Generac PowerPact™ 7.5kW Home Standby Generator System (50-Amp 8-Circuit ATS)

In regards to your question, proper sizing of the generator is crucial to the success of any generator installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load.

A certified electrician needs to be consulted for proper sizing and installation of any generator. When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting requirements in terms of amps and voltage which can be calculated to watts using Ohms Law (Amps x Volts = Watts).

When choosing the generator output select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 8 kilowatts, select a 10 kW generator).

A higher rated generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the future.

Applications that are commercial, all-electric homes, have heat pump or geothermal systems require special installation procedures and a certified electrician must be contacted to evaluate and install these types of systems. 

Please see our Home Standby Generator Calculator as a reference.

The generator requires a Group U1, 12 volt and 300 CCA minimum battery.

Due to the control wiring and communication between the generator and transfer switch this unit will only work with a Generac branded transfer switch.

This particular unit requires utility power to be present and due to the control wiring it cannot be used off-grid. If you have a battery bank or off-grid application that has an alternative energy source, then I would recommend the Generac EcoGen 7034 unit which is made specifically for this application. Another option for off-grid would be the Kohler 14RESA, but am unsure how it would be wired. Kohler approves this unit for off-grid but has an 18-month warranty and NOT the standard 5 year.

Thanks for your inquiry.

When wiring the generator it must be in accordance with local jurisdiction and codes. If ALUMINUM conductors are used, apply corrosion inhibitor to conductors.