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FAQ Inverter


1. Which are the Characteristics of an inverter?

- The inverter is a simple case intercalated between the mural electrical outlet and the whole of your materials. It profits now from a better design making it almost invisible in your environment. - It is used to prolong a certain time the food of your materials which use all the alternative course, at the time of a frank cut of food or microcut.

- For that the inverter automatically will rock on the spare battery which is its essential component, and you thus will have a few minutes of autonomy (from 5 to 15 following models) sufficient to safeguard your data before extinguishing your materials. This battery lasts one approximately four year lifespan and can be naturally changed as on a vehicle. There exist the batteries with plates of lead and electrolyte (idem that on cars) and of the accumulators to iron-nickel. The first do not support to be discharged a long time (2/3 hours) and the seconds on the other hand are to be supervised each month for a technical maintenance of discharge and refill. - But this battery producing only D.C. current, it will have to generate using special elements of the alternative course. You go by the same occasion power to choose other advantages which are not to neglect knowing as: The electric tension of the sector (and thus the current) are prone to overpressures, sometimes short ou/et strong, but always prejudicial with your computer which detests the variations of food. One calls this phenomenon of the peaks of tension. -

Contrary there exist voltage drops, due to the startup of engines, elevators, electric radiators for the cold periods… that your materials do not appreciate either. - Finally there exist parasites which can induce the tubes neons, unquestionable driving domestic without forgetting the shaver, or quite simply the EDF line which is of bad quality. - The inverter can also protect from the lightning which generates enormous peaks of tension, being able to go until the destruction of complete materials or components. But to protect itself from the lightning the means available (financially) to the level domesticates are of an effectiveness often quite relative! Choice? The choice is summarized with two principal criteria, the power of the inverter and its technology. Its power: Is determined according to your configuration and measures themselves in GOES = voltampere. The inverters according to the model have a power of protection ranging between 300 and 780 GOES and + if need be. - to begin made the list of the apparatuses protect (central processing unit, monitor, printer, keyboard, mouse, modem, disc of external safeguard, scanner, enclosures, .....) and note the consumption of each one of them.

You find these values either with the back of the apparatuses on a plate, or in the note of use, and then: has) - you add these values in amps, and multiply the result by 230 i.e. the value of the tension of the current network, which gives you Volts Amps. B) - you can also record values in Watts, which you multiply by 1.4 what still gives you of the Volts Amps = approximate calculation. You must always choose a model of inverter whose power of protection is higher than that which you need, and I advise you to provide you with your card to speak about it with your supplier who will guide you more easily and will be able to possibly correct errors slipped into your calculations. Some points to be supervised. It is necessary that your inverter has at least 3 or 4 catches minimum to connect your materials, and that its switch is easily accessible. A button of test is desirable for regularly checking the good performance of the inverter and the load of battery. And like always, check that the cables, note in French are quite present and which type of guarantee is applicable.

CAUTION: If you are connected to the Internet, certain inverters offer also a protection with dimensions phone line. If not with the help of a few euros moreover, you can find a catch special of connection and protection of the Fax apparatus/modem which acts by filtering of the phone line. In general the inverter protects the computer and the monitor (to make it possible to safeguard the work in progress but it is necessary to be present) and on the other hand the peripherals are cut of current but are protected nevertheless from overpressures.


2. How To choose its inverter?

The role first of an inverter is to protect your computer from the variations and interruptions from tension. Indeed, according to your place of residence, the cuts (or µcoupures) of electricity, the brownouts or overpressures are more or less frequent.
These defects of tension cause the stop or the sudden restarting of your machine and its peripherals. This results in to make you lose the not safeguarded works in progress and that can sometimes in the long term damage your computer material: all is a question of chance and bad luck.

Most current inverters protective systems against the dependant lightning and overpressures include: it should be known that even if these systems are not completely ineffective, they do not protect rigorously and with 100% your material of this phenomenon, as name seems to indicate it. Indeed, the lightning remains a not easily quantifiable phenomenon and badly controlled. In addition, do not forget only if you are on Internet, the lightning can strike the phone lines and dependant overpressure will destroy at least your modem if not besides other components in your PC: all this to say that as much to avoid making use of its PC in very stormy weather, inverter or not.

To choose its inverter, it is advisable to understand the broad outlines of its operation. An inverter is composed of three great internal parts:

- A continuous alternate transformer followed by a battery charger which makes it possible to maintain the load of an accumulator.

- The battery (the accumulator) it even.

- An inverter which makes it possible to transform the tension continues from the battery in alternating voltage compatible with your computer.

The power provided to your computer and possibly to its peripherals comes only from the transformation of the continuous tension (from the battery) into alternating voltage. Under normal functioning, the battery is reloaded permanently while being solicited but quite charged it is able to function a few times only and without contribution of energy: it is the description of the principle of operation of an on-line inverter.

An inverter offline has this of different that in order to save on the manufacturing costs, it delivers the tension sector (filtered all the same) directly with the computer as long as this tension is correct in terms of level. As soon as the tension passes below a certain threshold, the inverter then will commutate on the internal battery.
Owing to the fact that the inverter offline, contrary to on-line inverter, continuously does not deliver a tension coming from the batteries it can occur a problem at the time of the commutation of an energy source with another (passage of the sector to the battery thus). However, the power supplies of the current computers are of type with cutting and integrate large condensers able to face very short cuts (also called µcoupures) of the sector and these systems can thus depend on inverters of the offline type because they are able to compensate for the short switching time (a few milliseconds) between the cut sector and the transfer to the battery of the inverter.

In the event of brownout of the sector, of µcoupure, cut a little longer or of overpressure, you thus know now why the power provided to your computer will not vary: energy will be taken on the reserves of the battery.
According to the total power consumed by the peripherals to connect and of the autonomy desired in the event of total cut of the sector, you must thus choose the power of your inverter.
According to the type of need: personal computer or waiter containing of the extremely significant data for example, you also know if you must choose or not for a model respectively offline or on-line.
I benefit from this page to also speak about the surge protectors (sometimes also usually called lightning protectors): those, less expensive, will protect your material from overpressures as their name indicates it but they will not act as inverter. In fact, in the event of cut or µcoupure, your computer will start again and the not safeguarded data in progress will be lost. Nevertheless, it has the advantage of making it possible to protect all your equipment (peripherals understood) from the most dangerous phenomenon for their lifespan: overpressures.
That you live a a little moved back area where the tension sector provided is not always free from defect and/or that you want to protect your computer material like your data i.e. to be on not being stopped during your work, the investment remains rather reasonable, even for a private individual, especially if one relativizes it with the purchase of a complete computer.
Also note that obviously the use of an inverter is very highly recommended (not to say essential) for all the waiters intended to turn uninterrupted.
To protect and supply thus a traditional computer with its screen (rather one 15' ` rather than one 17' `) but *sans* its other peripherals, even the smallest inverter (300VA) could be enough: however the autonomy without the sector will then be reduced and of approximately 10 minutes.
Even if this proves generally completely sufficient to safeguard your work and to extinguish your computer, considering the very reasonable price difference, it seems much wiser to me to choose directly a model with 500VA which will give you definitely more autonomy for a data-processing station and will allow you to connect a larger screen like one 17' `, one 19' ` or even one 21' `.
Thus in a more precise way, in order to ensure an effective protection in the event of total cut of the sector, it is advisable to dimension the power of the inverter according to what you wish to connect on the latter: if you exceed the values for which the inverter was designed, protection in the event of cut will not function a priori correctly.

Here thus average powers to envisage for an inverter (GOES from there) in order to connect various peripherals:
Element approximate Powers to envisage
(for an operation in autonomy)
Traditional PC without screen (CPU) 150 GOES
Screen 14/15 ` ` 80 GOES
Screen 17 ` ` 180 GOES
Screen 19 ` ` 250 GOES
Screen 21 ` ` 300 GOES
Printer traditional jet of ink 80 GOES
Laser writer 1000 GOES
Waiter (on small with large and all also depends on desired autonomy!) 300 to 700 GO even much more!
Of course it is advisable to make the sum of the powers (GOES from there) of the peripherals which you wish to connect. Thus, you can note that a traditional PC accompanied by its screen 15' ` can be actually connected on an inverter of 300VA but that this same traditional PC accompanied by sound 17' ` is likely slightly to exceed the limit of the 300VA: as indicated previously, considering the price difference, then to choose an inverter of 500VA as much. You will also note that one should not hope to make go a laser writer on an inverter:).
Information + (1): considering the operation of a portable, an inverter is not necessary to be protected from the power cuts. On the other hand, there remains useful to protect the external transformer from the portable of overpressures.





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