HIPER LES-1200 is a line-interactive uninterruptible power supply that differs from many similar devices in the type of battery. While most UPSs are still equipped with lead-acid batteries, HIPER has opted for durable and compact lithium iron phosphate cells (LiFePO4).
⇡#Technical specifications, price
The hero of the review is the senior model in the series of miniature HIPER UPSs based on LiFePO4 batteries and is designed for active power of consumers up to 720 W, and the battery capacity is 6 A h at a voltage of 25.4 V. According to other passport data, HIPER LES-1200 does not stand out from the range of budget UPSs presented in Russian retail. Consumer protection means are represented by a step voltage regulator without a current limitation function for voltage surges and filtering of electromagnetic interference. The device itself is protected by an automatic switch with a rated current of 6 A.
ManufacturerHIPER Model LES-1200 Topology Line-interactive Output Apparent power, VA 1200 Active power, W 720 Nominal voltage, V 200–255 Nominal frequency, Hz 50 Voltage waveform Approximated sine wave Switching time 2-6 ms, max. 10 ms Battery-powered connectors with Schuko CEE 7 protection, 2 pcs. Input Voltage range, V 145-290 Frequency range, Hz 45-65 Power connector IEC C18 Batteries Type Lithium iron phosphate Installed 25.6 V/6 Ah, 1 pc. Battery life From 10 min. (200 W) Protection and filtering Short circuit Yes Line mode overload Yes Battery mode overload Yes Deep battery discharge Yes Automatic voltage regulator (AVR) Yes High-voltage surge protection No Communication, control and administration USB charging for mobile devices Yes PC communication USB Type-B Physical characteristics and properties Dimensions, W × H × D, mm 85 × 141 × 305 Net weight, kg 5 Cooling Active Retail price RUB 7,999 (dns-shop.ru)
HIPER LES-1200 is sold in the DNS online store at a price of 7,999 rubles.
⇡#Appearance, delivery set
Unlike many other budget UPS, HIPER LES-1200 is assembled in a metal case. Only the upper part of the front panel is made of plastic, which can be white or black, as indicated by the UB or UW mark in the full name of the product.
A small blue-backlit display shows the UPS output voltage and battery charge level, and also indicates an overload condition. Next to the display is the power button and a single USB Type-A power port.
For connecting the main consumers, the HIPER LES-1200 has only two Euro sockets. The USB Type-B connector is used for software monitoring and control. The input cable of the HIPER LES-1200 is removable, which again not all budget UPS can boast of.
Finally, there are two 8P8C connectors on the back panel of the case, but they are directly connected to each other without any additional components. However, the LAN protection function is not stated in the specifications of the device.
⇡#Internal structure
HIPER LES-1200 has very modest dimensions for the declared power and capacity of the battery, and weighs only 5 kg. The secret is in lithium-iron-phosphate batteries, which significantly surpass lead-acid analogues in energy density (200 and 80–90 W h / l, respectively).
In this case, the battery is assembled from eight 32700 cells connected in series, which gives a voltage of 25.6 V with a capacity of 6 Ah. A bundle of two lead-acid batteries, which have similar electrical parameters (24 V and 7 Ah), would take up twice as much space. The manufacturer promises that the battery will withstand at least a thousand charge cycles, which is a fairly conservative estimate for LiFePO4 cells. Inside the battery is a BMS (Battery Management System) board, which ensures balancing of charge and discharge between individual cells.
The UPS requires active cooling with a 50mm fan that is active in AVR mode and when powered by the battery. A transparent divider directs the incoming air flow through the battery cells.
All UPS electronics, except for the BMS board, are assembled on a single printed circuit board. Electrolytic capacitors are represented by Chinese brands.
⇡#Software
HIPER LES-1200 is not detected in the system as a battery when connected via USB, and the monitoring and automation functions are performed by the PowerManager II program. It can be installed from the CD supplied with the device or downloaded from the link on the manufacturer’s website, but the disc will be useful to the buyer in any case, since the program license key is printed on its envelope.
According to the disk label, the software is designed for operating systems from Windows 98 to Windows 7. But, as it turned out, PowerManager II works without problems in the Windows 11 environment. The program has all the necessary features, including demonstrating the UPS operating mode, input and output voltages, and most importantly, setting up emergency shutdown scenarios (which also work in Windows 11).
⇡#Testing methodology
To create an adjustable load on the UPS, we used a power supply test bench with a connected power supply of the required power. To measure the AVR range and voltages at which the transition to battery power occurs, we used an adjustable transformer FNEX TDGC2-2K, and to record the output signal shape, we used an oscilloscope OWON VDS1022I.
⇡#Test results
The HIPER LES-1200 automatic voltage regulator switches to a lower value when the input voltage exceeds 249 V, and the output voltage in this case is 216 V. The other winding of the transformer is activated when the input voltage is less than 202 V, increasing it to 242 V. An input voltage of less than 173 V is a signal to switch to battery power.
In the linear and AVR modes, the permissible power of consumers connected to the UPS is about 700 W, which is close to the declared 720. At higher values, the device gives an audible signal about overload and switches off after a few seconds.
In stand-alone mode, the power for which the HIPER LES-1200 is designed is much lower for several reasons. The first of them is that the transient process under a load of 200 W and above takes up to 30 ms, and a computer PSU according to the ATX standard will last without power for 17 ms at most. The UPS maintains an acceptable switching time of 15 ms only under a moderate load of 150 W and below.
Load 150 W
Load above 150W
If you apply a load to the UPS after a power failure, thereby skipping the transient process, it should not exceed 350 W, otherwise a protective shutdown occurs. With a consumer power of about 300 W, voltage fluctuations at the output periodically occur in the range from 169 to 254 V, and after four minutes, the “Hi” symbols light up on the indicator display and the device switches off again. Assuming that the UPS signals battery overheating, immediately after switching off we measured its temperature, which was 54 °C. According to most sources, the operating temperature of LiFePO4 batteries of size 32700 should not exceed 60 °C, which explains the behavior of the HIPER LES-1200.
The optimal load for the hero of the review in autonomous mode is 150 W. With this power, the UPS produces a stable voltage of 220 V and operates without interruption for 32 minutes. The signal shape is close to square pulses.
⇡#Conclusions
HIPER LES-1200 is a very inexpensive UPS for the 720 W power declared by the manufacturer, but it should be considered as a reserve for operation in voltage stabilization mode. The device is designed primarily to protect office PCs with a power of up to 150 W – only in such conditions is correct operation possible when powered by a battery. The operating time under a load of 150 W is 32 minutes according to our tests. The lithium iron phosphate battery has more than enough capacity for such a load and will live much longer than the lead-acid batteries that prevail in UPSs.
Another scenario of operation that is suitable for HIPER LES-1200 (especially due to the miniature size of the device) is powering such low-power equipment as network routers and home NAS. It is a pity that the UPS is not detected as a battery via the USB interface, and proprietary software is required for monitoring and setting up emergency shutdown scenarios.
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Source: 3dnews.ru
