Qdion QDP650 and QDV850 Line Interactive UPS
Currently, three types of uninterruptible power supplies are most widely used: backup or off-line, linear-interactive, and with double conversion or on-line. Naturally, they seriously differ both in their capabilities and in price. In short, redundant UPSs (off-line, Standby, back ups) are distinguished by the lowest price, but their capabilities are more than modest. Their principle of operation is that at the time of loss of voltage in the electrical network, they switch to work from the built-in battery. Their advantages: profitability, compactness and simplicity. Disadvantages: high battery wear, since there is no stabilization of the input voltage, as well as the lack of adjustment of the shape of the output voltage and the presence of some time for switching. Their usual use is to protect home PCs or simple office equipment, which does not require a good, correct sine wave for their work.
All of the above disadvantages are absent in UPS with double conversion (on-line ups). As the name implies, the electricity in it is converted twice – once to a constant voltage to ensure the correct battery power, and the second – to obtain a stabilized output voltage with the correct sinusoid at the output. The advantages of this approach include the following: complete filtering of any interference from the mains, instant switching to battery operation and reliable and constant stabilization of the output voltage and frequency. Naturally, such a solution is much more expensive than the previous one. The use of these devices is universal, since the user receives an ideal signal at the output. Such UPSs can be used not only for supplying pulsed consumers, but also equipment that places high demands on the quality of the input voltage, both in amplitude and frequency.
And finally, the third type of UPS is line-interactive. It, unlike a simple backup, has a simple automatic voltage regulator (AVR) at the input, which, albeit often in steps, but evens out the input voltage in a wide range without switching the device to power the load from the batteries. This helps to stabilize the input voltage and some of its filtering, which significantly extends the service life of the used batteries and preserves the compactness and economy inherent in stand-by (off-line ups) with a slight increase in cost. Therefore, they are widely used to protect home and office PCs. Due to the time it takes to switch to battery power, the absence of an ideal sine wave at the output and incomplete filtering of the input voltage, linear-interactive UPSs are not used to protect devices that strictly require high-quality amplitude and frequency, but are ideally suited for PCs and other computer equipment.
It is natural that one of the leading manufacturers of uninterruptible power supplies – Qdion company not only produces line-interactive devices, but also provides users with a very wide range of these products. And in particular, it produces a very interesting line of UPS data – Qdion, which are designed for both home and office use. Moreover, these devices are not so much for the consumer. In this review, we will consider two models of this series – QDP650 and QDV850.
Both line-interactive UPS models (QDP650 and QDV850) come in similar boxes. Their difference is that on the front side there is an image of the device and its name. Modestly. And without specifying any technical characteristics.
On the back of the package, too, there is no data on the device. Only advertising phrases are present. All the minimum required parameters of the Qdion UPS are located on the side and top surfaces of the box. There are few of them. But what is necessary for the buyer is indicated, namely: power and Backup Time (backup time) at a load of 120 W are indicated.
Both uninterruptible power supplies (QDP650 and QDV850) have the same equipment, which includes: the UPS itself, a power cord (only for the QDP650 model, since it is rigidly built into the QDV850), a brief instruction manual, and a warranty card. Not a lot, but this is quite enough, although at a minimum, since there is no control software in the delivery.
The front panels of the models under consideration are different, except for inscriptions with the name of the UPS series. On the QDP650, as a simpler model, there is nothing at all except the power button and the green LED. But the QDV850 model already has, in addition to the power button, a small screen indicating the operating parameters. How much it is needed … this is a difficult question, but the user, with his screen, availability, has a feeling of control over the operation of the uninterruptible power supply. In any case, the availability of information is better than its absence.
The flip sides of the QDP650 and QDV850 are also different. They are united only by the presence of the Reset button. But the connectors for connecting external devices vary significantly. It is noteworthy that the simpler model (QDP650) has as many as 4 outputs and they are intended for connecting computer equipment, since the sockets are made according to the IEC-320-C13 standard (3-pin female power connector for alternating current with a maximum load current of up to 10 A ) At the same time, the QDV850 model has only two CEE 7/4 (Schuko) connectors, colloquially incorrectly called "Euro connectors". Due to this, a standard power cord of any computer device can be connected to a more advanced model (QDV850), while a simpler model requires, albeit a very common, but still special cable. In any case, we received models with precisely such output connectors, but there is an indication on the site of the company manufacturing this equipment that other options are possible.
The claimed technical characteristics of line-interactive UPS Qdion QDP650 and QDV850
QDP650 / FSP DP650
QDV850 / FSP DPV850
Power Full / Active
650 VA / 360 W
850 VA / 480 W
Number of phases input / output
Input voltage range
60/50 Hz (auto detection)
60/50 Hz (auto detection)
Voltage stabilization (on battery)
Battery switching time
Battery voltage and capacity
12 V / 7 Ah
12 V / 9 Ah
Number of batteries
Battery Life at 120 W
Overload, discharge and recharge
Overload, discharge and recharge
Less than 40db
Less than 40db
As can be seen from the above table, the used batteries, although they have the same dimensions, but their current, with equal voltage, albeit not by much, is only 2 A, but it is different. Apparently, therefore, with an equal load, a more powerful UPS provides an additional 5 minutes. The batteries themselves are quite reliable, made in China by Leoch, and they successfully resist vibration and mechanical damage, and also hold a good charge during prolonged storage in a charged state. Although deliveries from other manufacturers are possible.
The build quality of the QDP650 and QDV850 UPS models is not satisfactory. Everything is simple and neat. Parts and assemblies are a minimum, and therefore assembly, as well as disassembly (for example, to replace the battery) does not cause any difficulties. At the bottom of the device are a transformer and a battery (as the heaviest products), and at the top is a control board. It is noteworthy that the board used in both models is the same. All the difference lies only in the fact that in a more powerful model (bottom photo), the connector located in the upper left corner of the board is soldered, which is connected to the display that displays data on the operation of the UPS. This approach of the manufacturer significantly reduces production costs and minimizes the costs of the buyer. A small two-color screen not only displays current data on the output voltage, but can also display additional information – input voltage, battery charge, network frequency. The thing is that the screen is touch-sensitive, so when you click on it, you can switch the display modes, as well as activate the backlight, which automatically deactivates after 2 minutes.
Also, one cannot ignore the fact that the FSP company, which previously owned the Qdion brand, has similar device models. So the FSP QDV-850 and Qdion QDV-850 are almost complete analogues of each other, with the possible exception of the nameplate on the front. All system engineering, including printed circuit boards and other internals of the UPS are absolutely identical. This is due to the fact that the UPS line of these manufacturers are produced at the same factory in Taiwan's Voltronic Power company. But at the same time, FSP is positioning its UPSs for sales in the more expensive segment, and exactly the same UPSs under the Qdion brand are supplied at lower prices and are more competitive in the Russian market when compared in terms of price / specification.
For testing, we used: an adjustable transformer (LATR) and an OLDI Game 760 computer based on the Intel Core-i7 4770K processor and the MSI GTX1060 graphics card, which consumes 85 W in idle mode and 450 W at maximum load. The UPS itself in idle mode consumes about 20 watts, and when charging about 45 watts. As befits linear-interactive type power supplies, the quality of the output signal was almost ideal and did not depend on the magnitude of the load and the degree of discharge of the battery. The Qdion QDV-850 operating time at a 10% load at our stand was 25 minutes. The younger model was able to power the load for 19 minutes. At the same time, I want to note that in the battery mode and the load slightly higher than that declared by the manufacturer, the UPS does not experience any problems and continues to operate normally.
The result of testing the operation of the AVR blocks of these UPSs is presented in Table. 2.
Table 2. Test result of operation of the AVR block of the Qdion QDV-850 and QDP-650 UPS
Increase input voltage
Input voltage (V)
Output voltage (V)
Mode of operation
Less than 170
Lower input voltage
Directly from the network
Less than 170
The transition to battery power occurs according to the parameters specified by the manufacturer, which depend on the input voltage and do not depend on the connected load. Unlike most line-interactive models, the AVR voltage boost unit of both Qdion models is two-stage rather than three-stage. This is likely to reduce production costs, but care must be taken to ensure that the overload does not exceed those recommended by the manufacturer, as the UPS will simply shut down.
In general, the new uninterruptible power supplies from FSP leave a good impression. They confidently cope with their main task – protecting connected equipment from power surges. You should especially pay attention to their very attractive cost, because the younger model Qdion QDP 650 can be purchased for only 2200 rubles, and the senior UPS Qdion QDV 850 is sold on average for 3300 rubles. As we have already noted, such a low price is due to the fact that the Qdion series of uninterruptible power supplies was originally planned as the optimal solution for a wide range of users.
. (tagsToTranslate) FSP (t) Qdion (t) ups (t) UPS (t) battery (t) protection (t) uninterruptible power supply (t) line interactive (t) line-interactive (t) QDP650 (t) QDV850 ( t) budget