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Beijing Signal Screen Factory Price, Beijing Signal Screen Factory Suppliers, Beijing Signal Screen Factory Phone Number 1. The 220V and 110V DC systems should use battery banks. For DC systems of 48V or below, battery banks or DC/DC converters powered by 220V or 110V battery banks can be used. 2. For auxiliary workshops with long power supply distances that require DC power, it is advisable to have an independent DC system. 3. Battery banks should normally operate in float charging mode. 4. Lead-acid battery banks should not have terminal batteries; nickel-cadmium battery banks should reduce the number of terminal batteries. 5. Nominal Voltage of DC Systems (1) DC systems controlling load should use 110V. (2) DC systems for power load should use 220V. (3) DC systems supplying both control and power loads should use 220V. 6. Charging Equipment (1) Should meet the charging and float charging requirements of the battery bank. (2) Should be for long-term continuous operation. (3) The charging equipment should have voltage regulation, current regulation, and current limiting capabilities. (4) Should have automatic and manual float charging, equalizing charging, and current regulation charging functions. (5) The AC power input for charging equipment should ideally be three-phase, with a rated frequency of 50Hz and a rated voltage of 380(1±10%)V. For small capacity charging equipment, the AC power input voltage can be single-phase 220(1±10%)V. (6) For one set of battery banks, one charging equipment should be configured for the DC system. The AC power for the charging equipment should ideally have two circuits; one in operation and the other in standby. In case of a fault in the working power source, it should automatically switch to the standby power source.