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Replacement planning works out, for each UPS, how much life it has left, where its maker's support stands, and whether to refresh its electronics or replace it, so the change happens as a planned project with the load protected rather than after a failure.
It covers the whole route from an ageing UPS to a proven new one: an inventory of each unit's age, support stage and condition, the options for each (refresh or replace), the sizing and architecture of anything new, how the load stays protected during the change, and the commissioning that proves the result. The steps are set out in the table below; the sections that follow explain the facts each decision rests on.
| What happens | What you receive |
|---|---|
| Inventory: model, age, support stage, battery age | The list, with each unit's support stage |
| Condition: maintenance history, readings, findings | A condition summary per unit |
| Load: measured load and expected growth | The capacity to plan for |
| Options: refresh or replace, with timing | A comparison of the options |
| Cutover: how the load stays protected during the change | The cutover method |
| Commissioning and handover of the new system | The handover file |
A well-maintained three-phase UPS can last 15 to 20 years, but not with its original consumables. Eaton's aging-UPS paper says every vendor's three-phase UPS can theoretically operate that long with proper maintenance, while internal components can wear out much earlier, especially outside recommended conditions. Its component table gives the average recommended replacement for each part: air filters at 1 year, VRLA batteries at 4, fans and capacitors outside power modules at 7, and power modules, control boards and capacitors inside power modules at 10.
| Component | Recommended replacement (years) | Service life (years) | Design life (years) |
|---|---|---|---|
| Fans | 7 | 8 | 20 |
| Air filters | 1 | 1 | 20 |
| Capacitors outside power modules | 7 | 8 | 15 |
| Capacitors inside power modules | 10 | 11 | 20 |
| Power modules | 10 | 11 | 20 |
| Control and interface boards | 10 | 11 | 20 |
Source: Eaton, average life of consumable and electronic components. Actual life depends on the model and the environment. Batteries follow their own, shorter clock; see how long UPS batteries last.
Parts and coverage shrink in stages. Eaton's end-of-service-life table names them: active (full support), mature (best-efforts parts, replacement recommended), retired (no contract coverage, time and materials only) and obsolete (no service or parts). Mitsubishi's lifecycle page describes the same arc: as components become obsolete it becomes challenging and then no longer feasible to supply parts and support, and best-effort support continues only until the announced end-of-support date. Knowing where your model sits tells you how much time you have to plan.
It depends on the model's support stage, the condition of the frame, the load and how it is expected to grow, and the cost of downtime. Eaton frames the choice for a UPS of 10 years or more as three options: replace the UPS, update its internal electronics, or run it until it fails.
| Option | When it fits | What to watch |
|---|---|---|
| Replace the UPS | The model is retired or obsolete, the load has changed, or efficiency and footprint matter | Project time, installation and a cutover plan |
| Refresh the electronics | The frame is sound, the model is still supported, and the load fits | Parts availability and what the refresh resets |
| Run to failure | Rarely, for non-critical loads | Unplanned downtime and emergency parts |
Heat, dust and humidity. Eaton's paper explains that components wear faster with dirt and dust accumulation, humidity and heat; heat makes connections loose and brittle and speeds wear on capacitors and boards, and humidity outside the nominal envelope can grow dendrites that bridge connections. Vertiv's EXM2 manual recommends regular inspection and replacement of wearing parts within their estimated life, which is the purpose of preventive maintenance.
We build the plan from the UPS's age, support stage, condition readings and the site's load and growth, then set out the options with their timing. A replacement plan covers sizing (see UPS sizing), the choice of architecture and battery chemistry, the installation and cutover without dropping the load, and commissioning of the new system. For model-level end-of-life dates and named successors, see the discontinued three-phase UPS reference; for data-centre service by brand, see data-centre UPS service.
There is no single age. Eaton advises that UPS of 10 years or older be assessed for replacement or an electronics refresh; the support stage of the model and the condition readings decide the timing.
It can, but the risk of failure rises as each component ages, and parts become harder to find once the model leaves full support.
Often. It changes battery life, weight and footprint; see the lithium-ion vs VRLA guide.
It depends on equipment lead times, the installation and the cutover window; the plan sets the dates before anything is ordered.
Sources, checked 2026-10-04:
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