Power Generator Applications

A standby generator is designed to start automatically during a utility outage and run for a limited period until grid power is restored. It is sized and rated for intermittent use. A prime power generator is built to serve as the primary power source in locations where no utility connection exists, or where the utility supply is unreliable. Prime power units are rated for continuous operation and are built to different durability standards than standby equipment. The right choice depends on how your facility uses the generator and how frequently it will run.

Generator sizing starts with a load analysis, which involves calculating the total wattage of all equipment that needs to run during an outage, accounting for motor starting surge loads, which can be several times higher than the running load. For commercial and industrial facilities, this analysis should also identify which systems are truly critical versus which can tolerate an outage, since running a smaller, properly sized generator is more efficient and reliable than running an oversized one. Power Field Services can assist with this analysis as part of the equipment selection process.

Yes. Commercial generator installations in Houston typically require permits from the City of Houston's Department of Neighborhoods or the applicable jurisdiction if you are outside city limits. Depending on the installation, electrical permits and inspections may also be required. If the generator uses natural gas, coordination with the gas utility may be necessary. Permit requirements vary based on generator size, fuel type, and installation location. Working with a licensed installer helps ensure the permitting process is handled correctly from the start.

Most standby generators are designed to run for extended periods, often several days, during a prolonged outage, provided they have an adequate fuel supply and are receiving proper cooling. Diesel generators typically have on-site fuel tanks, and runtime is limited by tank capacity. Natural gas generators connected to a utility gas supply can run considerably longer, though local gas pressure and supply availability during a disaster scenario should be factored into the planning. Generator manufacturers publish rated run times at various load percentages, and Power Field Services can help you understand those specifications for any unit you are considering.

The most common fuel options for commercial generators are diesel and natural gas. Diesel generators store fuel on site, which means runtime is not dependent on utility infrastructure, but fuel must be maintained and rotated to prevent degradation. Natural gas generators connect to the utility gas line, eliminating on-site fuel storage concerns, but their runtime depends on gas supply remaining available during the outage event. Propane is a third option used in some commercial and agricultural settings. Each fuel type has trade-offs in terms of cost, storage, emissions, and reliability under specific conditions. The right choice depends on your site, your fuel infrastructure, and how long you need the generator to run independently.

An automatic transfer switch (ATS) is a device that monitors utility power and automatically transfers your facility's electrical load to the generator when utility power is lost, then transfers it back when utility power is restored. Without an ATS, someone must manually start the generator and connect the load, which introduces delay and requires personnel on site at the time of the outage. For most commercial, municipal, and critical infrastructure facilities, an ATS is a necessary part of the installation. Power Field Services evaluates transfer switch requirements as part of every generator installation recommendation.

Most commercial generator manufacturers and industry standards recommend monthly exercise runs and annual comprehensive preventive maintenance inspections. The monthly exercise cycle keeps the engine lubricated, the battery charged, and the unit ready to start. Annual maintenance covers oil and filter changes, coolant inspection, fuel system checks, electrical connections, and load bank testing to verify full output capacity. Facilities subject to NFPA 110 or other regulatory frameworks have defined maintenance and testing intervals that must be documented. Power Field Services provides scheduled maintenance programs for commercial generators throughout the Houston area.

Generators produce exhaust gases, including carbon monoxide, which makes indoor installation without proper ventilation extremely dangerous. Most commercial generators are installed outdoors in an enclosure or in a dedicated generator room with engineered exhaust routing and ventilation systems that meet code requirements. Indoor installation is possible in certain facility types with the appropriate mechanical systems in place, but it requires careful planning and code compliance. The specific requirements depend on the generator's fuel type, size, and the building codes applicable to your facility location