- Battery Backup Systems Cape Town covers inverter and battery setups that keep your home or business running when the grid goes down.
- A backup system can work without solar panels, charging from the grid, and have panels added later.
- Compare quotes from installers on backup time, what the system can run, and price.
List the appliances you want running during an outage and for how many hours.
Get Battery Backup QuotesBackup Options Compared
| Option | How it works | Indicative price (incl. VAT) | Good for |
|---|---|---|---|
| Portable power station | Plug-in unit, charged from a wall socket | R4,000 - R25,000 | Wi-Fi, laptop, lights in one room |
| Trolley inverter | Plug-in inverter and battery on wheels | R8,000 - R20,000 | TV and Wi-Fi, short outages |
| Installed backup system | Inverter and lithium battery wired into the DB board | R28,000 - R50,000 | Whole essential circuits, automatic switchover |
| Hybrid system with panels | Backup plus solar charging and bill savings | From R55,000 | Hybrid solar systems |
What an Installed Backup System Includes
- Inverter or hybrid inverter that switches over automatically, usually within milliseconds.
- Lithium battery, typically 5kWh for a home starting point.
- Essential circuit split in the DB board so the backup feeds lights, plugs, Wi-Fi, fridge and gate motor.
- Protection, isolators and correctly sized cabling.
- CoC for the new electrical work.
What Can a Backup System Run?
Most home backup systems are designed around essentials. A 5kW inverter with a 5kWh battery commonly supports lights, Wi-Fi, TVs, a fridge, laptops, a gate motor and an alarm, with short use of a kettle or microwave. Geysers, ovens, stoves, underfloor heating and aircons are usually kept off the backup circuit. Actual performance depends on the inverter rating, the battery's discharge limit and what you switch on at the same time.
| Backup system | Indicative installed price | Essentials run time (approx. 400W) |
|---|---|---|
| 3kW inverter, 5kWh battery | R28,000 - R42,000 | About 10 hours |
| 5kW inverter, 5kWh battery | R34,000 - R50,000 | About 10 hours, higher loads possible |
| 5kW inverter, 10kWh battery | R52,000 - R80,000 | About 20 hours |
| 8kW inverter, 15kWh battery | R85,000 - R130,000 | About a day, heavier loads possible |
Run times exclude solar charging and assume typical usable capacity.
Get backup quotes sized to what you actually need to keep running.
Compare Backup Power InstallersChoose an Inverter That Can Grow
If you buy a hybrid inverter now, panels can be added later to turn backup into a full solar installation. A pure inverter-charger cannot take panels. The price difference is often small, so ask each installer for both options.
Backup for Businesses
Shops, practices and offices typically back up tills, card machines, servers, network equipment, security, lighting and cold storage. Three-phase sites may back up a single phase or use a three-phase inverter. For larger sites see commercial solar.
Cape Town Requirements
Backup systems wired into your electrical installation need a Certificate of Compliance. Because the inverter can connect to the grid, the City of Cape Town treats installed battery backup systems as falling under its SSEG requirements, so the inverter must be on the approved list and the system registered. Plug-in trolley units and portable power stations are generally excluded. See SSEG registration.
Things to Check in a Backup Quote
- Usable battery capacity at the installer's settings.
- Which circuits will be on backup.
- Switchover time, which matters for computers and networking.
- Whether panels can be added later without replacing the inverter.
- Whether the CoC and City paperwork are included.
Compare installed backup quotes through Solar Installers Western Cape and see solar battery installation for battery-specific detail.
Battery Backup Systems Questions
How much does a battery backup system cost in Cape Town?
An installed inverter and 5kWh lithium battery typically costs R28,000 - R50,000. Larger batteries and inverters cost more.
Do I need solar panels for a backup system?
No. A backup system can charge from the grid. Panels can be added later if you choose a hybrid inverter.
Can a backup system run my geyser?
It is not recommended. A geyser would drain a home backup battery quickly, so it is normally left on grid power only.
How fast does a backup system switch over?
Most installed inverters switch over automatically in a fraction of a second, fast enough that most electronics stay on.
Does a backup system need a CoC?
Yes. Any system wired into your DB board needs a Certificate of Compliance from a registered electrician.
Is a trolley inverter good enough?
For a TV and Wi-Fi during short outages, yes. For automatic backup of whole circuits, an installed system is better.
Related Backup and Solar Options
Solar Installers Western Cape is a free quote-comparison service. Installation, repair and maintenance work is carried out by the independent solar installers that quote you, and your contract is with the installer you appoint. Ask each installer for a written, itemised quote, the registered electrician who will issue the Certificate of Compliance, and their equipment and workmanship warranty terms before appointing anyone.
Battery Backup Systems Cape Town. Compare backup systems sized to what you need to keep running.
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