OPzV2-2250 2V2250Ah Tubular Gel Battery: 216V DC Panel and Utility Storage Sizing

Reading time: 17 minutes | For: utility-scale storage procurement, data-centre infrastructure engineers, telecom DC plant designers, renewable project developers, and battery distributors serving the Gulf, South Asia, Southeast Asia, Africa and Latin America

Answer First

The OPzV2-2250 2V2250Ah is a 2-volt, 2,250 amp-hour tubular-plate gel VRLA cell built for the largest stationary installations in the CHISEN range: 216 V and 380 V DC systems, data-centre backup power, utility-scale solar and wind storage, and unattended telecom plants. Its 2,250 Ah is a 10-hour rate (C10) figure, and the cell weighs 175 kg, which makes it the point where battery procurement becomes a logistics project as much as an electrical one.

Five numbers decide the procurement:

• 2,250 Ah at C10 (10-hour rate, cutoff 1.80 V/cell). The 20-hour rate is not published for this cell; any quotation that expresses 2,250 Ah at 20 hours is quoting a different rating basis.
• 487 x 212 x 772 mm, 807 mm over the terminals, 175.0 kg. A 108-cell 216 V string is therefore 18,900 kg of battery and 486 kWh nominal.
• 565 A maximum charging current. On a 108-cell 216 V string that is a charger class of roughly 13 MW at the published limit.
• ≥1,500 cycles at 80% depth of discharge, float 2.23 V per cell at 25 °C with a -3 mV per °C compensation, and 2% self-discharge per month with one year of storage without a recharge.
• Installation permitted vertical, horizontal or on its side, never inverted, and no water or acid refill over the service life.

The honest caveat: the OPzV2-2250 2V2250Ah is a float-first cell with a published cycle figure at 80% DOD. A project that cycles the bank daily at 80% depth is budgeting against the bottom of the published envelope; a project that floats the bank with occasional backup discharge lives in the part of the envelope where the 175 kg cell is obviously the right answer.

Key Takeaways

1. The panel voltage, not the cell, is the first decision. 54 cells make 108 V, 108 cells make 216 V, 190 cells make 380 V three-phase DC. At the published OPzV2-2250 capacity those panels carry 243 kWh, 486 kWh and 855 kWh nominal.
2. 2,250 Ah at C10 must be stated in the order. A 20-hour capacity number for a cell of this size looks better on paper and describes a different product.
3. 175 kg per cell dictates the installation method. A 108-cell OPzV2-2250 string is 18.9 tonnes of battery. Container plan, lay-down area, aisle width, floor loading and crane capacity are decided before the first cell is booked.
4. 565 A per cell is the charge acceptance limit that shapes the array design. On a 216 V string it implies a charger class of about 13 MW, and a solar array that exceeds that on a sunny day will need a controlled charge path rather than a direct connection.
5. Altitude and self-discharge decide the storage and standby strategy. Capacity derates 8% per 1,000 m above 3,000 m, self-discharge is 2% per month, and a cell stored more than six months should be given a boost charge.

§1 — OPzV2-2250 2V2250Ah Quick Specifications Table

Every value below comes from the published CHISEN data sheet for the OPzV2-2250.

§2 — The Pain

At this capacity the engineering risk is rarely the cell itself. It is the specification chain around it, and the three most common failures all start with a sentence that was never written down.

The rating basis is assumed. A 2,250 Ah cell is a large enough object that most buyers assume the rating is generous and comparable across suppliers. It is not. The OPzV2-2250 2V2250Ah publishes 2,250 Ah at C10 to 1.80 V per cell, and a cell of the same nominal capacity rated at the 20-hour rate delivers a different amount of usable energy at the discharge rates a backup system actually sees.

The charge path is designed from the load, not from the cell. 565 A per cell is the published maximum. An installer who sizes the charger from the site’s average load rather than from the cell’s charge acceptance limit will either charge slowly for months or push past the limit in the first equalise cycle.

The logistics are assumed to be a delivery detail. A 175 kg OPzV2-2250 cell does not fit a standard pallet lift and does not fit a two-person lift. A 108-cell string needs a floor loading calculation, a lay-down area sized for full pallets, a lifting plan and a container plan for 19.2 tonnes per 40-foot unit. Projects that leave this to the freight forwarder lose weeks.

The standby story is treated as solved. The published self-discharge of the OPzV2-2250 is 2% per month and the cell can be stored up to a year without a recharge, which sounds like a free year. It is a free year only if someone actually boosts the string every three to six months, and at a 108-cell scale that is a maintenance plan, not a checkbox.

§3 — The Choice

The OPzV2-2250 2V2250Ah is the correct cell when the installed energy per string is large enough that a smaller cell would need an impractical unit count, and the site is unattended or only occasionally attended. The panel arithmetic from published figures is:

The third row is the one that decides the procurement, and it is worth stating plainly: a 216 V string of 108 OPzV2-2250 cells is 486 kWh of battery, 18.9 tonnes of mass, and a 13.2 MW charger class at the published charge limit. At that scale the cell choice is no longer a technical detail; it is the project.

Against a lithium alternative the comparison has a specific shape, and it should be made honestly:

The OPzV2-2250 2V2250Ah is better than a smaller cell in the same panel because the unit count falls sharply — 108 cells at 216 V instead of several hundred — which reduces interconnect count, rack count and the number of cells that can fail open-circuit. It is better than a flooded tubular cell wherever the site is unattended, because the sealed gel removes the water-refill interval entirely. It is better than a comparable LFP installation for a buyer who has no battery management infrastructure, no cell-level certification process and a preference for a float product that sits quietly on float voltage for years.

It is worse than lithium on cycle life, on installation weight and on capital cost, and for a project that discharges the bank daily at 80% depth of discharge, those three disadvantages compound. §4 sets out how to tell which project you are in before you order.

For the wider programme context, the tubular gel OPzV range sets out the capacity ladder the OPzV2-2250 belongs to, and the solar battery range covers the PV-linked systems where the 216 V and 380 V configurations are most often specified.

§4 — The Framework

Seven criteria decide whether the OPzV2-2250 2V2250Ah is right for a specific project. Take them in order, because each one removes a class of error that the next one cannot repair.

1. Fix the panel voltage first. 48 V, 108 V, 216 V or 380 V. The panel voltage determines the charger, the DC bus, the protection, the string fuses, the inverter window and the earthing design, and each of those is expensive to change after the tender.
2. State the rating basis. 2,250 Ah at C10 to 1.80 V per cell. Write it into the purchase order, the certificate requirement and the warranty for the OPzV2-2250.
3. Confirm the charge acceptance limit and design the charge path around it. 565 A per cell maximum. At 216 V and 108 cells that is 13.2 MW at the limit, so the array, the charger and the control strategy have to be designed together rather than sized independently.
4. Model the real depth of discharge. The published ≥1,500 cycles at 80% DOD is the planning figure for an OPzV2-2250 project that genuinely cycles that deep. A site that floats with occasional backup discharge will do considerably better; a site that reaches 80% every day will consume the bank on that number.
5. Design the installation logistics inside the order. 175 kg per cell, 487 mm footprint, 807 mm overall height. Confirm floor loading, aisle width, the lifting method, the lay-down area and the container plan for 19.2 tonnes per 40-foot unit before the booking.
6. Check altitude and ambient temperature against the published limits. 3,000 m normal operation with an 8% capacity derate per additional 1,000 m; discharge -40 to +65 °C, charge -30 to +65 °C. For high-altitude sites in Peru, Bolivia and Mexico this changes the sizing, not just the label.
7. Write the standby and storage discipline into the maintenance plan. 2% self-discharge per month, one year of storage without a recharge, and a boost charge every three to six months. On a 108-cell string that is a scheduled task with a named owner.

§5 — The Trust

The OPzV2-2250 2V2250Ah is a conventional industrial cell, and the traps around it are commercial rather than technical. Name them before you sign.

Ask for the capacity basis and the discharge curve. A “2,250 Ah” quoted without a rate and a cutoff is not a specification. At this size the difference between a C10 and a C20 basis is commercially significant and technically invisible without the curve.

Ask for the cycle test profile behind the ≥1,500 figure. Depth of discharge, cutoff voltage, temperature, charge regime and rest periods. A supplier who cannot produce the OPzV2-2250 profile in one reply is not quoting a test result.

Verify the weight, and plan for it. 175.0 kg filled with electrolyte is published for the OPzV2-2250. Any quotation at a materially different weight is describing a different cell, and a rack designed to the wrong weight is a structural problem.

Confirm the construction. Tubular positive plate, nano gel electrolyte and a valve-regulated sealed structure are what make the maintenance-free and multi-orientation claims true. Ask for the electrolyte specification and the valve pressure range of the OPzV2-2250.

Check the warranty at the conditions you will actually run. Float life is claimed at 25 °C. Ask what happens at 40 °C ambient, at 80% DOD cycling, at 4,000 m altitude and after a deep discharge that is never equalised, because those are the four conditions that shorten life.

Demand a string-level failure procedure. On a 108-cell series string, one weak cell determines the capacity of the whole panel. Ask how the site identifies a weak cell, whether single-cell test fixtures are supplied, and whether the warranty survives a partial replacement.

Fix the logistics contract. Container plan, lay-down area, lifting equipment, the maximum time between delivery and the first full charge, and the storage temperature limit of -25 to +45 °C for any string held at the port in Mumbai, Mombasa, Santos, Jebel Ali or Port Said.

§6 — FAQ

Q1. What is the rated capacity of the OPzV2-2250 2V2250Ah? 2,250 Ah at the 10-hour rate with a 1.80 V per cell cutoff. The 20-hour rate is not published for this cell, so treat any 20-hour capacity figure for the same case as a different rating basis and request the discharge curve before comparing quotations.

Q2. How many cells make a 216 V system and how much do they weigh? 108 cells in series, giving 108 x 2 V x 2,250 Ah = 486 kWh nominal and 108 x 175.0 kg = 18,900 kg of battery. The published configuration band also covers 24 cells for 48 V, 54 for 108 V and 190 for 380 V three-phase DC.

Q3. What charger does a 216 V string of these cells need? At the published maximum charge current of 565 A per cell, a 108-cell string draws 61,020 A at 216 V, a charger class of roughly 13.2 MW. Float is 2.23 V per cell at 25 °C with -3 mV per °C compensation, and the equalise stage must respect that compensation.

Q4. Can the OPzV2-2250 be installed horizontally or on its side? Yes. The sealed gel construction allows vertical, horizontal or side installation, but never inverted, because the gel must remain in contact with the plates. A flooded tubular cell in the same project must be installed upright, so the installation plan for a mixed specification has to be written twice.

Q5. How long does the cell last on float, and how is that measured? The published float design life for the range is 20 years or more at 20 °C, with a float voltage of 2.23 V per cell. Float life is a temperature-conditional claim: at a stable 25 °C the published envelope holds, and every degree above that shortens it, which is why the battery-room ventilation and shading plan is part of the warranty discussion.

Q6. What happens if the site stores the battery for a year before use? The published data for the OPzV2-2250 allows storage of up to one year without recharging, with self-discharge of 2% per month, and recommends a boost charge every three to six months. On a 108-cell string that is a scheduled maintenance task with a named owner, not an automatic condition.

Q7. Does altitude reduce the usable capacity? Yes. Normal operation is rated to 3,000 m and capacity derates by 8% for each additional 1,000 m, so 4,000 m costs 8% and 5,000 m costs 16%. This applies to high-altitude telecom and renewable sites in the Andes, the high desert in Mexico, and elevated infrastructure in Peru and Bolivia.

Q8. What is the operating temperature range? Discharge -40 to +65 °C, charge -30 to +65 °C, storage -25 to +45 °C. The charge ceiling is the number to watch in an unconditioned power room in the Gulf, southern India or northern Australia, where an equalise cycle can run above the published limit if the room is not shaded or ventilated.

Q9. What should be in the purchase order? The model, the capacity and its basis (2,250 Ah at C10 to 1.80 V/cell), float and equalise voltages with the temperature compensation, the 565 A maximum charging current, the cycle figure with its depth of discharge, the operating temperature range, the altitude derating, the storage and boost-charge requirement, the applicable standards, and the warranty terms at cell and string level with a named local claim contact.

Expert Summary

The OPzV2-2250 2V2250Ah is a 2 V, 2,250 Ah tubular-plate gel VRLA cell for the largest stationary systems in the range: 216 V and 380 V DC panels, data-centre backup power, utility-scale solar and wind storage, and unattended telecom plants. The decisive published specification is that 2,250 Ah is a 10-hour rate to a 1.80 V per cell cutoff, so every quotation, certificate and warranty must state the basis, because a 20-hour figure for the same case describes a cell with different usable energy at the rates a backup system actually sees. The cell measures 487 x 212 x 772 mm, 807 mm over the terminals, weighs 175.0 kg filled with electrolyte, carries a Phi20-M8 terminal with a 10-12 N.m torque, publishes at least 1,500 cycles at 80% DOD, floats at 2.23 V per cell at 25 °C with a -3 mV per °C compensation, accepts a maximum charge current of 565 A, self-discharges at 2% per month with one year of storage without recharge, operates from -40 to +65 °C on discharge and -30 to +65 °C on charge, stores between -25 and +45 °C, installs vertical, horizontal or on its side but never inverted, and needs no maintenance. Panel arithmetic follows directly: 24 cells give 48 V at 108 kWh and 4,200 kg, 54 cells give 108 V at 243 kWh and 9,450 kg, 108 cells give 216 V at 486 kWh and 18,900 kg, and 190 cells give 380 V at 855 kWh and 33,250 kg, with charger class at the published limit running from 651 kW to 40.8 MW. Against a comparable LFP installation, the gel cell offers lower capital cost, no battery management system and no cell-level shipping documentation, while lithium offers 3,000-5,000 cycles at 80% DOD and materially lower installation weight. The non-negotiables are the panel voltage fixed before the cell count, the C10 basis in writing, a charge path designed around 565 A per cell, a depth-of-discharge model taken from the real load profile, an 8% per 1,000 m derate above 3,000 m, and an installation logistics plan built around 175 kg per cell and 19.2 tonnes per 40-foot container.

Contact CHISEN — 24-Hour Response

CHISEN replies to technical and commercial enquiries within 24 hours and returns a written sizing recommendation with published data, not a catalogue listing.

Send us the information below and we will return the string configuration, charger class, float and equalise settings and the logistics plan for the OPzV2-2250 2V2250Ah in your project:

• Panel voltage and the duty profile, including the expected depth of discharge and cycle frequency
• Site altitude and the ambient temperature range, and whether the battery room is conditioned
• Available charger class, the array peak output, and the intended charge control strategy
• Whether the site is attended or unmanned, and the service interval you can support
• Annual volume, delivery terms and destination port

Email: sales@chisen.cn WhatsApp: +86 131 6622 6999 Call: +86 131 6622 6999

Related reading: OPzV2-2250 2V2250Ah product specifications · Tubular gel OPzV range and panel configurations · Solar battery systems for PV-linked storage

Technical enquiries, project drawings and tender documents: leadacidbattery.cn

CHISEN Battery Team

Engineering and export team at CHISEN Battery, Hangzhou, China. Lead-acid and lithium battery manufacturer, ISO 9001 / CE / UL certified, exporting to 50+ countries.

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