Comparison Kemot SER-2000 2 kVA / 1500 W vs REAL-EL STAB ENERGY-2000 2 kVA / 1600 W

The maximum active power load permissible for this model.

Active power is the power consumed by AC devices for useful work or heat generation. Additionally, such devices consume reactive power — used for the function of specific components, primarily capacitors and inductive coils. The apparent power, measured in volt-amperes (kilovolt-amperes), is the sum of active and reactive power; see below for more on that. Here, we note that in simple household situations, active power data in watts is usually sufficient for calculations. This parameter is considered key when choosing voltage stabilizers for washing machines and for dishwashers: for the former, an optimal power range is from 2 to 5 kW, and for the latter, from 1.8 to 2.5 kW.

Regardless, the total active power of the connected load should not exceed the figures specified in the stabilizer's specifications. For full assurance, it's wise to have some reserve, though it shouldn't be too large — increasing permissible power significantly affects the size, weight, and price of the device. It's also worth mentioning that there are formulas to convert active power consumption to apparent power, considering the type of connected electrical appliance; these formulas can be found in specialized sources.


It should be noted that manufacturers don't always specify power in watts, sometimes only providing values in kVA. In such case...s, we apply an approximate conversion. Overall, while the value is approximate, it adequately describes the stabilizer's capabilities and helps match specific needs.

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 rate at which the regulator responds to changes in input voltage. It is determined by the time that passes from the moment of a power surge until the moment when the device fully adjusts to the new parameters and the output current corresponds to the standard 230 or 400 V (depending on the number of phases, see above). Accordingly, the shorter the response time, the better the stabilizer works, the lower the likelihood that a power surge will significantly affect the connected equipment. On the other hand, not all types of electrical appliances are sensitive to speed — for some, smooth adjustment or voltage accuracy is more important (see above); and the high speed itself can significantly affect the price of the device. Therefore, when choosing by this parameter, it makes sense to consider which devices are planned to be connected through the stabilizer.

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%.