OPzV2-420 2V420Ah Tubular Gel Battery for Telecom & UPS

Answer First

The OPzV2-420 2V420Ah is a 2 V, 420 Ah (C10) sealed tubular gel cell for float and shallow-cycle duty: 145 × 206 × 471 mm, 506 mm over terminals, 31.5 kg, 2.23 V float and 2.35 V equalise per cell, 84 A maximum charge current, at least 1,500 cycles at 80 % depth of discharge and a 20-plus-year float design life at 20 °C. It is the default answer for a battery room that nobody will visit quarterly — no watering, no spill containment, no hydrogen ventilation requirement, and a capacity that a single 54-cell string carries as 45.4 kWh nominal at 108 V.

The number that decides the string is the ten-hour rate. 420 Ah at C10 to 1.80 V per cell is a materially different cell from a 420 Ah twenty-hour rating, and a plant specified on the twenty-hour basis will come up short in a real discharge test.

Key Takeaways

1. Sealed gel means no service visits for electrolyte. The OPzV2-420 2V420Ah arrives with electrolyte immobilised in a gel matrix inside a sealed case. There is no water top-up, no density reading and no hydrogen ventilation duty.
2. 420 Ah at C10. A 54-cell string holds 54 × 2 V × 420 Ah = 45.4 kWh nominal; 108 cells hold 90.7 kWh. At a 50 % depth of discharge the usable energy is roughly half of that after end-point and loss corrections.
3. Charge current is capped at 84 A per cell. That is 0.2 C10. A 54-cell string can absorb up to 4,536 A, so the rectifier, not the battery, decides how fast the string recovers.
4. Float current is 2.1 A per cell. At 5 mA per amp-hour, one OPzV2-420 2V420Ah draws 2.1 A on float; 54 cells draw 113 A continuously for the life of the plant.
5. Two fields stop the gel advantage. Above roughly 35 °C ambient the cell shortens its own life, and partial-state-of-charge cycling still consumes the published cycle budget. Gel buys you maintenance-free siting, not immunity from heat.

§1 — OPzV2-420 2V420Ah Quick Specifications Table

§2 — The Pain

The hard DC rooms — telecom power rooms under a viaduct, signalling cabinets at a remote junction, a metro auxiliary room, a containerised hybrid site in a desert — share the same constraint. Someone has to service them, and nobody wants to be that someone. A flooded cell in that room means water, a torch, a density meter, a spill tray and a site visit every quarter. That visit is the expensive part: travel, access, permit, isolation and a two-person crew, four times a year, for twenty years.

The second pain is what happens when the service does not happen. A flooded string in an unattended room loses water, the density drifts, the terminal corrodes, and the first sign of trouble is a capacity test failure that happens to coincide with a storm. The same room on gel has no water to lose and no corrosion chemistry in the electrolyte, so the failure mode moves to something predictable — heat at the cell and the loss of capacity with time — which can be managed with a ventilation design and a monitoring plan.

The third pain is the one that appears in the tender document. Capacity is quoted as a single number. A 420 Ah cell can be rated at C10, at C20, at C3 or at 100 hours, and each of those describes a different physical cell. Two suppliers quoting “420 Ah” can deliver cells that differ by a quarter in usable energy for the same application, and the difference only appears in the acceptance test.

§3 — The Choice

Tubular gel sits between flooded tubular and sealed AGM. It gives up the lowest cost per stored kilowatt-hour of the flooded option, and it gives up some of the AGM option’s cycle tolerance, in exchange for removing the service regime entirely.

Every figure in the table comes from published CHISEN data for the respective chemistry; where a value is not published it is marked rather than estimated. The commercial comparison follows from the physical one: a gel string stores its energy in fewer cells, needs no service visits, and can be sited inside a building without an acid-resistant floor, a drip tray or a ventilation study. The flooded option still wins when the room has a trained technician on site every quarter, because the cell is cheaper per amp-hour and tolerates a wider discharge temperature window.

The wider gel range, from 100 Ah to 3,000 Ah in 2 V cells, is listed on the OPzV tubular gel battery hub, with individual model datasheets for sizing.

The seven-year arithmetic decides more orders than the datasheet does. Using illustrative unit prices that you must replace with your own landed and labour rates, the table below compares one 108 V, 45.4 kWh string built three ways. Every rate in it is a planning placeholder, not a quotation.

The result is not subtle. A flooded string of 54 cells carries a 20-plus-year float life and still costs roughly $18,390 more over seven years than the same string of OPzV2-420 2V420Ah gel cells, because the room, the ventilation path and the twice-yearly site visit are most of the cost. The sealed AGM option looks lowest on the seven-year invoice, and then its 12-year published float life turns it into a second purchase in year 12 — which is exactly why the OPzV2-420 2V420Ah is specified for rooms that must still be on float in year 15. Where the room has a trained technician on site every quarter, the flooded option is the correct economic answer; where it does not, the 20-plus-year float design life at 20 °C is what the buyer is actually paying for.

§4 — The Framework

Write the rate and the end-point into the specification. 420 Ah at C10 to 1.80 V per cell is the controlling figure for the OPzV2-420 2V420Ah. Anything less precise than that is an invitation to a 20 % argument at acceptance.

Decide the string voltage before the cell count. 48 V is 24 cells, 108 V is 54 cells and 216 V is 108 cells. With 54 cells at 2.23 V float, the busbar sits at 120.42 V at 25 °C, and the rectifier’s float set point has to be adjusted for the room temperature.

Check the rectifier against the 84 A per-cell ceiling. A 54-cell string can take 4,536 A into the battery. If the site’s rectifier is limited to the load plus a margin, the string recovers slowly after an outage, and a gel cell left in a partially discharged state is exactly where the cycle budget is spent.

Design the thermal environment. The published discharge range reaches 65 °C, but float life is quoted at 20 °C. Above 35 °C ambient, plan for cooling or accept the temperature derating, and keep the cells away from direct sun on a container wall.

Set the ventilation rule. Gel does not need hydrogen extraction at float, but it does produce gas during equalisation and at high charge voltages, and a sealed room with an aggressive equalisation schedule still needs a deliberate air path. Specify it and you avoid an inspection finding.

Plan the monitoring around what gel cannot tell you. No density reading means no early warning from the electrolyte, so the substitute is voltage and internal-resistance trending on the string plus a defined inspection interval with thermal imaging of terminals and busbars.

Fix the spare strategy. In a room that is hard to reach, the spare philosophy changes: instead of holding a percentage of float stock, hold one complete parallel string, because the whole point of gel is that you can swap it during a scheduled visit rather than troubleshoot a cell in a degraded string.

§5 — The Trust

Gel removes the maintenance that would have told you about a problem. That is an advantage and a risk, and the risk is handled in the contract.

First, the acceptance record. Ask for the incoming inspection, the manufacturer’s date of manufacture, the charge voltage and duration before dispatch, the conductance or internal-resistance reading for every cell, and a voltage-spread check across the assembled string. Without cell-level data at handover, a failure eighteen months later has no baseline to be measured against, and the vendor and the installer end up arguing about which reading was wrong.

Second, the commissioning regime. A gel cell shipped with a partial charge and installed without a proper initial charge can fail early. Specify the initial charge method, the charge duration, the end-point voltage per cell, and the temperature-compensated set points used for the first 30 days. Record the readings.

Third, the warranty terms. A twenty-year float life is a statement about the cell under a defined regime: 20 °C, voltage compensated, equalisation scheduled, and depth of discharge kept inside the published band. Ask the supplier to put those conditions in the warranty wording. If a warranty is written without temperature and maintenance conditions, it is worth very little at year eight.

Finally, watch the published data for internal consistency, as you would for any datasheet. Every specification in the table above comes from the model page, and the certification set on the gel line is assembled per customer requirement, which means the certificate list on the packing list is the document that counts. Ask for the certificates with the delivery, not after it.

§6 — FAQ

Q1. What is the rated capacity of the OPzV2-420 2V420Ah and at what rate? 420 Ah at the ten-hour rate (C10) to 1.80 V per cell at 25 °C. A twenty-hour rating is a different cell, and ordering on the wrong basis is the most common sizing error in this category.

Q2. Does the OPzV2-420 2V420Ah need electrolyte topping up? No. It is a sealed tubular gel VRLA cell with the electrolyte immobilised in a gel matrix, so there is no water to add, no density to read and no spill containment required.

Q3. How many cells are needed for a 108 V DC system? 54 cells of 2 V. A 48 V system uses 24 cells and a 216 V system uses 108. At 2.23 V float per cell, a 54-cell string sits at 120.42 V at 25 °C.

Q4. What is the maximum charging current? 84 A per cell, which is 0.2 C10. A 54-cell string can absorb up to 4,536 A, so the rectifier limits and the site protection scheme must be designed around that figure.

Q5. How many cycles can it deliver at 80 % depth of discharge? At least 1,500 cycles at 80 % depth of discharge, and it tolerates partial-state-of-charge operation better than a flooded cell, which is why it is common in hybrid telecom and renewable-assisted sites.

Q6. Does the cell need hydrogen ventilation? Not for normal float operation, because the electrolyte is immobilised and recombination limits gas release. Air exchange should still be provided for equalisation and for high-temperature charging, and for the general comfort of technicians working in the room.

Q7. What happens if the room is hot? Float life is quoted at 20 °C and shortens with temperature, as an engineering rule of thumb roughly halving for every 10 °C above that. Above 35 °C the cell will still operate within its published discharge range, but the 20-year figure no longer applies and the site needs cooling or a revised expectation.

Q8. What is the float current? At 5 mA per amp-hour, the OPzV2-420 2V420Ah draws 2.1 A per cell on float, so 113 A for a 54-cell string, continuously, for the life of the installation.

Q9. Which certifications are available? IEC 60896-21/22, IEC 61427, DIN 40472, GB/T 19638.1, YD/T 1360, Eurobat Long Life, BS 6290-4 and UL 1989, assembled per customer requirement, together with RoHS, REACH and WEEE documentation for the destination market.

Q10. How do I get a sizing sheet and a quotation? Send the string voltage, the DC load in kW, the required autonomy, the minimum end-point voltage, the highest expected room temperature and the delivery port — Shanghai, Ningbo, Mumbai, Jebel Ali, Santos, Rotterdam, Hamburg, Valencia, Mersin, Chattogram, Mombasa, Tema and Dar es Salaam are all reachable on the same terms — and we return a cell count, an energy budget and a float-current figure within one working day.

Expert Summary

The OPzV2-420 2V420Ah is a 2 V, 420 Ah C10 sealed tubular gel cell published at 145 × 206 × 471 mm, 506 mm over terminals and 31.5 kg, with 2.23 V float, 2.35 V equalise, −3 mV per °C per cell float compensation, 84 A maximum charge current, 0.62 mΩ internal resistance, at least 1,500 cycles at 80 % depth of discharge and a 20-plus-year float design life at 20 °C. A 54-cell string carries 45.4 kWh nominal at 108 V and 108 cells carry 90.7 kWh. The cell earns its place wherever the room cannot be serviced: no watering, no density readings, no spill containment, no hydrogen extraction at float, and a tolerance for partial-state-of-charge cycling that a flooded cell does not offer. Three things still decide the outcome. The rate basis must be written as 420 Ah at C10 to 1.80 V per cell, because a twenty-hour figure describes a different cell and produces a 20 % shortfall at acceptance. The charge path must be sized to the published 84 A per-cell limit, since a 54-cell string can absorb 4,536 A and a rectifier sized for the load alone leaves the string chronically undercharged. And the thermal environment must be designed, because float life is quoted at 20 °C and roughly halves for every 10 °C above it. Gel removes the service regime, not the discipline: specify the initial charge, the cell-level conductance and voltage-spread baseline, the temperature-compensated set points and the warranty conditions, or the absence of maintenance will simply move the failure to a point where there is no data to diagnose it.

Contact CHISEN — 24-Hour Response

Send us the string voltage, the DC load in kW, the autonomy in hours, the minimum end-point voltage, the highest expected room temperature and the delivery port, and we will return a cell count, an energy budget, a float-current figure and a charge-recommendation for the OPzV2-420 2V420Ah tubular gel cell.

WhatsApp: https://wa.me/861316226999 Email: sales@chisen.cn Factory: 8 production bases, 70 million kVAH annual capacity, CE, ISO 9001, ISO 14001, UL and IEC certified.

Related reading: the complete OPzV tubular gel battery range from 100 Ah to 3,000 Ah, and how CHISEN builds and certifies every cell.

This article is published on 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.

See Full Bio