Kohler 12KW 120/240 Single Phase Standby Generator New - 12RES-QS11

Kohler  12KW 120/240 Single Phase Standby Generator New - 12RES-QS11

Affordable, commercial-grade power for basic power needs. When a bad storm or utility failure knocks out your power, the 12RES KOHLER generator keeps your lights on, fridge cold and sump pump working. This generator will power most appliances in smaller homes, or a few critical items in larger homes.

What our Experts Think

• Reliable whole-home backup in seconds
  The Kohler 12RES-QS11 delivers automatic power restoration in ~10 seconds, ensuring critical appliances stay running during outages—ideal for residential standby use.
• Strong 12kW output for essential loads
  With 12,000 watts of power, it can handle core home systems like lighting, refrigeration, sump pumps, and even some HVAC loads—perfect for small to mid-sized homes.
• Dual-fuel flexibility (NG + LPG)
  Runs on natural gas or liquid propane, giving users flexibility based on availability and cost—plus easy field conversion between fuel types.
• Commercial-grade engine durability
  Powered by the Kohler Command PRO® engine, built for heavy-duty performance and long-term reliability, even in demanding conditions.
• Clean, stable power for sensitive electronics
  Advanced voltage and frequency regulation ensures safe operation for modern electronics and appliances, reducing risk of damage.
• Handles high starting loads with ease
  Equipped with PowerBoost™ technology, allowing it to start large appliances (like AC units) without voltage drops.
• Designed for standby & off-grid versatility
  Works in both backup power systems and off-grid setups, with smart controller features that optimize performance and battery usage.
• Installation-ready but requires ATS
  Requires a separate automatic transfer switch (ATS) for full standby functionality—important to factor into total setup cost.

Q&A

Maintenance Tips

• Change oil & filters regularly: Replace engine oil, oil filter, and air filter per schedule to protect the Command PRO engine and extend lifespan.
• Run weekly exercise cycles: Let the generator auto-test to ensure reliable startup during outages and keep internal components lubricated.
• Inspect fuel system: Check propane/natural gas lines for leaks, blockages, or debris to maintain stable power output.
• Keep battery charged & terminals clean: A healthy battery ensures instant automatic start (typically within ~10 seconds).
• Clean air intake & enclosure: Remove dust, debris, and obstructions to maintain airflow and prevent overheating.
• Check electrical connections: Tighten terminals and inspect wiring to ensure consistent voltage and protect sensitive electronics.
• Monitor load capacity: Avoid overloading—this 12kW unit is ideal for small homes or essential circuits only.
• Schedule professional servicing annually: Ensure optimal performance, especially for transfer switch integration and control systems.