50Hz SDEC 4Z3.0-G11 25kVA/20kW Diesel Generator Set

50Hz SDEC  25kVA/20kW Diesel Generator Set

1.Technical Parameter

2. Product Features of SDEC 4Z3.0-G11 25kVA Diesel Generator Set

The SDEC 4Z3.0-G11 20kW/25kVA 50Hz diesel generator set is an upgraded medium-small power industrial power equipment launched by Shanghai Diesel Engine. Adopting the mature Z-series engine technology independently developed by SDEC, this industrial diesel generator set features sufficient power reserve, stable operation and strong environmental adaptability. It solves the problems of insufficient power, large fluctuation and high failure rate of ordinary civilian generators, and is a cost-effective mainstream model in the 25kVA standby generator market.

In terms of power performance, the unit is equipped with an original 4Z3.0-G11 3.0L large-displacement four-cylinder water-cooled diesel engine. Compared with small-displacement generator sets of the same power level, the larger displacement brings more adequate power reserve and stronger overload resistance. It can easily cope with instantaneous load surge and long-term high-load continuous operation. The optimized direct injection combustion system effectively improves fuel combustion efficiency. With a full-load fuel consumption of 6.6L/H, it balances power output and operating economy perfectly, avoiding excessive fuel waste during long-time operation.

In terms of power generation stability and safety, the matching brushless self-excited alternator is a core advantage of this unit. It completely abandons the traditional carbon brush friction power generation structure, eliminating common faults such as carbon brush wear, poor contact and spark ignition. With no vulnerable carbon brush parts, the daily maintenance cycle is greatly prolonged, and the later operation cost is significantly reduced. Equipped with H-grade high-temperature resistant insulation materials, the stator and rotor can withstand long-term high-temperature and high-load working conditions without aging or breakdown, ensuring long-term stable power output.

The whole machine adopts IP23 professional protection grade, which can effectively block external dust, debris and splashing rainwater. It can work stably in dusty construction sites, humid semi-outdoor environments and simple uninsulated equipment rooms, with far higher environmental adaptability than ordinary household generator sets. The 1500rpm constant-speed mechanical speed regulation system ensures ultra-stable 50Hz frequency and voltage output, with voltage regulation accuracy controlled within ±1%. The power fluctuation is extremely small during load switching, which will not cause damage to precision electrical equipment due to current and voltage instability.

In terms of practical use, the unit supports dual power switching of 20kW prime power and 22kW standby power. The prime power meets 24-hour uninterrupted off-grid power supply, while the standby power copes with emergency peak power demand. The integrated compact structure design saves installation space, and the lightweight body is convenient for transportation and mobile deployment. The 12V electric starting system realizes one-key quick start, which can quickly respond to sudden power failure emergencies. Supported by SDEC’s complete national after-sales system, spare parts are easy to purchase, and maintenance is simple, making it very suitable for long-term standby and frequent start-stop working conditions.

3. Application Scenarios

Relying on reliable power output, strong overload capacity and wide environmental adaptability, the SDEC 4Z3.0-G11 25kVA diesel generator set is widely used in commercial standby, industrial backup, outdoor engineering off-grid power supply and public facility power guarantee scenarios, covering most medium and small load power demand fields.

Commercial & Property Emergency Power Supply: This 20kW standby diesel generator set is widely used in community property, small and medium office buildings, shopping malls, catering stores and hotel auxiliary power systems. When the municipal power grid is overhauled, cut off or limited during peak power consumption, it can start quickly to supply power for building lighting, monitoring systems, access control equipment, office computers and weak current systems, ensuring the normal operation of daily business and property management, and avoiding economic losses caused by sudden power outages.

Small Industrial & Processing Workshop Backup: It is the preferred emergency power supply for small hardware processing factories, packaging workshops, woodworking workshops and warehouse storage sites. Sufficient power reserve can support the continuous operation of small processing machinery, ventilation equipment and dust removal systems during power failure, preventing production shutdown and equipment jamming damage. The industrial-grade durable engine adapts to long-term standby and intermittent high-load operation, fully matching the daily power backup needs of small and micro industrial sites.

Outdoor Engineering & Field Off-Grid Power Supply: As a portable off-grid diesel generator set, it is widely applicable to temporary construction sites, road and bridge maintenance, municipal engineering construction, field exploration, agricultural base planting and pastoral breeding operations. The compact and movable design facilitates on-site transfer and flexible deployment, and stable continuous power supply can meet the power demand of field lighting, small construction tools and detection equipment, solving the power shortage problem of outdoor non-grid scenarios.

Public Facilities & Remote Area Power Guarantee: The unit can be used as uninterrupted standby power supply for communication micro base stations, rural environmental monitoring stations, township health clinics, fire control auxiliary equipment and security monitoring systems. It ensures the continuous operation of public service facilities that cannot be powered off. In addition, it serves as the main prime power supply for remote mountainous areas, rural power-deficient areas and temporary field stations, providing stable and reliable daily power guarantee for living and office equipment in off-grid areas.

4. Core Purpose

The core positioning of the SDEC 4Z3.0-G11 25kVA diesel generator set is to provide high-stability, high-reliability power solutions for medium and small load scenarios. It focuses on two core functions of municipal power grid emergency standby power and off-grid independent prime power supply, and is widely used in civil, commercial, industrial and public service fields.

Firstly, it acts as municipal grid emergency standby power, which is its most mainstream application. In case of municipal power failure, line fault, seasonal peak power rationing and routine power grid maintenance, the unit can start rapidly to take over the power supply task. It effectively avoids production suspension, business interruption, equipment damage and data loss caused by power outage, reduces operational risks for enterprises and properties, and ensures the continuity of daily work and production.

Secondly, it provides long-term stable off-grid prime power supply. For remote areas without municipal power grid coverage, temporary construction sites and field operation bases, the 20kW continuous prime power can fully meet the daily power demand of living lighting, office equipment and small production machinery. Relying on the reliable 3.0L SDEC engine core, it supports long-term uninterrupted operation and frequent start-stop use, being an economical and practical independent power supply solution for off-grid scenarios.

Thirdly, it undertakes grid stabilization and peak shaving auxiliary functions. In areas with unstable grid voltage and fluctuating power quality, the unit can be used as auxiliary power equipment to balance grid voltage fluctuations, stabilize terminal power output, and protect electrical equipment from burnout caused by unstable current and voltage. Its excellent overload resistance can cope with instantaneous power surge in peak power consumption periods, ensuring the safety and stability of the whole power consumption system.

5. Frequently Asked Questions (FAQ)

Q1: What is the practical difference between prime power and standby power of SDEC 4Z3.0-G11 generator set?

The 20kW/25kVA prime power is the long-term rated continuous power of the unit, supporting 24-hour uninterrupted operation and suitable for daily off-grid main power supply and long-term standby working conditions. The 22kW/27.5kVA standby power is short-term peak emergency power, only used for instantaneous overload power supply in sudden power failure situations. It cannot run continuously for a long time, and long-term operation under standby power will increase engine load, accelerate parts wear and shorten the service life of the genset. In daily use, it is recommended to operate within the prime power range to ensure stable and durable equipment operation.

Q2: Why is the brushless self-excited alternator of this genset more practical than traditional brushed models?

Different from traditional brushed alternators that require regular carbon brush inspection and replacement, the brushless self-excited structure of the SDEC 4Z3.0-G11 unit has no contact wearing parts. It fundamentally eliminates common faults such as carbon brush aging, poor contact and spark ignition. Matched with H-grade high-temperature insulation, the alternator has stronger heat resistance and anti-aging ability, with lower failure rate and more stable power output. It is especially suitable for long-term unattended standby operation, greatly reducing daily maintenance workload and later use cost, with higher safety and economy in long-term operation.

Q3: What working environments can the IP23 protection grade adapt to?

The IP23 protection grade enables the unit to resist solid foreign objects larger than 12mm and splashing water within 60 degrees vertically. It can adapt to most conventional working environments, including indoor simple equipment rooms, outdoor temporary open-air placement, dusty construction sites and humid semi-outdoor environments, and operates stably in the temperature range of -20℃ to 45℃. It should be avoided to use the unit in long-term water immersion, heavy rain exposure, strong corrosive gas and severe dust accumulation environments, which can effectively extend the service life of the generator set and reduce failure probability.