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Current Consumption Chart & Power Calculation

Power Calculation

Before purchasing an Inverter, it is necessary to calculate the power requirements of the loads that are going to be connected. Mid size inverter (500VA to 800 VA) will handle most of the low power household appliances.

If you wish to use 2 Fans, 2 Tube lights and 1 TV, the total power consumption will be around 380 Watts. Power loss in the inverter is estimated as 1.15. So the Inverter capacity should be at least 380×1.15. That is 437 VA. The suitable available size is 500 VA. Inverter rating is usually given in VA (Volt Ampere). The backup time of the inverter depends on the type and capacity of the battery used. Battery capacity is represented in Ah (Ampere hour). To power the whole house (say 3000 watts), more planning is necessary. A 5 KVA inverter is necessary in this case. But obviously not every appliance will be ‘ON’ at the same time. So a high capacity inverter is a good choice because, if the load increases above the rated capacity of the inverter, it can lead to hazardous results.
If a 24 Volt inverter with 24 volt battery is used, backup time can be doubled. But the cost of the inverter and battery will be high compared to a 12 volt inverter and 12 volt battery.

Power loss in Inverter and Current consumption during charging.
No inverter can function efficiently. The working of the inverter depends on many factors like conducted load, battery efficiency and maintenance. During operation, inverter will heat up and the transformer will dissipate heat. So some energy will be lost which reduces the efficiency. Proper charging of the battery and its efficiency to hold charge are two very important aspects. Input voltage from the AC lines should be close to 230 volts for proper charging of the battery. Fully charged battery will show 13.8 volts. Inverter should switch on charging immediately when the battery voltage reduces to 12 volts. Charging current depends on the time taken to complete the charging process and also the ‘charge condition’ of the battery. If the battery is discharged to 80% of its efficiency, it will take 5 to 7 Ampere current for charging during the first few hours. Then the current reduces to 500 milli amperes or less. A fully charged battery will not take any current. Most inverters have two mode charging-Boosts charging and Trickle charging. During boost charging, around 5 to 7 ampere current will utilized and during trickle charging only 25 to 50 milli ampere current will be utilized.


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