Frequently Asked Questions

   
Q.1. What is an INVERTER ?  
   
Q.2. What is "VA" ?  
   
Q.3. What is "WATT" ?  
   
Q.4. What is "DIGITAL" ?  
   
Q.5. What is "PWM" based "MOSFET" technology ?  
   
Q.6. What is starting surge load ?  
   
Q.7. What is the right size of inverter for me ?  
   
Q.8. What is an ideal inverter ?  
   
Q.9. Can I run my computer on inverter ?  
   
Q.10. What is the unit of measuring the capacity of a battery ?  
   
Q.11. Does a TUBULAR battery require a different charging set-up than a normal or STANDARD battery ?  
   
Q.12. What factors determine the ‘duration’ or back-up time ?  
   
Q.13. What is the benefit of using extra 12 volt battery for an inverter ?  
   
Q.14. Is the quality of current coming from an inverter the same as main supply ?  
   
Q.15. How often should I top-up my battery and why with distilled water ?  
   
Q.16. Should I leave my inverter on or off when main supply is available ?  
   
Q.17. What is a by-pass switch ?  
   
Q.18. Are all inverters main line compatible ?  
   
Q.19. Why some inverters generate humming sound when on battery mode ?  
   

 
   
1. What is an Inverter ?


An INVERTER is a device or a system that delivers AC power when energized from a source of DC power e.g. lead acid battery. It operates when an interruption in main power supply is there. Then it draws DC current from battery, converts it into AC current with almost the same voltage and frequency as that of the original main power supply. However, the complete system consists of an inverter, charger and battery/batteries. It stores power by converting AC (when main supply is available) to DC and storing the same in battery/batteries and vice-versa taking DC power from battery/batteries (when main supply is not available) and inverting it into AC which runs the connected points as if the main supply is there.
 
 

 
   
2. What is "VA" ?

VA is a unit of apparent power in an AC circuit containing capacitive or inductive reactance. Apparent power is the product of source voltage and current. This term should not be confused with the term WATT.

 
 

 
   
3. What is WATT ?

Unit of electrical power required to do work at the rate of one joule per second. One watt of power is expended when one ampere of direct current flows through a resistance of one ohm. In an AC circuit, true power is the product of effective volts and effective amperes, multiplied by the power factor. Normally, power factor is 0.8. In order to change to watt, multiply by 0.8. For example, 500VA Inverter is actually of 400 watts. However, to determine the actual capacity, the efficiency of the system also has to be taken in account.

 
 

 
   
4. What is DIGITAL ?

DIGITAL: Relating to devices or circuits that have outputs of only two discrete levels. Examples: 0 or 1, high or low, on or off, true or false etc. Level of accuracy of these circuits is almost 100%. Therefore this technology is more reliable. Almost all STYLEX products have digital technology embedded in them giving the best that the latest advancements in microprocessor technology can offer.
 
 

 
   
5. What is PWM based MOSFET technology ?

MOSFET
: Metal Oxide Field Effect Transistor

MOSFET: Metal Oxide Field Effect Transistor MOSFET is a field effect transistor in which the insulating layer between the gate electrode and the channel is a metal oxide layer. PWM: Pulse Width Modulation The output voltage of an inverter is controlled by PWM controls which decrease or increase the voltage as per the varying conditions of the DC voltage (battery) or changing load conditions of the connected load. This smart voltage management gives a very stable AC output. STYLEX incorporates this latest technology to deliver the best results.

 
 

 
   
6. What is starting surge load ?

High charging current that flows into a power supply filter capacitor as the power is first turned on. Appliances having motors or compressors like refrigerator, fan, coolers, ACs have much more surging load than their continuous ratings. Only this load requirement must be taken into consideration while calculating your load requirement.

 
 

 
   
7. What is the right size of inverter for me ?

You can add all the required appliances’ power requirements to determine your actual inverter capacity. Following table will give you an approximate idea of how much power is consumed by most common appliances :

ITEM
POWER CONSUMPTION IN VA
CEILING FAN
100 VA
TUBE LIGHT
60 VA
COLOUR TELEVISION MINIMUM
100 VA
BULB
ACTUAL WATTAGE X 1.25
V.C.R
75 VA
V.C.D.
50 VA
COOLER ( SMALL )
350 VA
COOLER ( DESERT )
600 VA
P.C. ( WITHOUT PRINTER )
300 VA
FAX
75 VA
STEREO
ACTUAL (RMS) WATTAGE X 1.25
MOSQUITO REPELLANT
10 WATTS
CFL 25 WATTS
35 VA
CFL 15 WATTS
22 VA
MOBILE CHARGER
20 VA

We recommend that you buy an inverter that is of slightly higher capacity than you think you need as you will be able to run something else simultaneously. STYLEX offers inverters ranging from 600 VA to 2000 VA to suit almost every domestic/office requirement. Moreover, some appliances like coolers and fans require some extra load (called surge load) initially. While calculating the load requirement, one should take into account this surge load and not the lower running load.
 
 

 
   
8. What is an ideal inverter ?

An IDEAL INVERTER should have the following features:·
  • Must have a built-in reverse polarity protection.
  • Must have a battery deep discharge protection.
  • Must have a built-in by pass system.
  • Must have main line compatibility.
  • Must have a built in auto-reset overload protection.
  • Must have instantaneous change-over facility.
  • Must have wide charging input range from at least 150 to 270 volts.
  • Must have constant current constant voltage 2 step charging system.
  • Must have input low voltage cut-off protection.
  • Must have a battery over-charge protection.
  • Must have input high voltage cutoff protection.
  • Must have all the status displayed on the front panel.
  • Must have an optional UPS mode having an ultra low change over time apart from the usual inverter mode.
      STYLEX inverters offer all the above features to give you the best.

 
 

 
   
9. Can I run my computer on inverter ?

Normally, both sine wave and modified sine wave inverter output will operate a computer. Stylex Home UPS (Inverter) have separate single switch operated option with which one can adjust inverter to domestic load or computer load option.

 
 


   
10. What is the unit of measuring the capacity of a battery ?

The capacity of a battery is measured in terms of AH (Ampere-Hours). This is simply the current storage capacity of the battery that determines the duration of power back-up that the battery will give in absence of mains supply.

 
 

 
   
11. Does a TUBULAR battery require a different charging set-up than a normal or STANDARD battery ?

Yes. Tubular battery requires slightly higher values of current and cut-off voltage than a Standard battery. And Stylex Home UPS offers a convenient change over-switch to charge either Tubular or Standard battery.

 
 

 
   
12. What factors determine the ‘duration’ or back-up time ?

• Back-up duration depends upon battery capacity (ampere-hour) and not on number of plates only.
• Back-up duration can be increased by installing higher capacity battery/batteries.
• Back-up duration can also be increased by installing extra battery/batteries in parallel.
• Back-up time also depends upon battery condition, age and state of charge.

 
 

 
   
13. What is the benefit of using extra 12 volt battery for an inverter ?

Using two 12 volts batteries in parallel instead of one battery shall correspondingly increase the back-up period of your inverter. But normally built-in charging system is designed for one battery. So, if you are using an extra battery, we recommend to install an extra Stylex Charger especially designed for this purpose OR to use Stylex Invacharger .

 
 

 
   
14. Is the quality of current coming from an inverter the same as main supply ?

Ideally it should be the case. STYLEX inverters give a stable frequency of 50 ± 1% Hz and comfortable output voltage of 220 ± 10% volts. This is almost same as normal mains supply.

 
 

 
   
15. How often should I top-up my battery and why with distilled water ?

An ideal inverter shall provide the optimum constant charging current to the battery thereby preventing the gassing (heat from building up) in the battery. This prevents water from evaporating at a brisk rate. STYLEX inverters incorporate CCCV charging which enhances battery life and topping of the battery is considerably reduced. Electrolyte level in the batteries should be maintained such that the plates are always submerged. Impurities present in normal water harm the battery, therefore, only distilled water is recommended.

 
 

 
   
16. Should I leave my inverter ON or OFF when main supply is available ?

The only advantage when you leave your inverter OFF when main supply is available is that you will be able to know when there has been a power cut. But this option will not give you an automatic back-up nor will your battery be charged during mains supply period. Also unnecessary discharge of the battery will not be there.

 
 

 
   
17. What is a by-pass switch ?

It is a built-in manual switch through which total system can be bypassed in case of any fault in the unit. The main advantage is you can avoid disconnecting the inverter and connecting the load directly. STYLEX inverters incorporate this as a standard feature.

 
 

 
   
18. Are all inverters main line compatible ?

No! Because all inverters do not have a bypass protection system. STYLEX inverters have a built-in by-pass switch in most of the models.

 
 

 
   
19. Why some Inverters emit humming sound when on battery mode ?

This is mainly due to poor quality of components used in the circuit and also due to poor or faulty design and assembling techniques. There is negligible sound when you use STYLEX inverters.