Q: How should the DC output conductor cross-section be calculated for a single DZY-4850HI (50A) to limit voltage drop to <0.5V?

Using the loop formula S = (2 * L * I) / (γ * ΔU), where γ is copper conductivity (57 m/(Ω·mm²)), ΔU is 0.5V, and current I is 50A: S ≈ 3.51 * L (where L is one-way cable length in meters). For a 4-meter one-way run, minimum calculated cross-section is 14.04 mm², dictating a standard 16 mm² 105°C rated flame-retardant copper conductor. If the distance exceeds 7 meters, use 25 mm² to stay within thermal and loop resistance limits.

Q: What are the recommended voltage thresholds and delay parameters for LLVD and BLVD in a 48V VRLA battery configuration?

For a standard 24-cell (2V/cell) VRLA string, Load Low Voltage Disconnect (LLVD) is typically configured at 44.0V to 44.4V (~1.83V–1.85V/cell) with a 60-second delay to shed non-critical loads. Battery Low Voltage Disconnect (BLVD) must be set at 43.2V (~1.80V/cell) with a 10-30 second debounce delay, fully disconnecting the battery string to avoid permanent plate sulphation and cell reversal.

Q: How does the DZY-4850HI temperature compensation mechanism calculate and adjust the float charge voltage?

The system references 25°C with a nominal 48V float voltage of 53.5V (2.23V/cell). Using a typical slope of -3mV/°C/cell (-72mV/°C for a 24-cell string), the formula is: V_float = 53.5V + [(25 - T_battery) * 0.072V]. At 35°C, float voltage drops to 52.78V to prevent thermal runaway; at 10°C, it increases to 54.58V to ensure complete chemical saturation. Firmware clamps clamp voltages between 51.0V and 56.5V for safety.

Question 1

How should the DC output conductor cross-section be calculated for a single DZY-4850HI (50A) to limit voltage drop to <0.5V?

Accepted Answer

Using the loop formula S = (2 * L * I) / (γ * ΔU), where γ is copper conductivity (57 m/(Ω·mm²)), ΔU is 0.5V, and current I is 50A: S ≈ 3.51 * L (where L is one-way cable length in meters). For a 4-meter one-way run, minimum calculated cross-section is 14.04 mm², dictating a standard 16 mm² 105°C rated flame-retardant copper conductor. If the distance exceeds 7 meters, use 25 mm² to stay within thermal and loop resistance limits.

Question 2

What are the recommended voltage thresholds and delay parameters for LLVD and BLVD in a 48V VRLA battery configuration?

Accepted Answer

For a standard 24-cell (2V/cell) VRLA string, Load Low Voltage Disconnect (LLVD) is typically configured at 44.0V to 44.4V (~1.83V–1.85V/cell) with a 60-second delay to shed non-critical loads. Battery Low Voltage Disconnect (BLVD) must be set at 43.2V (~1.80V/cell) with a 10-30 second debounce delay, fully disconnecting the battery string to avoid permanent plate sulphation and cell reversal.

Question 3

How does the DZY-4850HI temperature compensation mechanism calculate and adjust the float charge voltage?

Accepted Answer

The system references 25°C with a nominal 48V float voltage of 53.5V (2.23V/cell). Using a typical slope of -3mV/°C/cell (-72mV/°C for a 24-cell string), the formula is: V_float = 53.5V + [(25 - T_battery) * 0.072V]. At 35°C, float voltage drops to 52.78V to prevent thermal runaway; at 10°C, it increases to 54.58V to ensure complete chemical saturation. Firmware clamps clamp voltages between 51.0V and 56.5V for safety.

Key specifications	Value
AC Input Voltage	85VAC ~ 300VAC (Nominal 220VAC) VAC
Smart Monitoring Controller	RS485 / CAN Industrial Bus Communication
Cooling System Architecture	Built-in smart brushless DC fan cooling
Nominal Output Voltage	-48VDC (-42V ~ -58V) VDC
Managed Rectifier Capacity	High Power Density Hot-Swap Module
Rated DC Output Current	50A (Full Load Power 2900W)
Form Factor Dimensions (HxWxD)	88 × 108 × 328 mm
Peak Energy Efficiency	≥96.5%
Operating Temperature Range	-40°C ~ +75°C (Non-derating up to 55°C)

DPC DZY-4850HI High-Efficiency Telecom Switch-Mode Rectifier Module (-48V 50A 2900W)

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What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

Cellular BTS/NodeB/eNodeB -48V DC power distribution

Optical transport networking and long-haul microwave repeater sites

Railway signaling and electrical substation SCADA back-up power

Edge computing shelters and telecom-grade server racks

Frequently asked questions

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DPC DZY-4850HI High-Efficiency Telecom Switch-Mode Rectifier Module (-48V 50A 2900W)

Talk to RICEWIND

Clear support from selection to delivery

What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

Cellular BTS/NodeB/eNodeB -48V DC power distribution

Optical transport networking and long-haul microwave repeater sites

Railway signaling and electrical substation SCADA back-up power

Edge computing shelters and telecom-grade server racks

Frequently asked questions

How should the DC output conductor cross-section be calculated for a single DZY-4850HI (50A) to limit voltage drop to <0.5V?

What are the recommended voltage thresholds and delay parameters for LLVD and BLVD in a 48V VRLA battery configuration?

How does the DZY-4850HI temperature compensation mechanism calculate and adjust the float charge voltage?

What load-sharing architecture is utilized during parallel operation of multiple DZY-4850HI rectifiers, and how is current-sharing imbalance diagnosed on-site?

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