Three steps. One day. Zero plumbing.
Apex systems convert the geyser you already have into a solar-powered one — without touching the tank, the thermostat, or the element inside it.
Panels go up
Three lightweight PV panels for a 100l–150l geyser, or four for a 200l geyser — mounted on your roof and wired straight to the controller. No trenching, no pipework.
The controller takes over
Our MPPT controller feeds your geyser from two sources at once — sunlight by day, grid power on standby. Nothing inside the tank gets swapped out.
You take control
Pair the app over WiFi to see live tank temperature, set boost schedules, and switch to Eskom from anywhere — shared with the whole household.
Two power sources, no batteries
The controller feeds your geyser from both grid (AC) power and solar (DC) power at the same time — there's no backup battery involved. Whenever the sun is out, solar power goes straight into the geyser and is effectively stored as heat in the tank itself.
Crucially, the controller never sends raw DC into your element. It converts solar power into a modified waveform that your geyser's existing thermostat and element already know how to switch on and off, exactly as they would with normal AC power. That's why nothing inside the tank needs to be replaced — the geyser genuinely can't tell the difference.
Built-in MPPT
Every Apex controller uses MPPT (Maximum Power Point Tracking) to pull as much usable power out of your panels as possible, constantly adjusting to current weather and light conditions rather than taking a fixed amount regardless of how much sun is actually available.
No element swap, no thermostat swap, no fuss.
Because your existing element and thermostat stay exactly where they are, the install itself is straightforward — which keeps cost and hassle down on your side too.
- ✓ Lower installation cost than a full geyser replacement
- ✓ No change to your existing geyser
- ✓ Straightforward, single-day installation
- ✓ Works with any generic water tank
- ✓ Readily available spare parts
- ✓ SANS-compliant — paperwork available on request
Why this beats a plumbed solar geyser.
- ✓ More aesthetically pleasing — no bulky tank on the roof
- ✓ The tank can stay exactly where your current geyser already is
- ✓ Can switch off automatically once water is warm enough
- ✓ No water loss from overheating
- ✓ No circulating water or anti-freeze to worry about
- ✓ No efficiency losses from water circulation
- ✓ Panels and geyser can be installed far apart from each other
- ✓ No plumbing means no plumbing issues, ever
- ✓ Effectively no ongoing maintenance
The two systems, in detail.
For smaller households
- PV solar input90–200 Vdc
- Grid input200–240 Vac
- Element size2–3 kW
- Geyser size50–150 L
- Panels required3 × 500/545/575 W
For bigger households
- PV solar input90–350 Vdc
- Grid input200–240 Vac
- Element size2–4 kW
- Geyser size50–300 L
- Panels required4 × 500/545/575 W
Want to see it on a real roof?
Head over to The System page for real install photos and the two system sizes.
See The SystemRequest your free quote.
Tell us a bit about your geyser and we'll get back to you with a straight quote — no obligation.
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