Prototype · DT-3 kW system
Built, spun up, and measured.
A 3 kW demonstration unit was constructed to test the core claim behind the architecture: that a DC motor-generator can store energy and generate electricity at the same time, recharging its own input source while it runs. These are the recorded results, not projections.
50 kg
Cast-iron flywheel
3 kW
DC motor-generator
163 A
Peak kick-start draw
5:11
Demonstration run time
What the test showed
The input pack refilled while the system was working.
Kick-start draw
A 12 V, 200 Ah kick-start pack brought the 50 kg cast-iron flywheel up to speed, drawing 163 amperes and pulling voltage from 12.11 V down to 10.53 V.
Regeneration during operation
The kick-start pack recovered its depleted charge within 3 minutes of the 5 minute 11 second run, while the system was still producing output.
Steady-state output
The system held a consistent 1,326 rpm while drawing 30 amperes, with the 3 kW motor-generator unit running at a variable 3,500 rpm.
Build-up window
Four to five minutes of flywheel build-up is required before external load is applied. An automated control unit must detect that state before actuating the output circuit.
Load ceiling
Sustained load current must stay within the motor-generator's rating. Exceeding it causes armature saturation and mechanical drag, which pulls down flywheel speed.
Output today
The prototype delivers DC only. AC output is the next objective and requires a 3 kW inverter to give the system multi-point VDC and VAC service.
Why it matters
Conventional flywheel systems store and deplete. This one regenerates while it runs.
In a typical FESS, the motor-generator cannot generate until motoring mode is switched off, after which stored energy drains down to a floor speed and the flywheel must be recharged. The DC motor-generator arrangement in the Dorcasey's system is designed to avoid that cycle, holding DC output voltage to around 90% of rated capacity under load rather than bleeding speed as external load is connected.
Demonstrated at 3 kW scale. The 10 kW system described in the technology specifications has not yet been built.