GENERATORINSTALLATION

A standby generator is permanently installed, connected to your building's electrical system through a transfer switch, and runs on natural gas or propane from a fixed supply line. It starts automatically when utility power fails and transfers your selected loads without any manual action. A portable generator requires someone to start it, connect it manually, and run extension cords or a temporary connection — and without a proper transfer switch, connecting it to your building's wiring creates a serious backfeed hazard for utility workers. For commercial applications, a standby system with an automatic transfer switch is the only practical and code-compliant solution.

A transfer switch is an electrical device that disconnects your building from the utility grid before connecting the generator to your circuits. This prevents generator power from backfeeding onto the utility lines — a condition that creates a lethal hazard for utility workers restoring power and can damage the generator. The NEC requires a transfer switch for any permanently installed generator connection. We install both manual and automatic transfer switches, depending on the application and whether automatic failover is required.

Generator sizing starts with a load analysis — identifying which circuits and equipment need to be on backup power and adding up their electrical demand. For most commercial applications, the goal is not to power the entire building but to cover the critical loads: refrigeration, essential lighting, life-safety systems, POS or server infrastructure, and whatever else the business cannot function without during an outage. Oversizing a generator increases both the equipment cost and ongoing fuel consumption. We perform the load analysis as part of our scoping process and size the generator to match the actual critical load — not a round number.

The electrical work itself — transfer switch installation, wiring, and load testing — typically takes one to two days, depending on the scope. The longer variable is the generator lead time. Commercial standby generators often have lead times of several weeks to a few months, depending on the size and the manufacturer's current availability. We recommend starting the process well before the severe weather season in Minnesota, when demand for generators tends to spike and lead times extend further.

Standby generators need periodic exercise — typically a weekly automatic self-test — to keep the engine components lubricated and confirm the system will start when needed. Beyond that, they require scheduled oil changes, coolant checks, battery inspection, and load bank testing on an annual or bi-annual basis, depending on the manufacturer's recommendations and the criticality of the application. We can set up a maintenance schedule as part of the installation so the generator is serviced on the right interval and documented for compliance purposes.