Equipped with 2 Smart USB charging ports, which detects your devices automatically to deliver its fastest charge speed up.
  • ✅ Smart Temperature-controlled Silent Fan: The cooling fan will automatically rotate at different speed according to power load and temperature, this design can help to reduce the fan noise. Also the high speed cooling fan protect the inverter against overheating. Superior to modified sine wave inverter, greater drive capability, better protection to sensitive equipment, less audible and electrical noise, less power consumption.

BESTEK 500W Pure Sine Wave Power Inverter DC 12V to AC 110V Car Adapter

Image of BESTEK 500W Pure Sine Wave Power Inverter DC 12V to AC 110V Car Adapter

Product Highlights

  • ✅ BESTEK 500W Pure Sine Wave Car Inverter:Its output waveform is same as the AC power waveform of mains power grid which delivers a smoothly-varying sine wave for sensitive electronics provided by the electric utility.Perfects for off-grid system,Lower THD,Less wear,Strong inductive Loads Capability.It has little interference with radios, communication and precision equipment.It's also recommended by most cordless tool manufacturer that a pure sine wave inverter is used to ensure long battery life
  • ✅ This is an inverter converting DC from your car battery to AC for whatever you want to use within its Watt range.It can pull power from the battery through the cigarette lighter plug or directly clamp the alligator battery clips onto the car battery.Plug this into 12v cigarette lighter outlet provides continuous DC to AC power with 2 AC outlets operates any 110v device and 2 USB ports which detects your device automatically to deliver its fastest charge speed up to 2.4 amps per port/4.2 amps max
  • ✅ The Sine Wave Inverter has well placed thermal protection sensors,The aluminum alloy casing with a few ripples,Unique vents and also a built-in FAN which comes ON under NO any loads or when the Inverter becomes Hot Once Powerred. It has 2 x 40 amp/32V external replaceable fuse for protection when hooked up to your battery,readily accessible/replaceable from the back of the Inverter;when hooked to cigarette lighter it will use 15 amp fuse designated to your car.
  • ✅ Isolated Voltage Protects Perfectly for your device from Over-voltage,Under-voltage,Overheat,Overload,Reverse Polarity,Short circuit.it will not drain your battery dry because of an under-voltage protection point.The Inverter does automatically sense overload condition and shuts down AC power when the load exceeds 500W.You will need to power Off/On to reset the overload condition indicated by the Flashing Red.The ON-OFF switch only works for the 3-prong plugs.
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