South Africa has gone a long stretch without load-shedding. Eskom carried the country through the whole 2026 winter without a single round of it, and by early July we had passed roughly 413 consecutive days. That does not make the problem go away. Load-shedding can return, and load reduction still affects about 247 000 households in high-loss areas, mostly in the morning and evening peaks.
The realistic question for an estate is not "will the power go off", but "what stops recording when it does". The answer is almost always the same: the cameras keep running, and nothing is recorded, because the NVR and the PoE switch died with the wall socket.
What the stages actually mean
Eskom's scheme runs from Stage 1 to Stage 8, each stage shedding up to an extra 1 000 MW. The block length matters more than the number. Stages 1 to 4 use two-hour blocks in most of the country, Joburg gets four-hour blocks, and every block carries an extra 30 minutes for switching. A "two-hour" slot can be two and a half hours off, and a site can be scheduled twice in a day. Design for that, not for the stage number.
The arithmetic of staying up
Runtime in hours is battery amp-hours times volts, times efficiency, times depth of discharge, divided by the load in watts. The two numbers people get wrong are the efficiency and the depth of discharge. Lead-acid should only be discharged to about half, so its usable capacity is half the nameplate. Lithium can be used to 80 or 90 percent.
Take a 16-camera estate rack: 16 cameras at 7 W, plus the switch, NVR, ONT and router, comes to about 187 W, and you size to 240 W for headroom. On a 48 V 100 Ah lithium battery that gives roughly 16 hours. On a 48 V 100 Ah lead-acid bank, the same nominal capacity gives about eight and a half hours, because you can only use half of it.
What to power first
When capacity is limited, the order matters. The recorder and the PoE switch come first, because cameras running with nowhere to record is the worst outcome. Then the network core, then chokepoint cameras like the gate and the till, then access control, and the gate motor last, on a motor-rated unit of its own.
Inverter, UPS or solar
A small standby UPS bridges a dip and protects the NVR from a dirty shutdown. It is not a load-shedding answer. An inverter with a battery bank is the mainstay, and it must be pure sine wave if anything has a motor. Size it 20 to 25 percent above the running load. Solar only makes sense if you want indefinite runtime.
On the paperwork: every installation must comply with SANS 10142-1 and carry a Certificate of Compliance. A backup-only inverter that is not grid-tied does not need NRS 097-2-1. A grid-tied one does. Confirm the current editions with your contractor.
The moment you are most likely to lose equipment
It is not the outage. It is the return of power, when the supply comes back with a surge. Fit a surge protective device at the distribution board, and point-of-use protection at the rack. Long outdoor Ethernet runs are also a path for lightning damage, so protect those too.
This is all standard, and none of it needs to be expensive. Most estates need a lithium inverter sized to the rack, a Certificate of Compliance, and a surge device. If you are not sure what your rack actually draws, that is exactly the kind of thing a site assessment sorts out.