IPS Capacity Planning for Small Factories in Bangladesh
IPS Capacity Planning for Small Factories in Bangladesh
Small factories across Bangladesh face a persistent challenge: unreliable grid power. With load shedding still a reality in industrial zones from Gazipur to Chattogram, having a properly sized IPS (Inverter Power Supply) system is not optional — it is essential for maintaining production schedules, protecting equipment, and keeping workers safe.
Unlike residential IPS setups, factory capacity planning requires careful analysis of motor loads, starting currents, and continuous vs intermittent power demands. A miscalculated system can trip under load, damage sensitive machinery, or leave you with expensive battery banks that never fully charge. This guide walks through the exact process of sizing an IPS system for small factories in Bangladesh, covering load assessment, battery selection, and practical recommendations for 2026.
Why Small Factories Need Proper IPS Capacity Planning
A typical small factory in Bangladesh — a garment unit, food processing plant, or CNC workshop — runs equipment with very different power characteristics. A sewing machine draws a steady 100W, but a compressor or motor can draw 3-5 times its rated current during startup. If your IPS is sized based only on running wattage, it will trip the moment you switch on the heavy equipment.
According to the Bangladesh Small and Cottage Industries Corporation (BSCIC), there are over 300,000 small factories operating across the country. Most depend on grid electricity supplemented by either diesel generators or IPS systems. A 2025 survey by the Dhaka Chamber of Commerce found that 72% of small industrial units experience at least 2-4 hours of load shedding daily, with some industrial zones in Savar and Narayanganj facing 6-8 hour outages during peak summer months.
Proper capacity planning means your IPS system handles both the startup surge of motors AND the continuous load of all running equipment — without oversizing (which wastes money) or undersizing (which causes breakdowns).
Step 1: Calculate Your Total Factory Load
Every piece of equipment in your factory falls into one of two categories:
Resistive Loads (Steady Draw)
- Lights and LED panels
- Electric heaters, ovens, soldering equipment
- Computers, monitors, and office equipment
- Small hand tools (grinders under 500W)
These are straightforward — their running wattage equals their peak wattage. Add them up directly.
Motor/Inductive Loads (High Startup Current)
- Compressors (refrigeration, air compressors)
- CNC machine spindles
- Pumps and water motors
- Sewing machine clusters
- Conveyor motors
Motor loads require a multiplier. During startup, an induction motor draws 3 to 7 times its rated current for 1-3 seconds. Your IPS must handle this surge without tripping.
Load Calculation Table
| Equipment | Quantity | Watts Each | Type | Total Watts |
|---|---|---|---|---|
| LED Lights | 20 | 25W | Resistive | 500W |
| Sewing Machines | 15 | 120W | Motor | 1,800W |
| Air Compressor | 1 | 2,200W | Motor | 2,200W |
| Water Pump | 1 | 750W | Motor | 750W |
| Computers/Office | 5 | 200W | Resistive | 1,000W |
| CNC Machine | 1 | 3,000W | Motor | 3,000W |
Resistive total: 1,500W
Motor total: 7,750W
Combined running load: 9,250W
With motor startup surge (1.5x motor average): 9,250 + (7,750 × 0.5) = 13,125W peak
You do not need to multiply every motor by 7x simultaneously — motors do not all start at the same instant. A practical safety factor of 1.5x for motor loads during startup covers realistic peak scenarios.
Step 2: Size Your IPS Inverter Correctly
Once you know your peak load, size the inverter. A common mistake is buying an IPS rated exactly at your running load. You need headroom.
What is the recommended IPS capacity for a small factory with 9,000W running load?
For a small factory with approximately 9,000W running load, you should select an IPS inverter rated at 12,000W to 15,000W (12kVA to 15kVA). This provides 30-60% headroom above your running load to handle motor startup surges and equipment you may add in the future. A 10kW inverter will trip under peak load, while a 20kW unit wastes capital on capacity you may never need.
IPS Sizing Guidelines for Factories
| Factory Type | Typical Load | Recommended IPS | Est. Cost (BDT) |
|---|---|---|---|
| Tailoring / Garment (10-15 machines) | 3,000-5,000W | 6-8 kVA | 65,000-95,000 |
| Small Food Processing | 5,000-8,000W | 10-12 kVA | 110,000-150,000 |
| CNC / Metal Workshop | 8,000-15,000W | 15-20 kVA | 160,000-250,000 |
| Plastic Injection Molding | 10,000-20,000W | 20-30 kVA | 250,000-400,000 |
| Electronics Assembly | 3,000-6,000W | 8-10 kVA | 85,000-120,000 |
Step 3: Battery Bank Sizing — LiFePO4 vs Lead-Acid
The battery bank determines how long your factory runs during a power outage. This is where LiFePO4 (lithium iron phosphate) batteries offer a decisive advantage over traditional tubular or lead-acid batteries for industrial use.
How long will a 10kW IPS with lithium batteries run a small factory?
A 10kW IPS system with a 100Ah 48V LiFePO4 battery bank will run a factory with 5,000W load for approximately 1 hour, or a 3,000W load for about 1.7 hours. To achieve 3-4 hours of backup at 5,000W, you need a 200Ah 48V LiFePO4 bank (approximately 4 units of 51.2V 50Ah batteries). LiFePO4 batteries deliver consistent voltage throughout discharge, unlike tubular batteries that lose 15-20% of effective capacity as voltage drops.
Battery Comparison for Factory Use
| Feature | LiFePO4 | Tubular Lead-Acid | AGM VRLA |
|---|---|---|---|
| Cycle Life | 5,000+ cycles | 1,500 cycles | 800 cycles |
| Usable Depth of Discharge | 90-100% | 50-60% | 50% |
| Maintenance | Zero | Regular topping up | None |
| Weight (per kWh) | 6-7 kg | 25-30 kg | 20-25 kg |
| Warranty | 5-7 years | 2-3 years | 1-2 years |
| 5-Year Cost per kWh | BDT 8,500 | BDT 12,000 | BDT 14,500 |
| Heat Tolerance (BD climate) | Excellent | Poor (water evaporation) | Moderate |
For a small factory in Bangladesh where temperatures regularly exceed 35°C, LiFePO4 batteries are the clear choice. Tubular batteries lose up to 30% of their life in extreme heat due to water evaporation and sulfation. LiFePO4 chemistry is thermally stable up to 60°C — critical for factories in tin-roofed buildings where battery rooms can reach 45°C in summer.
Battery Formula
Use this formula to calculate the battery bank size:
Battery Capacity (Ah) = (Load in Watts × Backup Hours) ÷ (Battery Voltage × 0.9)
The 0.9 factor accounts for inverter efficiency (typically 85-92%). For LiFePO4 batteries, you can discharge to 90% depth of discharge safely.
Example: 5,000W load × 4 hours backup ÷ 48V × 0.9 = 463 Ah
This means you need approximately 463Ah at 48V, which translates to 4 units of 51.2V 120Ah LiFePO4 batteries (commonly available in Bangladesh).
Step 4: Consider Load Prioritization
Not every piece of equipment needs to run during a power outage. Smart factory owners create a load priority system:
Priority 1 — Critical (Must Run)
- Safety lighting and exit signs
- Security systems and cameras
- Servers or data equipment
- Refrigeration for perishable materials
- CNC machine controller (to avoid job corruption)
Priority 2 — Important (Run if Capacity Allows)
- Production line equipment
- Compressors and pumps
- Office equipment
Priority 3 — Deferrable (Skip During Outage)
- Non-essential lighting
- HVAC (fans, AC units)
- Charging stations for tools
- Water heaters
Should a small factory in Bangladesh invest in solar IPS for daily backup?
A solar IPS system is an excellent investment for small factories in Bangladesh if your facility has adequate roof space (minimum 200-300 sq ft for a 3kW system) and you experience 4+ hours of load shedding daily. Solar panels charge batteries during daylight, reducing grid dependence and cutting electricity bills by BDT 8,000-15,000 monthly for a typical small factory. The payback period in Bangladesh is typically 3-4 years, after which you enjoy essentially free daytime power. However, solar alone cannot replace grid power for factories running heavy machinery — it works best as a supplement to a properly sized IPS system.
Step 5: Choose the Right IPS Brand for Factory Use
For factory applications in Bangladesh, durability and after-sales service matter more than the lowest price. Here is how the major brands compare for industrial use:
| Brand | Best For | Max Capacity | Warranty | Service Network |
|---|---|---|---|---|
| HiTHIUM | LiFePO4 IPS systems | 30 kVA | 5-7 years | Nationwide BD |
| Luminous | Traditional IPS | 15 kVA | 2 years | Major cities |
| APC (Schneider) | Server/IT loads | 20 kVA | 3 years | Dhaka, Chittagong |
| Hyundai | Budget industrial | 10 kVA | 2 years | Limited |
| Hamko | Mid-range IPS | 12 kVA | 3 years | Major cities |
Common Mistakes in Factory IPS Planning
Based on consultations with factory owners across Dhaka, Gazipur, and Narayanganj, these are the most frequent capacity planning errors:
| Mistake | Consequence | Solution |
|---|---|---|
| Sizing based on nameplate wattage only | IPS trips when motors start | Add 50% surge capacity for motor loads |
| Using tubular batteries in hot rooms | Battery death in 18-24 months | Switch to LiFePO4 with better heat tolerance |
| No load prioritization | Critical equipment loses power | Install load prioritization panel |
| Ignoring power factor | Underperforming system | Use kVA rating, not just kW |
| No growth planning | System overloaded within 2 years | Size 20-30% above current needs |
| Skipping professional installation | Safety hazards, warranty voided | Use authorized dealer installation |
How Much Does Industrial IPS Cost in Bangladesh 2026?
Total system cost depends on three components: inverter, batteries, and installation. Here is a realistic budget breakdown for different factory sizes:
| System Size | Inverter Cost | LiFePO4 Battery Bank | Installation | Total (BDT) |
|---|---|---|---|---|
| 6 kVA + 4hr backup | 45,000 | 80,000 | 8,000 | 133,000 |
| 10 kVA + 4hr backup | 75,000 | 145,000 | 12,000 | 232,000 |
| 15 kVA + 4hr backup | 110,000 | 220,000 | 15,000 | 345,000 |
| 20 kVA + 4hr backup | 155,000 | 310,000 | 20,000 | 485,000 |
| 30 kVA + 4hr backup | 220,000 | 450,000 | 25,000 | 695,000 |
Cost per year comparison: A 10kVA LiFePO4 system costs approximately BDT 46,400 per year over a 5-year lifespan. A comparable tubular battery system costs BDT 38,000 upfront but requires replacement every 2-3 years, pushing the 5-year cost to BDT 85,000+. LiFePO4 saves BDT 38,600+ over 5 years for a typical small factory setup.
Maintenance Requirements for Factory IPS
Even with a properly planned system, regular maintenance ensures peak performance. Here is a practical maintenance schedule:
- Monthly: Check battery voltage levels, inspect terminals for corrosion, clean dust from ventilation fans
- Quarterly: Test full-load backup time, inspect wiring connections, check circuit breaker operation
- Semi-annually: Professional inspection of inverter components, thermal imaging of connections, firmware updates
- Annually: Complete system audit, battery health test (internal resistance measurement), replace air filters
How often should factory IPS batteries be replaced in Bangladesh?
LiFePO4 batteries in a factory IPS system should last 7-10 years with proper maintenance in Bangladesh — approximately 5,000 charge cycles. Tubular lead-acid batteries typically need replacement every 2-3 years (1,000-1,500 cycles) in Bangladesh due to high ambient temperatures and frequent deep discharge cycles. AGM batteries last 1.5-2 years under factory load conditions. The higher upfront cost of LiFePO4 is offset by 3-4x longer lifespan and zero maintenance requirements.
Frequently Asked Questions
Can I use a regular home IPS for my small factory?
A standard home IPS (typically 1-3 kVA) is not suitable for factory use. Factory equipment, especially motors and compressors, requires industrial-grade inverters with higher surge capacity (typically 3-5x rated power for motor startup). Home IPS units also lack features like load prioritization, overload protection for inductive loads, and the battery management systems needed for deep-cycle industrial use. Use a factory-rated IPS with appropriate capacity for reliable industrial backup power.
What is the difference between kW and kVA when choosing an IPS for a factory?
kW (kilowatt) measures real power — the actual work your equipment does. kVA (kilovolt-ampere) measures apparent power — the total power drawn including reactive power from motors and inductive loads. For factory IPS sizing, always use the kVA rating because factory loads (motors, compressors, fluorescent lighting) have a power factor below 1.0, typically 0.7-0.85. An IPS rated at 10kVA with 0.8 power factor delivers 8kW of real power. If your factory motor load totals 7kW, you need at minimum a 9-10kVA IPS to handle it safely.
Should I install IPS batteries in the factory production area?
Never install IPS batteries in the production area. Batteries should be in a separate, ventilated battery room or enclosed cabinet with temperature control. In Bangladesh, factory floors can reach 40-45°C in summer, which accelerates battery degradation. LiFePO4 batteries tolerate heat better than lead-acid but still perform best at 20-30°C. The battery room should have: cross-ventilation or exhaust fans, fire-resistant walls, proper drainage for any spills, easy access for maintenance, and clear signage for safety compliance.
How do I calculate the ROI of upgrading from generator to IPS?
To calculate ROI, compare the annual operating costs. A diesel generator for a 10kW load costs approximately BDT 80-100 per liter, consuming 3-4 liters per hour. Running 4 hours daily costs BDT 960-1,600 per day or BDT 29,000-48,000 per month. A 10kVA LiFePO4 IPS costs approximately BDT 4,600 per month in electricity for charging (at BDT 12/kWh). Monthly savings: BDT 24,000-43,000. Against a total system cost of BDT 232,000, the payback period is 5-10 months — making IPS significantly more economical than diesel generators for daily backup power in Bangladesh.
Can I expand my factory IPS system later if I add more machines?
Yes, but plan for expansion from the start. Choose an IPS inverter with modular battery expansion capability — most modern LiFePO4 IPS systems allow you to add battery modules in parallel. Start with 20-30% more inverter capacity than your current needs. For battery expansion, ensure your inverter’s charge controller can handle the additional capacity. Document your system specifications: battery voltage (48V is standard for factory IPS), communication protocol (CAN bus or RS485), and brand compatibility. Adding batteries later is straightforward if you have the same brand and voltage; mixing brands or chemistries creates dangerous imbalances.
Planning your factory IPS system correctly the first time saves money, prevents production disruptions, and protects your equipment. For a personalized capacity assessment based on your specific factory equipment and layout, contact HiTHIUM Bangladesh for a free consultation.
Ready to power your factory reliably? Explore HiTHIUM’s industrial IPS solutions or read our complete guide on choosing the best lithium IPS in Bangladesh and how to calculate IPS backup time for your specific setup.
