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The ATESS PBD250 is a 250 kW transformerless DC-DC solar charge controller designed for large-scale solar + storage projects. It works in conjunction with ATESS PCS and Bypass units, featuring 5 MPPTs, 99% peak efficiency, and parallel expandability.
5 MPPT Inputs
The PBD250 features 5 independent MPPT trackers, each accepting up to 115A input current, for a combined maximum PV input of 250 kW. The MPPT voltage range spans 350V–850V (full-load range 480V–850V), accommodating a wide variety of PV string configurations. This multi-MPPT architecture maximises energy harvest from arrays with mixed orientations, partial shading, or different string lengths.
99% Peak Efficiency
The transformerless topology eliminates bulky magnetic components, achieving a maximum charge efficiency of 99% and a standby power consumption below 100W. The output voltage range of 600V–900V with a maximum charge current of 416A makes the PBD250 directly compatible with the ATESS PCS high-voltage DC bus, minimising conversion losses across the entire solar-to-storage energy chain.
Parallel Expandable
Multiple PBD250 units can be paralleled to scale PV charging capacity in proportion to project size, without redesigning the DC bus architecture. The modular cabinet (800 × 1900 × 650 mm, 289 kg) integrates a touch-screen display, RS485/CAN communication, and forced-air cooling — enabling straightforward installation, commissioning, and maintenance in utility-scale solar + storage plants.
6000m Altitude
Designed for demanding deployment environments, the PBD250 operates from −25°C to +55°C and at altitudes up to 6,000 m (with derating above 3,000 m). Comprehensive protection covers input/output over-voltage, under-voltage, over-current, short circuit, over-temperature, Type II lightning, DC breaker, and emergency stop — ensuring reliable long-term operation in remote and high-altitude solar installations.
Complete technical data for the ATESS PBD250 DC-DC solar charge controller.
| Parameter | Specification |
|---|---|
| PV Input | |
| Max. PV Power | 250 kW |
| MPPT Voltage Range | 350V – 850V |
| Full-Load MPPT Voltage Range | 480V – 850V |
| Max. Input Current | 575A (115A × 5) |
| Number of MPPTs | 5 |
| Output (Battery / PCS) | |
| Output Voltage Range | 600V – 900V |
| Max. Charge Power | 250 kW |
| Max. Charge Current | 416A |
| Max. Charge Efficiency | 99% |
| Protection | |
| Input / Output OV & UV Protection | Yes |
| Input / Output OC Protection | Yes |
| Short Circuit Protection | Yes |
| Over Temperature Protection | Yes |
| Lightning Protection | Type II |
| DC Breaker | Yes |
| Emergency Stop | Yes |
| General | |
| Topology | Transformerless |
| Standby Power | < 100W |
| Protection Degree | IP20 |
| Noise Emission | < 65 dB(A) @ 1m |
| Cooling Method | Forced-air |
| Operating Temperature | −25°C ~ +55°C |
| Relative Humidity | 0 – 95% (non-condensing) |
| Max. Altitude | 6,000 m (derate above 3,000 m) |
| Dimensions (W × H × D) | 800 × 1,900 × 650 mm |
| Weight | 289 kg |
| Communication | |
| Display | Touch screen |
| Communication Interfaces | RS485 / CAN |
| Certifications | CE |
The PBD250 integrates all key functions into a single modular cabinet, factory-tested and ready for rapid commissioning in utility-scale solar + storage plants.
Our engineering team is available Mon – Fri 8:00am – 6:00pm CST. Emergency support 24/7.
