Megawatts in seconds. 100,000 cycles.
UltraCap is a utility-grade hybrid supercapacitor system. One container delivers 5 MW for 6 minutes and cycles 100,000 times without the fade of a conventional battery.
The power of a capacitor with the energy of a battery.
UltraCap uses lithium-carbon capacitor cells, an asymmetric (hybrid) supercapacitor. Charge is stored mainly by ions clinging to the electrode surface (ion adsorption), with only shallow insertion into the electrode material. The electrodes barely wear, so the cells can charge and discharge at very high rates for an exceptionally long life.
- 100,000 cycles at cell, pack and system level
- 15-year calendar life with maintenance-free cells
- Full operation from −40 °C to 60 °C, so it suits cold and hot climates alike
- Low self-discharge: ≤ 2% per month at module level
Built for high power, every cycle.
Instant response
A full 5 MW from a single 500 kWh container, with 20 ms monitoring. That suits fast frequency response, inertia support and ramp control.
100,000 cycles
It can cycle dozens of times a day for years without the capacity fade that limits conventional batteries in high-cycle duty.
Extreme temperatures
Cells charge and discharge from −40 °C to 60 °C, and liquid cooling with heating keeps the system in its ideal range.
Layered safety
A three-tier capacitor management system, IP67 packs, gas detection with explosion-proof ventilation, and perfluorohexanone and sprinkler fire suppression.
From cell to 5 MW container.
A modular building-block design scales from a single liquid-cooled pack to multi-container grid installations.
Liquid-cooled pack
45 modules in series in an IP67, liquid-cooled enclosure.
Capacitor cluster
Four packs in series with a high-voltage control box for metering, isolation and protection.
DC storage container
24 clusters in an outdoor container, with a 5 MW PCS and a 33 kV step-up skid.
Technical data
Container system
| Rated power | 5,000 kW |
|---|---|
| Nominal energy | 500 kWh (≥ 6 min at rated power) |
| Nominal capacitance | 4,000 F |
| Operating voltage | 1,000 – 1,500 VDC |
| Configuration | 360S × 24P (24 clusters, 96 packs) |
| Max. continuous current | 5,500 A |
| Cycle life | > 100,000 cycles |
| Round-trip efficiency | > 94% (system) |
| Thermal management | Liquid cooling with heating |
| Fire protection | Perfluorohexanone + water sprinkler, gas detection, explosion-proof exhaust |
| Ingress / corrosion | IP55 / C4 |
| Weight | ≈ 30 t |
| Operating temperature | −40 to 60 °C, 0–95% RH, < 2,000 m |
Power conversion & grid connection
| PCS | 2 × 2,500 kW bidirectional, 1,500 V class |
|---|---|
| PCS DC voltage range | 1,050 – 1,500 V |
| AC output | 690 VAC, three-phase, 50 Hz |
| PCS max. efficiency | 98% |
| Overload | 110% continuous, 120% ≥ 1 min |
| Power factor / THD | ≥ 0.99 / < 3% |
| Grid support | LVRT, HVRT, anti-islanding |
| Transformer | 5,250 kVA dry-type, 33 kV / 0.69 kV |
| Switchgear | Vacuum breaker, disconnector, earthing switch, surge arresters |
Cell
| Type | Lithium-carbon (hybrid) capacitor |
|---|---|
| Nominal capacitance | 15,000 F |
| Operating voltage | 2.5 – 4.2 V |
| Internal resistance (AC) | ≤ 1.2 mΩ |
| Rated / max. / peak current | 35 A / 70 A / 105 A |
| Cycle life | 100,000 cycles (2.6 – 4.0 V) |
| Calendar life | 15 years |
| Weight / size | 210 g / 132 × 65 × 13 mm |
| Operating temperature | −40 to 60 °C |
Module, pack & cluster
| Module | 8.4 V / 30,000 F, 2S4P, 5.0 – 8.2 V, ≤ 0.8 mΩ, 2.7 kg |
|---|---|
| Module current | 140 A rated, 280 A continuous, 420 A peak |
| Pack | 360 V / 666.6 F, 1P45S, 225 – 378 V, < 40 mΩ |
| Pack size / weight | 710 × 1,000 × 200 mm / ≈ 200 kg, IP67, liquid-cooled |
| Cluster | 1,500 V / 166.6 F, 4 packs in series, 900 – 1,500 V |
| Cluster size / weight | 710 × 1,000 × 830 mm / ≈ 1,000 kg |
| Dielectric withstand | DC 4,500 V, 1 min, < 1 mA |
Capacitor management system
| Architecture | Three-tier: cell monitoring unit, cluster controller, station master |
|---|---|
| Cell voltage accuracy | ± 3 mV |
| Temperature accuracy | ± 1 °C |
| Acquisition cycle | 20 ms |
| SOC accuracy | ≤ 5% error, with SOH diagnosis |
| Balancing | Passive, 100 mA |
| Communications | CAN, Ethernet, RS485 · Modbus TCP/RTU, CANopen |
Protection
| Cell over / under-voltage | 4.0 V / 2.7 V |
|---|---|
| Pack over / under-voltage | 376 V / 253.8 V |
| Cluster over / under-voltage | 1,500 V / 900 V |
| Charge / discharge over-current | 350 A |
| Temperature limits | −40 °C / 60 °C (charge & discharge) |
| Also monitored | Insulation, voltage & temperature difference, contactor and comms faults |
Specifications are for the reference 5 MW / 6 min configuration and may change without notice. Other power and duration ratings are available on request.
Where power and cycle life matter most.
Frequency control (FCAS)
Fast frequency response and regulation services that need full power in milliseconds, many times an hour.
Grid stability & inertia
Synthetic inertia, voltage support and ride-through for weak grids and high-renewable networks.
Renewable smoothing
Ramp-rate control for solar and wind farms, firming short-term output swings caused by cloud and gusts.
Industrial & mining
Capturing braking energy from cranes, hoists and haulage, and shaving peaks on heavy pulsed loads.
Hybrid with batteries
Pair it with a long-duration battery: UltraCap takes the high-power, high-cycle duty so the battery lasts longer.
Critical power
Ride-through and bridging power for data centres, hospitals and process plants until generators start.
Planning a high-power project?
Tell us the power, duration and duty cycle you need, and we'll configure an UltraCap system for your site.