Home Battery Backup System SA — Complete Guide
The South African backup power market has exploded since 2022, with dozens of products now available at every price point. From a R800 UPS that keeps your router alive for 2 hours, to a R200,000 whole-home battery system that runs everything for 12+ hours — there's a solution for every budget. This guide helps you navigate the options, understand the trade-offs, and size the right system for your home.
Types of Battery Backup Systems
| Type | Cost (ZAR) | What It Powers | Runtime | Best For |
|---|---|---|---|---|
| UPS (line-interactive) | R800–R3,500 | Router, laptop, decoder, 1–2 lights | 2–6 hours | WFH essentials, renters |
| Portable power station | R3,000–R15,000 | Lights, fans, laptops, small appliances | 4–12 hours | Renters, portable use |
| Inverter + lead-acid battery bank | R5,000–R20,000 | Selected circuits (lights, fridge, TV) | 2–6 hours | Budget homeowners |
| Inverter + lithium battery bank | R15,000–R60,000 | Most household circuits | 4–12 hours | Homeowners wanting reliable backup |
| All-in-one (inverter + battery integrated) | R18,000–R45,000 | Full home (depending on size) | 4–10 hours | Clean install, ease of use |
| Solar + hybrid inverter + battery | R60,000–R200,000 | Full home, self-charging | 12+ hours (solar tops up) | Long-term independence |
Step-by-Step Battery Sizing Guide
Step 1: List Your Critical Loads
Write down every appliance you NEED during load shedding (not everything you want). Be realistic — the more you include, the bigger and more expensive the battery bank.
Step 2: Find Each Appliance's Wattage
Check the label on the back or bottom of each appliance. Common loads:
- LED lights: 8–15W each
- Fridge/freezer: 100–200W (compressor cycles, average is lower)
- 55" LED TV: 100–150W
- DStv decoder: 15–25W
- Laptop: 45–90W
- WiFi router + fibre ONT: 15–30W
- Phone charger: 15–25W
Step 3: Calculate Daily Energy Needed
Multiply each appliance's watts by hours of use during a load shedding cycle:
Energy (Wh) = Watts × Hours
Example: Fridge (150W average × 4 hours) + TV (120W × 4 hours) + Lights (80W × 4 hours) + Router (25W × 4 hours) = 600 + 480 + 320 + 100 = 1,500Wh (1.5kWh) per load shedding cycle.
Step 4: Account for Battery DoD and Inverter Efficiency
Divide by usable DoD and inverter efficiency:
- Lithium LiFePO4: 80% DoD × 95% inverter efficiency = 76% usable
- Lead-acid: 50% DoD × 90% inverter efficiency = 45% usable
For 1.5kWh needed: Lithium bank needed = 1.5 ÷ 0.76 = 1.97kWh (≈ 2 × Pylontech US2000). Lead-acid needed = 1.5 ÷ 0.45 = 3.3kWh (much larger and heavier bank).
How Long Will My Battery Last? (Runtime Examples)
| Setup | Total Usable Energy | Light load (500W) | Medium (1,000W) | Heavy (2,000W) |
|---|---|---|---|---|
| 1 × Pylontech US2000 (2.4kWh) | ~1.9kWh | 3.8 hours | 1.9 hours | 0.9 hours |
| 2 × Pylontech US2000 (4.8kWh) | ~3.8kWh | 7.6 hours | 3.8 hours | 1.9 hours |
| 3 × Pylontech US3000 (10.5kWh) | ~8.4kWh | 16.8 hours | 8.4 hours | 4.2 hours |
| 4 × 200Ah AGM lead-acid | ~4.8kWh usable | 9.6 hours | 4.8 hours | 2.4 hours |
Installation Requirements
- All installations must be done by a registered electrician — a Certificate of Compliance (CoC) is required
- Batteries must be installed in a ventilated area away from direct heat and flammable materials
- Lead-acid batteries emit hydrogen gas during charging — never in a sealed room
- Lithium batteries should ideally be mounted vertically as specified by the manufacturer
- The inverter connects to a dedicated sub-board feeding your "essential" circuits
- Grid-tied and hybrid systems require municipality notification and smart meter registration
Frequently Asked Questions
Can I add solar panels to my battery backup system later?
Yes — if you buy a hybrid inverter now. A standard inverter cannot accept solar input, so plan ahead. A hybrid inverter costs more upfront but means your battery bank charges from solar during the day, reducing or eliminating the need to charge from Eskom. See our solar panels guide for the full picture.
What is an all-in-one battery backup unit?
All-in-one units (like the Greenrich, Mecer Axpert, or Kodak VMIII series) combine the inverter and battery in a single plug-and-play cabinet. They're easier to install, neater, and need less technical knowledge — ideal for apartments or homes where simplicity matters more than expandability.
Need help sizing your backup system?
Tell us your load shedding hours and what you need to run — we'll recommend the right system size and battery bank.
Ask Our Experts →