1stess 500kW 625kW 1000kW Modular Power Conversion System
The 1stess Monet series connects high-voltage battery systems to a 400 V AC interface through bidirectional power conversion. Available as 500kW, 625kW, or 1000kW PCS models, it is designed for commercial and industrial battery energy storage projects requiring modular power architecture, coordinated battery cluster control, and accessible communication interfaces.
Key Features
- Modular 125 kW power module architecture for flexible system scaling
- 580-1000 V DC operating range supporting high-voltage system design
- 625-950 V full-load range for rated-power planning
- Intelligent battery cluster management with coordinated distribution
- Real-time monitoring, fault early warning, and remote monitoring
- Multiple communication interfaces: RS485, CAN, and Ethernet
- IP21 indoor and IP55 outdoor enclosure options
- Intelligent air cooling with -25°C to +60°C operating range
Technical Specifications
| Specification |
Monet-500 |
Monet-625 |
Monet-1000 |
| Rated AC Power |
500 kW |
625 kW |
1000 kW |
| Maximum AC Power |
550 kW |
687.5 kW |
1100 kW |
| Maximum DC Current |
800 A |
1000 A |
1600 A |
| Rated AC Current |
720 A |
900 A |
1440 A |
Shared Parameters
| Power Module Architecture |
125 kW modules |
| DC Operating Voltage |
580-1000 V |
| Full-load DC Voltage |
625-950 V |
| Rated AC Voltage |
400 V AC, -15% to +10% |
| AC Connection |
3W+PE / 3W+N+PE |
| Rated AC Frequency |
50/60 Hz, +/-5 Hz |
| THDi |
<3% under linear load |
| Adjustable Power Factor |
-1 leading to +1 lagging |
| Communication |
RS485 / CAN / Ethernet |
| Enclosure Options |
IP21 indoor / IP55 outdoor |
| Cooling |
Intelligent air cooling |
| Ambient Temperature |
-25°C to +60°C; derating above 45°C |
| Altitude Reference |
3000 m; derating above 3000 m |
Frequently Asked Questions
Which PCS power rating fits my project?
Select 500 kW, 625 kW, or 1000 kW according to charge and discharge power requirements, AC connection limits, and battery system capability. PCS power is expressed in kW, while battery capacity is specified separately in kWh or MWh.
Does the full operating range support full rated power?
The DC operating range is 580-1000 V, while the full-load range is 625-950 V. Check your battery's minimum and maximum voltages against both ranges, as operation outside the full-load range may require power reduction.
How should I check BMS and EMS compatibility?
Review protocol documentation, register maps, device addressing, control modes, and protection logic with your BMS/EMS supplier. Physical interface matching is just the starting point for integration.
Can I order an outdoor version?
Yes, an IP55 outdoor configuration is available alongside the IP21 indoor version. Confirm the exact enclosure on your order and ensure site design accounts for ventilation, drainage, and environmental exposure.
Is off-grid or seamless backup operation included?
This series is designed for on-grid C&I energy storage. For island operation, black start, or defined transfer time requirements, request a configuration-specific technical review.
Product Images
Professional Support
1stess supports importers, procurement teams, and EPC contractors with engineering configuration, OEM/ODM discussions, and project coordination. Confirm technical documentation, protective packaging, export logistics, and support scope for your selected configuration before ordering.
For project quotations, provide required PCS rating, battery chemistry and voltage range, charge/discharge limits, AC network details, installation environment, BMS/EMS requirements, destination country, and delivery scope.
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