Used APC generators, ups & solar in Islamabad & Rawalpindi
Is a used APC generators, ups & solar worth buying?
APC units are imported and do a different job from the household inverter UPS: they are line-interactive or online machines built to hold a computer, a router or a rack alive for minutes, not to run a house through an outage. Second-hand, almost everything turns on the sealed internal battery, which is the consumable, and on which model family the unit belongs to.
Imported
Parts usually have to be imported or sourced from the grey market, so a repair takes longer and costs more — which matters more on an older unit than the build quality does.
Battery cartridges are the practical spare, and shops in Islamabad and Rawalpindi rebuild them with locally available sealed lead-acid cells rather than importing the original pack. Boards, fans and display parts are import items, so an electronics fault is a very different proposition from a battery replacement.
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Checking a used APC generators, ups & solar
These are specific to APC. The general generators, ups & solar checks apply too and are on the generators, ups & solar page.
Read the model family
The label separates the consumer Back-UPS lines from the Smart-UPS range. The latter has manageable electronics and serviceable battery cartridges and is the one worth restoring.
Run the self test
Hold the test button and watch the panel. A unit that drops the load immediately, or lights the replace-battery indicator, is telling you the pack is finished.
Inspect the battery pack
Sealed lead-acid cells swell as they fail and distort the plastic tray around them. A swollen pack must not be recharged and is the commonest fault on a unit that has been stored.
Ask about pack rebuilds
Local shops rebuild these cartridges with sealed cells sourced here. That is a legitimate repair, but ask, because runtime and cell dates will then differ from the label.
Time the actual runtime
Plug in the load you intend to use and pull the mains. Minutes on battery are the only measure that tells you what is left in the pack.
What APC generators, ups & solar are worth
- The battery is the consumable and the unit is the durable part, so a sound unit with a dead pack is still worth having where local cells can be fitted.
- Manageable rack and Smart-UPS models hold interest longer, because network cards and serviceable cartridges keep them in service.
- Units stored for long periods with a flat battery grade lower, since sulphated cells do not recover.
Model lines you will see second-hand
- Back-UPS BX
- Back-UPS BR
- Smart-UPS SMT
- Smart-UPS SUA
- Smart-UPS SRT
General generators, ups & solar checks
These apply whatever the badge on the front says — the generators, ups & solar page covers them in full.
Start it from cold
Ask that the generator has not been run that morning. A healthy engine catches within a few pulls, or on the first turn of the key, and settles to a steady note. Long cranking, a haze of unburnt petrol or blue smoke that will not clear after a minute points at worn rings or a carburettor that has been standing.
Run it under load
No-load running proves very little. Plug in something substantial, an iron or a heater, and listen. The engine should take the load with a brief dip and then hold. Lights that dim and brighten, or an engine hunting up and down, suggest a tired governor or a failing AVR.
Check the oil and smoke
Pull the dipstick before anything is started. Oil that is milky, thin or smells of petrol tells you more than any test run. Under load, black smoke is a fuelling problem and blue smoke is oil getting past the rings, and both are easier to spot before the engine is warm enough to hide them.
Inspect the battery bank
On a UPS or solar setup the batteries carry much of the value. Look for the manufacture date on the case, bulging sides, powdery corrosion at the terminals and low electrolyte in a tubular cell. A bank that charges full and then runs a couple of fans for minutes rather than hours is finished.
Watch the changeover
Switch off the main breaker with a fan and a light running. A sound inverter takes over without the fan stopping and without loud relay chatter. Note also whether it is a pure sine wave unit or a modified wave one, which makes fans and motors buzz and is wanted less.
Hold panels to the light
Look across a panel face at an angle. Cracked glass, hairline crazing across the cells, brown snail trails and bubbling of the plastic back sheet all mean output that will not come back. Check the junction box cover is sealed and the MC4 leads are not perished, and read the rating plate rather than trusting a quoted figure.
APC generators, ups & solar — questions
Is a used APC UPS any good for load shedding?
Can APC battery packs be replaced locally?
Other generators, ups & solar brands
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