Load Shedding Is a Business Risk, Not Just an Inconvenience
For South African businesses, load shedding is a direct financial cost — lost production hours, spoiled stock, disrupted customer service, equipment damage from power surges, and in some sectors, regulatory non-compliance if critical systems go offline. A 2022 South African Reserve Bank estimate placed the economic cost of load shedding at R500 million per stage per day across the economy. For individual businesses, the calculation is simpler: how much does one hour of downtime cost you?
The right backup power solution depends on your critical loads, your budget, your building ownership status, and how long your outages typically last. This guide works through the options in order of investment required.
Step 1 — Identify Your Critical Loads
Not everything in your business needs backup power. Before spending anything, list the specific equipment or systems whose failure causes immediate, material damage:
- Point of sale systems and card machines
- Internet connectivity and VOIP phones
- Refrigeration (for food, medicine, or perishable stock)
- Security systems and access control
- Servers and data storage
- Production or processing equipment
- Lighting for safety and operations
Size your backup solution for these critical loads first. Powering the entire premises is usually unnecessary and significantly more expensive.
Tier 1 — UPS and Small Inverter Solutions (R5,000–R30,000)
For businesses whose critical loads are primarily IT equipment, communications, and point of sale:
- Online UPS (1–3kVA) — provides seamless, uninterrupted power to connected equipment. A 2kVA online UPS (R4,000–R10,000) can run a POS system, router, and several workstations for 30–90 minutes depending on load.
- Inverter with AGM battery bank — a 2–5kVA inverter with 200–400Ah of battery storage (R12,000–R30,000) can power critical loads through a 2–4 hour outage and recharges from mains when power returns.
This tier suits small retail, professional services, and offices where continuity of IT and communications is the primary need.
Tier 2 — Generator (R25,000–R150,000)
A diesel or petrol generator provides full-premises backup for extended outages. Key considerations:
- Automatic Transfer Switch (ATS) — a generator with ATS automatically starts and connects within 10–30 seconds of a power failure. Without ATS, manual start and changeover is required.
- Sizing — a generator must be sized to handle the starting surge of all connected equipment (motors, compressors, air conditioners). A qualified electrician should calculate the required kVA, not just the running load.
- Fuel storage and consumption — a 20kVA diesel generator consumes approximately 4–6 litres per hour at 75% load. At 6 hours of load shedding per day, weekly fuel costs can be R800–R1,800.
- Compliance — generators above certain sizes require local authority approval for installation and operation. Noise restrictions apply in many commercial zones.
Generators suit businesses with high power requirements, critical refrigeration, or production processes that cannot be interrupted.
Tier 3 — Solar PV with Battery Storage (R80,000–R500,000+)
A commercial solar installation with battery storage offers the most comprehensive long-term solution, generating power during the day and storing it for use during outages or peak periods. For businesses that own their premises and have significant electricity costs, the return on investment is compelling at current electricity prices.
A 20kWp commercial rooftop system with 40kWh of lithium battery storage costs approximately R350,000–R500,000 installed. At commercial electricity tariffs of R2.50–R3.50/kWh, payback periods of four to seven years are typical for well-sized systems.
Tenants in leased premises can negotiate solar installations with landlords or use portable battery systems without structural modifications.
Surge and Spike Protection
Regardless of which backup tier you implement, surge protection is essential. Power surges on restoration after load shedding damage sensitive electronics. Fit a whole-building surge protection device at the DB board (R2,000–R6,000 installed by a registered electrician) and individual surge protectors at all sensitive equipment points. The cost of a surge protector is trivial compared to the replacement cost of a POS system, server, or production controller.
Working With an Electrician
All backup power installations involving connection to the main DB board must be done by a registered electrician who issues a Certificate of Compliance. Do not allow informal installations — an uncertified installation voids your building and equipment insurance and creates personal liability if a fault causes injury or fire.