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 switch Champion aXis automatic transfer switch Official 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 switch Generac 200A service-entrance automatic transfer switch Official 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 switch Kohler RXT 200A automatic transfer switch Official 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.
- Maintenance Champion standby generator maintenance kit Official Champion
The annual service kit for the aXis line — cheap insurance for the 10-year warranty. Fits: Champion 14kW.
- Maintenance Generac 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.
- Maintenance Kohler home generator maintenance kit Official Kohler
Oil, filter, spark plugs and air filter sized for the Command PRO V-twin. Fits: Kohler 26RCAL, Kohler 20RESCL.
- Maintenance Full-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.
- Battery Automatic battery trickle charger / maintainer Universal fit
Dead batteries are the #1 reason standby generators fail to start. A maintainer keeps the crank battery topped up year-round.
- Battery Group 51R / U1R generator starting battery Universal 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 weather Standby 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 protection Whole-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.
- Cover Standby generator weather cover Universal 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.
- Other Propane tank float gauge Universal 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.