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The DC Distribution Box is used to provide flexibility for the operator of thesolar 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.In the DCDB we have two sections one is the solar section and theother is the battery section.
Solar Section/ Battery Section
In solar section the incoming terminals from the MJB are fed to the input connectors and the conduction path takes place through the MCB and a HRC Fuse of proper rating selected as per the system capacity and the panel used in the power plant. The same is done for the incoming terminals from the battery bank.
Monitoring Section of DCDB
The DCDB is provided with a digital Ampere Hour meter to observe thecharging/discharging currents of the battery i.e. Ah of the Battery.
This meter is intended to work only on the AC external supply from the ACDB feeder.
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.