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Basic knowledge of inverters(2)

  • 257
  • Jimmy at
  • June 25, 2018

Q: How should the inverter be connected to power and load?

Answer: Using the electric appliance below 150 watts can plug 150 watts inverter directly into the socket of cigarette lighter to use. More than 150 watts of inverters are connected directly to the battery via a crocodile clip wire, red to the positive pole of the battery, and black to the negative pole of the battery. If the power is located far from the battery, the principle of the inverter connection is: the connection between the inverter and the battery should be as short as possible, and the output line of 220 v ac should be as long as possible.


Q: How much power can the car cigarette lighter socket output?

Answer: Take electricity from the cigarette lighter socket, the inverter should be able to drive more than 100 watts of power appliances. But some customers reported that after a few minutes of P4 laptop, the inverter would automatically cut off power and alarm. We know that the power consumption of the P4 laptop is about 90 watts, which is high. Due to some models from the battery to the cigarette lighter socket that electricity is not in conformity with the provisions for the use of wires and cigarette lighter socket, have increased in the circuit when the current is bigger loss, make the supply voltage of inverter fell sharply to the under-voltage protection circuit action point - 10 v, cause the inverter stop power supply. To solve this problem, and to ensure the normal, safe and reliable use of inverter, users are advised to keep the circuit wiring for copper core quality lines of the sectional area of 2.5 square millimeter above, and if necessary replace the cigarette lighter socket.


Q: Can an on-board inverter be used when the car engine is turned off?

A: Yes. When using below 350 watts of small power electrical appliances, car battery can provide 30 to 60 minutes of power in commonly shut down engine. If only using a consumed 50-60 watts of notebook computer, it will last longer. Our standard sine wave inverter with under-voltage warning and under-voltage protection circuit, when use the battery for a long time led to the decrease of the voltage to 10 v, under-voltage protection circuit, the output voltage is cut off and call the police, in order to prevent the battery voltage is too low and cannot be started because the engine of the accident. Therefore, the user can safely use the inverter when the engine is closed.


Q: What if you want to use the inverter for a long time without starting the engine?

Answer: Another same voltage battery is connected with the positive and negative poles of the original battery respectively with a thick enough wire. In this way, the independent use time of the inverter can be greatly extended.


Q: What is the danger of using a inverter?

Answer: The conductor is carrying a very large current from the car battery to the inverter input, If the quality of the conductor is poor, the conductor is too thin or the load exceeds the standard, the copper wire will become hot or even fire, which will cause serious accidents. Therefore, in the use of the inverter, the operation must be strictly in accordance with the user manual.


Q: How do you know the battery capacity?

A: The battery is printed with a lot of letters and Numbers. You can find the XXAH to see how large a battery it is. Let's start with the meaning of AH. A stands for amp, the unit of current, and H stands for hour. The two letters together mean "ampere hour", which is how much amperage current can be continuously output in an hour. The previous XX is usually two Numbers, namely the number of amps. For example, 45AH means that the battery can be output in an hour.


Q: What type of battery do ordinary family cars use?

A: Small cars with less than 1.3 liters are equipped with 40-45 amps, medium cars with 1.6 to 2.0 liters are equipped with 50-60 amps, and medium and large cars with 2.2 liters or more are equipped with 60-80 amps. The batteries for suvs and utility vehicles are generally larger than those for cars with engines of the same size. As to the voltage of battery, general use 12 v battery cars, use of diesel engines (including vehicles) most use 24 v battery, a few still use 12 v battery (e.g., iveco).


Q: How to equip the battery with the appropriate inverter?

A: If the battery is 12 volts at 50 amps, we multiply it by 12 volts at 50 amps, and the output power of the battery is 600 watts. If the inverter is 90% efficiency, then we multiply 90% by 600, and we get 540. This means that your battery can drive an inverter with a maximum output power of 540 watts. Of course, you can also take a "one-step" approach to purchasing an 800-watt inverter, regardless of the current size of the battery in your car. It is then used within the range permitted by the current battery and at full power when larger cars are replaced in the future. Finally, the power requirements for the inverter are not high, say 100 watts, so you can buy a small power inverter. In addition, in the power of the inverter, there is another important principle, namely when using inverter, not full load operation for a long time, otherwise it will shorten the life of inverter, the inverter failure rate will increase significantly. We strongly recommend the user to use the inverter at least 85% of the rated power.


Question: Why do you use the regular multimeter to measure the ac output of the pre-sine-wave inverter, and the voltage is over 220 volts?

A: This is normal, because when measuring ac voltage of quasi sine waves, a multimeter with a "true RMS" range should be used to get the correct reading.