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Home›Generac›Generac QT045

Generac QT045 Generator Set

The Generac QT045 is a 45 kW Natural Gas, Propane standby generator set powered by a Generac In-line engine. It is available at 120/240 V, 120/208 V and 277/480 V, 60 Hz. It holds about 3.8 L (1.0 gal) of oil and 11.4 L (3.0 gal) of coolant, with a maximum ambient rating of 50 °C. Starting uses group-26 battery rated 525 CCA at 12 V. The set produces 73 dBA at 7 m.

45 kW
Standby
2.4 L
Displacement
3.8 L
Oil capacity
2
Document types

How to read your Generac serial & model number →

Specifications

FuelNatural Gas, Propane
Frequency60.0 Hz
Standby power45 kW
EmissionsEPA Compliant
ControllerH-100, Nexus, R100
Oil capacity3.8 L
Voltage options120/240 V, 120/208 V, 277/480 V
Battery group26
Battery cranking525 CCA
Battery voltage12 Volts V
Coolant capacity11.4 L
Max ambient50 °C
Sound level73.0 dBA @ 7 m

Engine

Generac In-line
Oil capacity3.8 L
Coolant capacity9.5 L
Displacement2.4 L
AspirationNaturally Aspirated
Rated speed3600 rpm

Maintenance & consumables

for the Generac In-line
ItemSpecCapacityPart #Interval
Air filter059402500 hr Amazon eBay $23.38 PartsGeek
Fuel filterinspect and test fuel system—1000 hr find
Oil filter0G02070100100 hr Amazon eBay $24.99 PartsGeek
Belt0G0823 Amazon eBay PartsGeek
Coolant3.8—1000 hr
Coolant filtercheck starter, check engine DC alternator—1000 hr find
Oilbreak-in oil and filter100.0—1000 hr

Common questions

What is the power rating of the Generac QT045?

The Generac QT045 is rated 45 kW standby.

What engine does the Generac QT045 use?

The Generac QT045 is powered by the Generac In-line engine.

What fuel does the Generac QT045 use?

The Generac QT045 runs on Natural Gas, Propane.

What is the oil capacity of the Generac QT045?

The Generac In-line engine in the Generac QT045 has an oil capacity of 3.8 liters.

Parts

250
Part #DescriptionQtySystem
006199-0PMM Starter KitStarter Amazon eBay PartsGeek
022097WASHER, SPLIT 1/4”-M66Washer PartsGeek
022155WASHER LOCK #66Washer PartsGeek
022473WASHER FLAT M6-1/4 ZINC8Washer PartsGeek
029032HOSE 9/32 ID (47” LG)1Hose PartsGeek
035472CLAMP HOSE #6 .43-.781Hose PartsGeek
035606SENSOR HI COOLANT SHUTDOWN1Sensor PartsGeek
035685CLAMP HOSE #28 1.32-2.254Hose PartsGeek
040105HOSE COOL 2IN ID 20R4 (3FT)1Hose PartsGeek
042561CLAMP HOSE #36 1.88-2.752Hose PartsGeek
044149GASKET EXHAUST RING1Gasket PartsGeek
045757SCREW HHC M6-1.0 x 25 LONG4Screw PartsGeek
047290HOSE 3/8 ID SINGLE BRAID (18” LG)1Hose PartsGeek
047411SCREW HHC M6-1.0 X 16 G8.84Screw PartsGeek
048031CCLAMP HOSE BAND 1/42Hose PartsGeek
048031JHOSE CLAMP BAND 5/8"4Hose PartsGeek
048031LCLAMP HOSE BAND 1.0"4Hose PartsGeek
048031PCLAMP HOSE BAND .88"1Hose PartsGeek
052624BEARING BALL 6212 SEALED1Bearing PartsGeek
056326VINYL TRIM 1/8” GAP8.4 FT.Trim PartsGeek
057753BHOSE 1.5 ID X 2 LG 20R4 (35KW)1Hose PartsGeek
057822CLAMP HOSE #8 .53-1.002Hose PartsGeek
057823CLAMP HOSE #10 .56-1.064Hose PartsGeek
057824CLAMP HOSE #16 .87-1.50 (3600 RPM)1Hose PartsGeek
058208BATTERY 12V NEGATIVE GROUNDBattery Amazon eBay $50.00 PartsGeek
059057HOSE 3/4 ID SAE-30R2 (7.62”LG”)1Hose PartsGeek
059193CHOSE 5/8 ID X 31.0" LG1Hose PartsGeek
059194HOSE 5/8 ID LPG & NG (12” LG)1Hose PartsGeek
059401CARBURETOR GASKET1Gasket PartsGeek
059402FILTER ELEMENT1Air filter Amazon eBay $23.38 PartsGeek
064945GASKET CARB ADAPTOR1Gasket PartsGeek
066760STRIP SEALANT 1/8 X 1 (44.52”LG)1Seal PartsGeek
069860BHOSE OIL DRAIN ASSY 16"1Hose PartsGeek
069860CHOSE OIL DRAIN ASSY 21"1Hose PartsGeek
069860EHOSE DRAIN ASSY 28"1Hose PartsGeek
071296AHOSE 2"ID X 3.0"LG2Hose PartsGeek
077483BATTERY 12VDC 75-AH 26 (SOLD AS AN OPTION)REFBattery Amazon eBay $44.99 PartsGeek
084750PLUG SPARK4Spark plug Amazon eBay $14.99 PartsGeek
099502CLAMP HOSE #24 B1.06-2.006Hose PartsGeek
0A2110SCREW SWAGE 1/4-20 X 1/2 Z/YC12Screw PartsGeek
0A2496ABRACKET SAE SCROLL TENSIONER2Bracket PartsGeek
0A45310244FILTER 1.5L/2.4L G2 OIL1Oil filter Amazon eBay $24.99 PartsGeek
0A4637Engine Air Filter1Air filter Amazon eBay $49.95 PartsGeek
0A5259AHOSE 2"ID X 3.0"LG2Hose PartsGeek
0A5547COVER AIR CLEANER1Air filter PartsGeek
0A6751SW-TMP 245 DEG 3/8 NPT1Sensor PartsGeek
0A8584OIL FILTER1Sensor PartsGeek FridayParts $31.60
0C2428SCREW PHTT #6-32 X 1/2 ZYC6Screw PartsGeek
0C5133O-RING 29.82 X 2.621Seal PartsGeek
0C7649CLAMP HOSE .38-.873Hose PartsGeek
0C8127ELEMENT, AIR CLEANER1Air filter Amazon eBay $28.00 PartsGeek
0D2244MMAGNETIC PICKUP2Sensor PartsGeek FridayParts $18.08
0D3488HSERPENTINE BELT (60.5")1Belt Amazon eBay $49.99 PartsGeek
0D3488SBELT SERPENTINE 37.0" (1800 RPM)1Belt Amazon eBay PartsGeek
0E0502TEMPERATURE SENDER, DELPHI1Sensor PartsGeek
0E0561ASSY WATER LEVEL SENSOR C/E PL1Sensor PartsGeek
0E0668O-RING 2-028 1.38 X 1.50 X .061Seal PartsGeek
0E0991SEAL SHAFT COVER1Seal PartsGeek
0E0992BPLUG EXPANSION 21/32" O.D. (WATER PUMP)Pump PartsGeek
0E1104GASKET AIR CLEANER ADAPTER1Gasket PartsGeek
0E2507PROBE COOLANT LEVEL 3/8NPTF1Sensor PartsGeek
0E3256V-BELT A58 (60IN O.C.) DDC S601Belt Amazon eBay PartsGeek
0E5968GASKET EXTRUDED TRIM (328” LG)1Gasket PartsGeek
0E6586GASKET, BOSCH 32 & 402Gasket PartsGeek
0E6729STARTER 12V1Starter PartsGeek
0E7121O-RING 47.625 ID X 2.38 WIDTH2Seal PartsGeek
0E7415Oil Filter1Oil filter Amazon eBay $47.95 PartsGeek
0E7702HOLD DOWN AIR CLEANER1Air filter PartsGeek
0E7841GASKET THERMOSTAT ADAPTOR2Gasket PartsGeek
0E9747STARTER, 12 VOLT1Starter PartsGeek
0E9868AD.C. ALTERNATOR W/OUT PULLEY1Alternator PartsGeek
0F2119O-RING 45.63 ID X 2.62 WIDTH1Seal PartsGeek
0F2560PULLEY V-BELT 4" FLANGED1Belt PartsGeek
0F3216PULLEY 80 OD DC ALTERNATOR (1800 RPM)1Alternator PartsGeek
0F3216CPULLEY 132 OD DC ALTERNATOR (3600 RPM)1Alternator PartsGeek
0F3446BRKT R/H SIDE D.C. ALTERNATOR1Alternator PartsGeek
0F3447BRKT L/H SIDE D.C. ALTERNATOR1Alternator PartsGeek
0F3834ASSY SCROLL 390 X 60MM CPL1Assembly PartsGeek
0F3846BSHROUD ALT SHEET METAL CPL 2P2Shroud PartsGeek
0F3892SCREEN, 390 SAE ALT 60MM WIDE2Screen PartsGeek
0F4269GASKET MIXER BODY2Gasket PartsGeek
0F4270HOLD DOWN AIR CLEANER PLATED1Air filter PartsGeek
0F4271BASE PLATE, AIR CLEANER1Air filter PartsGeek
0F4413HOSE UPPER RAD CPL C2 3.9L1Hose PartsGeek
0F4414HOSE LOWER RAD CPL C2 3.9L1Hose PartsGeek
0F4612SENDER OIL PRESSURE 1/8" NPT (H-PANEL)1Sensor PartsGeek
0F5263V-BELT 31/64" X 57-3/8"1Belt Amazon eBay PartsGeek
0F5418ELEMENT AIR FILTER1Air filter Amazon eBay $18.99 PartsGeek
0F6145SEAL WEATHER .45"DIAA/RSeal PartsGeek
0F6148AThermostat; 20 deg “ON”, 40 deg “OFF”1Thermostat PartsGeek
0F6305SEAL COVER 3.18X12.7X3822Seal PartsGeek
0F6305ASEAL COVER 3.18X12.7X2831Seal PartsGeek
0F6322BOTTOM PLATE, AIR CLEANER 3.9L1Air filter PartsGeek
0F6323PLATE, AIR CLEANER TOP 3.9L1Air filter PartsGeek
0F6480BRKT L/H SIDE DC ALTERNATOR1Alternator PartsGeek
0F7030SHROUD UPPER ALTERNATOR EXCITR (1)1Shroud PartsGeek
0G0153BARBED EL 90 1/2NPT X 3/4 HOSE1Hose PartsGeek
0G02070100OIL FILTER 1.6L1Oil filter Amazon eBay $24.99 PartsGeek
0G0464GASKET INTAKE MANIFOLD 1.6L1Gasket PartsGeek
0G0465GASKET EXHAUST MANIFOLD 1.6L1Gasket PartsGeek
0G0664OIL FILTER G2 ENGINE1Oil filter Amazon eBay $35.00 PartsGeek
0G0707MANIFOLD INTAKE (USE HOSE 0G0816)1Hose PartsGeek
0G0788PULLEY DC ALTERNATOR (3600 RPM)1Alternator Amazon eBay PartsGeek
0G0795HOSE LOWER RADIATOR G21Hose PartsGeek
0G0816HOSE UPPER RADIATOR G2 (USED WITH MANFLD P/N 0G0707)1Hose PartsGeek
0G0823V-BELT 3/8 X 30.6 (3600RPM)1Belt Amazon eBay PartsGeek
0G0950GASKET INTAKE MANIFOLD G21Gasket PartsGeek
0G0951GASKET EXHAUST MANIFOLD1Gasket PartsGeek
0G0952POLY V-BELT G2 (3600 RPM)1Belt Amazon eBay $40.00 PartsGeek
0G10080103GASKET, PCV VALVE1Gasket PartsGeek
0G10080288CABLE, SPARK PLUG, NO.11Spark plug Amazon eBay $25.00 PartsGeek
0G10080289CABLE, SPARK PLUG, NO.21Spark plug Amazon eBay PartsGeek
0G10080290CABLE, SPARK PLUG, NO.31Spark plug Amazon eBay PartsGeek
0G10080291CABLE, SPARK PLUG, NO.41Spark plug Amazon eBay PartsGeek
0G1472ACAM SENSOR PIN ASSY1Sensor PartsGeek
0G1985HOSE BARB REDUCR TEE 3/4"-3/8"1Hose PartsGeek
0G2750PULLEY 69 OD DC ALTERNATOR (1800 RPM)1Alternator PartsGeek
0G3167O-RING 2-3/4 X 3/32 X 2-15/162Seal PartsGeek
0G3178HOSE BREATHER 1.6L1Hose PartsGeek
0G3461ALTERNATOR SUPPORT BLOCK OFF2Alternator PartsGeek
0G3823O-RING SIZE 9.0MM X 2.0MM NITR2Seal PartsGeek
0G3921AVR SENSOR ASSY 3/8-24 LOW SENS1Sensor PartsGeek
0G3985TUBE CAC IN G2 TURBO1Turbocharger PartsGeek
0G3989TUBE CAC OUT G2 TURBO1Turbocharger PartsGeek
0G3990COOLER OIL 2.4L G2 TURBO1Turbocharger PartsGeek
0G4070HOSE REAR COOLANT 1.6L1Hose PartsGeek
0G4071HOSE UPPER RADIATOR 1.6L1Hose PartsGeek
0G4080HOSE LOWER RADIATOR 1.6L1Hose PartsGeek
0G4604DC ALTERNATOR ADAPTER MACHINED1Alternator PartsGeek
0G4949V-BELT 3/8 X 31.6 (1800RPM)1Belt Amazon eBay PartsGeek
0G7461STARTER MOTOR 12V1Starter PartsGeek
0G7902TUBE TURBO OIL RETURN G2 2.4L1Turbocharger PartsGeek
0G8690GASKET 2.4L G21Gasket PartsGeek
0G8692GASKET 2.4L G21Gasket PartsGeek
0G8830HOSE UPPER RADIATOR 2.4L1Hose PartsGeek
0G8831HOSE LOWER RADIATOR 2.4L1Hose PartsGeek
0G8854SPARK PLUG WIRE SET 2.4L G2 IG1Spark plug PartsGeek
0G9329ADAPTOR OIL FILTER 2.4L G21Oil filter PartsGeek
0G9330NUT OIL FILTER ADAPTOR 2.4L G21Oil filter PartsGeek
0G9331MOUNT REMOTE OIL FILTER 2.4 G21Oil filter PartsGeek
0G9332AOIL LINE REMOTE ENG/COOLER1Hose PartsGeek
0G9332BOIL LINE REMOTE COOLER/FILTER1Hose PartsGeek
0G9332COIL LINE REMOTE FILTER/ENGINE1Hose PartsGeek
0G9333NIPPLE-OIL FILTER1Oil filter PartsGeek
0G9349O-RING 1" X 1.25" X 1/8" VITON1Gasket PartsGeek
0G9350O-RING 2.5"X 2.75"X 1/8" VITON1Gasket PartsGeek
0G9473DEFLECTOR INTAKE 2.4L G2 TURBO1Turbocharger PartsGeek
0G9936TURBOCHARGER 2.4L 36KW 1800RPM1Turbocharger PartsGeek
0H0028ADAPTOR-AIR CLEANER1Air filter PartsGeek
0H0035HOSE AIR INTAKE1Hose PartsGeek
0H0788GASKET EXH MAN/TURBO1Gasket PartsGeek
0H0789GASKET TURBO/EXHAUST 2.4L 36KW1Gasket PartsGeek
0H0935TUBE TURBO OIL RETURN G2 36KW1Turbocharger PartsGeek
0H1432BMANIFOLD EXH 60K G2 TURBO (MA)1Turbocharger PartsGeek
0H1546HOSE UPPER RADIATOR G2 (USED WITH MANFLD P/N 0G8488)1Hose PartsGeek
0H1827PROBE COOLANT LEVEL 3/8-18NPTF (USE WITH I/N 40, P/N 0H1851)1Sensor PartsGeek
0H1851ASSY PCB LCL SENSOR (USE WITH I/N 33, P/N 0H1827 ONLY)1Sensor PartsGeek
0H20620ST03ARM BELT TENSIONER1Belt PartsGeek
0H2250HOSE COOLANT 3/8 ID 20R3 (11” LG)1Hose PartsGeek
0H2811TURBOCHARGER G2 2.4L1Turbocharger PartsGeek
RC12LC4Spark PlugSpark plug Amazon eBay $26.61 PartsGeek
005616-0Extreme Cold Weather KitService part / kit Amazon eBay $219.99 PartsGeek
005621-0Auxiliary Transfer Switch Contact KitService part / kit Amazon eBay PartsGeek
005630-0Cold Weather KitService part / kit Amazon eBay PartsGeek
005632-0Cold Weather KitService part / kit PartsGeek
005651-0Base Plug KitService part / kit Amazon eBay PartsGeek
005656-0Scheduled Maintenance KitService part / kit Amazon eBay PartsGeek
005703-0Paint KitService part / kit Amazon eBay PartsGeek
005704-0Paint KitService part / kit Amazon eBay PartsGeek
005928-0Wireless RemoteService part / kit PartsGeek
005951-0Advanced Wireless RemoteService part / kit PartsGeek
005984-0Scheduled Maintenance KitService part / kit PartsGeek
006186-0Power Management Module (50 Amps)Service part / kit Amazon eBay $66.89 PartsGeek
006204-0Extreme Cold Weather KitService part / kit PartsGeek
006205-0Scheduled Maintenance KitService part / kit PartsGeek
006463-1Mobile Link™Service part / kit PartsGeek
006478-0Harness Adapter KitService part / kit PartsGeek
006502-0Generac generator componentService part / kit PartsGeek
006504-0Generac generator componentService part / kit PartsGeek
006505-0Generac generator componentService part / kit PartsGeek
006506-0Generac generator componentService part / kit PartsGeek
006507-0Generac generator componentService part / kit PartsGeek
006510-0Generac generator componentService part / kit PartsGeek
006511-0Generac generator componentService part / kit PartsGeek
006512-0Generac generator componentService part / kit PartsGeek
006513-0Generac generator componentService part / kit PartsGeek
006516-0Generac generator componentService part / kit PartsGeek
006517-0Generac generator componentService part / kit PartsGeek
006558-0Maintenance KitService part / kit PartsGeek
006559-0Maintenance KitService part / kit PartsGeek
006560-0Maintenance KitService part / kit PartsGeek
006570-0Fuel LockService part / kit PartsGeek
006571-0Fuel LockService part / kit PartsGeek
006572-0Fuel LockService part / kit PartsGeek
006664-0Paint KitService part / kit PartsGeek
006665-0Local Wireless RemoteService part / kit PartsGeek
006873-0Wireless Remote Extension HarnessService part / kit PartsGeek
020746SCREW PPHM M5-0.8 X 8 ZINC3Service part / kit PartsGeek
021991EARTH STRAP1Service part / kit PartsGeek
022127NUT HEX 1/4-20 STEEL4Service part / kit PartsGeek
022129WASHER LOCK M8-5/169Service part / kit PartsGeek
022131WASHER FLAT 3/8-M10 ZINC4Service part / kit PartsGeek
022145WASHER FLAT 5/16-M8 ZINC6Service part / kit PartsGeek
022152WASHER LOCK #104Service part / kit PartsGeek
022158NUT HEX #10-32 STEEL4Service part / kit PartsGeek
022195WASHER LOCK 1/21Service part / kit PartsGeek
022196NUT HEX 1/2-13 STEEL1Service part / kit PartsGeek
022237WASHER LOCK 3/86Service part / kit PartsGeek
022241NUT HEX 3/8-16 STEEL6Service part / kit PartsGeek
022259NUT HEX 5/16-18 STEEL2Service part / kit PartsGeek
022261WASHER SHAKEPROOF INT 3/81Service part / kit PartsGeek
022264WASHER LOCK #8-M44Service part / kit PartsGeek
022287SCREW HHC 1/4-20 X 3/4 G52Service part / kit PartsGeek
022302WASHER LOCK 7/165Service part / kit PartsGeek
022304WASHER FLAT 1/2 ZINC1Service part / kit PartsGeek
022447WASHER SHAKEPROOF INT 1/42Service part / kit PartsGeek
022471NUT HEX #8-32 STEEL4Service part / kit PartsGeek
022770SCREW RHM 1/4-20 X 34Service part / kit PartsGeek
022859SCREW RHM #10-32 X 3/46Service part / kit PartsGeek
023334SCREW HHC 1/4-28 X 1/2 G56Service part / kit PartsGeek
023365WASHER SHAKEPROOF INT #84Service part / kit PartsGeek
023454KEY WOODRUFF #E1Service part / kit PartsGeek
023484NBUSHING SNAP SB-2.5-312Service part / kit PartsGeek
023762WASHER SHAKEPROOF EXT #10 STL1Service part / kit PartsGeek
023897WASHER FLAT #10 ZINC4Service part / kit PartsGeek
024196SCREW RHM 1/4-20 X 3-1/24Service part / kit PartsGeek
024469SCREW HHTT #10-32 X 3/8 CZ1Service part / kit PartsGeek
025065NIPPLE PIPE 3/8 NPT X 1-1/21Service part / kit PartsGeek
025105SCREW RHMS 6-32 X 1/4 ZINC1Service part / kit PartsGeek
025424NIPPLE PIPE 3/4 NPT X 61Service part / kit PartsGeek
025433LUG SLDLSS #6-14 X 13/64 CU1Service part / kit PartsGeek
025507WASHER SHAKEPROOF EXT 7/16 STLREFService part / kit PartsGeek sinocmp $469.00
026073APLUG STD PIPE 1/4 STEEL SQ HD3Service part / kit PartsGeek
026204WASHER SHAKEPROOF INT 5/161Service part / kit PartsGeek
026490NIPPLE PIPE 3/4NPT X 21Service part / kit PartsGeek
026812ELBOW 90D 3/4NPT2Service part / kit PartsGeek
026850WASHER SHAKEPROOF EXT 1/4 STL1Service part / kit PartsGeek
026915NIPPLE CLOSE 3/4 X 1.3752Service part / kit PartsGeek
026925PLUG STD PIPE 3/8 STEEL SQ HD1Service part / kit PartsGeek
027482WASHER SHAKEPROOF EXT 5/16 STL2Service part / kit PartsGeek
027738APIPE TEE 3/8 NPT1Service part / kit PartsGeek
029289TAPE ELEC 1/2 FOAM (AS REQ’D)2Service part / kit PartsGeek
029333ATIE WRAP UL 7.4” X .19” BLK9Service part / kit PartsGeek
029673DIO BRIDGE 25A 600V1Service part / kit PartsGeek
030131ELBOW 90D 1-1/4 NPT1Service part / kit PartsGeek
031919PLUG STD PIPE 3/8 COUNTERSUNKService part / kit PartsGeek
031971BEARING #6205 2NSE C3 E SRI2 S1Service part / kit PartsGeek
034339BARBED EL 90 3/8 NPT X 5/81Service part / kit PartsGeek
034413SCREW HHM #10-32 X 1-1/48Service part / kit PartsGeek
035480BOLT U 5/16-18 X 2.061Service part / kit PartsGeek

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
1.04
25%1.87
50%3.63
75%5.06
100%6.98
Prime11.393.01
Prime25%8.0252.12
Prime50%15.4064.07
Prime75%21.4625.67
Prime100%29.7517.86
Standby2.50.7
Standby25%9.12.9
Standby50%12.33.3
Standby75%15.04.0
Standby100%17.84.7

Available documents

Brochure — 0172950SBY (Generac)Spec sheet — 0172480SBY (Generac)Spec sheet — 0172940SBY (Generac)Spec sheet — 0187690SBY (Generac)Spec sheet — 0199380sby-c-qt025-30-45-60 (Generac)

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