Ground power unit guide for the Cirrus SR22. 28V DC GPU specs, start current requirements, and equipment picks for the best-selling single-engine piston aircraft.
About the Cirrus SR22
The Cirrus SR22 redefined what a single-engine piston aircraft could be — full airframe parachute, composite construction, glass cockpit as standard, and performance that gives older light twins a serious run for the money. It's been the best-selling single-engine piston aircraft worldwide for over two decades. Its 28V electrical system (unique among most single-engine pistons, which typically use 14V) and advanced Garmin Perspective avionics make proper ground power selection important.
GPU Requirements
The SR22's Continental IO-550-N draws 500 to 900 amps at peak during cranking. The 28V system is notable — most competing single-engine pistons (Cessna 172, Diamond DA40) use 14V, so a GPU for a Cessna 172 will not work on an SR22 and vice versa. The higher voltage reflects Cirrus's design philosophy of incorporating turbine-class avionics (Garmin Perspective/Perspective+) that benefit from a 28V bus. Continuous draw for the Garmin Perspective suite, air conditioning (if equipped), and cabin electronics runs 60 to 80 amps.
Cold Weather Considerations
The IO-550 is a big-bore Continental with six cylinders of 550 cubic inches. In cold weather, it cranks like it's stirring cold molasses. Below -5°C, engine preheating is strongly recommended before a start attempt. A GPU paired with a Tanis or Reiff preheater system is the winter standard for SR22 owners based in northern states.
Recommended Ground Power Units
Battery Start Unit
Red Box RB25A
28V lithium GPU delivering 1,000A peak. Comfortably handles the IO-550's cranking demands with headroom for cold weather. Compact enough to keep in the SR22's baggage compartment.
Battery Start Unit
Start Pac Portable 28V
Lightweight lithium unit delivering 800A peak at 28V. Purpose-built for single-engine aircraft with 28V systems. Popular with SR22 owners who fly to unattended airports.
Continuous Supply
Red Box RB25CS
28V/25A continuous power supply for avionics maintenance. The Garmin Perspective system benefits from clean, stable ground power during software updates and database loading.
Need help choosing? See our GPU Sizing Guide for a step-by-step approach to matching ground power equipment to your aircraft, or compare options in our Best GPU 2026 roundup.
Related Equipment
Similar Aircraft
Frequently Asked Questions
Can I use a Cessna 172 GPU on my Cirrus SR22?
No. Most Cessna 172s use a 14V electrical system, while the SR22 uses 28V. Connecting a 14V GPU to an SR22 won't start the engine. Connecting a 28V GPU to a 14V aircraft can damage avionics. Always match the GPU voltage to the aircraft.
What GPU does the SR22T turbo need?
The SR22T (turbocharged) uses the same 28V electrical system and Continental TSIO-550 engine. GPU requirements are identical to the normally aspirated SR22 — 500 to 900A peak at 28V. The turbocharger doesn't affect starting current.
Is the Cirrus SR20 the same as the SR22 for GPU purposes?
Nearly. The SR20 uses a smaller Continental IO-360 engine (vs the SR22's IO-550) but the same 28V electrical system. The SR20 draws less peak current (400 to 700A) but uses the same 28V GPU and connector.