Generating sets

Wärtsilä generating sets - Tailored to optimize performance

A wide range of generating sets, comprising generator and engine mounted on a common baseframe, are available for both service power generation and for diesel-electric propulsion.

Most Wärtsilä generating sets are designed for operating on standard marine fuel oils. Dual-fuel gensets are flexible when it comes to both gaseous and liquid fuels. The generating sets are resiliently mounted and the generator voltage can be selected. Larger diesel generators are delivered for separate mounting of the diesel engine and generator.

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With the tightening emissions regulations, it makes sense to focus on future-proof choices: Wärtsilä’s efficient, fuel flexible gensets. They will provide power reliably and save you fuel.

Alternative fuel gensets

The Wärtsilä 25 Ammonia genset is a compact, reliable power source capable of running on ammonia, liquid biofuels and traditional marine fuels. (See W25A in the table.)
The Wärtsilä 32 Methanol genset is a powerhouse of a genset with state-of-the-art features. It runs on a wide range of liquid fuels, from heavy fuel oil (HFO) to methanol.

All gensets

W20DF
W25DF
W31DF
W34DF
W14
W20
W25
W26
W31
W32
W25A

W20DF

Wärtsilä 20DF generating set		IMO Tier III
Cylinder bore	200 mm	Generator voltage	0.4 - 13.8 kV
Piston stroke	280 mm	Generator efficiency	0.95 - 0.96
Cylinder output	160, 185 kW/cyl	Fuel specification:	Fuel oil
Speed	1000, 1200 rpm	700 cSt/50°C
Mean effective pressure	22.0, 21.0 bar	ISO 8217, category ISO-F-DMX, DMA & DMB
Piston speed	9.3, 11.2 m/s	BSEC 8390 kJ/kWh at ISO cond. BSGC 8220 kJ/kWh at ISO cond.

20DF, Rated power
	60 Hz		50 Hz
Engine type	195 kW/cyl, 1200 rpm		160 kW/cyl, 1000 rpm
Engine type	Eng. kW	Gen. kW	Eng. kW	Gen. kW
6L20DF	1170	1123	960	920
8L20DF	1560	1498	1280	1230
9L20DF	1755	1685	1440	1380

Dimensions (mm) and weights (tonnes)
Engine type	A*	E*	I*	K	L*	Weight*
6L20DF	5325	2070	895	1800	2731	16.7
			975
			1025
8L20DF	6030	2070	1025	1800	2791	20.8
8L20DF	6030	2070	1075	1800	2791	20.8
9L20DF	6535	2300	1075	1800	2831	23.7
9L20DF	6535	2300	1125	1800	2831	23.7
* Dependent on generator type and size.
* Dependent on generator type and size.

Definitions and notes »

W25DF

Wärtsilä 25DF generating set

		IMO Tier III
Cylinder bore	250 mm	Generator voltage	0.4 - 13.8 kV
Piston stroke	340 mm	Generator efficiency	0.95-0.96
Cylinder output	315 / 345 kW/cyl	Fuel specification	Fuel oil
Speed	900 / 1000 rpm		6 cSt/40˚C
Mean effective pressure	25 bar		ISO 8217, category ISO-F-DMX, DMA, DFA, DMZ, DFZ. Biodiesel (FAME, HVO)
Piston speed	10.2 / 11.3 m/s		BSEC 7560 kj/kWh at ISO conditions

Wärtsilä 25DF, rated power
	60Hz		50Hz
	315 kW/cyl, 900 rpm		345 kW/cyl, 1000 rpm
Engine type	Eng. kW	Gen. kW (0,96)	Eng. kW	Gen. kW (0,96)
6L25DF	1890	1814	2070	1987
7L25DF	2205	2117	2415	2318
8L25DF	2520	2419	2760	2650
9L25DF	2835	2722	3105	2981

Wärtsilä 25DF, dimensions (mm) and weights (tonnes)


Engine type	A*	E*	I*	K*	L*	Weight
6L25DF	7960	2720	1360	2750	3850	40
7L25DF	8620	2720	1360	2750	3850	45
8L25DF	9130	2720	1360	2750	3850	49
9L25DF	9900	2720	1360	2750	3960	55

W31DF

Wärtsilä 31DF generating set
Cylinder bore	310 mm	Fuel specification: Natural gas
Piston stroke	430 mm	700 cSt/50°C
Cylinder output	580, 600 kW/cyl	ISO 8217 category ISO-F-RMK 700 ISO-FDMA, ISO-F-DMB, ISO-F-DMZ, ULSF
Speed	720, 750 rpm
Mean effective pressure	29.8, 29.6 bar	SFOC (g/kWh) at ISO conditions 176.5 (diesel mode)
Piston speed	10.3, 10.75 m/s	BSEC (kJ/kWh) at ISO conditions 7350 (gas mode)
Generator voltage	0.4-13,8 kV
Generator efficiency	0.95-0.97

31DF, Rated power
Engine type	60 Hz		50 Hz
	580 kW/cyl, 720 rpm		600 kW/cyl, 750 rpm
	Eng. kW	Gen. kW	Eng. kW	Gen. kW
8V31DF	4 640	4 450	4 800	4 610
10V31DF	5 800	5 570	6 000	5 760
12V31DF	6 960	6 680	7 200	6 910
14V31DF	8 120	7 790	8 400	8 060
16V31DF	9 280	8 910	9 600	9 220

31 DF genset, dimensions (mm) and weights (tonnes)
Engine type	A*	E*	I*	K*	L*	Weight
8V31DF	9 499	3 594	1 750	2 400	5 001	97.7
10V31DF	10 167	3 594	1 750	2 400	5 001	109.7
12V31DF	11 680	3 594	1 800	2 400	4 944	125.3
14V31DF	12 204	3 594	1 900	2 400	5 044	142.1
16V31DF	12 876	3 594	1 900	2 400	5 044	155.2

Definitions and notes »

W34DF

Wärtsilä 34DF generating set		IMO Tier III, EPA T3
Cylinder bore	340 mm	Generator voltage	0.4 - 13.8 kV
Piston stroke	400 mm	Generator efficiency	0.95 - 0.97
Cylinder output	480, 500 kW/cyl	Fuel specification:	Fuel oil
Speed	720, 750 rpm	700 cSt/50°C
Mean effective pressure	22.0, bar	ISO 8217, category ISO-F-DMX, DMA & DMB
Piston speed	9.6, 10.0 m/s	BSEC 7590 kJ/kWh at ISO cond. BSGC 7490 kJ/kWh at ISO cond.

34DF, Rated power
	60 Hz		50 Hz
Engine type	480 kW/cyl, 720 rpm		500 kW/cyl, 750 rpm
Engine type	Eng. kW	Gen. kW	Eng. kW	Gen. kW
6L34DF	2880	2770	3000	2890
8L34DF	3840	3490	4000	3840
9L34DF	4320	4150	4500	4320
12V34DF	5760	5530	6000	5770
16V34DF	7680	7370	8000	7680

34DF power-up version, Rated power
	Generating sets
Cylinder configuration	720 rpm (60Hz)
Cylinder configuration	Engine [kW]	Generator [kW]
6L34DF	3120	2990
7L34DF	3640	3490
8L34DF	4160	3990
9V34DF	4680	4490

Wärtsilä 34DF power-up version is available only for in-line auxiliary engines.

34DF, Dimensions (mm) and weights (tonnes)
Engine type	A*	E*	I*	K	L*	Weight*
6L34DF	8700	2290	1450	2345	4000	57
8L34DF	10410	2690	1630	2345	4180	76
9L34DF	10475	2890	1630	2345	4180	87
12V34DF	10075	3060	1700	2120	4365	96
16V34DF	11175	3060	1850	2120	4515	121
* Dependent on generator type and size. Generator output based on a generator efficiency of 96%.

Definitions and notes »

W14

Available only in select regions.

Wärtsilä 14 generating set		IMO Tier II or III
Cylinder bore	135 mm	Generator voltage	0.4 - 0.69 kV
Piston stroke	157 mm	Generator efficiency	0.95 - 0.96
Speed	1500, 1800rpm	Fuel specification	Light fuel oil, maximum sulphur content 0.5%
		ISO 8217, category ISO-F-DMX, DMA, DMZ
		SFOC 205,0 g/kWh at ISO condition

Genset 14, Rated power, 60 Hz
Engine type	Eng. kW	Gen. kW	Eng. kW	Gen. kW	Eng. kW	Gen. kW
12V14	710	675	790	750	910	865
16V14	945	900	1055	1000	1215	1155

Genset 14, Rated power, 50 Hz
Engine type	Eng. kW	Gen. kW	Eng. kW	Gen. kW
12V14	710	675	790	750
16V14	945	900	1055	1000

Genset 14, Dimensions (mm) and weights (tonnes)
Engine type	Length*	Width*	Height*	Weight*
12V14	3800	1480	1600	5,5
16V14	4600	1540	1600	7,5

*Dependent on generator type and size.

W20

Wärtsilä 20 generating set		IMO Tier II or III
Cylinder bore	200 mm	Generator voltage	0.4 - 13.8 kV
Piston stroke	280 mm	Generator efficiency	0.95 - 0.96
Cylinder output	185, 200 kW/cyl	Fuel specification	Fuel oil
Speed	900, 1000rpm	700 cSt/50°C
Mean effective pressure	27.3, 28.0bar	ISO 8217, category ISO-F-RMK 700
Piston speed	8.4, 9.3m/s	SFOC 190,3 g/kWh at ISO condition

Genset 20, Rated power
	60 Hz				50 Hz
Engine type	185 kW/cyl, 900 rpm		220 kW/cyl, 1200 rpm		200 kW/cyl, 1000 rpm
Engine type	Eng. kW	Gen. kW	Eng. kW	Gen. kW	Eng. kW	Gen. kW
4L20	740	700	-	-	800	760
6L20	1110	1055	1320	1255	1200	1140
8L20	1480	1405	1760	1670	1600	1520
9L20	1665	1580	1980	1880	1800	1710

Genset 20, Dimensions (mm) and weights (tonnes)
Engine type	A*	E*	I*	K	L*	Weight*
4L20	4910	1770 1920	990	1800	2338	14.0
6L20	5325	1770 1920 2070	895 975 1025	1800	2243 2323 2373	16.8
8L20	6030	1920 2070	1025 1075	1800	2474 2524	20.7
9L20	6535	2070 2300	1075 1125	1800	2524 2574	23.8
* Dependent on generator type and size.

Definitions and notes »

W25

Wärtsilä 25 generating set

		IMO Tier III
Cylinder bore	250 mm	Generator voltage	0.4 - 13.8 kV
Piston stroke	340 mm	Generator efficiency	0.95-0.96
Cylinder output	345 / 375 kW/cyl	Fuel specification	Fuel oil
Speed	900 / 1000 rpm		6 cSt/40˚C
Mean effective pressure	28 / 27 bar		ISO 8217, category ISO-F-DMX, DMA, DFA, DMZ, DFZ. Biodiesel (FAME, HVO)
Piston speed	10.2 / 11.3 m/s		SFOC 182,7 g/kWh at ISO conditions

Wärtsilä 25, rated power
	60Hz		50Hz
	345 kW/cyl, 900 rpm		375 kW/cyl, 1000 rpm
Engine type	Eng. kW	Gen. kW (0,96)	Eng. kW	Gen. kW (0,96)
6L25	2070	1987	2250	2160
7L25	2415	2318	2625	2520
8L25	2760	2650	3000	2880
9L25	3105	2981	3375	3240

Wärtsilä 25, dimensions (mm) and weights (tonnes)


Engine type	A*	E*	I*	K*	L*	Weight
6L25	7960	2720	1360	2750	3800	38
7L25	8730	2720	1360	2750	3800	44
8L25	9390	2720	1360	2750	3890	49
9L25	9820	2720	1360	2750	3890	52

W26

Wärtsilä 26 generating set		IMO Tier II or III
Cylinder bore	260 mm	Generator voltage	0.4 - 13.8 kV
Piston stroke	320 mm	Generator efficiency	0.95 - 0.96
Cylinder output	325, 340 kW/cyl	Fuel specification:	Fuel oil
Speed	900, 1000rpm	700 cSt/50°C
Mean effective pressure	23.0, 25.5 bar	ISO 8217, category ISO-F-RMK 700
Piston speed	9.6, 10.7m/s	SFOC 185,8 g/kWh at ISO condition

Genset 26, Rated power
	60 Hz		50 Hz
Engine type	325 kW/cyl, 900 rpm		340 kW/cyl, 1000 rpm
Engine type	Eng. kW	Gen. kW	Eng. kW	Gen. kW
6L26	1 950	1 870	2 040	1 960
8L26	2 600	2 495	2 720	2 610
9L26	2 925	2 810	3 060	2 940
12V26	3 900	3 745	4 080	3 915
16V26	5 200	4 990	5 440	5 220

Genset 26, Dimensions (mm) and weights (tonnes)
Engine type	A*	E*	I*	K	L*	Weight*
6L26	7 500	2 300	1 200	2 430	3 033	35
8L26	8 000	2 300	1 200	2 430	3 068	45
9L26	8 500	2 300	1 300	2 430	3 168	50
12V26	8 400	2 700	1 560	2 765	3 686	60
16V26	9 700	2 700	1 560	2 765	3 716	70

* Dependent on generator type and size.

Definitions and notes »

W31

Wärtsilä Genset 31			IMO Tier III IMO Tier II w/o SCR
Cylinder bore	310 mm	Generator voltage	0.4–13.8 kV
Piston stroke	430 mm	Generator efficiency	0.95–0.97
Cylinder output	630/650 kW/cyl	Fuel specification: Fuel oil
Speed	720, 750 rpm	700 cSt/50⁰C
Mean effective pressure	32.4 / 32.1 bar	ISO 8217 category ISO-F-RMK 700 ISO-FDMA, ISO-F-DMB, ISO-F-DMZ, ULSF
Piston speed	10.3, 10.75 m/s	SFOC 169.4 g/kWh at ISO conditions

Genset 31, Rated power
Engine type	60 Hz		50 Hz
	630 kW/cyl, 720 rpm		650 kW/cyl, 750 rpm
	Eng. kW	Gen. kW	Eng. kW	Gen. kW
8V31	5 040	4 840	5 200	4 990
10V31	6 300	6 050	6 500	6 240
12V31	7 560	7 260	7 800	7 490
14V31	8 820	8 465	9 100	8 735
16V31	10 080	9 675	10 400	9 985

Genset 31, Dimensions (mm) and weights (tonnes)
Engine type	A*	E*	I*	K	L*	Weight*
8V31	9 499	3 594	1 750	2 400	5 001	97.3
10V31	10 167	3 594	1 750	2 400	5 001	109.2
12V31	11 680	3 594	1 800	2 400	4 944	124.7
14V31	12 204	3 594	1 900	2 400	5 044	141.5
16V31	12 876	3 594	1 900	2 400	5 044	154.5

*Dependent on generator type and size.

Definitions and notes »

W32

Wärtsilä 32 generating set		IMO Tier II or III
Cylinder bore	320 mm	Generator voltage	0.4 - 13.8 kV
Piston stroke	400 mm	Generator efficiency	0.95 - 0.97
Cylinder output	560, 580 kW/cyl	Fuel specification:	Fuel oil
Speed	720, 750 rpm	700 cSt/50°C
Mean effective pressure	24.9, 25.9 bar	ISO 8217, category ISO-F-RMK 700
Piston speed	9.6, 10.0 m/s	SFOC 174 g/kWh at ISO condition

Genset 32, Rated power
Engine type	60Hz/720rpm		50 Hz/750 rpm
	560 kW/cyl		580 kW/cyl
	Engine kW	Gen. kW	Engine kW	Gen. kW
6L32	3 360	3 230	3 480	3 340
8L32	4 480	4 300	4 640	4 450
9L32	5 040	4 840	5 220	5 010
12V32	6 720	6 450	6 960	6 680
16V32	8 960	8 600	9 280	8 910

Genset 32, Dimensions (mm) and weights (tonnes)
Engine type	A*	E*	I*	K	L*	Weight*
6L32	8 345	2 490	1 450	2 345	3 745	57
7L32	9 391	2 690	1 630	2 345	3 960	69
8L32	10 410	2 690	1 630	2 345	4 010	76
9L32	10 505	2 890	1 630	2 345	4 010	86
12V32	10 700	3 060	1 700	2 120	4 130	100
16V32	11 465	3 360	1 850	2 120	4 445	127
* Dependent on generator type and size.

Definitions and notes »

W25A

Wärtsilä 25 Ammonia generating set

		IMO Tier III
Cylinder bore	250 mm	Generator voltage	0.4-13.8 kV
Piston stroke	340 mm	Generator efficiency	0.95-0.96
Cylinder output	280 / 305 kW/cyl	Fuel specification	Fuel oil, Ammonia
Speed	900 / 1000 rpm		6 cSt/40˚C
Mean effective pressure	22 bar		ISO 8217, category ISO-F-DMX, DMA, DFA, DMZ, DFZ. Biodiesel (FAME, HVO)
Piston speed	10.2 / 11.3 m/s

Wärtsilä 25 Ammonia, rated power
	60Hz		50Hz
	280 kW/cyl, 900 rpm		305 kW/cyl, 1000 rpm
Engine type	Eng. kW	Gen. kW (0,96)	Eng. kW	Gen. kW (0,96)
6L25DF	1680	1613	1830	1757
7L25DF	1960	1882	2135	2050
8L25DF	2240	2150	2440	2342
9L25DF	2520	2419	2745	2635

Wärtsilä 25 Ammonia, dimensions (mm) and weights (tonnes)


Engine type	A*	E*	I*	K*	L*	Weight
6L25	7960	2720	1360	2750	3800	39
7L25	8620	2720	1360	2750	3800	44
8L25	9180	2720	1360	2750	3890	48
9L25	9600	2720	1360	2750	3890	51

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