Every lead acid battery is a chain of 2V cells; the 2V battery simply sells you the cell itself, unbundled. Stationary engineering prefers it that way at scale: a 48V telecom string is 24 cells, a 110V utility string is 55, and each cell can be monitored, tested and — in principle — replaced as an individual. Capacity per cell runs far beyond any monobloc: XD Battery’s documented 2V cells are the OPzS 500Ah and 1000Ah models and the OPzV 800Ah and 1000Ah cells.
| OPzS 2V 500Ah | 26 kg · 166 × 206 × 470 mm · flooded tubular · warranty 3 years |
|---|---|
| OPzS 2V 1000Ah | 53.5 kg · 233 × 210 × 645 mm · flooded tubular · warranty 3 years |
| OPzV 2V 1000Ah | 73.2 kg · 233 × 210 × 646 mm · sealed tubular gel · warranty 3 years |
Blocks or cells? The crossover
Below roughly 10 kWh of bank, 12V blocks win on simplicity: fewer interconnects, commodity handling, cabinet formats. Above it, 2V cells take over on every axis that matters over a long life — per-cell monitoring, no parallel strings, capacities per string that blocks cannot reach, and a replacement unit that is one cell rather than a sixth of a bank. The blog’s 2V versus 12V battery bank guide does the full arithmetic with a telecom example. Note the handling reality in the table above: these are 26 to 73 kg units, 645 mm tall — battery-room equipment, planned with stands, spacing and lifting in the design, not an afterthought.
Discipline choice remains: OPzS flooded where staff will water and test; OPzV sealed gel where the site is unmanned or the room must stay clean. Both are tubular-plate designs — the longevity mechanism is the plate, the electrolyte choice is the maintenance contract.
How many 2V cells for a 48V system?
Twenty-four in series. For 24V, twelve; for 12V, six — though at 12V, monoblocs are almost always the practical answer.
Can one failed cell be replaced alone?
Physically yes, and this is a core advantage of the format. Electrically, a new cell in an old string should be commissioned carefully — ask us about the procedure when ordering a replacement cell.
Do you supply stands and connectors?
String hardware is specified with the order — tell us the room layout and string count and the quotation will carry the mechanical scope.
Commissioning a cell string
A 2V string is commissioned as a system: cells are rested and voltage-checked on arrival, installed on their stands with the specified spacing, interconnected with equal torque, and brought onto float as a complete string before a baseline capacity test is logged cell by cell. That baseline — 24 or 55 individual numbers — is the string’s birth certificate and the reference for every future maintenance reading. Buyers new to cell plants should budget the commissioning as part of the project rather than an afterthought: the difference between a cell string that serves its design life and one that merely occupies a room is usually written in its first week. Our quotations can include the inter-cell connectors and the commissioning documentation checklist with the cells.
Documentation closes the loop: the OPzS 500Ah, OPzS 1000Ah and OPzV 1000Ah models publish CE, UL, ISO 9001 and RoHS certification names in their product documentation; the OPzV 800Ah model’s archive records no certification names, so its documentation pack is confirmed at quotation — certificates available upon request, as with the rest of this catalogue.