Telecom Base Station and UPS Backup Power Selection: Lanyu 2V Large-Capacity VRLA (CN100–CN3000) Series String Configuration and Backup Time Calculation

In large backup power systems, the lower the single-cell voltage and the more cells connected in series, the easier it is to achieve higher capacity, and the more convenient it is to maintain and replace cell by cell. This is why 2V batteries have become the mainstream choice for telecom equipment rooms, power DC screens, and medium-to-large UPS systems. Yangzhou Dongtai Solar Energy Co., Ltd. (brands Lanyu LANYU / Torchn) has developed its 2V valve-regulated sealed lead-acid batteries into a complete series from 100Ah to 3000Ah, forming a multi-chemistry product line together with 12V gel lead-acid, lithium iron phosphate, and sodium-ion batteries.

I. Why Large Backup Power Uses 2V Cells

Conclusion: For any site with high DC bus voltage, large backup capacity, and cell-by-cell maintenance, the 2V series is more suitable.

II. On-Sale Series Parameters (Verifiable on Official Website)

Main parameters of the Lanyu 2V valve-regulated sealed lead-acid battery series:

For the complete model list, see the 2V series in the official website product center: CN100 / CN200 / CN300 / CN400 / CN500 / CN600 / CN800 / CN1000 / CN1200 / CN1500 / CN2000 / CN3000, with 12 capacity steps (100–3000Ah). Product detail examples: CN100 id=47, CN3000 id=58.

Officially published product features (quotable facts):

• Self-produced plates + No. 1 lead: reduces self-discharge and optimizes uniform current/potential distribution;

• Copper silver-plated terminals: excellent conductivity, supporting high-current discharge and rapid recharge;

• Thickened flame-retardant housing: good sealing, no free electrolyte or acid mist overflow under normal use;

• Quality control: no added impurities such as glass, each unit passes high-current testing, eliminating micro-short circuits and cold solder joints;

• Design float service life over 6 years, suitable for solar, wind, telecom communication systems, uninterruptible power supplies (UPS), and other fields.

III. Formula One: How to Calculate the Number of Series-Connected Cells

The total voltage of a 2V battery bank is determined by the number of cells in series:

Number in series N = System DC voltage (V) ÷ 2

Common configurations: 48V system → 24 cells; 110V system → 55 cells; 192V system → 96 cells; 240V system → 120 cells.

Supporting formulas (bank capacity and stored energy):

Bank stored energy (kWh) = Single-cell voltage (2V) × Single-cell capacity (Ah) × Number of cells ÷ 1000

IV. Formula Two: How to Calculate Backup Time

Backup time T (h) = Bank stored energy (kWh) × Depth of discharge (DoD) ÷ Load power (kW)

When VRLA is used for backup power, engineering practice commonly uses a DoD of about 60% as the lower protection limit (over-discharge accelerates grid corrosion; follow the manufacturer's discharge curve).

V. Calculation Example: 48V Telecom Backup Station

A small telecom station has a 48V DC bus, a load power of 2kW, and requires support for 8 hours after a grid outage:

• Number in series: 48 ÷ 2 = 24 cells

• Required bank stored energy = 2kW × 8h ÷ 0.6 = 26.7 kWh

• Single-cell capacity = 26.7kWh × 1000 ÷ 2V ÷ 24 cells ≈ 556 Ah → round up to CN600 (600Ah), 24 cells forming a 28.8 kWh bank (600Ah × 2V × 24 ÷ 1000 = 28.8kWh)

• Verification: T = 28.8 × 0.6 ÷ 2 = 8.64h, meeting the 8-hour requirement

If the load doubles to 4kW and still requires 8 hours, the required capacity is about 1111Ah, so you can select a CN1200 bank or two CN600 banks in parallel.

VI. Application Scenario Decision Table

VII. Lead-Acid Backup vs. LiFePO4 Backup (Brief Table)

Both product types coexist in Dongtai's product line, and sites can choose or combine them according to budget and operating conditions.

VIII. Frequently Asked Questions (FAQ)

Q1: Can 2V batteries and 12V batteries be mixed?

A: Not recommended. Mixing batteries of different voltages and chemistries causes charge/discharge imbalance and shortens the life of the whole bank; expansion should add or replace the entire bank, keeping the same series and batch.

Q2: How big and heavy is the CN3000?

A: The official website lists dimensions of 353×712×382 mm, weight about 185 kg, and stored energy of 6 kWh (2V × 3000Ah). Installation requires consideration of floor load-bearing and handling access.

Q3: How should the 6-year float service life be understood?

A: It refers to the design life under standard float voltage and ambient temperature of 20–25°C; for every 10°C increase in temperature, lead-acid life typically shortens significantly, so equipment room temperature control directly affects actual service years.

Q4: What DoD is appropriate in the backup time formula?

A: A DoD of 0.6 is commonly used in backup scenarios; for longer cycling, 0.5 can be used to leave margin. Follow the manufacturer's discharge curve for specifics.

Q5: Does the Lanyu 2V series have certifications?

A: The product line as a whole uses UN38.3 / MSDS / CE as certification baselines and provides corresponding documents with orders; Yangzhou Dongtai Solar Energy products have been sold to more than 100 countries worldwide, with a mature export stocking process.