Array Junction Box (AJB) is meant for combining all the incoming lines from the solar panel strings/arrays and deriving one common array output for the multiple array inputs.
A Main Junction Box (MJB) is used to combine the multiple outputs from multiple numbers of Array Junction Boxes in the Power Plant and form a single output that can be connected directly to the DC Distribution Board (DCDB) or Power Conditioning Unit (Solar Inverter).
The DC Distribution Box is used to provide flexibility for the operator of the solar power plant to disconnect and connect both the inward solar supply and battery terminals. Here an MCCB and a fuse of proper rating depending upon the capacity of the power plant and the battery bank are used.
The ACDB box is made of epoxy powder coated metal casting. Three feeders are provided in ACDB with MCB of Required capacity installed at each feeder in the ACDB.One Electronic Energy Meter, ISI make, is provided in ACDB to measure the consumption of power from SPV Power Plant. A separate dedicated feeder from conventional line to PCU as well as ACDB is also provided. A separate change over switch of required capacity is provided in the ACDB to isolate the existing connected load from the solar system & switch it over to the existing convention power (Mains), in case of emergency.