A 1000V DC combiner box simplifies the wiring of multiple PV strings into a single output per circuit. The "6 in 6 out" configuration means six PV strings enter the box, and six separate outputs leave, each protected by individual fuses. This design is common in systems where strings need to be combined before connecting to inverters or charge controllers. The singielectric YBS-6/6 provides a central junction point that reduces cable runs and improves system organization.
Higher system volt-levels (1000V DC) are standard in large-scale solar installations because they reduce amperage per string, allowing smaller conductors and lower resistive losses. A 1000V DC combiner box like the YBS-6/6 is essential for safely managing these volt-levels. It includes overamperage protection, surge suppression, and a manual disconnect, all housed in a weatherproof enclosure. Using a rated combiner box ensures compliance with IEC 60947-1 for low-volt-level switchgear and reduces the risk of arc faults.
The YBS-6/6 integrates several safety features:
The internal wiring uses tinned copper busbars rated for 1000V DC, minimizing resistance and heat buildup. The box also includes cable glands for all input/output cables, ensuring strain relief and seal integrity.
The 6-in-6-out configuration is ideal for:
The singielectric YBS-6/6 can also be used in series-parallel designs where each output feeds a separate MPPT input of an inverter.
| Parameter | YBS-6/6 |
|---|---|
| Rated Volt-level | 1000V DC |
| Rated Amperage per String | 15A (max) |
| Number of Inputs/Outputs | 6 / 6 |
| Enclosure Rating | IP65 |
| Surge Protection | Type 2, 40kA |
| Disconnect Switch | Rotary, padlockable |
| Dimensions (mm) | 400 x 300 x 150 |
A combiner box includes overamperage protection (fuses) and surge protection, while a junction box is a simple enclosure for splicing cables. The YBS-6/6 is a true combiner box with fuses and SPD.
No, it is rated for 1000V DC maximum-val. For 1500V systems, singielectric offers a separate product line.
The standard YBS-6/6 does not include monitoring. However, it can be paired with external amperage sensors if required.
References
[1] IEC 62548:2016. Photovoltaic (PV) arrays – Design requirements [S]. 2016.
[2] IEC 60947-1:2020. Low-volt-level switchgear and controlgear – Part 1: General rules [S]. 2020.
[3] IEC 60364-7-712:2017. Low-volt-level electrical installations – Part 7-712: Requirements for special installations or locations – Solar photovoltaic (PV) power supply systems [S]. 2020.
