How much kva inverter do i need
What is the difference between modified sinewave and pure sinewave? Inverters have either modified sinewave squarewave or pure sinewave output. Some of its advantages are as follows: Output voltage waveform is pure sine wave with very low harmonic distortion and the same as the ESKOM supply Inductive loads like microwave ovens and motors run correctly, quieter and cooler Reduces audible and electrical noise in fans, fluorescent lights, audio amplifiers, TV, Game consoles, Fax, and answering machines Prevents crashes in computers, unreadable print outs, and glitches and noise in monitors It can be efficiently electronically protected in overload, overvoltage, undervoltage and over temperature conditions Modified Sinewave Inverter The Modified sinewave inverter has limitations.
How do I connect an inverter? What type of battery should I use? How long can I run the appliances from the inverter? This depends on the battery size selected and the type of batteries used. Can I connect two or more batteries? Batteries connected in series. Below is the power consumed by these items:. It stands for the Volt ampere rating. It is the voltage and current supplied by the inverter to the equipments. This efficiency is also called power factor of an inverter and is simply the ratio of power required by the appliances to power supplied by an inverter.
Power factor of most inverters ranges from 0. Here average value of power factor or efficiency is considered i. In the market VA inverters are available. So an inverter with VA will be the right choice for your home. Battery is the backbone of an inverter system. The performance and life of an inverter largely depend upon the battery quality. This is what is called the battery capacity. It is the battery capacity that decides the back up hours.
It is expressed in Ah Ampere Hours. When you connect batteries in series, you increase voltage. In the battery world, it is better to limit your parallel strings. It is better for your power system. In this example, I would recommend using six-volt batteries because of the number of batteries this example requires. How do we charge these batteries? You will need a charger to charge the batteries when you have access to city power.
In this example, you will need at least a amp charger, if not bigger. The bigger the charger, the faster the charge. Make sure your charger is for volt batteries because the system we just identified is a volt system. You will also need cables. For this example, a 4 AWT cable is required to handle watts of startup power. That is huge cable. You may also want to consider an inline fuse.
A amp for this example is perfect. To figure out the size of fuse, you divide your AC watts startup by DC voltage. You would need a amp fuse or bigger. The inverter system also has some charging system that charges the battery during utility power. During utility power, the battery of the inverter is charged and at the same time power is supplied to the loads in the house.
When utility power fails, the battery system begins to supply power via the inverter to the loads in the home as shown below:.