Answer First
The OPzV2-1500 2V1500Ah is a 2 V stationary tubular-plate gel cell rated 1500 Ah at C10 to a 1.80 V/cell cut-off at 20 °C. Every figure here comes from the published datasheet: float charge 2.23 V at 25 °C, equalise 2.35 V at 25 °C, temperature compensation −3 mV/°C/cell, a designed float life of 20+ years at 20 °C, a cell weight of 102 kg (225 lbs), an internal resistance of approximately 0.45 mΩ fully charged at 25 °C, and 3,000 Wh of nominal energy per cell (2 V × 1500 Ah).
On a 48 V DC bus the arithmetic belongs on paper before a specification is written: 24 × 2 V × 1500 Ah = 72 kWh, 24 × 102 kg = 2,448.0 kg of cells, 24 × 0.45 mΩ = 10.80 mΩ of string resistance, and 24 × 300 A = a 7,200 A charge ceiling. Forty-eight cells on a 96 V DC bus give 144 kWh, 4,896.0 kg, 21.60 mΩ and a 14,400 A charge ceiling.
The OPzV2-1500 2V1500Ah fits telecom power, renewable storage, substation and switchgear DC systems, railway signalling, and large uninterruptible power supply installations that want one long-lived block rather than many small ones. Where the bus is 48 V and the bank sits nearer 48 kWh than 72 kWh, the OPzV2-1000 2V1000Ah cell starts from a lighter string; the OPzV2-1500 2V1500Ah earns its place when the duty cycle, the footprint or the service interval justify the heavier bank. Published data sit on the OPzV2-1500 2V1500Ah product page, and the OPzV tubular gel range page shows how the OPzV2-1500 2V1500Ah sits against the 500 Ah to 2500 Ah options.
Key Takeaways
- The OPzV2-1500 2V1500Ah is a 2 V, 1500 Ah stationary tubular-plate gel cell with a C10 discharge current of 150 A (1500 Ah ÷ 10 h) and 3,000 Wh per cell.
- Published setpoints are 2.23 V float and 2.35 V equalise at 25 °C, with −3 mV/°C/cell compensation and a designed float life of 20+ years at 20 °C.
- A 24-cell string of OPzV2-1500 cells on a 48 V DC bus gives 72 kWh, 2,448.0 kg and 10.80 mΩ; a 48-cell string on a 96 V bus doubles every figure.
- The binding constraints on an OPzV2-1500 2V1500Ah bank are 102 kg of cell mass, 831 mm of cell height and a 300 A per cell charge ceiling.
- The OPzV gel range runs from 500 Ah to 2500 Ah, so a bank can be matched to the load instead of rounded up to the nearest catalogue size.
Capacity is the easy half of the decision. An OPzV2-1500 2V1500Ah cell at 0.45 mΩ carries little voltage drop under load, but it concentrates 300 A of charge acceptance and 102 kg of mass into one container, so the design moves from an electrical question into a mechanical and thermal one.
§1 — OPzV2-1500 2V1500Ah Quick Specifications Table
The table reproduces the published ratings for the OPzV2-1500 2V1500Ah. Capacity is stated at the C10 rate to a 1.80 V/cell cut-off at 20 °C, and internal resistance is quoted fully charged at 25 °C, the reference temperature used across the OPzV gel range.
| Parameter | Value | Source |
|---|
| Model | OPzV2-1500, tubular-plate gel stationary cell, 2 V 1500 Ah | Model page |
| Nominal voltage | 2 V | Datasheet |
| Nominal capacity | 1500 Ah at C10 to 1.80 V/cell at 20 °C | Datasheet |
| C10 discharge current | 150 A (1500 Ah ÷ 10 h) | Arithmetic |
| Dimensions (L × W × H) | 275 mm × 210 mm × 831 mm | Datasheet |
| Weight | 102 kg (225 lbs) | Datasheet |
| Internal resistance | approx. 0.45 mΩ (fully charged at 25 °C) | Datasheet |
| Max. charge current | 300 A | Datasheet |
| Max. discharge current (5 s) | 3,000 A | Datasheet |
| Short circuit current | 6,200 A | Datasheet |
| Float charge voltage | 2.23 V @ 25 °C | Datasheet |
| Equalise charge voltage | 2.35 V @ 25 °C | Datasheet |
| Temperature compensation | −3 mV/°C/cell | Datasheet |
| Designed float life | 20+ years at 20 °C | Datasheet |
| Self-discharge | approx. 2 % per month at 20 °C | Datasheet |
| Ambient — discharge | −40 °C to 65 °C | Datasheet |
| Ambient — charge | −30 °C to 65 °C | Datasheet |
| Ambient — storage | −25 °C to 45 °C | Datasheet |
| Terminal | Female Copper Insert M8, torque 10–12 N·m | Datasheet |
| Container material | SAN | Datasheet |
| Nominal energy per cell | 3,000 Wh (2 V × 1500 Ah) | Arithmetic |
| Mass energy density | 29.4 Wh/kg (3,000 Wh ÷ 102 kg) | Arithmetic |
The 20+ years at 20 °C float figure is a design statement, not a warranty, and it depends on the charging regime and the ambient temperature. The datasheet defines the acceptance procedure: float between 20 and 25 °C, discharge at 0.25 C_A, cut off at 1.75 V/cell, and treat end of life as no more than 60 % of nominal capacity. Under that procedure the OPzV2-1500 2V1500Ah has headroom, because the 0.45 mΩ internal resistance lets the bank accept recharge quickly and recover close to rated capacity between maintenance visits.
Weight and footprint deserve their own line in a specification. At 102 kg per cell, a 24-cell string is 2,448.0 kg before racks, busbars and enclosures, and the 831 mm height sets cabinet depth in a control room. The mass dictates floor loading, the lifting plan at site and the number of shipments required, while the self-discharge figure of approximately 2 % per month at 20 °C means a bank idle for six months still holds roughly 88 % of its charge.
Terminal details are small but unforgiving. The female M8 copper insert of the OPzV2-1500 2V1500Ah takes 10–12 N·m; under-torquing a 300 A connection heats the joint, and over-torquing cracks the insert. Both faults surface months later as a cell drifting out of balance, so the torque figure belongs in the site work instruction and not only in the purchase order.
§2 — The Pain
Catalogue capacity is quoted without the string context that makes it meaningful. A 1500 Ah cell sounds enormous until you see that it is a 2 V part needing twenty-four units for a 48 V system. Buyers compare a 3 kWh cell against a 48 V nominal pack without registering that the working numbers of an OPzV2-1500 2V1500Ah bank are 72 kWh, 2,448.0 kg and a 7,200 A charge ceiling. The comparison that matters is at bus level, including the 10.80 mΩ of string resistance that decides how the bank behaves under a step load.
Charge acceptance is the second trap. With a maximum charge current of 300 A per cell, an OPzV2-1500 2V1500Ah string accepts up to 7,200 A, and that is a thermal limit, often ignored when a charger specified for a smaller bank is reused after the bank grows. In a hot climate the charger limits the recharge window, and a bank that cannot take back what it delivered drifts in float and loses life whatever the cell quality.
Temperature compensation is the third. The published −3 mV/°C/cell coefficient only works if the charger senses battery temperature and applies the offset. A charger without a sensor, or with one in the wrong rack position, overcharges in winter and undercharges in summer. The solar and wind table gives the coefficient as a range of −3 to −5 mV/cell/°C, so the chosen value must match the plant rather than sit at a default.
Documentation arriving late is the fourth. Importers in Nigeria, Kenya, South Africa and Egypt routinely find at pre-shipment inspection that the certification file does not match the tender. Agreeing the certificate set at quotation stage closes the same tender without a scramble, and it is the difference between a shipment that clears and one that sits in a bonded warehouse at Durban, Lagos or Jebel Ali.
§3 — The Choice
The OPzV gel range covers five published capacities, each solving a different string-length problem. The table sets out published geometry, mass and electrical data so that quotations can be compared on measured values rather than marketing language.
| Model | Voltage | Capacity | Dimensions L×W×H (mm) | Weight | Internal resistance | Max. charge current | Source |
|---|
| OPzV2-500 | 2 V | 500 Ah | 166 × 206 × 506 | 36.3 kg (80.0 lbs) | 0.56 mΩ @ 25 °C | 100 A | Datasheet |
| OPzV2-700 | 2 V | 700 Ah | 254 × 210 × 506 | 51.0 kg (112.5 lbs) | 0.55 mΩ @ 25 °C | 140 A | Datasheet |
| OPzV2-1000 | 2 V | 1000 Ah | 233 × 210 × 681 | 73.2 kg (161.4 lbs) | 0.5 mΩ @ 25 °C | 200 A | Datasheet |
| OPzV2-1500 | 2 V | 1500 Ah | 275 × 210 × 831 | 102 kg (225 lbs) | 0.45 mΩ @ 25 °C | 300 A | Datasheet |
| OPzV2-2500 | 2 V | 2500 Ah | 487 × 212 × 807 | 181 kg (399 lbs) | 0.3 mΩ @ 25 °C | 500 A | Datasheet |
The same five cells scale differently once multiplied into a 24-cell string, which is where most of the commercial argument is settled.
| Model | 24 × weight | 24 × internal resistance | 24 × max charge current | Nominal energy | Source |
|---|
| OPzV2-500 | 24 × 36.3 kg = 871.2 kg | 24 × 0.56 mΩ = 13.44 mΩ | 24 × 100 A = 2,400 A | 2 V × 500 Ah = 1,000 Wh | Arithmetic |
| OPzV2-700 | 24 × 51.0 kg = 1,224.0 kg | 24 × 0.55 mΩ = 13.20 mΩ | 24 × 140 A = 3,360 A | 2 V × 700 Ah = 1,400 Wh | Arithmetic |
| OPzV2-1000 | 24 × 73.2 kg = 1,756.8 kg | 24 × 0.50 mΩ = 12.00 mΩ | 24 × 200 A = 4,800 A | 2 V × 1,000 Ah = 2,000 Wh | Arithmetic |
| OPzV2-1500 | 24 × 102 kg = 2,448.0 kg | 24 × 0.45 mΩ = 10.80 mΩ | 24 × 300 A = 7,200 A | 2 V × 1,500 Ah = 3,000 Wh | Arithmetic |
| OPzV2-2500 | 24 × 181 kg = 4,344.0 kg | 24 × 0.30 mΩ = 7.20 mΩ | 24 × 500 A = 12,000 A | 2 V × 2,500 Ah = 5,000 Wh | Arithmetic |
Read together, the tables make the trade-off concrete. The OPzV2-1500 2V1500Ah delivers the lowest string resistance of the mid-range options at 10.80 mΩ, keeps the count at 24 cells and therefore keeps interconnects and monitoring channels down, and reaches the range’s highest mass energy density at 29.4 Wh/kg (3,000 Wh ÷ 102 kg). It also asks more of the floor, of the lifting gear and of enclosure depth at 831 mm. Stepping down to the 1000 Ah cell cuts the string to 1,756.8 kg and each cell to 73.2 kg, a far easier crate to handle on a site in Pakistan or Bangladesh, at the cost of 48 kWh instead of 72 kWh on the same bus.
No option wins outright, and the selection rule is simple: choose the cell whose string mass the site can physically accept, then confirm the charge ceiling against the charger rather than the catalogue. Where space is tight and OPzV2-1500 2V1500Ah cells are craned into place, the taller format is a real consideration. Where the load is steady and the budget is measured per installed kilowatt-hour, the arithmetic usually favours the 1500 Ah cell, because fewer cells mean fewer connections and less floor area per unit of energy.
§4 — The Framework
Step one — fix the bus and the duty. Start from the DC bus voltage, then choose the cell count: 24 cells give 48 V and 48 cells give 96 V, both at a nominal 2 V per cell. Write the duty explicitly, because the same 72 kWh OPzV2-1500 2V1500Ah bank behaves very differently at a constant 0.1 C draw than at a telecom profile with short high-current peaks. The published final-voltage table sets the boundaries: above 1.0 C the cell may be discharged to 1.60 V per cell, while below 0.05 C the recommended floor is 1.90 V per cell.
Step two — confirm the setpoints and the compensation. The standard published setpoints are a 2.23 V float voltage at 25 °C and a 2.35 V equalise voltage at 25 °C. For solar or wind duty the datasheet prints a separate settings table, exactly this way: float voltage setting 2.27 ± 0.005 V per cell at 25 °C, regulation and equalise voltage 2.40 ± 0.01 V per cell at 25 °C, array reconnection voltage 2.23 ± 0.005 V per cell at 25 °C, low voltage alarm 1.95 ± 0.005 V per cell, low voltage disconnect 1.90 ± 0.005 V per cell, load reconnect voltage 2.09 ± 0.01 V per cell, and over voltage disconnect 2.47 ± 0.01 V per cell. These are two tables for two duties, not a contradiction: the standard setpoints describe a grid-backed float installation, the solar and wind table describes a renewable array.
Step three — apply the temperature rules. Standard compensation for the OPzV gel range is −3 mV per °C per cell, and the solar and wind table gives −3 to −5 mV/cell/°C. Set the charger from measured battery temperature, not from a room sensor, and re-check the offset at the extremes of the local range. Cells are published for discharge from −40 °C to 65 °C, charging from −30 °C to 65 °C and storage from −25 °C to 45 °C, but the 20+ years at 20 °C float life assumes a controlled environment.
Step four — plan logistics and site work. One hundred and two kilograms per cell means an OPzV2-1500 2V1500Ah is specified, packed and lifted as an engineered item. Confirm the rack design against the 275 mm × 210 mm × 831 mm footprint, check floor loading against the 2,448.0 kg string mass, and plan the M8 connections at 10–12 N·m with calibrated tooling. For export orders the packing plan decides whether a shipment breaks its vessel space booking: cells shipped from Ningbo or Shanghai to Rotterdam, Antwerp or Jebel Ali are usually crated, and crate size often sets the freight cost.
Step five — fix the documentation before the order. Ask for the cell datasheet, the type-test and conformity report, the safety data sheet, the certificate of origin, the transport approval documentation and the warranty conditions as one indexed pack. The manufacturing operation holds ISO 9001, ISO 14001 and GB/T 28001, and the OPzV2-1500 2V1500Ah cell is built to IEC 60896-21/22, DIN 40472, IEC 61427, YD/T 1360, BS 6290 part 4, UL 1989 and the Eurobat long-life guide. Naming those standards in the purchase order removes the most common cause of a delayed clearance.
Step six — record the acceptance test. The published method is float between 20 and 25 °C, discharge at 0.25 C_A, cut off at 1.75 V per cell, with end of life at 60 % of nominal capacity. For a 1500 Ah cell that is a 375 A discharge current (1500 Ah × 0.25), and for a 24-cell string, 9,000 A of load for the test period. Put the test method into the site acceptance plan before the cells arrive, so the measurement taken on day one stays comparable with the figure quoted in year fifteen.
§5 — The Trust
The durability claim for the OPzV2-1500 2V1500Ah rests on tubular plate construction rather than on a marketing label. Tubular plates deliver more usable capacity from the same footprint, tolerate deep discharge without the plate distortion that shortens service life, and hold the 20+ years at 20 °C float design figure when the charging regime is respected. The gel electrolyte fixes the electrolyte in place, removing the stratification and spillage risk that makes open-acid cells awkward inside a switchgear room in Mexico or Chile, and suiting installations with limited ventilation and access.
The published test procedure converts that claim into evidence. A buyer who requests the capacity report for a production batch and repeats the 0.25 C_A discharge to a 1.75 V per cell cut-off at site holds an objective reference point for the whole twenty-year life. That is why the test method belongs in the contract: without it, capacity claims at delivery and at year ten cannot be compared, and every warranty discussion becomes an argument about test conditions rather than about the cells.
The compliance framework matters just as much The compliance framework matters just as much for import markets. The OPzV2-1500 2V1500Ah is built to IEC 60896-21/22 for stationary valve-regulated cells, DIN 40472, IEC 61427 for industrial valve-regulated batteries, YD/T 1360, BS 6290 part 4, UL 1989 and the Eurobat long-life guide, while the manufacturing operation is certified to ISO 9001, ISO 14001 and GB/T 28001. Tender documents in India, Brazil, Indonesia, Vietnam, Saudi Arabia, Turkey, Poland, Germany and the United Kingdom routinely specify these standards by number, so the request for them should be made at quotation stage rather than after the contract is signed.
Transport and storage discipline complete the trust argument. The cells ship as a non-spillable stationary battery line, but the 2 % per month self-discharge at 20 °C still sets a practical limit: a bank stored over a monsoon season in Chennai or a summer in Egypt loses charge slowly and must be recharged before commissioning. Cells are published for storage from −25 °C to 45 °C and should be kept out of direct sunlight on the pallet, with the terminals protected. A documented storage and commissioning procedure protects the float-life clock and costs nothing to specify.
§6 — FAQ
Q1. What are the published charge voltages for the OPzV2-1500 2V1500Ah? The datasheet gives a float charge voltage of 2.23 V at 25 °C and an equalise charge voltage of 2.35 V at 25 °C, with temperature compensation of −3 mV/°C/cell. For renewable installations the separate solar and wind table prints a float voltage setting of 2.27 ± 0.005 V per cell at 25 °C and a regulation and equalise voltage of 2.40 ± 0.01 V per cell at 25 °C. Both tables appear in the published datasheet and describe different charge regimes, so the charger configuration must match the duty.
Q2. How many cells are needed for a 48 V DC bus and what does the string weigh? Twenty-four cells in series give a 48 V nominal bus. With the OPzV2-1500 2V1500Ah the string delivers 24 × 2 V × 1500 Ah = 72 kWh, weighs 24 × 102 kg = 2,448.0 kg, presents 24 × 0.45 mΩ = 10.80 mΩ and accepts up to 24 × 300 A = 7,200 A of charge current. For a 96 V bus, 48 cells give 144 kWh and 4,896.0 kg.
Q3. Is the 20+ year float life figure guaranteed? It is a design figure published at 20 °C. The datasheet acceptance procedure floats the bank between 20 and 25 °C, discharges it at 0.25 C_A and cuts off at 1.75 V per cell, with end of life defined at 60 % of nominal capacity. Real service life depends on ambient temperature, the charging regime and the frequency of equalisation, which is why the warranty conditions should be requested with the quotation.
Q4. What is the maximum charge current, and can OPzV2-1500 cells be used in parallel? The maximum charge current for one OPzV2-1500 2V1500Ah cell is 300 A, so a 24-cell string accepts 7,200 A. Cells of equal capacity, age and type can be paralleled to raise bank capacity, but each parallel branch needs its own fusing, and the string resistance of 10.80 mΩ on a 24-cell arrangement must be included in any load-step study.
Q5. How does the OPzV2-1500 compare with a smaller cell in the same range? Against the 1000 Ah cell, the OPzV2-1500 raises the 24-cell string from 48 kWh to 72 kWh and drops the string resistance from 12.00 mΩ to 10.80 mΩ, while the cell mass rises from 73.2 kg to 102 kg and the height from 681 mm to 831 mm. Against the 500 Ah cell the same bus carries 72 kWh instead of 24 kWh, at 2,448.0 kg instead of 871.2 kg.
Q6. What should a buyer request before ordering? Request the cell datasheet, the type-test or conformity report, the safety data sheet, the certificate of origin, the transport approval documentation and the warranty conditions as one indexed pack, and confirm that the certification set matches the standards named in the tender. Specify the acceptance test method at the same time so that site measurement is comparable with the published figures.
Expert Summary
The OPzV2-1500 2V1500Ah is a 2 V, 1500 Ah tubular-plate gel stationary cell with published figures that support a long service life: float 2.23 V and equalise 2.35 V at 25 °C, −3 mV/°C/cell temperature compensation, a designed float life of 20+ years at 20 °C, 102 kg per cell, 0.45 mΩ internal resistance, 3,000 Wh per cell and 29.4 Wh/kg of mass energy density. On a 48 V DC bus the bank is 24 cells, 72 kWh, 2,448.0 kg, 10.80 mΩ and a 7,200 A charge ceiling; on a 96 V bus it is 144 kWh and 4,896.0 kg.
The selection logic is mechanical before it is electrical. Confirm that the site can accept 102 kg cells at 275 mm × 210 mm × 831 mm, that the charger can deliver 300 A per cell at the chosen setpoint, and that the temperature compensation is applied from a battery-mounted sensor. Where the duty is a renewable array, use the printed solar and wind table, including the 2.27 ± 0.005 V per cell float setting and the 2.40 ± 0.01 V per cell regulation voltage. Where the duty is a grid-backed float installation, use the standard 2.23 V and 2.35 V setpoints with −3 mV/°C/cell compensation.
Then record the acceptance test in the contract rather than in a handover note. A 0.25 C_A discharge to a 1.75 V per cell cut-off between 20 and 25 °C, with end of life at 60 % of nominal capacity, is the reference against which the 20+ years at 20 °C design life is measured. Ask for the conformity report, the safety data sheet, the certificate of origin and the transport approval documentation at quotation stage, and confirm that the certification set matches IEC 60896-21/22, DIN 40472, IEC 61427, YD/T 1360, BS 6290 part 4, UL 1989 and the Eurobat long-life guide named in the tender. That is how a 102 kg cell earns a place in a cabinet and stays there for two decades.
Contact CHISEN — 24-Hour Response
Send the following and CHISEN will respond within 24 hours with a quotation, the datasheet and the certification pack:
- Application — telecom, solar and wind storage, substation DC, railway signalling, or UPS
- DC bus voltage and required string configuration, for example 24 cells at 48 V
- Required capacity in Ah or kWh, and the expected discharge duty
- Quantity of OPzV2-1500 2V1500Ah cells, plus racks, enclosures and interconnects
- Destination port and country, for example Jebel Ali, Rotterdam, Santos or Colombo
- Documentation needs — datasheet, conformity report, safety data sheet, certificate of origin and transport approval
- Target delivery date and any certification list required by the tender
Full product information is available on leadacidbattery.cn, and the CHISEN export desk handles technical sizing, documentation and shipping coordination from Hangzhou.
Sales enquiries: sales@chisen.cn — technical drawings, datasheets and quotations are issued from the same address.
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