PET1103+Li 3kVA lithium UPS 48V online double conversion for pc
Lithium Battery UPS | 3000VA/3000W | 48VDC | 1-30A Charging | BMS
Prostar PET1103+Li is a 3kVA lithium UPS for professional PC systems, workstations, network devices, edge computing equipment, and small IT infrastructures that require stable and uninterrupted power protection. This 3kVA lithium UPS uses 48V LiFePO4 lithium battery technology and online double conversion topology. It outputs pure sine wave, transfers at 0 ms, achieves 95% efficiency in double-conversion mode and 98% in ECO mode, and supports 6,000+ cycles at 80% DoD versus 300–500 cycles for lead-acid systems. This lithium battery UPS suits users who need long runtime, lower maintenance, and intelligent power management.
Critical Power Challenge in Modern Computing Environments
Modern high-performance PCs, multi-GPU AI development workstations, and rack servers use Switch-Mode Power Supplies (SMPS) with Active Power Factor Correction (PFC). Line-interactive UPS units and lead-acid backups fail in these environments due to three systemic vulnerabilities:
Transfer Time Latencies and Waveform Distortion
Line-interactive UPS units introduce a 4ms to 20ms transfer lag during power dips or blackouts. Active PFC PC power supplies trigger an instantaneous low-voltage shutdown within 4ms–8ms. This causes unrecorded data loss, corruption of machine-learning models, or hardware strain.
Rapid Degradation of Lead-Acid (VRLA) Batteries
Valve-Regulated Lead-Acid (VRLA) batteries have 300 to 500 cycles or 2–3 years of service life. In high-density PC environments with ambient thermal load, VRLA cells undergo thermal runaway and capacity degradation. This requires replacements every 2–3 years.
Voltage Fluctuations, Harmonics, and Grid Noise
Commercial electrical grids produce micro-sags, transient surges, frequency drifts, and total harmonic distortion (THD). Unconditioned power erodes semiconductor components inside GPUs and CPUs over time and reduces system longevity.
PET1103+Li 3kVA Lithium UPS Architecture
The PET1103+Li 3kVA lithium UPS addresses power anomalies through online double-conversion engineering paired with a 48V lithium iron phosphate (LiFePO4) energy storage matrix.
The system converts AC power to DC and back to AC. This decouples connected PCs from grid fluctuations and delivers a continuous pure sine wave output with 0 ms transfer time.
For professional users, a 3kVA lithium UPS with online double conversion provides higher protection by converting incoming AC power into DC and reconstructing a clean AC output continuously.
The PET1103+Li solves these challenges by combining:
- 48V lithium battery technology
- Online double conversion architecture
- High power density design
- Intelligent battery management
- Long service life energy storage
| Feature / Metric | Legacy 3kVA VRLA UPS | PET1103+Li 3kVA Lithium UPS | User Operational Impact |
| Battery Lifespan | 2–3 Years | 10+ Years | 3x to 4x longer operational life; eliminates frequent battery swaps |
| Cycle Life (80% DoD) | 300 – 500 Cycles | 6,000+ Cycles | Resilient against daily cycling and frequent micro-outages |
| Transfer Time | 4ms – 10ms (Line-Interactive) | 0 ms (Online Double Conversion) | Guarantees zero crash/reboot on sensitive Active PFC PC power supplies |
| Weight & Footprint | ~15 kg – 25kg (Heavy) | ~6.8 kg – 18 kg (Ultra-Light) | 60% weight reduction; ideal for rack enclosures and desk setups |
| Recharge Time (to 90%) | 8 – 12 Hours | 1.5 – 2.5 Hours | Rapid recovery between back-to-back grid disruptions |
| Operating Temp Range | 20°C to 25°C (Strict) | 0°C to 40°C (Wide) | High resilience to ambient heat in server rooms or workstation bays |
Unlike UPS systems using VRLA batteries, this lithium UPS system uses LiFePO4 battery technology. It offers 6,000+ cycles at 80% DoD, charges to 90% in 1.5–2.5 hours, operates from 0°C to 40°C, and requires fewer replacements.
The UPS provides 3000VA/3000W capacity, making it suitable for:
- High-performance PCs
- Gaming and professional workstations
- Graphic design computers
- Network servers
- Communication equipment
- CCTV monitoring systems
- Industrial control computers
Product Key Features
True Online Double-Conversion Topology
The PET1103+Li functions as a continuous power filter. It rectifies utility AC power to 48V DC to charge the lithium array. A precision inverter generates an AC sine wave with THD < 2% for linear loads. During grid sags or blackouts, the output waveform remains unchanged.
48V LiFePO4 Lithium Battery System
The integrated 48V lithium battery architecture improves reliability and battery performance.
- Longer backup lifespan
- Better thermal stability
- Higher charging efficiency
- Reduced replacement frequency
This makes it a reliable 48V lithium UPS for PC and network equipment.
Eco Mode & Dynamic Efficiency Tuning
The PET1103+Li achieves 95% efficiency in double-conversion mode and over 98% in ECO mode. It minimizes heat dissipation and active cooling overhead and lowers energy consumption in continuous operating environments.
Intelligent Charging Management for Longer Battery Life
The built-in intelligent charging system supports:
- High-current rapid charging algorithms
- Adjustable charging current
- Adjustable charging mode through LCD panel
- Battery protection management
This helps reduce charging time after power recovery and improves overall battery utilization.
Intelligent Battery Management System (BMS)
An integrated industrial BMS monitors cell-level voltages, currents, state-of-charge (SoC), state-of-health (SoH), and temperatures in real time. The BMS balances cells during charge cycles and prevents overcharge, over-discharge, short circuits, and thermal stress.
Generator Compatible Design
PET1103+Li supports generator input, making it suitable for areas with unstable grids.
Applications include:
- Remote offices
- Industrial sites
- Telecom locations
- Backup power systems
Communication Protocol Compatibility
The UPS inverter and BMS exchange data via RS485. Protocols include Pylontech (RS485 and CANbus). The system reports per‑cell voltage, per‑cell temperature, SoC, and alarm flags every 1 second.
Intelligent LCD Monitoring System
The UPS features an advanced LCD interface providing real-time information:
- Input voltage
- Output voltage
- Battery status
- Load percentage
- Operating mode
- Fault information
Users can easily monitor UPS operation without additional software.
Technical Specifications
General Specifications
| Parameter | Specification |
| Model | PET1103+Li |
| Capacity | 3000VA / 3000W |
| Topology | Online Double Conversion |
| Phase | Single Phase |
| Form Factor | Tower |
| Dimension (D×W×H) | 395×145×222 mm |
| Net Weight | 6.8 kg |
Input and Output Performance
| Parameter | Specification |
| Input Voltage Range | Nominal Voltage ±15% |
| Frequency Range | 50Hz: 44-56Hz / 60Hz:54-66Hz |
| Input Power Factor | ≥0.99 |
| Input THDi | <6% |
| Output Voltage | 208/220/230/240VAC Selectable |
| Voltage Regulation | ±1% (Battery Mode) |
| Output Waveform | Pure Sine Wave |
| Transfer Time | 0ms |
| Battery Frequency Accuracy | 50Hz/60Hz ±0.1% |
| Crest Factor | 3:1 |
Battery and Communication
| Parameter | Specification |
| Battery Type | LiFePO4 Lithium / Lead Acid |
| Nominal Battery Voltage | 48VDC (51.2VDC LiFePO4) |
| Charging Current | 5A Default, Adjustable 1-30A |
| Charging Mode | CC/Floating or CC/CV/Floating |
| Battery Protection | Over-charge, Over-discharge, Over-current, Short Circuit, Temperature Protection |
| Communication Ports | USB / RS232 / RS485 |
| Smart Slot | SNMP / Dry Contact Optional |
| BMS Protocol | Pylontech RS485 & CANbus |
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 |
Application Scenarios
Professional Computing Environment
For companies using expensive computers, CAD workstations, medical computers, and data processing systems, stable power is essential.
PET1103+Li protects:
- CPU and workstation hardware
- Storage devices
- Monitors
- Network switches
- External equipment
Enterprise Server Backup
Provides clean, regulated online power for mission-critical blade servers, switches, and storage systems (NAS/SAN).
Healthcare & Medical IT
Safeguards lab automation systems, electronic health record (EHR) workstations, and imaging equipment against micro-outages.
Security Monitoring Systems
CCTV systems and surveillance servers must operate continuously.
The lithium UPS ensures:
- 24/7 monitoring availability
- Protection against power interruptions
- Stable operation of DVR/NVR systems
Frequently Asked Questions (FAQ)
What makes a 3kVA lithium UPS superior to a traditional lead-acid UPS for PC setups?
How does the zero transfer time (0 ms) benefit sensitive computer hardware?
Is LiFePO4 battery chemistry safe for office and home workstation environments?
What is a 3kVA lithium UPS?
How long can a 3kVA lithium UPS provide backup power?
Can PET1103+Li work with generators?
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| MODEL | PET1103+Li | |
| CAPACITY | 3000VA/3000W | |
| Form Factor | Tower Type | |
| Size, D X W X H (mm) | 395×145×222 | |
| Net Weight (kgs) | 6.8 | |
| INPUT | ||
| Low Line Transfer | 176Vac (Load ≥100%); 176–110Vac (Load 100%–50%); 110Vac (Load ≤50%) | |
| Low Line Recovery | Low transfer voltage + 10 V | |
| High Line Transfer | 300 Vac ±5% | |
| High Line Recovery | 290 Vac ±5% | |
| Frequency Range | 50Hz:44-56Hz or 60Hz: 54-66Hz | |
| Phase | Single Phase, L+N+PE | |
| Power Factor | ≧ 0.99 @ nominal voltage (input voltage) | |
| Harmonic Distortion(THDi) | < 6% | |
| OUTPUT | ||
| Output Voltage | 208/220/230/240VAC (Selectable) | |
| AC Voltage Regulation | ± 1% (Batt. Mode) | |
| Frequency Range(AC Mode) | Synchronized to Mains | |
| Frequency Range (Batt. Mode) | 50Hz or 60Hz ± 0.1% | |
| Current Crest Ratio | 3:1 | |
| Harmonic Distortion(THDv) | <3% THD (Linear Load), <6% THD (Non-linear Load) | |
| Transfer Time | AC to Battery | 0ms |
| Battery to AC | 0ms | |
| Inverter to Bypass | 4ms | |
| Waveform | Pure Sine Wave | |
| Overload Capacity | AC Mode: Battery Mode: 30mins @102%-110% load 1min @102%-110% load 10mins @110%-130% load 10sec @110%-130% load 30sec @130%-150% load 3sec @130%-150% load 200ms @>150% load 200ms @>150% load | |
| EFFICIENCY | ||
| AC Mode | > 95% | |
| Battery Mode | > 90% | |
| BATTERY | ||
| Battery Type | LiFePO4 Lithium / Lead-Acid | |
| Nominal Battery Voltage | 48VDC (51.2VDC for LiFePO4) | |
| Charging Current | 5A(Default),1A-30A | |
| Charging Voltage | 56.4VDC (14.1V * N) | |
| Charging Algorithm | 2-stage (CC/Floating) or 3-stage (CC/CV/Floating) | |
| BMS Protection | Over-charge, Over-discharge, Over-current, Short-circuit, Over-temp, Under-temp | |
| Integrated Functions | Auto Restart, Self-Test Function, Smart Battery Management | |
| ECO | ||
| Input Voltage Range | Nominal Voltage ± 15% | |
| Input Frequency Range | 50Hz / 60Hz ± 4Hz | |
| ENVIRONMENT | ||
| Ambient Temperature | 0°C – 40°C | |
| Operation Humidity | 20%-95% (Non-condensing) | |
| Storage Temperature | -15~60℃ (Excluding battery) | |
| Altitude | 1000 m (derate for higher altitudes up to 4000 m) | |
| Noise Level | Less than 50dBA @ 1 Meter | |
| COMMUNICATION | ||
| Communication Interface | USB, RS232, RS485 | |
| BMS Protocol Support | Native support for Pylontech RS485 and CANbus protocols | |
| Expansion Slot | Smart Slot for optional SNMP / Dry Contact card | |
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