VIHOPHA – Viet Hoa Phat Corp

FREQUENTLY ASKED QUESTIONS

Power generators serve as a backup power source, helping to ensure continuous operations during grid failures, overloads, or unexpected power outages. In residential, commercial, and industrial projects, power interruptions can cause significant economic losses, safety risks, and operational issues. Power generators help to:
  • Maintain production and business activities without interruption
  • Protect critical machinery and equipment
  • Ensure safety for hospitals, data centers, factories, and industrial parks
Therefore, equipping a power generator is an essential and long-term solution for every modern project.
To choose the right power generator, it is necessary to accurately determine the **total load capacity** and the specific usage characteristics of the project. Key factors to consider include:
  • Total power consumption of devices (kW / kVA)
  • Equipment with high starting currents (motors, compressors, elevators…)
  • Voltage requirements: 1-phase or 3-phase
  • Operating time: short-term standby or continuous run
VIHOPHA always recommends that customers conduct an on-site survey and seek technical consultation before selection to ensure stable, durable operation and cost optimization.
Generator capacity is typically expressed in kVA or kW. The basic calculation is: kW = kVA × cosφ In this formula, cosφ represents the power factor of the load, which is usually 0.8 for industrial generators. When selecting a generator, you should:
  • Calculate the total power consumption of all devices in use.
  • Add a safety/reserve margin (typically 10–25%).
  • Consider the starting currents of motor-based equipment.
Calculating the correct capacity ensures stable operation, prevents overloading, and extends the equipment’s lifespan.
Power Factor (cosφ) is the ratio between real power (kW) and apparent power (kVA). In power generator systems:
  • The standard cosφ is typically 0.8 for 3-phase units.
  • A higher cosφ indicates better electrical energy utilization efficiency.
If cosφ is neglected, users may choose a generator with insufficient real power, leading to overloading or reduced operational efficiency. Therefore, cosφ is a very important parameter when calculating and selecting a power generator.
Generators are classified by power levels to suit specific usage needs:
  • Small Capacity (under 100 kVA): Suitable for large households, offices, small shops, and telecommunication stations.
  • Medium Capacity (100 – 500 kVA): Suitable for workshops, hotels, office buildings, and district-level hospitals.
  • Large Capacity (above 500 kVA): Suitable for industrial zones, large hospitals, data centers, and large-scale factories.
In addition, generators are classified by operational modes:
  • Prime Power: Used when the generator needs to operate frequently or serve as the primary power source.
  • Standby Power: Used as emergency backup during short-term grid outages.
VIHOPHA will conduct an on-site load survey and provide expert consultation to determine the appropriate capacity, ensuring stable operation and optimized investment costs.
**VIHOPHA** provides a full range of single-phase and three-phase generators, meeting a wide variety of usage needs.
  • Single-phase units: suitable for households and small offices
  • Three-phase units: suitable for workshops and industrial projects
The choice between single-phase and three-phase should be based on the existing electrical system and the actual load requirements of the project.
VIHOPHA provides power generators powered by world-leading diesel engine brands, flexibly selected according to the specific usage needs, capacity, and budget of each project. European & American Brands (Premium Standards):
  • Cummins (USA): High durability, wide power range from approximately 28kVA to over 2500kVA, common components, and easy to maintain or replace.
  • Perkins (UK): Smooth and stable operation, meeting emission standards, suitable for hotels, resorts, and buildings.
  • Baudouin (France): A long-standing brand known for its durable performance under heavy-duty load conditions.
  • Volvo Penta (Sweden): Modern technology, fuel-efficient, and environmentally friendly.
Asian Brands (Stable & Reliable):
  • Mitsubishi (Japan): Suitable for projects requiring high reliability, large capacity, and continuous operation.
  • Doosan (South Korea): Powerful engines with reasonable investment and operating costs, widely used in workshops and industrial zones.
Economic Brands (Budget Optimization):
  • Includes brands such as SDEC, Weichai, Shanghai, Yuchai…, suitable for projects needing to optimize initial investment costs while still ensuring stable operation.
All engines are assembled into complete generator sets according to VIHOPHA technical standards, meeting:
  • Vietnam standard voltage: 380–400V / 50Hz.
  • Appropriate power factor for each machine type (commonly cosφ = 0.8 for 3-phase units).
  • High durability, easy maintenance, and readily available spare parts.
VIHOPHA will conduct surveys and provide consultation on the most suitable engine brand based on:
  • Purpose of use (residential, industrial, standby, or continuous operation).
  • Required capacity.
  • Investment budget.
  • Technical standards and bidding documents (if any).
VIHOPHA power generators are fully equipped with standard systems and accessories, including:
  • Smart control panel
  • Cooling and exhaust systems
  • Base frame and anti-vibration rubber mounts
  • Soundproof canopy (if applicable)
Additionally, an ATS panel, synchronization system, and remote monitoring can be integrated based on specific usage requirements.
Yes. Power generators can be connected in parallel through a synchronization system. This solution helps to:
  • Increase capacity flexibly
  • Ensure safety redundancy when one unit undergoes maintenance
  • Optimize operating costs
VIHOPHA has the full capability to design, install, and operate parallel generator systems for large-scale projects.
VIHOPHA provides on-site survey, technical consultation, and turnkey solution proposals for customers. Our team of experienced engineers will:
  • Evaluate electrical power consumption needs
  • Calculate the appropriate capacity
  • Propose optimized and cost-saving solutions
We are committed to accompanying our customers from consultation to installation and long-term maintenance.
Power generators supplied by VIHOPHA – Viet Hoa Phat are warranted and maintained according to the manufacturer’s technical standards and the company’s service commitments. Our warranty policy includes:
  • Engine and alternator warranty according to manufacturer standards
  • Coverage for technical defects caused by the manufacturer
  • Technical support throughout the warranty period
In addition, VIHOPHA provides periodic maintenance services to ensure the generator always operates stably and durably:
  • Overall inspection of the generator system
  • Oil, oil filter, fuel filter, and air filter replacement
  • Inspection of the electrical system, control panel, and ATS
  • Load testing and calibration of operating parameters
With a team of experienced engineers, VIHOPHA is committed to fast response – accurate handling – long-term partnership, giving customers peace of mind throughout the generator’s lifespan.
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