Kwikot ELON Solar Geyser: How It Works Without an Inverter or Battery

In most South African homes, the geyser is the single biggest user of electricity, often responsible for a large share of the monthly bill. With tariffs climbing every year, more Gqeberha homeowners are asking how to heat water with the sun without spending a fortune on a full solar system.

That's exactly where the Kwikot ELON comes in. This guide explains how a PV solar geyser works, how it differs from traditional solar geysers and full solar setups, what it can save you and whether it suits your home.

What is a PV solar geyser?

A PV (photovoltaic) solar geyser uses solar panels to generate electricity that heats your existing geyser element directly. Instead of pumping water through rooftop tubes like a traditional solar water heater, it uses ordinary solar panels and a controller.

The Kwikot ELON range is one of the best-known PV water heating systems in South Africa. Panels on your roof feed DC power straight to the ELON controller, which sends it to your geyser element. There's no inverter and no battery involved.

How does the Kwikot ELON work without an inverter or battery?

A geyser element is a simple resistive load, so it can use DC power from solar panels directly; the ELON controller manages that power efficiently.

1. Solar panels generate DC power during daylight.
2. The ELON controller optimises that power and sends it to the geyser element, activating from as little as 20V so it works in lower light too.
3. Your water heats up during the day and stays hot in the insulated tank for evening use.
4. Grid power acts as a backup on very cloudy days or when demand is high.

Because the panels power the geyser directly, it keeps heating water during daytime load-shedding, as long as the sun is out.

How does it compare with traditional solar geysers and full solar systems?

A PV geyser sits between a traditional solar water heater and a full inverter-and-battery system: simpler and cheaper than full solar, and more flexible than water-filled rooftop collectors.

• Versus evacuated-tube or flat-plate solar geysers: no water on the roof, no risk of frozen or leaking collectors and no plumbing up to the roof. Only electrical cabling runs from the panels.
• Versus a full solar system: no inverter or battery to buy or replace. It only heats water, but that's often where the biggest saving lies.
• Versus a heat pump: heat pumps are efficient but still draw grid power; a PV geyser uses free daytime sunlight.

Which Kwikot ELON option is right for your home?

The right option depends on whether your current geyser is in good condition and whether you already have panels.

• ELON 100 unit: the core controller that converts a standard electric geyser into a solar water heater, with support for arrays of up to 4kW.
• ELON 100 solar PV kit: a complete package with the controller, Jinko solar panels (2 or 3 panels, 1 to 1.5kW) and roof mounting for tiled, IBR and Klip-Lok roofs.
• ELON 100 water heater kit: the controller paired with a brand-new 150L or 200L geyser, ideal if your geyser is old or due for replacement.
• ELON Smart unit: a retrofit smart thermostat with an app, dual temperature set-points and early fault detection, which also makes your geyser solar-ready.

See the full range on our solar geyser installation page.

How much can a Kwikot ELON solar geyser save?

AquaVolt typically sees savings of 50 to 70% on water heating costs, with a payback period of around 2.5 to 4 years. Your actual savings depend on:

• How much hot water your household uses
• The size and orientation of your roof
• Shading from trees or nearby buildings
• Your electricity tariff

Gqeberha's generally good sunshine makes PV water heating a strong option for many homes in the metro.

Is a PV solar geyser right for your home?

It's a strong fit for households that use a lot of hot water, want to cut electricity costs and don't want the expense of a full solar system.

It may be less suitable if your roof is heavily shaded, has very limited space or if you're planning a full solar and battery installation soon (in which case the geyser can be included in that design).

Before installing, it's also worth checking your geyser's condition. Our members receive an annual geyser inspection that picks up corrosion, pressure faults and slow leaks before they become a burst geyser.

What does installation involve?

A typical installation involves mounting the panels, installing the ELON controller near the geyser, connecting the wiring and testing the system. As with any electrical work, it must be done by a registered electrician and certified with a certificate of compliance.

At AquaVolt, every new installation is inspected and signed off by a certified electrician or plumber before we consider the job done. Learn more about our electrical services and plumbing services.

Frequently asked questions

Does a Kwikot ELON solar geyser need an inverter or battery?

No. Solar panels feed DC power straight to the ELON controller and your geyser element, so no inverter or battery is needed.

Does a PV solar geyser work during load-shedding?

Yes, during daylight. The panels power the geyser directly, so it keeps heating while the grid is down, as long as there is enough sun.

Can I keep my existing geyser?

In most cases, yes. The ELON 100 controller converts a standard electric geyser in good condition without replacing the element. If your geyser is old or failing, a kit with a new 150L or 200L geyser may make more sense.

How much can a solar geyser save?

AquaVolt typically sees savings of 50 to 70% on water heating costs, with payback in around 2.5 to 4 years. Actual savings depend on your hot water use, roof and sun exposure.

Will I still have hot water on cloudy days?

Yes. The system switches to grid power when solar output is too low, so you still have hot water.

Do I need a certificate of compliance for a solar geyser?

Yes. The electrical work must be done by a registered electrician and certified with a certificate of compliance.