Cecilia and Mike from Metuchen, NJ have been Green Sun Energy Services clients since January of 2021. The machine is a Generac 7043-2 rated 22 kW on propane and 19.5 kW on natural gas, running on natural gas, on a 200-amp transfer switch, and it was commissioned in August of 2021. At about 4,565 square feet this is one of the larger houses on a 22 kW machine, which is where the load calculation stops being a formality: the number that matters is what runs at once, not what is installed. Green Sun has serviced it in September of 2022, October of 2023, September of 2024 and September of 2025.
Project Facts
- Location
- Metuchen, NJ
- Services
- Standby Generator Installation, Standby Generator Service
- Client since
- January 2021
- Manufacturer
- Generac Model # 7043-2
- Rated output
- 22 kW LP / 19.5 kW NG
- Fuel
- Natural Gas
- Electrical service
- 200 amp
- Transfer switch
- 200 amp
- Load management
- Managed Whole House
Standby generator questions from Metuchen homeowners
Will a 22 kW generator run an entire Metuchen house?
For many homes, yes, but that does not mean every load can run at the same moment. Houses with two central air conditioners, electric heat, EV charging, pool equipment or electric cooking may need load management or a larger machine. The answer comes from a load calculation rather than from the phrase whole house.
How is the gas pipe size worked out?
From the generator's demand, the available pressure, the pipe length, the allowable pressure drop, the fittings, the pipe material and every other appliance connected to the system. The adopted fuel-gas code carries the sizing requirements and tables, and the model's published fuel consumption goes into the calculation.
Does a 200-amp service need a 200-amp transfer switch?
A transfer switch installed in the service path has to be rated appropriately for the service and the configuration. A 200-amp service commonly uses a 200-amp service-rated switch, but the actual design is confirmed by the electrician rather than assumed from the service size.