New Age Tech Guru --- Solar Junction Box and Solar Combiner Box (DCDB)

 

Part of a series in renewal energy technologies brought by  M/s Paavi Solar

 

Friends, today we will learn about a very small but one of the most important components of the Roof Top Solar PV System. Friends it may be noted that this blog is about Roof Top Solar PV System only.

These components are

    1.       Solar Panel Junction Box:-  These boxes are pre-installed on the back of a solar panel and collects the charge produced by the panel. These junction boxes have bi-pass diodes installed to protect the reverse current from Charge controllers flowing towards panels. These polycarbonate boxes are weatherproof and prevent the terminals from dust, moisture, etc. Nowadays high power producing panel should have sturdy junction boxes to cope up with the higher power. Some panels use switches instead of diodes as diodes are prone to producing some heat but are too expensive. Nowadays modern technology are evolving which provides features like optimizing, monitoring, and quick shutdown.

    2.      Solar Combiner with protection Box (Also called DC Distribution Box) – When multiple Solar Panels are connected in series for building up the required voltage and current in accordance with designing the systems for a matching inverter and charge controller, this is called an array(string). Multiple arrays(strings) are then combined in parallel to multiply the array(string) output through overcurrent fuses and Surge Protective Device (SPD) for each array and terminated on a combined bus. These Combiner boxes have circuit breakers of required capacity at input and output to segregate the arrays. These polycarbonate boxes are typically non- metallic and are dust and moisture proofing features. These combiner boxes are insulated as per mandate from MNRE and tested up to a voltage of 1000V.

-           G P BOSE