The Generac SG080 is an 80-kilowatt industrial natural gas and propane standby generator from Generac's commercial SG Series lineup. At this capacity, the SG080 serves retail outlets, restaurants, mid-size hotels, multi-family properties, and schools that need code-compliant backup power without on-site diesel fuel management. The naturally aspirated Generac industrial engine platform is designed for stationary standby duty, meeting EPA Stationary Spark Ignition emissions standards and carrying UL 2200 listing.
Mounting flexibility — open skid, sound-attenuated aluminum enclosure, or weather-protective aluminum enclosure — makes the SG080 adaptable to rooftop mechanical rooms, utility yards, and urban installations subject to local noise ordinances. Generac's Power Zone controller provides digital metering and remote monitoring via their Mobile Link platform.
We encounter the SG080 and similar light-commercial Generac gaseous units at facilities that selected natural gas to eliminate fuel delivery logistics and diesel spillage risk. Servicing these units requires Generac-specific parts and, for deep controller diagnostics, Generac dealer tooling. Routine maintenance — ignition system inspection, air filter service, coolant checks — follows standard gaseous generator practice. For facilities already using Generac residential units and familiar with Mobile Link, the SG Series provides consistent monitoring across the property.
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Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.
Estimate runtime on this tank
Fuel demand at 75% load
840,000 BTU/hr≈ 840.0 cf/min @ 1,000 BTU/cf
On utility natural gas the runtime is generally unlimited provided the supply line and meter can deliver this BTU/hr at the engine's required inlet pressure (typically 5–14" WC residential, up to 5 psi commercial). Confirm against the OEM's published fuel-pressure spec.
Service intervals
Manufacturer-recommended intervals for the Generac SG080 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.
Oil & filter
Every 250 hours or 12 months
Coolant change
Every 4000 hours
Air filter
Every 1000 hours
Spark plugs
Every 1500 hours
Major overhaul
≈ 15,000 hours
Load bank test
Every 12 months
Common failure modes
What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.
Component
Symptom
Typical hours
Severity
Spark plugs / ignition
Misfire under load, hard starting
1,500+
minor
Battery
Failed to start during outage
8,760+
minor
Coolant system
Overtemp, coolant loss
6,000+
minor
Frequently Asked Questions
What is the Generac SG080 best suited for?
The SG080 targets mid-size commercial facilities — retail stores, restaurants, hotels, multi-family buildings, and schools — where 80 kW of natural gas or propane standby power covers critical loads without the fuel storage and permitting requirements of diesel.
How does the SG080 compare to the Kohler KG80?
Both are 80 kW gaseous standby at 1800 RPM. Generac typically prices below Kohler at equivalent capacity and uses a naturally aspirated large-displacement engine rather than a turbocharged design. The Kohler KG80 benefits from Kohler's deep commercial ATS integration; the SG080 pairs with Generac's Mobile Link remote monitoring platform.
Can the SG080 run on both natural gas and propane?
Yes. The SG080 is dual-fuel capable from the factory, supporting both natural gas and liquid propane. Fuel selection and supply pressure requirements are specified at time of order and confirmed during startup commissioning.
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