A generator should never be plugged into a wall socket or wired into your board without a proper changeover switch. Done wrongly, it can send power back into the grid and put lives at risk, and it can damage your appliances. Thermo Group installs generator changeover switches and generator inlets for homes and businesses in Cape Town and issues the certificate of compliance. Call 021 203 5337 or 082 302 0683, we are open 24/7.
What a changeover switch does
A changeover switch lets you run chosen circuits from either the grid or your generator, but never both at once. That protects the generator, your wiring and anyone working on the power lines.
Manual or automatic
Manual changeover
You start the generator and move the switch yourself. Simple, reliable and the usual choice for homes.
Automatic changeover
The system detects the power cut, starts the generator and switches over. Used by businesses that cannot afford any downtime.
How we do it
- You tell us which circuits must stay on: lights, fridge, freezer, security, router, tools.
- We check your generator size and your distribution board.
- We install the changeover switch, a weatherproof generator inlet and the essential circuits.
- We test and issue the electrical certificate of compliance.
Generator or solar battery?
A generator is cheaper to buy but needs fuel, noise and servicing. A solar and battery system runs quietly and can cut your bill every day. See solar batteries and backup power. Some customers use both.
Get a changeover switch quote
Tell us your generator size and which circuits you want to keep running. Contact us, or call 021 203 5337 or 082 302 0683. Free quotes for planned work. Terms and conditions apply.
Generator changeover questions
Can I plug my generator into a wall socket?
No. This can send power back into the grid and is dangerous. A generator must be connected through a proper changeover switch installed by a registered electrician.
What size generator do I need?
It depends on what you want to run. Add up the power of the appliances you need at the same time, and remember that motors such as pumps and fridges draw more when they start. We can help you size it.
What is the difference between manual and automatic changeover?
With manual changeover you start the generator and flip the switch. With automatic changeover the system does it for you when the power fails.
Do I need a certificate of compliance after installing a changeover switch?
Yes. It is a change to your electrical installation, so we test it and issue a certificate of compliance.
Can a generator and solar work together?
They can, but the system must be designed for it so the two sources never connect incorrectly. We design the system around how you want to use it.