Start Cart vs. Portable GPU: Why Operators Are Switching

For decades, the default way to give a turbine engine a hand starting was a diesel or gasoline start cart — a wheeled generator towed out to the aircraft, plugged in, run up, and towed back. It works, but it comes with a fixed cost every time: fuel, an operator, a tow vehicle, hangar floor space, and a maintenance schedule of its own. Over the past decade, a growing share of that job has shifted to battery-based portable ground power units (GPUs) — lightweight, single-person, plug-and-start devices like the StartStick GPU. Here's what actually changes when an operator makes that switch.

The Core Difference

A start cart is a small power plant: an engine, an alternator, fuel storage, and enough mass to stay stable while towed. A portable GPU is a battery pack with a case and a connector — no combustion, no fuel, no engine to service. That single design difference is where every other difference in this comparison originates.

Where the Cost Actually Lives

A start cart's purchase price is only the entry cost. The real, recurring cost is everything that keeps it usable: fuel, a scheduled engine service interval, tire and battery replacement on the cart itself, and a line technician's time to fetch it, position it, and return it after every start. None of that shows up on the original invoice, but it shows up every single dispatch.

A portable GPU removes almost all of that. There's no fuel to buy or store, no engine to service, and because it weighs 10–20 lbs rather than several hundred, one person carries it directly to the aircraft instead of towing a cart across the ramp. The StartStick line uses Li-Ion Nanophosphate™ cells rated for 2-year warranty coverage and rugged, sealed operation — the maintenance line item essentially disappears.

Dispatch Reliability

A start cart that won't start is a familiar problem — a cold engine, a fuel issue, a flat battery on the cart itself. That failure mode doesn't exist on a charged battery-based GPU: press the button, get power. For operators running early-morning or remote-base departures where a delayed start cart means a delayed flight, that reliability difference is often the deciding factor, independent of the cost math.

Where Start Carts Still Make Sense

This isn't a case that carts are obsolete. A large ground power cart still delivers more sustained current than a portable unit and remains the right tool for continuous ground power — running avionics and environmental systems during extended maintenance, for example, rather than a single engine start. The comparison in this article is specifically about the engine-start use case, where a portable GPU only needs to deliver a short, high-current pulse rather than sustained output.

Who's Making the Switch

StartStick GPUs are in service with Airbus H145 and H135 operators, Leonardo AW139, AW169 and NH-90 fleets, Bell 412EPX and 429 operators, and U.S. Special Operations Aviation — with more than 2,500 units deployed globally since the product line's introduction in 2014. That adoption pattern tracks closely with operators who run frequent starts across dispersed locations, where towing a cart to every aircraft stops being practical at scale.