Xiamen D.T. Multi Tech Co., Ltd. is one of the most reliable manufacturers and suppliers of eps box in China. With abundant experience, we warmly welcome you to wholesale cheap eps box from our factory. If you have any enquiry about cooperation, please feel free to email us.
Products Description
In modern hybrid energy storage and off-grid solar systems, achieving uninterrupted power flow requires reliable, fast, and intelligent system steering. The EPS Box (Emergency Power Supply Box) is a high-performance automatic transfer switch for solar inverters, engineered to manage seamless power switching between the main utility grid and inverter backup output.
EPS Box integrates two contactors, which provide power steering for users. It is compatible with single-phase and three-phase inverters. Together with inverter, EPS Box can achieve intelligent switch between on-grid connection and off-grid connection. It can simplify the operation and improve security
Key Benefits
Seamless Grid-to-EPS Transition (<0.5s): In the event of a grid outage, the EPS switch box automatically isolates the utility connection and shifts energy delivery to critical loads within less than 0.5 seconds, guaranteeing uninterruptible backup power.
Integrated Dual Contactor Design: Built-in dual contactors provide automated power steering without requiring extra relays or manual changeover switches. This streamlined layout reduces installer labor costs and eliminates potential wiring errors.
Versatile Single & Three Phase Compatibility: Available in both single-phase (X1 EPS Box) and three-phase (X3 EPS Box) configurations to meet diverse project scale demands.
Industrial-Grade Outdoor Reliability: Housed in an IP65 transfer switch box enclosure, the unit operates reliably in harsh conditions across a wide temperature range of -20°C to +60°C.
Products Description
| GRID | ||
| Max.AC input current | 63 A | 3 × 63 A |
| Rated AC voltage | 230 V | 3 / N / PE, 400 / 230 V |
| Rated AC frequency | 50 / 60 Hz | 50 / 60 Hz |
| EPS | ||
| Max.EPS input current | 32 A | 3 × 63 A |
| Rated EPS voltage | 230 V | 3 / N / PE, 400 / 230 V |
| Rated EPS frequency | 50 / 60 Hz | 50 / 60 Hz |
| LOAD | ||
| Rated output current, on grid mode | 63 A | 3 × 63 A |
| Rated output current, EPS mode | 32 A | 3 × 63 A |
| Rated grid voltage | 230 V | 3 / N / PE, 400 / 230 V |
| Rated grid frequency | 50 / 60 Hz | 50 / 60 Hz |
| GENERAL DATA | ||
| Operating temperature | -20~60°C | -20 ~ 60°C |
| Switch time | 0.5 s | 0.5 s |
| Dimension | 300 × 220 × 170 mm | 300 × 220 × 170 mm |
| Weight | 3.5 kg | 4.85 kg |
| Degree of protection | IP65 | IP65 |
High-Temperature Performance
The EPS Box is specifically engineered to handle harsh thermal environments without compromising system stability. Operating across a wide temperature window of -20°C to +60°C, the unit features an intelligent internal thermal management design.
To safeguard internal relays and maintain continuous power delivery during heat waves, the system utilizes active thermal logic:
Nominal Operation: Delivers full rated current up to 40°C ambient temperature.
Controlled Thermal Derating: Beyond 40°C, output current smoothly scales down to manage heat dissipation, adjusting to 80% capacity at 50°C.
This built-in thermal protection prevents nuisance trips during peak summer production hours while extending the operational lifespan of the internal contactors. For EPC contractors and system integrators deploying storage systems in desert or tropical environments, this thermal derating curve ensures predictable, continuous backup power steering without risking unexpected system shutdowns.
FAQ
Q: What is the exact switching speed, and will it cause sensitive electronic loads to reset during a power outage?
A: The unit features a switching speed of less than 0.5 seconds (<500 ms). This is ideal for standard home and light commercial backup (lights, refrigeration, HVAC, motor drives, and general power circuits).
Q: Does the EPS Box feature mechanical or electrical interlocking to prevent grid backfeeding?
A: Yes, safety is paramount. The internal dual-contactor arrangement is both electrically and mechanically interlocked. This physical isolation guarantees that the utility grid connection and the inverter's off-grid EPS output can never be engaged simultaneously.
Q: Is the enclosure rated for direct outdoor installation?
A: Yes, the EPS Box is housed in a heavy-duty IP65-rated weatherproof enclosure. It provides complete protection against dust ingress and low-pressure water jets from any direction.
Q: What certifications and compliance test reports do you provide for regional customs and grid clearance?
A: We supply full factory documentation including CE compliance, IEC 60947 series test reports for low-voltage switchgear, and ROHS compliance certification.
Q: How does this integrated box reduce installation costs?
A: Building an automatic transfer switch on-site requires sourcing separate contactors, interlocking timers, DIN rails, terminal blocks, and external enclosures, requiring 1.5–2 hours of skilled electrician labor. Our factory-prewired EPS Box is plug-and-play, reducing installation time to under 20 minutes while eliminating wiring error risks.
Hot Tags: eps box, eps box manufacturers, suppliers, factory