If a standby generator fails to start, the cause is more often the battery or the transfer switch than the generator itself. Both are wear components with a limited service life, and both are far cheaper — and far less stressful — to replace on a planned schedule than to discover as a failure during an actual outage.
Both components are relatively inexpensive to replace during a scheduled visit and considerably more disruptive — and often more expensive — to diagnose and replace as an emergency call in the middle of an outage. This is one of the most common findings from a routine maintenance inspection, and one of the easiest problems to prevent entirely.
Battery load testing and transfer switch function testing are included in every DisplayMax maintenance visit — see Generator Maintenance Plans for what’s covered at each tier.
A generator's starting battery works differently than a car battery — it sits in a trickle-charge state most of the time and is asked for a large burst of starting current only occasionally. That pattern shortens battery life, and a failing battery is the single most common reason a generator won't start during an outage. We check for:
The automatic transfer switch (ATS) is what actually switches your home or business from utility power to generator power — and back — without you touching anything. When a transfer switch fails, the generator itself can be running perfectly and your power still won't come on, because the switch never engaged. Signs a transfer switch may need service or replacement:
A technician can usually determine this quickly: if the generator won’t crank at all, it’s most often the battery or starting circuit. If it cranks and runs but power doesn’t transfer to your home or business, it’s most often the transfer switch. Either way, we diagnose before quoting a replacement.
Yes. We work with OEM or OEM-equivalent parts across Generac and other systems regardless of who originally installed your unit.
Transfer switches generally last longer than batteries, but contacts wear with each transfer event and age-related failure does occur, particularly on older units. Frequency of switching (how often you actually lose utility power) is the biggest factor — we’ll assess condition during an inspection rather than replacing on a fixed schedule.
Coverage depends on your unit’s age, brand, and warranty terms. We’ll tell you clearly whether a component is likely still under manufacturer warranty before recommending a paid replacement.
We sure do. We can install and configure smart switches, lighting, outlets, and more. DisplayMax Electric is a full service provider of electrical services.
Request a free estimate or schedule your service now with our licensed and trusted Technicians.
