Solar · outages
Only if a battery and a hybrid or off-grid inverter are in the circuit. A plain on-grid inverter disconnects within a second of losing the grid — even at noon in June — because it must not energise a dead IESCO line. Islamabad's outages are shorter than up-country, but a monsoon feeder trip at half past seven still finds every battery-less system dark.
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A squall rolls off the Margallas at half past seven and the feeder trips. What the next two hours look like depends entirely on which system is on the roof — and the difference is not subtle.
Panels + grid-tied inverter
Panels overhead, darkness underneath.
The one that stays on
Hybrid inverter + modest bank
Most evenings, nobody looks up from dinner.
No IESCO connection at all
Immune to the feeder — hostage to the weather.
This is where expectation and physics part company. A bank that carries lights and fans all evening carries an air conditioner for about an hour. The recorder line matters more than people expect: cameras that stop recording during outages fail at exactly the moment they were bought for.
| Load | Draw | On a modest bank |
|---|---|---|
| 10 LED lights | 100 W | All evening, easily |
| 4 ceiling fans | 280 W | All evening |
| Inverter fridge | 120 W averaged | Evening and overnight |
| Router + CCTV recorder | 60 W | Days — worth wiring first |
| LED TV | 100 W | All evening |
| Water pump, 1 hp | 750 W running, triple to start | Short bursts only |
| 1.5-ton inverter AC | 1,100–1,600 W | About an hour on a modest bank |
The pump is the line that catches people out: its starting surge is several times its running draw, and an inverter sized on the running figure trips every time the tank calls for water.
Only through a hybrid or off-grid inverter with a battery. A grid-tied inverter disconnects within a second of losing the grid, however bright the sky, and stays off until the feeder returns. It is a safety requirement, not a fault — and the single most misunderstood fact in solar.
Two reasons. It builds its AC output by locking onto the grid's waveform, so with the grid gone it has no reference. And it must never push power into a dead line that an IESCO lineman may be repairing. Anti-islanding shutdown is designed in, worldwide, on purpose.
Only if the inverter is a hybrid. A plain on-grid unit has no battery terminals and no changeover, so adding storage later means replacing the inverter itself. That is why the outage question belongs in the conversation before purchase, not after the first dark evening.
Milder than rural Punjab — scheduled shedding is limited in most sectors. But monsoon feeder trips, maintenance shutdowns and voltage dips are routine enough that offices keep servers and CCTV on backup, and most houses see the lights go out when a July storm rolls off the Margallas.