HT8750-EUCLA - Car charger Cotech - Free user manual and instructions

Product Type	Car Charger (DC to AC Power Inverter)
Model	HT8750-EUCLA
Brand	Cotech
Input Voltage	12 V DC (12.5 V nominal)
Output Voltage	230 V AC, 50 Hz (Modified Sine Wave)
Maximum Output Power	500 W (100 W via cigarette lighter plug)
USB Output	5 V DC, 500 mA
Fuse Rating	12 A / 250 V (in cigarette lighter plug)
Operating Temperature	-20°C to +40°C
Protection Features	Overload cutout, overheat cutout, low voltage shutdown (10.5±0.3V), overvoltage shutdown (15.5±0.5V), short circuit protection
Dimensions (approx.)	200 x 100 x 50 mm
Weight (approx.)	0.8 kg
Mounting	Fixed installation with screws (not supplied) on a flat, firm surface
Included Cables	Cable with cigarette lighter plug and cable with battery clips; also terminal lugs for permanent wiring
LED Indicator	Green LED: on when powered; flashing indicates a fault
Output Waveform	Modified sine wave (staircase type)
Safety Certifications	CE, WEEE (responsible disposal)
Maintenance	Wipe with damp cloth; no solvents; store in dry, ventilated place
Reparability	Fuse replaceable in cigarette lighter plug; other repairs by qualified technician using genuine parts

Frequently Asked Questions - HT8750-EUCLA Cotech

What is the maximum power I can draw from this inverter?

The inverter can supply up to 500 W continuous. However, when using the cigarette lighter plug, the maximum load is limited to 100 W. For loads above 100 W, use the battery clips or permanent wiring.

Why is the green LED flashing?

A flashing green LED indicates a fault: low battery voltage, overload, overheating, or a short circuit. Check the troubleshooting chart in the manual and let the device cool down if overheated.

Can I use the inverter with a 24V battery?

No, the HT8750-EUCLA is designed for 12 V systems only. Connecting it to a 24 V battery will destroy the inverter. Use the 24 V model (HT8754-EUCLA) for 24 V systems.

How do I install the inverter permanently?

Use 6 mm² cable if less than 3 m from battery, or 10 mm² for longer runs. Install a 50 A fuse on the positive (+) cable near the battery. Connect red to positive (+), black to negative (-). Ensure proper ventilation.

What appliances can I power with this inverter?

Most 230 V appliances with a power rating up to 500 W. Note that sensitive electronics (e.g., medical devices) or rechargeable products may require a pure sine wave and may not work properly. The inverter produces a modified sine wave.

Can I charge my phone via the USB port?

Yes, the USB port provides 5 V DC, 500 mA for charging small devices like smartphones. It does not support data transfer.

How do I replace the fuse in the cigarette lighter plug?

Unscrew the yellow cap anticlockwise, remove the center pin and spring, take out the old fuse, and insert a new 12 A / 250 V fuse. Reassemble in reverse order.

What does the overload shutdown do?

If the connected load exceeds 500 W (or 100 W via cigarette plug), the inverter will automatically shut down to prevent damage. Reduce the load and restart.

Can I use the inverter in the engine compartment?

No, do not install the inverter in the engine compartment. It should be placed in a well-ventilated area away from direct sunlight, moisture, and flammable materials.

What is the difference between a pure sine wave and modified sine wave?

A pure sine wave is smooth like grid power, while a modified sine wave has a stepped shape. Some devices (e.g., pumps, motors) may run noisily or inefficiently on modified sine wave. For sensitive equipment, use a pure sine wave inverter.

USER MANUAL HT8750-EUCLA Cotech

Read the entire instruction manual carefully and make sure that you fully understand it before you use the equipment. Keep the manual for future reference.

Viktig information:

Exterior view of a COTECH 500 watt converter device (no visible text or symbols beyond branding)

ART.NO

18-2532

18-2542

36-4439

36-4442

MODEL

HT8750-GBCLA

HT8754-GBCLA

HT8750-EUCLA

HT8754-EUCLA

Ver. 20180914

Original instructions

Bruksanvisning i original

Please read the entire instruction manual before use and save it for future reference. We reserve the right for any errors in text or images and for making any necessary technical changes to this document. If you should have any questions concerning technical problems please contact our Customer Services.

Safety

• 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.
• Do not cover the product.
• The product must only be connected to a 12/24 V cigarette lighter socket (or equivalent) with the centre pin positive (+).
• The product must be protected from direct sunlight, rain and moisture.
• Never immerse the product in water.
• Never open the product. Repair work on the product must only be done by a qualified technician, using genuine spare parts, otherwise there is a risk that the product may cause accident or injury.
  • Always disconnect the battery connections before servicing or adjusting the product.
• Take great care when using lead-acid accumulators. Avoid causing sparks when connecting the product.
• Keep the product out of the reach of children. Remember that the output voltage is just as dangerous as the voltage from a standard wall socket.
• If a cable or connector is damaged it must be replaced. Use only genuine spare parts from the supplier.
• Never use unnecessarily long cables between the voltage converter and the power source. A long cable causes loss of voltage.
• Check the polarity of the cigarette lighter socket before connecting the product. The centre pin of the socket must be positive (+).
• If the product is connected with reversed polarity it may suffer damage. Such damage is not covered by the warranty.
• Make sure that no devices are connected to the product before plugging it into or unplugging it from the cigarette lighter socket.
• Check that the voltage converter, cable and connector are undamaged before you use them.
• Do not cover the product. Make sure that the ventilation openings are clear.

• Do not use the product to power medical devices or other sensitive equipment. Consult the user guide to determine the type of power supply the product requires, e.g. sine-wave, voltage variations, earthing. Ask an expert if you are uncertain.

• Never connect the product to a 230 V AC supply.

• Do not use the product in any way other that that described in this user guide.
• The product must not be used by children or by individuals with reduced physical or mental ability. It must not be used by individuals with insufficient experience and knowledge, unless they have been instructed in its use by someone who is responsible for their safety.
• Never allow children to play with the product.
• Do not use the product in explosive environments, in the vicinity of flammable liquids or gases or in very dusty surroundings. Sparks may be produced when the product is connected or disconnected.
• Never unplug cables by pulling on them and do not carry the product by connected cables.

Special safety regulations for voltage converters

• Use only the cable that belongs to the appliance powered by the product.
• Never alter or modify connectors that will be connected to the product.
• The mains lead of the device to be powered by the voltage converter must not be more than 2 metres long.
• Never connect a damaged or incomplete appliance.
• Check that the cables connected to the car battery or the cigarette lighter socket are clean and undamaged.
• Make sure that the polarity is correct.
• Do not install the product in the engine compartment.

Note: Some rechargeable products do not work well with voltage converters since voltage converters produce a modified sine wave. To work properly, rechargeable products usually need a pure sine wave such as that supplied by standard wall sockets. The voltage converter or the rechargeable product may suffer damage, so rechargeable products should always be connected to a standard wall socket.

• The problem does not arise with most products powered by rechargeable batteries. Most of these use a separate charger or transformer which is connected to a wall socket.
• The product works with most chargers and transformers of this type.

Description of the product

• The converter converts 12/24 V DC (direct current) to 230 V AC (alternating current, staircase sine wave).
• It can power most 230 V appliances with a power rating of not more than 500 W.
• Connecting leads for a car battery and a cigarette lighter socket are supplied.
  • Maximum load: 500 W (100 W for a cigarette lighter socket).
• Overload cutout.
  • Overheat cutout.
• Shuts down if the input voltage falls below 10.5 ± 0.3 V on 36-4439 and 18-2532, or 21 ± 0.6 V on 36-4442 and 18-2542.
• Shuts down if the input voltage goes above 15.5 ± 0.5 V on 36-4439 and 18-2532, or 31 ± 1 V on 36-4442 and 18-2542.
• Shuts down in the event of a short circuit.
  • USB port: 5 V DC/500 mA.

Front

1. Fixings for fixed installation
2. USB port: 5 V DC, 500 mA
3. 230 V AC, 50 Hz
4. Green LED
5. ON/OFF

Back

1. Negative (-) earth connection, black cable
2. Fixings for fixed installation
3. Positive (+) 12 V connection, red cable (36-4439 HT8750-EUCLA, 18-2532 HT8750-GBCLA) Positive (+) 24 V connection, red cable (36-4442 HT8754-EUCLA, 18-2542 HT8754-GBCLA)

Assembly

The product has fixings for fixed installation. Install the product on a flat, firm surface. Use suitable screws (not supplied) and make sure that there is sufficient ventilation. Take extra care when installing the product in marine environments. Use stainless steel mounting components and make sure that the product is not exposed to damp, moisture, or water splashes.

Use

NOTE: Take care with the polarity: red cable (+) to the red terminal and black (-) to black.

Before using the product, make sure that it is undamaged. If it is damaged, do not use it.

Note: Make sure that you have the right product, the 12 V model for 12 V batteries and the 24 V model for 24 V systems. If a 12 V converter is connected to a 24 V system it will be destroyed. The products do not work with 6 V batteries.

Note: The 230 V outlet and the USB port can be used at the same time, but make sure that the total load of the connected appliances does not exceed 100 W if you are using the cable with the cigarette lighter plug, or 500 W when using the cable with battery clips or a permanently-wired installation.

Connecting the supplied cable with cable lugs and a plug for a cigarette lighter socket

• The cable is suitable for appliances rated at up to 100 W. For appliances above 100 W, use the cable with battery clips or install permanent cables directly from a 12/24 V battery (see under Connecting with permanent cables).
• Do not use the product in positive-earth (+) electrical systems. Such systems were used in older vehicles.

• The centre pin of the cigarette lighter plug is positive (+). The metal sides are negative (-).

• Make sure that the ON/OFF button is set to OFF (0).

• Connect the cable to the terminals on the back of the product (observe the correct polarity). Tighten firmly but do not over-tighten.
• Connect the plug to the cigarette lighter socket or to another socket in the car/boat/caravan, etc.
• Press the ON/OFF button so that it is in the ON position (I). The green LED lights up if the product is connected to a working 12/24 V power source. This indicates that the 230 V and USB outputs are ready to be used.

Note: If the green LED flashes, something is wrong. Check the safety regulations and the troubleshooting chart in the user guide.

Connecting the supplied cable with cable lugs and battery clips

Do not use the product in positive-earth (+) electrical systems. Such systems were used in older vehicles.

1. Make sure that the ON/OFF button is set to OFF (0).
2. Connect the cable to the terminals on the back of the product (observe the correct polarity). Tighten firmly but do not over-tighten.
3. Connect the battery clips to the battery (observe the correct polarity).
4. Press the ON/OFF button so that it is in the ON position (I). The green LED lights up if the product is connected to a working 12/24 V power source. This indicates that the 230 V and USB outputs are ready to be used.

Note: If the green LED flashes, something is wrong. Check the safety regulations and the troubleshooting chart in the user guide.

Connection with permanent cables (not supplied)

• Make sure that the ON/OFF button is set to OFF (0).
• Do not use the product in positive-earth (+) electrical systems. Such systems were used in older vehicles.

• If the length of the cable run is less than three metres, use 6 mm ^2 cable. If the cable run is longer than three metres, use 10 mm ^2 cable. For clarity, it is advisable to use red cable for the positive (+) side and black for the negative (-) side.

• Run the cables from the product to the battery, taking care that they are not trapped and cannot be damaged by sharp edges etc.

• Whichever cable cross-section is used, install a fuseholder for a 50 A fuse on the positive (+) cable close to the battery.

• Connect the cables to the terminals on the back of the product (observe the correct polarity). Tighten firmly but do not over-tighten.

• Secure all cables with cable ties and make sure that all connections have been properly tightened.

• Fit a 50 A fuse to the fuseholder and connect the positive (+) cable to the battery.

• Connect the negative (-) cable to the battery.

• Press the ON/OFF button so that it is in the ON position (I). The green LED lights up if the product is connected to a working 12/24 V power source. This indicates that the 230 V and USB outputs are ready to be used.

Note: If the green LED flashes, something is wrong. Check the safety regulations and the troubleshooting chart in the user guide.

USB port

The USB port does not support data transfer. Its only purpose is to supply power (5 V/500 mA) to products that are powered from a USB port.

Powering a circulation pump etc. with an inverter

An inverter can be used to power a circulation pump provided that the rated power of the inverter is appropriate for the circulation pump. A circulation pump has a very high starting current (it draws more current on starting than the stated current, up to three times as much as in normal operation), so the rated power of the inverter must be twice (or even three times) higher.

The reason why a sine wave inverter is often used for circulation pumps is that such pumps can be noisy if powered from a square wave (or even a modified “staircase” sine wave) supply.

The noise is due to the rapid changes of phase caused by the square (or modified sine) wave. This gives rise to resonances in the pump windings and these may be propagated via copper pipes etc connected to the pump.

An inverter that delivers a square (or modified sine) wave may be accepted in an emergency, but an inverter that delivers a sine wave is preferable for quieter running.

The difference between a square wave, a modified "staircase" sine wave and a pure sine wave:

Three abstract line drawings on a grid background: rectangular, stepped, and smooth wave (no text or symbols)

Fuse replacement

The cigarette lighter plug contains a fuse. To change the fuse:

1. Unscrew the yellow top of the plug by turning it anticlockwise.
2. Remove the centre pin and the spring.
3. Take out the fuse.
4. Fit a new fuse of the same type and size (12 A/250 V).
5. Put back the spring and the centre pin.
6. Refit the yellow top by turning it clockwise.

Technical illustration of a mechanical component with exploded view, showing threaded body, connector, spring, and end cap (no text or symbols)

Care and maintenance

• In storage, the product must be kept in a well-ventilated location out of the reach of children.
• When the product is stored or transported in a vehicle, make sure that it is located where it cannot be damaged and where it cannot injure passengers in the event of severe braking or avoidance manoeuvres.
• Do not expose the product to direct sunlight, intense heat or moisture.
• If the overheat cutout operates, let the product cool down for at least 15 minutes before starting it up again.
• When the product is not in use, switch if off and disconnect it from the battery.
• Before cleaning the product, switch it off and disconnect it from the power source. Wipe the product with a damp cloth.
• Never use solvents or powerful cleaning agents.

Measuring the alternating voltage

The inverter delivers alternating voltage in the form of a modified square wave. This means that the voltage must be measured with a voltmeter that measures “TRUE RMS” for a correct reading. A different type of voltmeter will give a reading that is 20 to 30 V lower than the actual voltage.

Troubleshooting chart

• Switch off the product immediately if there is a problem.
• Disconnect devices connected to the product.
• Check connected devices and all connections.

Low or zero output voltage.

Check all cables and connections.The product has poor contact with the battery.Check the connections.Check that the fuse in the input cable is sound. There is also a fuse in the cigarette lighter plug (see under Fuse replacement).

The green LED is flashing.

The battery voltage is low. Charge the battery.The input voltage is too high. Check the battery and its power supply (alternator and charging relay).The overload cutout has tripped. Check all supplied devices.The overheat cutout has tripped. Switch off the product and let it cool down for at least 15 minutes.There is a short circuit somewhere in the system. Check all cables and connections.The inverter is faulty. Contact our customer service.

Responsible disposal

This symbol indicates that this 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.

Symbol of a trash bin crossed with no text or labels, accompanied by a black rectangular block below (no readable text or symbols)

Specifications

Model HT8750-EUCLA 12 V HT8754-EUCLA 24 V HT8750-GBCLA 12V HT8754- GBCLA 24 V

Input voltage 12.5 V DC 24 V DC

Output voltage 230 V AC, 50 Hz 230 V AC, 50 Hz

Max. output power 500 W 500 W

USB 5 V DC, 500 mA 5 V DC, 500 mA

Fuse 12 A/250 V 12 A/250 V

Working temperature -20 to +40 °C -20 to +40 °C

Three abstract waveforms on a grid background: rectangular pulses, stepped blocks, and a smooth sinusoidal waveform (no text or symbols)

Byte av säkring

Illustration of four different mechanical components with no visible text or symbols

Symbol of a trash bin crossed with no text or labels, accompanied by a black rectangular block below (no readable text or symbols)

Specifikationer

Modell HT8750-EUCLA 12 V HT8754-EUCLA 24 V HT8750-GBCLA 12V HT8754-GBCLA 24 V

Inspänning 12,5 V DC 24 V DC

Utspänning 230 V AC, 50 Hz 230 V AC, 50 Hz

Max. uteffekt 500 W 500 W

USB 5 V DC, 500 mA 5 V DC, 500 mA

Säkring 12 A/250 V 12 A/250 V

Arbetstemperatur -20 till + 40 °C

-20 till + 40 °C

Spenningsomformer/vekselretter 500 W

ART.NR. 18-2532 MODELL HT8750-GBCLA

18-2542

HT8754-GBCLA

36-4439

HT8750-EUCLA

36-4442

HT8754-EUCLA

1. Feste for fast montering
2. USB-port 5 V DC, 500 mA
3. 230 V AC, 50 Hz
4. Grønn LED-lampe
5. På/Av

Bakside

1. Tilkobling for minus (-) jord, svart kabel
2. Feste for fast montering
3. Tilkobling for pluss (+) 12 V, rød kabel (36-4439 HT8750-EUCLA, 18-2532 HT8750-GBCLA) Tilkobling for pluss (+) 24 V, rød kabel (36-4442 HT8754-EUCLA, 18-2542 HT8754-GBCLA)

Montering

Produktet har feste for fast montering. Monter på en plan stabil flate.

Three abstract waveforms on grid backgrounds: rectangular pulses, stepped blocks, and a smooth sinusoidal waveform (no text or symbols)

Skifte av sikring

Det sitter en sikring i sigarettennerpluggen. For å skifte sikring:

Technical illustration of a mechanical component with exploded view, showing threaded body, connector, spring, and end cap (no text or symbols)

Symbol of a trash bin crossed with a diagonal line, no text or numbers present

Spesifikasjoner

Modell HT8750-EUCLA 12 V HT8754-EUCLA 24 V

HT8750-GBCLA 12V HT8754- GBCLA 24 V

Spenning inn 12,5 V DC 24 V DC

Spenning ut 230 V AC, 50 Hz 230 V AC, 50 Hz

Three abstract waveforms on grid backgrounds: rectangular pulses, stepped blocks, and a smooth sinusoidal waveform (no text or symbols)

Sulakkeen vaihto

Technical illustration of a mechanical component with exploded view, showing threaded body, connector, spring, and end cap (no text or symbols)

Huolto ja ylläpito

Symbol of a trash bin crossed with no text or labels, accompanied by a solid black rectangle below (no text or symbols present)

Tekniset tiedot

Malli HT8750-EUCLA 12 V HT8754-EUCLA 24 V

HT8750-GBCLA 12V HT8754- GBCLA 24 V

Tulojännite 12,5 V DC 24 V DC

Three abstract line drawings on grid backgrounds: rectangular shapes, stepped blocks, and a smooth sine wave (no text or symbols)

Technical illustration of a mechanical component with threaded end and side brackets (no text or symbols)

Pflege und Wartung

Symbol of a trash bin crossed with no text or numbers, representing waste sorting or disposal (no text present)

Technische Daten

Modell HT8750-EUCLA 12 V HT8754-EUCLA 24 V

HT8750-GBCLA 12V HT8754-GBCLA 24 V

10 – 13 Market Place

Kingston upon Thames

Surrey

KT1 1JZ

DEUTSCHLAND

Kundenservice Hotline: [phone]

E-Mail: [e-mail]

Homepage

www.clasohlson.de

Postanschrift