HT8711 - Uncategorized Cotech - Free user manual and instructions

Product Type	Power Inverter (12V DC to 230V AC)
Model	HT8711
Input Voltage	12V DC (cigarette lighter socket)
Output Voltage	230V AC (modified square wave)
Continuous Power	100W
USB Output	5V DC, max 500 mA
Dimensions (L×W×H)	170×80×60 mm
Fuse Rating	12A / 250V, 6×32 mm
Idle Current Consumption	0.2 A
Protection Features	Low voltage (10.5V), overvoltage (16V), short-circuit, overload (>100W), overheating
Indicator Light	Blue (normal operation), Red (protection tripped)
Mounting	Designed for car cup holder
Usage	Indoor use only (vehicle interior); not for engine compartment
Compatible Devices	Low-power devices (e.g., laptops chargers, digital cameras, MP3 players, stereos, etc.)
Incompatible Devices	High-energy or heat-producing devices (hair dryers, microwaves, toasters); sensitive medical equipment; devices requiring pure sine wave
Maintenance	Clean with soft cloth and mild detergent; do not use abrasive cleaners or solvents
Fuse Replacement	Only with identical rating (12A/250V); ensure all small components (center pin, spring, plastic washer) are correctly reassembled
Repair	Do not open; repairs by qualified personnel using original spare parts
Disposal	Recycle according to local regulations (EU WEEE directive)

Frequently Asked Questions - HT8711 Cotech

What is the maximum continuous power output of the Cotech HT8711 inverter?

The inverter is rated for 100W of continuous power. Ensure connected devices have a power consumption lower than 100W.

Can I use the inverter with a hair dryer or microwave?

No, the inverter is not intended for high-energy or heat-producing devices such as hair dryers, microwave ovens, or toasters. It is designed for low-power electronics like laptop chargers, cameras, and MP3 players.

What does the red indicator light mean?

A red indicator light means the inverter's protective function has tripped due to low voltage, overvoltage, short-circuit, overload, or overheating. Disconnect the load, address the issue, and reset by turning the inverter off and on.

How do I reset the inverter after a protection shutdown?

To reset, turn the inverter off using the power switch, then turn it back on. Ensure the cause of the trip (e.g., overload, short circuit) has been resolved before resetting.

Can I charge a laptop using the inverter?

Yes, you can charge a laptop by plugging its AC adapter into the 230V AC socket on the inverter, provided the laptop's power consumption is below 100W. Alternatively, use the USB port if the laptop supports USB charging (5V/500mA).

Is the inverter suitable for medical equipment?

No, the inverter must not be used as a power supply for medical or other sensitive and vital equipment. It produces a modified square wave, which may not be compatible. Consult a tradesman for power requirements.

What type of waveform does the inverter output?

The inverter produces a modified square wave, not a pure sine wave. Some sensitive devices (e.g., certain medical equipment or audio devices) may not function properly. Check the device's instruction manual or consult a tradesman.

How do I replace the fuse?

Unscrew the ridged part of the cigarette lighter plug to access the fuse. Note the position of all small components (center pin, spring, plastic washer). Replace the fuse with one of the same rating: 12A/250V, 6×32mm. Reassemble all components exactly as before.

Can I use the inverter while the car's engine is off?

Yes, but ensure the vehicle's battery is fully charged to avoid draining it too much. The inverter has low-voltage protection that shuts it off when battery voltage drops below 10.5V DC.

What should I do if the inverter gets too hot?

If the inverter overheats, it will automatically shut off. Turn off the connected load device and let the inverter cool for about 15 minutes. Ensure ventilation holes are not blocked and avoid placing it in direct sunlight or near heat sources.

USER MANUAL HT8711 Cotech

Please read the entire instruction manual before using the product and save it for future reference. We reserve the right for any errors in text or images and any necessary changes made to technical data. If you have any questions regarding technical problems please contact Customer Services.

Safety

Warning!

- Make sure that the socket that the product is plugged into is easily accessible so that you can quickly disconnect it and the product from the mains when needed.

- Do not connect products of this type to each other.

- The power inverter can only be connected to a 12 V cigarette lighter socket with a (+) positive centre.

- The power inverter must be protected from direct sunlight, rain and moisture.

- Never open the inverter yourself, repairs should be carried out by qualified personal using original spare parts, otherwise the product could become dangerous to use.

- Always disconnect the cigarette lighter plug before servicing or carrying out any adjustments to connected lead appliances. - Be very careful when handling lead-acid batteries, avoid sparking all the terminals.

- Keep the inverter out of children's reach; remember that the voltage from it is as dangerous as that from a regular wall socket.

- If the mains lead or other cables on the inverter are damaged they have to be replaced. Use only original replacement parts from the supplier.

- This product can be used in vehicles but should never be mounted in the engine compartment.

- If you connect an auxiliary socket to the 12 V battery, the connection cables between the battery and the socket must be kept short, max 2 metres.

- Never use longer leads than needed between the inverter and the load appliance, the longer the lead the higher the voltage drop.

- Check the polarity from the cigarette lighter socket before connecting the inverter. The power socket must have (+) centre-positive polarity.

- Reversed connection can damage the inverter, and is not covered by the guarantee.

- Do not have any load devices connected to the inverter when you are connecting or removing the plug from the cigarette lighter socket.

- Make sure the lead and plug are undamaged before using the inverter.

- The inverter must not be covered. Make sure the ventilation holes are kept open and unblocked.

- Never use the inverter as a power supply for medical equipment or other sensitive and vital equipment. Read the device's instruction manual for power supply requirements. In regards to sine waves, voltage variations, earthing, etc. Consult with a tradesman if you are uncertain.

• For indoor use only.
- This product is not intended for powering products with high energy consumption or products which give off heat such as hair dryers, microwave ovens, toasters, etc.
- Keep an eye on the temperature of the battery charger that is connected to the inverter. If it becomes hot after about 10 minutes the charger should then only be connected to your normal residential power grid.
- Never connect the inverter to a 230 V power grid or other inverter.
- Never use the inverter near flammable liquids or gas. Sparks may be produced when connecting or disconnecting the inverter.
- The inverter may not be immersed in liquids or exposed to rain or spray.

Product description

• 12 V DC to 230 V AC power inverter.
Connects to your car's 12 V cigarette lighter socket.
- Designed to be placed in your car's cup holder.
- Allows 2.5V devices (lvs, digital receivers, stereo, etc.) to be used in your car, boat, caravan, etc. Can also be connected to battery chargers for laptops, digital cameras, drill/drivers, etc.
- USB outlet for charging digital cameras, MP3 players, etc.
[5 V, max. 500 mA].
■ Built-in overseas protection and low-voltage protection.
- Rated for 100 W of continuous power

The Indicator lamp /

On/off switch

shines blue when the inverter is connected and on and is red when its protective function has trioped.

Use

1. Connection:

A. Plug the inverter into the car's cigarette lighter outlet (12 V). B. Push the on/off switch to switch the inverter cn.
C. The indicator light will be blue when the inverter is switched on and correctly connected.
D. Finally: Connect the load device's plug to the outlet on the inverter.

2. Switching off:

A. Push the on/off switch to switch the inverter off.
B. The indicator lamp will go off.
C. Disconnect the inverter from the car's cigarette lighter outlet.
D. Finally: Disconnect the load device from the Inverter's outlet.

1. Place the inverter in your car's cup holder or other appropriate location, well protected from rain and moisture and with good air circulation so the inverter does not overheat. Also, do not place the inverter in direct sunlight or near heat sources.

2. Press the power switch to start the inverter.

3. The indicator light will be blue when the inverter is switched on and correctly connected. This shows that the inverter is functioning correctly and both the 230 V AC socket and USB port are ready for use.
   N.B. If the indicator light is red then a problem has occurred. Refer to The inventor's protective features.
4. Both the USB port and 230 VAC socket can be used at the same time
5. The inverter can manage 100 W of continuous power. Make sure that the load devices have a lower power consumption than 100 W.
   All electrical products have a rating for power consumption listed in A or W.

Example: If power consumption is given in A you would

calculate W as follows: A rating of 2.2 A (230 V AC) =

power in W: 2.2 × 230 = 506 W

1. Press the power switch to switch off the inverter.

N.B. Pull the plug out when the inverter is not in use.
N.B. Make sure that the vehicle's battery is fully charged when using the inverter without the engine turned on. Make sure that you do not drain the battery so much as to cause starting problems.
N.B. The USB port on the inverter does not support data transfer. It is only an outlet providing 5 V/500 mA DC for charging/powering USB devices.
Warning! Do not connect any sensitive devices which need are wave AC voltage (the inverter produces a modified square waveform). Check the product's instruction manual or consult a tradesman if you are at all uncertain.

The inverter's protective features

• Low voltage protection: Low voltage is not damaging to the inverter but can damage the connected load device. The inverter shuts off when battery voltage goes below 10.5 (+/-0.3) V DC.
  • Overvoltage/Surge protection: The inverter shuts off when battery voltage exceeds 16 (1/-0.3) V DC.
• Short-circuit protection: The inverter shuts off automatically whenever a short-circuit is detected.
• Overload protection: The inverter shuts off automatically when overloaded (power output over 100 W).
  • Overheating protection: The inverter shuts off automatically when the temperature becomes too high. Turn off the connected load device and let the inverter cool for about 15 minutes.
• Reset the protective features by: Shutting off the inverter and starting it again.

Note!

• Disconnect the inverter from the battery before starting the vehicle or before recharging the battery.
• Disconnect the inverter when it is not in use.
• Discharged batteries are sensitive to frost, recharge batteries before storing them.

Care and maintenance

Cleaning: Unplug the inverter from the power outlet and wipe it with a soft cloth and maybe even a little mild detergent. Never use abrasive cleaning agents or solvents.

Troubleshooting

• If the inverter is switched on but does not have output voltage from the VAC or USB outlets then in all probability the inverter's protective functions have tripped. The indicator light will be red if a problem has occurred. Reset the protective features when you have addressed the problem, Shut off the inverter and start it again.
• Make sure that your car's cigarette lighter socket outputs 12 V (certain cars must have the ignition switch in the on
  position in order to receive power from the socket).

• Check the fuse in the inverter's plug:

• Unscrew the ridged part of the plug to access the fuse while keeping track of the small components (centre pin, spring and plastic washer).
  N.B. All the small components must be replaced in exactly the same position otherwise the inverter will
  not function.

• Replace the fuse only with one of the same rating (12 A/250 V).

Responsible disposal

This symbol indicates that the product should not be disposed of with general household waste. This applies throughout the entire EU. In order to prevent any harm to the environment or health hazards caused by incorrect waste disposal, the product must be handed in for recycling so that the material can be disposed of in a responsible manner.

When recycling your product, take it to your local collection facility or contact the place of purchase. They will ensure that the product is disposed of in an environmentally sound manner.

Specifications

Model

Input voltage

Idling consumption 0.2 A

Weight

Weight

170×80×60mm

Fuses

6×32mm 12A/250V

Protective features

Integrated low-voltage, overload,

short-circuit, overload and

high-temperature protection.

Spänningsomvandlare

Art.nr 18-1233 Modell HT8711-GB 36-4021 HT8711-EU