Specifications
| Fuel | NG/LP |
|---|---|
| Frequency | 60.0 Hz |
| Standby power | 40 kW |
| Prime power | 40 kW |
| Emissions | EPA & SCAQMD |
| Controller | Power Zone 410 |
| Oil capacity | 11.0 L |
| Alternator | Generac Synchronous (Class H insulation) |
| Voltage options | 120/240 V, 208/120 V, 240/120 V, 480/277 V |
| Phase | 1-Phase or 3-Phase |
| Rated current | 167 A |
| Circuit breaker | 200 A |
| Battery group | 27R |
| Battery cranking | 725 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 11 L |
| Max ambient | 50 °C |
| Sound level | 64.0 dBA @ 7 m |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Filter | — | find | ||
| Fuel filter | — | find | |||
| Oil filter | Oil Filter Type: Full Flow Spin-On Cartridge | — | find | ||
| Belt | — | find | |||
| Coolant | — | ||||
| Oil | 4.5 L Gaseous Engine Regular Maintenance Kit | 4.5 L | G0079910 | Amazon eBay |
Common questions
What is the power rating of the Generac XG04045?
The Generac XG04045 is rated 40 kW standby.
What fuel does the Generac XG04045 use?
The Generac XG04045 runs on NG/LP.
What alternator does the Generac XG04045 use?
The Generac XG04045 uses a Generac Synchronous alternator. Insulation class H.
Troubleshooting
3Fault codes
| Code | Meaning |
|---|---|
| W000209 | Loss of life. |
| W000146 | Do not alter construction of, installation, or block ventilation for generator. Failure to do so could result in unsafe operation or damage to the generator. |
| W000163 | Do not open or mutilate batteries. Batteries contain electrolyte solution which can cause burns and blindness. If electrolyte contacts skin or eyes, flush with water and seek immediate medical attention. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
43| Part # | Description | Qty | System | |
|---|---|---|---|---|
| G0079910 | 4.5 L Gaseous Engine Regular Maintenance Kit | 1 | Air filter | Amazon eBay |
| G0079920 | Battery Heater Kit | 1 | Battery heater kit | Amazon eBay |
| G0089360 | Power Zone Gateway Kit | 1 | Gateway kit | Amazon eBay |
| G0089370 | Power Zone 410 I/O Extender Kit | 1 | Io extender kit | Amazon eBay |
| G0098511 | Remote Annunciator Panel with 8 Relays | 1 | Annunciator panel | Amazon eBay $134.75 |
| G0098531 | Remote Annunciator Panel without Relays | 1 | Annunciator panel | Amazon eBay $139.99 |
| G0099120 | NFPA 110 Controller Kit | 1 | Controller | buy |
| G0099150 | Baseframe Blockoff Kit, XG03245, XG04045, & XG04845 | 1 | Baseframe blockoff kit | buy |
| G0099160 | Engine Fluid Containment Kit, XG03245, XG04045, & XG04845 | 1 | Engine fluid containment kit | buy |
| G0099230 | Engine Block Heater Kit | 1 | Engine block heater kit | buy |
| G0056510 | Base plugs to fit in the lifting holes of the baseframe to keep debris out. | 1 | Service part / kit | Amazon eBay |
| G0070000 | 50 A Smart Management Module (SMM) helps optimize the performance of the standby generator by managing large electrical loads upon startup and shed them to aid in recovery when overloaded. | 1 | Service part / kit | Amazon eBay $70.00 |
| G0070001 | 50 A Load Manager helps optimize the performance of the standby generator by managing large electrical loads upon startup and shed them to aid in recovery when overloaded. | 1 | Service part / kit | Amazon eBay $125.00 |
| G0070050 | The Tank Utility monitor integrates with Mobile Link to provide tank level readings, offering customers peace of mind. | 1 | Service part / kit | Amazon eBay |
| G0070060 | 100 A Smart Management Module (SMM) helps optimize the performance of the standby generator by managing large electrical loads upon startup and shed them to aid in recovery when overloaded. | 1 | Service part / kit | Amazon eBay |
| G0070061 | 100 A Load Manager helps optimize the performance of the standby generator by managing large electrical loads upon startup and shed them to aid in recovery when overloaded. | 1 | Service part / kit | Amazon eBay |
| G0070090 | The Propane Tank Fuel Level Monitor connects to 4G LTE cellular service to measure and report the amount of LP fuel remaining in the tank. The app alerts the user of both remaining LP fuel and usage reports. | 1 | Service part / kit | Amazon eBay |
| G0074110 | 3-Phase Voltage Sensing Kit for 208/120 & 240/120 V RTS Transfer Switch | 1 | Service part / kit | Amazon eBay |
| G0074120 | 3-Phase Voltage Sensing Kit for 480/277 V RTS Transfer Switch | 1 | Service part / kit | Amazon eBay |
| G0079900 | Recommend for operating environments where the temperature drops below -18°C (0° F); externally powered by 120 VAC, 60 Hz. | 1 | Service part / kit | Amazon eBay |
| G0079930 | Enclosure Mounted Emergency Stop Kit | 1 | Service part / kit | Amazon eBay |
| G0089350 | Emergency Stop switch that can be mounted separate from the generator such as near an electrical panel. | 1 | Service part / kit | buy |
| G0098521 | Remote Relay Panel | 1 | Service part / kit | Amazon eBay |
| G0099010 | Voltage Configuration Cartridge (VCC) for 208/120 V 3-Phase output; INSTALLED in every 3-phase XG03245 and XG04045 model. | 1 | Service part / kit | buy |
| G0099020 | Voltage Configuration Cartridge (VCC) for 240/120 V 3-Phase output; NOT included with any XG03245 or XG04045 model. | 1 | Service part / kit | buy |
| G0099030 | Voltage Configuration Cartridge (VCC) for 480/277 V 3-Phase output; NOT included with any XG03245 or XG04045 model. | 1 | Service part / kit | buy |
| G0099040 | 3-pole, 60 A CB and mounting hardware (typical for 32 kW, 480/277 V 3-phase generator). | 1 | Service part / kit | buy |
| G0099050 | 3-pole, 80 A CB and mounting hardware (typical for 48 kW, 480/277 V 3-phase generator). | 1 | Service part / kit | buy |
| G0099060 | 3-pole, 100 A CB and mounting hardware (typical for 32 kW, 240/120 V 3-phase generator). | 1 | Service part / kit | buy |
| G0099070 | 3-pole, 125 A CB and mounting hardware (typical for 32 kW, 208/120 V; and 40 kW, 240/120 V 3- phase generators). | 1 | Service part / kit | buy |
| G0099080 | 3-pole, 150 A CB and mounting hardware (typical for 40 kW, 208/120 V and 48 kW, 240/120 V 3- phase generators). | 1 | Service part / kit | buy |
| G0099090 | 3-pole, 175 A CB and mounting hardware (typical for 48 kW, 208/120 V 3-phase generator). | 1 | Service part / kit | buy |
| G0099100 | 3-color LED providing at-a-glance indication of generator ready-to-run status. The display mounts to the front of the generator and plugs into the wire harness. | 1 | Service part / kit | buy |
| G0099110 | Further reduces sound level of generator; assembles to top of generator enclosure exhaust discharge area. | 1 | Service part / kit | buy |
| G0099130 | Increases wind speed rating of generator to 186 mph (300 km/h). The kit assembles to the exterior of the generator enclosure and frame. | 1 | Service part / kit | buy |
| G0099140 | Support structure for mounting a generator on a rooftop or elevated frame; does NOT include the frame itself. | 1 | Service part / kit | buy |
| G0099170 | Anchor bolts for securing the generator in a defined, seismically active area with recommended mounting surface recommendations; does not supersede local building codes or requirements. | 1 | Service part / kit | buy |
| G0099180 | It is important to touch-up the paint to protect against corrosion if the generator enclosure is scratched or damaged. The paint kit includes the necessary paint to correctly maintain or touch-up a generator enclosure. | 1 | Service part / kit | Amazon eBay |
| G0099190 | 3-pole, 70 A CB and mounting hardware (typical for 40 kW, 480/270 V 3-phase generator). | 1 | Service part / kit | buy |
| G0099200 | 3-pole, 200 A CB and mounting hardware (typical for 40kW, 208/120 V 3-phase generator) | 1 | Service part / kit | buy |
| G0099250 | Remote Emergency Stop Kit, Surface Mount | 1 | Service part / kit | Amazon eBay |
| G0099260 | Remote Emergency Stop Kit, Flush Mount | 1 | Service part / kit | Amazon eBay |
| G0099270 | Remote Emergency Stop kit, Break Glass | 1 | Service part / kit | Amazon eBay |
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
| Rating | Load | L/h | gal/h |
|---|---|---|---|
| Prime | 25% | 10.0 | 2.6 |
| Prime | 50% | 14.5 | 3.8 |
| Prime | 75% | 17.7 | 4.7 |
| Prime | 100% | 21.7 | 5.7 |
| Standby | 25% | 8.3 | 2.2 |
| Standby | 50% | 12.9 | 3.4 |
| Standby | 75% | 15.8 | 4.2 |
| Standby | 100% | 18.5 | 4.9 |
Available documents
Spec sheet — 32-40kw-protector-xg-standby-generator-specsheet (Generac)Spec sheet — a0005286945-(1) (Generac)Operator's manual — generac-xg04045anac-owners-manual (Generac)Owner's manual — generac-xg04045anac-installation-sheet (Generac)Parts manual — 0Parts manual — generac-xg04045anac-specification-sheet (Generac)Parts manual — xg03245-xg04045 hsb specsheet (Generac)