Inverter, generally can be divided into two kinds, one is sine wave, one is square wave, some engineers also like to put the quasi sine of another class, which is sine wave, quasi sine wave, square wave.
1. Sine wave, its output waveform is the same as that of the mains we use, but its output waveform is better than that of the mains, so this product is suitable for all electrical equipment. But its price is higher. Generally used for high precision equipment, detection, research and development, military and other places. And for home appliances, we do not have to use what high requirements of the machine, so this product in the market is not much, is generally custom-made buyers.
2. Quasi sine wave, this is a popular product, its conversion efficiency, cost performance is better than sine wave, the applicability of the load ratio of the sine wave, but for household appliance, such as TV, computer, acoustics, the motor under 1000 w, etc., and see how much worse than sine wave, and it has a low price, in the small power inverter power supply, it is the mainstream products.
3. Square wave, output is a square wave, its carrying capacity is poor, for the general perceptual load will produce a large harmonic component, so for the motor, TV will have a relatively large noise. This kind of product is early use power frequency transformer do, already is Amoy state product.
For buyers, how to determine whether the inverter is suitable for their use. A few points are summarized:
Check the power of your appliance
Determine its peak power
Input voltage, current, frequency
Peak power: The amount of power required to turn an appliance on at the moment you turn it on. For example, TV, electric drill, you open instant can call sound, voltage jump and so on is the impact of electric appliances open instant. So, peak power is different from rated power. Generally speaking, resistive load, such as light bulbs these loads are not the peak problem, but such as inductive, capacitive electrical appliances, there is generally 3 to 5 times the peak, therefore, we buy inverter should pay attention to, because the inverter is double the peak. Such as television, nominal rated power 75W, but the peak is 5 times, which peak is 350W, so you use 100W inverter is not open up, because 100W inverter main 200W peak, so we have to use 300W machine, it has 600W peak, of course, can open up.
Electrical peak: bulb, there is no peak,100W inverter, can light 100W bulb, TV, there is 3 to 5 times the peak,75W TV, to use more than 300W machine start, electric drill,3 to times the peak, computer monitor, generally more than 6 times. So it’s a little hard to start a 300W machine. For portable computers, generally 70W, 150W inverter can start, because it is generally 3 times the peak value (210W peak value), for mobile phone chargers, cameras and other digital products, the general use of 100W inverter is enough.
How do you determine how long a battery will last?
The capacity of the battery is measured in ampere hours (AH), which means the maximum amount of energy discharged by the battery in an hour. For example, a battery is called 100AH, so we can say that it can continuously output a maximum of 100A current in an hour. So, we can use this value to calculate how long it takes a battery to drive a load.
Four 14A DC12V 300W bulbs for use
Battery working time = battery voltage * battery capacity/load power * inverter efficiency
2.5 = 12* (14*4) /300*80%
The discharge current of a battery
3KVA eight 12V batteries battery termination voltage 10.5 set load power 2000W (working appliances)
Battery termination voltage 10.5*8=84V
When discharging, calculate current load power/termination voltage/inverter efficiency =2000/84/80%=29A
Look for batteries with termination voltage 10.5V and current 29A hours such as 12v to 30A
Termination voltage: indicates the lowest operating voltage when the battery discharges. The termination voltage is different for different battery types and discharge conditions.