Prostar PER1103+Li 2U lithium UPS 3000VA 48v online double conversion, designed to provide continuous, conditioned power for servers, networking equipment, telecommunications systems, and other critical electronic loads. Featuring online double-conversion technology, a 48V lithium battery system, and a compact 2U chassis, this UPS combines power protection with flexible installation options.
Its standout design feature is a 90-degree rotatable LCD display, allowing the same unit to be installed as either a rack mount UPS or a tower UPS. This dual-orientation design helps businesses adapt to different equipment layouts without selecting separate UPS models for different installation environments.
Modern IT Infrastructure Needs More Than Basic Backup Power
Servers, network switches, storage devices, telecommunications equipment, and industrial control systems depend on a stable electrical supply. Even brief interruptions, voltage fluctuations, or power-quality disturbances can disrupt operations, interrupt communications, or cause unexpected equipment shutdowns.
Traditional standby UPS systems may not provide the continuous power conditioning required by sensitive electronic loads. Meanwhile, conventional rack-only UPS installations can be inconvenient for businesses operating mixed equipment rooms, small server cabinets, branch offices, and facilities with limited floor space.
Battery selection presents another challenge. Businesses increasingly consider lithium batteries for backup power because lithium-based systems can offer different maintenance, monitoring, and service-life characteristics compared with conventional lead-acid batteries. However, a lithium UPS must also provide appropriate battery management compatibility and electrical protection.
These challenges create several practical requirements:
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Continuous power conditioning for sensitive electronic equipment.
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Sufficient active power capacity for the intended load.
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Compact installation in a standard equipment rack or on a suitable tower stand.
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Reliable communication between the UPS and monitoring systems.
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Battery protection and configurable charging parameters.
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Efficient operation without unnecessary energy losses.
The Prostar PER1103+Li 2U lithium UPS addresses these requirements through an integrated online UPS platform with flexible installation, lithium battery compatibility, and multiple communication options.
2U Lithium UPS with Online Double-Conversion Technology
Online Double-Conversion Technology for Continuous Power Conditioning
The PER1103+Li uses online double-conversion technology. In normal operation, incoming AC power is converted to DC and then inverted back to AC, helping isolate the connected equipment from variations in the incoming electrical supply.
Unlike standby UPS designs that normally supply utility power directly to the load, an online double-conversion UPS continuously supplies power through its conversion stages during normal online operation.
This architecture is suitable for applications where power continuity and output quality are important, including servers, network infrastructure, telecommunications systems, and selected industrial electronics.
The PER1103+Li specifies 0ms transfer time from AC mode to battery mode and from battery mode to AC mode. This means the specified operating-mode transitions do not require a break in output power. Transfer between inverter and bypass is specified at 4ms, so bypass operation should be evaluated separately when assessing power continuity requirements.
Its pure sine wave output, battery-mode voltage regulation of ±1%, and battery-mode frequency accuracy of ±0.1% support sensitive loads requiring controlled AC power.
A Compact 2U Lithium UPS for Space-Constrained Installations
The PER1103+Li has a chassis measuring 440 × 420 × 88 mm, occupying 2U of vertical rack space in rack-mounted installations.
A compact 2U lithium UPS can help IT integrators preserve rack space for servers, switches, storage systems, and other equipment. Its form factor is particularly relevant to installations where the available rack height is limited.
The unit light weight, making it relatively straightforward to position compared with larger UPS cabinets, subject to the installation and rack-support requirements.
For projects without a dedicated server rack, the PER1103+Li can also be configured for tower installation. The 90-degree rotatable LCD allows the screen orientation to match the selected installation position, improving display readability without requiring a different UPS model.
Lithium Battery Compatibility with Integrated Protection
The PER1103+Li supports LiFePO4 lithium batteries as well as lead-acid batteries. Its nominal battery-system voltage is specified as 48VDC, with 51.2VDC nominal for the LiFePO4 configuration.
The UPS provides configurable charging current from 1A to 30A, with a default setting of 5A. It also specifies smart battery management, automatic restart, and self-test functions.
For compatible lithium battery configurations, the documented battery management protection functions include:
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Overcharge protection.
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Over-discharge protection.
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Overcurrent protection.
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Short-circuit protection.
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Overtemperature and undertemperature protection.
Native support for Pylontech RS485 and CANbus protocols is also specified. Battery compatibility must nevertheless be confirmed for the selected battery model, firmware, communication interface, and BMS configuration before deployment.
Key Features & Benefits
| Key feature | Technical specification | Customer benefit |
| Online double conversion | Online UPS architecture | Continuous power conditioning for sensitive electronic loads |
| Rated capacity | 3000VA / 3000W | Supports loads within the UPS’s rated capacity |
| Compact 2U chassis | 440 × 420 × 88 mm | Conserves vertical space in equipment racks |
| Rack/tower convertible design | 90° rotatable LCD | Supports different equipment-room layouts |
| Lithium battery compatibility | 48V system; 51.2V nominal LiFePO4 | Supports lithium-based backup configurations |
| Pure sine wave output | Pure sine wave | Suitable for compatible electronic equipment requiring sinusoidal AC |
| High AC-mode efficiency | Greater than 94% | Helps reduce UPS conversion losses under specified operating conditions |
| Communication interfaces | USB and RS485 for BMS | Supports local monitoring and battery communication |
| Optional expansion slot | SNMP or dry-contact cards | Enables additional monitoring and integration options |
| Selectable output voltage | 208/220/230/240VAC | Accommodates supported regional voltage requirements |
Why the Rotatable LCD and Dual-Installation Design Matter
A major advantage of the PER1103+Li is its ability to operate in either rack-mounted or tower installation arrangements.
Many businesses use different installation formats across their facilities. A centralized IT room may have a 19-inch equipment rack, while a branch office, retail site, or small control room may use a floor-standing equipment arrangement.
A conventional rack-oriented design may be inconvenient when the installation changes. A tower-only model, conversely, may consume rack space unnecessarily when integrated into a server cabinet.
The PER1103+Li offers an alternative: one 2U lithium UPS platform that can be configured for either arrangement, with a 90-degree rotatable LCD to maintain a suitable display orientation.
| Installation factor | Rack-mounted configuration | Tower configuration |
| Typical environment | Server racks, network cabinets, IT rooms | Offices, equipment rooms, compact control spaces |
| Space utilization | Uses 2U of rack height | Uses suitable floor or shelf space |
| LCD orientation | Adjusted for rack installation | Rotated 90° for vertical installation |
| Equipment layout | Integrated with rack-based equipment | Suitable for non-rack equipment layouts |
| Procurement implication | One UPS model can serve rack-based projects | The same model can serve compatible tower-based projects |
Installation note: Rack rails, rack ears, tower stands, and other mounting accessories should be confirmed with Prostar for the specific package. The chassis dimensions alone do not establish compatibility with every rack or mounting kit.
Technical Specifications
General and Input Specifications
| Parameter | Specification |
| Model | PER1103+Li |
| Rated capacity | 3000VA / 3000W |
| Form factor | 2U rack mount / tower convertible |
| Dimensions (W × D × H) | 440 × 420 × 88 mm |
| Net weight | 8.2 kg |
| Input phase | Single-phase, L+N+PE |
| Input power factor | ≥0.99 at nominal input voltage |
| Total harmonic distortion (THDi) | Less than 6% |
| Frequency range | 44–56Hz at 50Hz; 54–66Hz at 60Hz |
| High line transfer | 300VAC ±5% |
| High line recovery | 290VAC ±5% |
| Low line transfer | Load-dependent; 110–176VAC according to specified load conditions |
Output and Performance Specifications
| Parameter | Specification |
| Selectable output voltage | 208/220/230/240VAC |
| Output waveform | Pure sine wave |
| Battery-mode voltage regulation | ± 1% |
| Battery-mode frequency accuracy | 50Hz or 60Hz ±0.1% |
| Crest factor | 3:1 |
| Total harmonic distortion(THDv) | <3% THD (Linear Load), <6% THD (Non-linear Load) |
| AC-to-battery transfer time | 0ms |
| Battery-to-AC transfer time | 0ms |
| Inverter-to-bypass transfer time | 4ms |
| AC-mode efficiency | Greater than 94% |
| Battery-mode efficiency | Greater than 90% |
| Noise level | Less than 50dBA at 1m |
Battery, Communication and Environmental Specifications
| Parameter | Specification |
| Supported battery types | LiFePO4 lithium / lead-acid |
| Nominal battery voltage | 48VDC; 51.2VDC nominal for LiFePO4 |
| Charging current | 5A default; configurable from 1A to 30A |
| Charging voltage | 56.4VDC, as specified |
| Charging algorithm | 2-stage CC/floating or 3-stage CC/CV/floating |
| Battery management | Smart battery management and specified BMS protection functions |
| BMS communication | RS485 |
| Supported lithium battery protocols | Native Pylontech RS485 and CANbus protocol support |
| Standard communication interfaces | USB/RS232, RS485 for BMS |
| Optional expansion cards | SNMP / dry-contact cards |
| Operating temperature | 0°C to 40°C |
| Operating humidity | 20%–95%, non-condensing |
| Storage temperature | −15°C to 60°C, excluding battery |
| Operating altitude | 1,000m; derating applies at higher altitudes up to 4,000m |
Practical Applications
A 3000VA 48V lithium ion UPS is not defined by capacity alone. Its suitability depends on the connected equipment, peak demand, power quality requirements, battery configuration, and expected backup duration.
The PER1103+Li combines a 3kW active power rating with online double conversion, selectable output voltage, and rack/tower installation flexibility. These characteristics make it relevant to several application categories.
Application Scenarios
Server Rooms and IT Infrastructure
Supports compatible servers, network switches, storage devices, and related IT equipment. Online power conditioning is relevant where power interruptions or input fluctuations could affect service availability.
Telecommunications and Networking
Provides conditioned backup power for compatible communication equipment. USB, RS232, RS485, and optional SNMP or dry-contact expansion support different monitoring and integration requirements.
Industrial Control Systems
Can protect suitable control electronics, automation computers, and monitoring devices, provided the equipment’s load profile and environmental requirements are within specification.
Branch Offices and Small Equipment Rooms
The rack mount and tower convertible design helps integrators standardize on one UPS model across different installation layouts.
How to Size the UPS for a Real Application
The PER1103+Li 2U lithium UPS is rated at 3000VA/3000W. This does not mean every combination of equipment totaling 3kW will be suitable under all conditions.
Before specifying the UPS, an installer should:
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Calculate the connected equipment’s continuous active power demand in watts.
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Account for startup currents, transient loads, and the crest-factor requirements of connected equipment.
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Maintain sufficient capacity margin for load changes and future expansion.
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Confirm that the equipment accepts the selected output voltage and frequency.
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Calculate the required backup time and verify battery capacity, discharge current, and BMS limits.
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Confirm communication compatibility if remote battery monitoring or automated shutdown is required.
For example, a nominal 2,000W load represents approximately 66.7% of the UPS’s 3,000W rated active power capacity. This is a capacity calculation, not a runtime estimate. Actual backup time depends on the connected battery capacity, discharge characteristics, UPS losses, and operating conditions.
90° Rotatable LCD
The rotatable display improves installation flexibility and user experience.
When a UPS rotates from rack orientation to tower orientation, a fixed display may appear sideways.
The PER1103+Li solves this with a 90‑degree rotatable LCD interface.
The display remains visually aligned with the physical orientation of the UPS.
This provides several practical benefits:
- Easier status checking
- Better readability
- Cleaner installation appearance
- More flexible deployment
- Easier commissioning
- Improved service accessibility
For system integrators, this also reduces the need to stock separate rack and tower versions for certain applications.
Lithium UPS Detail
| 1. External Battery Connector | 2. Emergency Power Off(Option) | 3. RS485 Port for BMS |
| 4. USB Port | 5. AC Output Sockets | 6. Grounding |
| 7. Intelligent Slot(for SNMP Card or AS400 Dry Contact) | 8. Input Circuit Breaker | 9. AC Input Terminal |
Lithium Battery Management, Charging and System Compatibility
LiFePO4 Lithium battery integration involves more than connecting a battery with the correct nominal voltage. A properly engineered system must consider charging parameters, discharge-current requirements, communication protocols, battery protection, and operating temperature.
The PER1103+Li specifies a 48V nominal battery system and 51.2V nominal voltage for LiFePO4 batteries. It also supports configurable charging current between 1A and 30A.
The specified charging voltage is 56.4VDC. The actual charging settings must be checked against the selected battery manufacturer’s requirements before commissioning.
The built-in battery management features include protection against overcharge, over-discharge, overcurrent, short circuit, and temperature excursions. Native support for Pylontech RS485 and CANbus protocols can simplify integration with compatible batteries, but protocol support alone does not guarantee compatibility with every battery model.
Battery Selection Checklist
| Selection factor | What the installer should verify |
| Nominal voltage | Compatibility with the 48V UPS battery system |
| Battery chemistry | Approved LiFePO4 or lead-acid configuration |
| Charging voltage | Compatibility with the battery manufacturer’s specified charging profile |
| Continuous discharge current | Sufficient current capability for the actual load and DC bus voltage |
| BMS communication | Correct protocol, wiring, pinout, and configuration |
| Battery capacity | Sufficient usable energy for the required runtime |
| Temperature limits | Compliance with UPS and battery operating specifications |
| Protection coordination | Compatibility between UPS protections and battery BMS limits |
For lithium battery projects, confirm the approved battery models and operating parameters with Prostar before finalizing the system design.
Communication and Remote Monitoring Options
Power protection is only one part of UPS system management. In multi-site IT environments, integrators may also need to monitor operating status, identify battery issues, and coordinate the UPS with network management or building control systems.
The PER1103+Li includes USB and RS485 for BMS communication. Its expansion slot supports optional SNMP or dry-contact cards.
| Interface or option | Typical purpose | Implementation consideration |
| USB, RS232 | Local UPS connection to a compatible computer | Confirm supported monitoring software and operating-system compatibility |
| RS485 for BMS | Communication with a compatible lithium battery management system | Confirm protocol, wiring and battery compatibility |
| Optional SNMP card | Network-based UPS monitoring | Confirm card model, software features and supported protocols |
| Optional dry-contact card | Status signaling to external systems | Confirm available signals and interface requirements |
For distributors and system integrators, these options allow the UPS configuration to be matched to different customer monitoring requirements. Optional cards should be specified separately where they are not included in the standard configuration.
Frequently Asked Questions (FAQ)
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