GENERAC RD02025GDAE Protector Series 20 kW Diesel Standby Generator - 3 Phase 120/208 V, Standard Tank

Three phase, 120/208 V. That makes it a commercial machine, not a house unit. If you are backing up a residential panel or any single phase 120/240 V service, this is the wrong voltage configuration and you need a single phase model instead.

Output current is listed at 167/84 A. The 167 A figure is what your transfer switch, feeders, and main breaker have to be sized against at the 120/208 V three phase connection. Size the ATS at or above that rating, not at the kW number.

The enclosure and base tank measure 81 in long by 31 in wide by 51 in high, and the unit weighs 1,465 lbs dry. Pour the pad larger than 81 x 31 to give yourself edge margin and service clearance, and plan rigging for a 1,465 lb lift before fuel is added.

It ships as a standard base tank configuration, so the fuel tank is integral to the skid under the enclosure. The base tank is listed to UL/CUL 142, which is the standard inspectors look for on an aboveground fuel tank. No separate day tank or gas piping is needed the way it would be on an LP or natural gas unit.

The generator is UL/CUL 2200-listed and the base tank is listed to UL/CUL 142. The unit is also CSA Certified and ETL Listed. Those are the listings an AHJ typically wants to see on a permanently installed stationary standby set with an integral fuel tank.

It uses an isochronous electronic governor, which holds engine speed (and therefore frequency) at a constant value rather than letting it droop as load is applied. That is the governor type specified for loads that do not tolerate frequency wander.

Mobile Link connectivity is standard on the Protector Series, so status can be checked from a phone, tablet, or PC off site. At the machine there is a two line multilingual LCD Evolution controller in English, Spanish, French, and Portuguese, readable through an external viewing window so a tech can see generator status and breaker position without opening the enclosure.

The enclosure and frame are aluminum, which is the right call for coastal or high-humidity sites where a steel housing rusts at the seams. It is sound attenuated, so it is intended for installs where the set sits near occupied space or a property line.

No, a smart battery charger is built in on the Protector Series. You still supply the starting battery itself and a utility feed to keep the charger energized between runs.

Built in the United States, and it is not flagged as containing chemicals that cause birth defects under California Prop 65. That matters on public and institutional bids where domestic origin documentation is part of the submittal.