Comparison Gresso M1500VA 1.5 kVA / 1050 W vs Kebo SR-1000D 1 kVA

The maximum active load power allowed for this model.

Active power is the power that in AC appliances is spent on useful work or on heat generation. In addition to it, such devices also consume reactive power — it goes to the operation of specific components, primarily capacitors and inductors. Apparent power, denoted in volt-amperes (kilovolt-amperes), is the sum of active and reactive, see below about it. Here we note that in simple everyday situations, there is enough data on active power indicated in watts for calculations. In particular, it is this parameter that is considered the key when choosing stabilizers for washing machines and dishwashers : in the first case, power from 2 to 5 kW is considered optimal, in the second — from 1.8 to 2.5 kW.

Anyway, the total active power of the connected load should not exceed the figures indicated in the characteristics of the stabilizer. For a full guarantee, it's ok to take a certain margin, but this margin should not be too large — an increase in the allowable power significantly affects the dimensions, weight and price of the device. Also note that there are formulas that allow you to convert the active power consumption into total power, taking into account the type of connected electrical appliance; these formulas can be found in special sources.

Maximum apparent load power allowed for this model

In electrical engineering, full power is called, which takes into account both active and reactive power; the first type of power is discussed above, and the second can be described as the effect of windings, inductors and capacitors on the operation of AC networks. Apparent power is the main parameter for calculating loads on equipment in professional electrical engineering; it is usually denoted in volt-amperes (VA), in the case of stabilizers — in kilovolt-amperes (kVA). Note that for convenience, different types of power in electrical engineering are denoted by units with different names. That is why the power in W indicated in the characteristics of the stabilizer is usually not equal to its power in VA.

When choosing a stabilizer for some household appliances, it is quite enough to have active power data, but if possible it is better to use the full one. In particular, it is this parameter that is key when looking for a stabilizer for a refrigerator or a stabilizer for a boiler : in the first case, 0.4 – 1 kVA is considered the optimal value, in the second — from 0.1 to 0.7 kVA. However, anyway, it is necessary to choose a specific model in such a way that its total power is not lower than the total power of the entire connected load — and it is better to have a reserve (in case of unforeseen circumstances or connecting additional eq...uipment). At the same time, note that powerful models are distinguished by large dimensions and weight, and most importantly, high cost; therefore, it does not always make sense to chase the maximum numbers.

Also note that there are formulas that allow you to derive the optimal total power of the stabilizer based on data on active power and type of load; they can be found in special sources.

The voltage range at the input of the stabilizer, at which it is able to operate in normal mode and supply a constant voltage of 230 or 400 V to the load (depending on the number of phases, see above). The wider this range — the more versatile the device, the more serious power surges it can extinguish without going beyond the standard operating parameters. However, note that this parameter is not the only, and not even far from the main indicator of the quality of work: a lot also depends on the accuracy of the output voltage and the response speed (see both points below).

Also note that some models may have several modes of operation (for example, with 230 V, 230 V or 240 V output). In this case, the characteristics indicate the "general" input voltage range, from the smallest minimum to the largest maximum; the actual ranges for each particular mode will vary.

In addition, there are stabilizers that can operate outside the nominal input voltage range: with a slight deviation beyond its limits, the device provides relatively safe output indicators (also with some deviations from the nominal 230 or 400 V), but if the drop or rise becomes critical, it works appropriate protection (see below).

The largest deviation from the nominal output voltage (230 V or 400 V, depending on the number of phases), which the regulator allows when operating in the normal input voltage range (see above). The smaller this deviation, the more efficiently the device works, the more accurately it adapts to “changes in the situation” and the less voltage fluctuations the connected load is exposed to.

When choosing for this parameter, it is worth considering first of all how demanding the connected devices are for voltage stability. On the one hand, high stability is good for any device, on the other hand, it usually means a high price. Accordingly, it usually does not make sense to buy an advanced stabilizer for an unpretentious load like light bulbs and heaters, but for sensitive devices like audio systems or computers, it can be very useful.

The efficiency of the stabilizer is the ratio, expressed as a percentage, between the amount of electricity at the output of the device to the amount of energy at the input. In other words, efficiency describes how much of the energy received from the network the device transfers to the connected load without loss. And losses during operation will be inevitable — firstly, not a single transformer is perfect, and secondly, the control circuits of the stabilizer also require a certain amount of energy to work. At the same time, all these costs are quite small, and even in relatively simple modern models, the efficiency can reach 97-98%.

The type of voltmeter provided in the design of the stabilizer, or rather, the type of scale used by this device. By itself, this voltmeter allows you to monitor the voltage — usually both at the input and at the output — which makes it easier to monitor the operation of the stabilizer. For this, two separate scales are most often provided, but there are also "single" voltmeters, with a switch to select between input and output voltage. And according to the type of scales, there are such options:

— Analogue. Analogue voltmeters are equipped with a traditional type scale — with graduations and an arrow printed on it. They are simpler and cheaper than digital ones, but less accurate — even in the thinnest devices, the error of indications can be 5-10 V only because of the peculiarities of reading information from such a scale. And in some inexpensive models, analogue voltmeters play the role of general indicators rather than precision instruments. At the same time, for most everyday tasks, such accuracy is quite enough.

— Digital. In such voltmeters, the role of the scale is played by a digital indicator, on which voltage values can be displayed with an accuracy of up to a volt — this is the main advantage of this option over the analogue one. Of the shortcomings, it is worth noting the complexity and rather high cost of digital pointers. In addition, such high accuracy can be critical in the professional field, but in every...day life it is not always required. Accordingly, in low-cost low-power stabilizers, a digital voltmeter is often more of a marketing ploy than a real need.

The number of standard 230 V sockets provided in the stabilizer. Note that such sockets are not suitable for devices that require grounding (see below).

The number of sockets for 230 V with grounding provided in the design of the stabilizer.

Some electrical appliances, such as refrigerators and washing/dishwashers, must be grounded when connected. This point should not be ignored — there is a risk of a serious electric shock. Accordingly, the number of sockets with grounding corresponds to the maximum number of such devices that can be simultaneously connected to the stabilizer without the use of splitters. At the same time, ungrounded devices can also be connected to such sockets.

The ability to use a stabilizer to protect communication lines using RJ-11 or RJ-45 connectors ; the first is usually used in telephone lines, the second — in wired computer networks, although other options are possible. Anyway, wired lines are also susceptible to interference and power surges, and network equipment can be quite sensitive to such troubles. Thus, some stabilizers are able to smooth out fluctuations also on communication lines.

Please note that RJ-11 and RJ-45 are not mutually compatible. Therefore, when buying a model with this function, it is necessary to clarify what connectors it is designed for — otherwise adapters may be needed, and in the worst case, the device will be completely useless.