ElectricalBossPro Blog — Generator & Maintenance Plans

Transfer Switches and Interlocks: Keeping the Whole Backup Setup on the Property Record

A whole-house generator is never just a generator. It sits in a system with a transfer switch or an interlock, the main panel, maybe a subpanel, and often a whole-house surge protector. When a customer calls about their backup power, the tech needs to know about all of it, not just the box in the side yard. ElectricalBossPro keeps the whole setup together on the property.

Beyond the Generator Itself

The generator record, with its brand, model, serial, kW and fuel, is covered in Generator Records on the House: Brand, Model, Serial, kW and Fuel in One Place. This guide covers the rest of the backup setup that lives on the same property.

The equipment list on a property in ElectricalBossPro can include the main panel, subpanels, meter base, service entrance, whole-house generator, transfer switch, generator interlock, EV charger, whole-house surge protector, solar inverter, battery storage, pool or spa panel and exterior disconnect. Each one has room for the brand, model number, serial number, year installed, rating, phase or fuel, location and access notes.

Transfer Switch or Interlock

Houses with backup power use different setups, and the record should say which one this house has. Saving a transfer switch or a generator interlock as its own item on the property means the tech knows before arriving what they will find, and the office knows when the customer calls asking a question.

A transfer switch record might read “Transfer Switch · 200A · installed 2019 · Garage wall next to the main panel.” An interlock record might read “Generator Interlock · on main panel · Basement, utility room.” Rating, location and install year are the details that help most. The tech decides what to do with the equipment once they see it. The record just makes sure nobody is surprised.

The Panel and Surge Protection Belong Here Too

Because the generator ties into the house's electrical system, the main panel record is part of the same picture. A main panel saved as “Main Panel · 200A · Single Phase · installed 2008,” with the serial on the next line and a note like “Garage · Panel is behind the shelving,” tells the tech where to go and what is there.

A whole-house surge protector is also worth recording. If the customer has one, the safety inspection checklist includes surge protection checked. If they do not, the tech may recommend one, which becomes an estimate. More on that in Surge Protector Add-Ons: Offering Whole-House Surge Protection From the Inspection.

On the Job Card Together

When a generator visit is on the tech's phone, the job card shows every piece of equipment the job pulled from the house. The generator, the transfer switch or interlock, the main panel and the surge protector all appear together, each with its details and location. The tech sees the whole setup in one place before walking up the driveway.

The “From House” picker lets the office pull in whichever equipment applies to a job. A generator maintenance visit might pull the generator and transfer switch. A full safety inspection might pull everything on the property. Either way, nobody retypes the details.

Keeping Records Current

Equipment changes over time. A transfer switch gets replaced, a surge protector gets added, a panel gets upgraded. When that work happens on a job in ElectricalBossPro, the change flows back to the house. The next visit sees the current setup, not last year's.

The tech can also fix gaps they notice on site. If the record is missing the transfer switch rating or the year installed, the tech can add it on the job, and the house record picks it up. A few visits in, most properties on a plan have a complete picture.

Photos help with that. A quick photo of the transfer switch label or the panel directory, saved with the job, gives the office something to check the record against later without sending anyone back out.

Why the Whole Picture Pays Off

The practical payoff is fewer surprises. Techs arrive knowing what they are working with. The office can answer customer questions without calling the tech. When the inspection checklist reaches “generator / transfer switch tested,” the tech already knows which equipment that line refers to at this house.

There is a sales payoff too. A complete record shows the office which plan customers have backup power but no surge protector, or an older panel, or an EV charger that might be worth adding to the yearly visit. Those are conversations worth having. To see how the full property record fits with plans, the Waiting List and billing, head back to the ElectricalBossPro generator maintenance software page.