Standby generator accessories
Transfer switches, maintenance kits and must-have extras for the generators we review, all sold on Amazon. Pick your brand to filter.
Automatic transfer switches
Buying guide →The switch that senses the outage and moves your home to generator power. Match the amperage to your panel.
- Transfer switchChampion aXis automatic transfer switchOfficial Champion
The Wi-Fi-enabled aXis ATS with priority load management — the brain that lets a 14kW unit run a bigger home. Fits: Champion 14kW. Confirm the amperage (100A/150A/200A) matches your panel.
- Transfer switchGenerac 200A service-entrance automatic transfer switchOfficial Generac
The official 200A ATS Generac bundles with Guardian kits — buy it separately if your kit arrives without one or you're replacing a failed switch. Fits: Guardian 26kW, Guardian 24kW, Guardian 22kW, Guardian 18kW, Guardian 14kW.
- Transfer switchKohler RXT 200A automatic transfer switchOfficial Kohler
Kohler's RXT switch with built-in load shedding, the match for RESCL/RCAL generators bought as bare units. Fits: Kohler 26RCAL, Kohler 20RESCL.
Maintenance kits & oil
Annual service kits with oil, filters and plugs — the cheap insurance that keeps the warranty valid.
- MaintenanceChampion standby generator maintenance kitOfficial Champion
The annual service kit for the aXis line — cheap insurance for the 10-year warranty. Fits: Champion 14kW.
- MaintenanceGenerac scheduled maintenance kit (oil, filter, plugs, air filter)Official Generac
Everything for the annual oil-and-filter service in one box, matched to the G-Force engine. Fits: Guardian 26kW, Guardian 24kW, Guardian 22kW, Guardian 18kW, Guardian 14kW.
- MaintenanceKohler home generator maintenance kitOfficial Kohler
Oil, filter, spark plugs and air filter sized for the Command PRO V-twin. Fits: Kohler 26RCAL, Kohler 20RESCL.
- MaintenanceFull-synthetic 5W-30 small-engine oil (2-pack)Universal fit
What most air-cooled standby engines drink. Keep a spare quart next to the generator.
Batteries & cold weather
Dead crank batteries are the #1 no-start cause. Maintainers and cold-weather kits fix that.
- BatteryAutomatic battery trickle charger / maintainerUniversal fit
Dead batteries are the #1 reason standby generators fail to start. A maintainer keeps the crank battery topped up year-round.
- BatteryGroup 51R / U1R generator starting batteryUniversal fit
The crank battery most standby units need (not included with the generator). Check your manual for the exact group size. Group size varies by model — confirm before ordering.
- Cold weatherStandby generator cold-weather kit (battery warmer + oil heater)Universal fit
Keeps oil and battery warm so the unit cranks on the coldest nights. Champion's aXis doesn't need one; most others benefit below freezing.
Protection & extras
Whole-house surge protectors, weather covers and propane gauges.
- Surge protectionWhole-house surge protector (Type 1, panel-mount)Universal fit
Generators switch power abruptly — a panel surge protector guards your electronics from the transition. Cheap peace of mind.
- CoverStandby generator weather coverUniversal fit
A breathable cover for units that sit unused for months. Remove it before the weekly exercise cycle. Measure your enclosure — air-cooled units vary in size.
- OtherPropane tank float gaugeUniversal fit
Know your LP level at a glance. Running dry mid-outage is the most avoidable generator failure there is.
Compatibility checked October 2026. Confirm your exact model on the listing before buying.