How to choose the capacity of the DC panel according to the demand?

Calculate the load current: Count the total current of all DC loads (such as control circuits, protection devices, indicator lights, etc.).

 Determine the backup time: According to the requirements of the power system, the backup time is usually 1-2 hours (longer for important occasions).

 Calculate the battery capacity: The formula is "Battery capacity (Ah) = load current (A) × backup time (h) ÷ discharge depth (usually 0.7)".

 Rectifier module capacity: It must meet the load current + battery charging current (usually 10% of the battery capacity), and reserve redundancy (such as N+1 configuration).

How to choose 110V and 220V DC panels?

 110V system: suitable for medium and low voltage distribution systems (such as 10kV, 35kV substations), with small load current and relatively low cable loss.

220V system: suitable for high voltage systems (such as 110kV and above substations) or large capacity loads (such as circuit breaker spring operating mechanisms), which can reduce the cable cross-sectional area.

When selecting, it is necessary to match the rated voltage of the load equipment (such as circuit breaker operating mechanisms are usually marked 110V DC or 220V DC).