GENERAC RG04845KNAX 48kW Protector Standby Generator - 277/480

No. The RG04845KNAX is a 3-phase 277/480 V unit only, rated at 200 A. If your building service is 120/208 three-phase or single-phase 120/240, this is the wrong voltage configuration and you need a different Protector model built for that service. Voltage is set by model on these units, not field-selectable.

No transfer switch is included. The RG04845KNAX is the generator only, so the ATS is a separate line item on your order and has to be sized for the 200 A, 277/480 V 3-phase output. Budget for the switch, the load-side wiring and the control conductors back to the Evolution controller when you price the job.

The enclosure measures 83.4 in deep by 35 in wide by 46 in high, so plan a pad at least that footprint plus your local pad overhang. Generac states these generators can be set as close as 18 in from a structure, which is what makes them workable on tight lot lines or narrow side yards. Still verify fuel and exhaust clearances with your local AHJ.

Either one. The 48kW Protector runs on liquid propane or natural gas, using a dual-valve ultra-low pressure fuel delivery system. Fuel choice affects the gas line sizing and regulator you run to the unit, so size the supply for the fuel you are actually connecting and confirm available pressure at the generator location before trenching.

Output quality is the spec that matters there. True Power Technology holds total harmonic distortion under 5%, which is utility-grade and suitable for sensitive electronics, and the unit has automatic voltage regulation. Rated and surge wattage are both 48,000 W, so there is no headroom above nameplate for inrush, which means motor starting loads still need a proper load calculation before you commit to this size.

At 1781 lbs, the RG04845KNAX is not a two-man set. Plan on a boom truck, skid steer with forks, or a crane pick to place it on the pad, and confirm the access route and pad design will carry that load. The all-aluminum frame and enclosure keep it lighter than a steel-housed unit of the same output, but it is still a machine lift.

The RG04845KNAX carries UL Listed, CSA Certified and ETL Listed marks, which covers the usual approval questions on commercial and institutional jobs in both the US and Canada. It also carries a Prop 65 cancer and reproductive harm warning, which matters if you are shipping into California and need the labeling in your submittal package.

Two pieces handle that. Mobile Link comes standard on Protector Series units, so status is visible from a phone, tablet or PC anywhere. On site, the Evolution controller is readable and operable without opening the enclosure, tracks maintenance intervals, and logs runtime on a built-in hour meter. Quiet-Test self-test runs a five or twelve minute exercise at reduced RPM and can be set weekly, bi-weekly or monthly.

At 48 kW you are past air-cooled territory. This one uses a Generac 4.5L liquid-cooled engine, which is what carries continuous three-phase commercial load and sustained outages; air-cooled units top out well below this output and are residential-scale. If your load calc lands under about 25 kW single-phase, an air-cooled model is the cheaper and simpler install. If you need 277/480 three-phase, liquid-cooled is the only path.

Order model RG04845KNAX. That number pins the 48 kW output, the 277/480 V 3-phase configuration and the 4.5L liquid-cooled Generac engine. Adjacent Protector models in the same enclosure carry different voltage suffixes, so quoting the full designation rather than just 48 kW avoids getting a 120/240 or 120/208 unit shipped.

The enclosure and frame are aluminum with a RhinoCoat powder-coated finish, coated inside and out so the internal frame is protected from rust as well as the skin. That is the configuration you want near salt air or on a rooftop. Factory color is Bisque, which is the neutral tone Generac uses so the unit disappears into landscaping.

Low oil shutdown and overload protection are both built in, and the unit starts automatically with an automatic override start type so it picks up load on a utility failure without anyone on site. Automatic voltage regulation holds output steady as load changes. Those are the protections that keep an unattended generator from destroying itself between service visits.

Country of origin is the United States, and Generac states the engine is purpose-built in Wisconsin. That is the documentation government, education and healthcare procurement usually needs for domestic-preference language. Confirm the exact program requirement, since Buy American thresholds vary by funding source.