Sida Power
Sida Power 4BW
BW21E/BW25E
Sida Power 4BW is a 4-cylinder naturally aspirated diesel generator-drive engine for BW21E/BW25E generator-set pairings. The supplied Sida generator-set workbook lists 21 kW prime / 23 kW standby at 1500 rpm and 25 kW prime / 28 kW standby at 1800 rpm, with 2.55 L displacement, 19:1 compression ratio, and 250 kg net weight.
Overhaul & repair parts- Manufacturer files
- 2 datasheets
- Last updated
- 2026-09-05
- Package route
- diesel generator sets
- Standby Power · 50 Hz
- 23 kVA
- Electrical Output
- 18 kWe
- Cylinders
- L4
- Displacement
- 2.55 L
- Rated Speed
- 1,500 / 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
50 Hz1500 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 21 | 16 | 20 |
| Standby Power | 23 | 18 | 22.5 |
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 25 | 20 | 25 |
| Standby Power | 28 | 24 | 30 |
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Sida Power 4BW generator set context
The Sida Power 4BW is listed here as a diesel generator-drive engine for 50 Hz and 60 Hz generator sets, with a headline 23 kVA / 18 kWe / standby rating. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
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Technical Specifications
| Brand | Sida Power |
| Model | 4BW |
| Series | BW21E/BW25E |
| Configuration | L4 naturally aspirated direct-injection diesel |
| Cylinders | 4 |
| Displacement | 2.55 L |
| Compression Ratio | 19:1 |
| Dry Weight | 250 kg |
| Dimensions (L×W×H) | 743 × 562 × 664 mm |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | Application-dependent |
| Certifications | IATF16949, GB/T 2820, GB/T 1147.1 |
| Country of Origin | China |
Frequently asked questions
What is the power output of the Sida Power 4BW?
The Sida Power 4BW is rated at 23 kVA standby / 20 kVA prime at 50 Hz (1,500 rpm); and 30 kVA standby / 25 kVA prime at 60 Hz (1,800 rpm).
Does the 4BW run at 50 Hz or 60 Hz?
The Sida Power 4BW is available for both 50 Hz (1,500 rpm) and 60 Hz (1,800 rpm).
What fuel does the Sida Power 4BW use?
The Sida Power 4BW is a diesel generator-set engine.
What is the displacement and cylinder configuration of the 4BW?
The Sida Power 4BW is an inline-4 (4-cylinder) engine with a displacement of 2.55 L.
What emissions information is listed for the 4BW?
This record lists Application-dependent for the Sida Power 4BW. Confirm the exact engine family, model year, configuration and applicable manufacturer certification documents before specifying it for a regulated project. A database label does not establish certification of a complete generator package.
What is the catalog status of the Sida Power 4BW?
The Sida Power 4BW is marked active in this database. Confirm current production and availability with the manufacturer; catalog status is not a live supply check.
Are reference documents available for the 4BW?
This page links reference documents for the Sida Power 4BW. Check each document's title, model coverage, revision and rating conditions before using it for selection.