LookSee Reveals Why Hybrid Solar Systems Often Fail to Cut Geyser Costs and Proposes Dedicated Panel Conversions

LookSee explains why standard solar systems often fail to heat geysers efficiently and why dedicated solar panel conversions offer better savings.

By: AXL Media

Published: Apr 29, 2026, 5:29 AM EDT

Source: Information for this report was sourced from MyBroadband

The Conflict Between Solar Generation and Water Heating Needs

Water heating typically accounts for 30% to 40% of a South African household's electricity bill, making it a primary target for solar integration. However, many homeowners are finding that their electricity bills remain high even after installing hybrid solar systems. Marc du Plessis, executive head of LookSee, explains that the core issue is a timing mismatch. Demand for hot water usually peaks in the early morning and evening—times when solar panels are producing the least amount of energy. Consequently, the system is often forced to pull power from the grid to meet the heavy 3kW to 4kW draw required by a standard geyser.

The Hidden Costs of Sizing a Solar System for Geysers

To fully cover a geyser using a standard hybrid system, the hardware requirements are often underestimated. Du Plessis notes that for every hour of heating needed outside of peak sunshine, a household requires approximately 5kWh of dedicated battery storage. This is in addition to the storage needed for essential appliances and overnight loads. Scaling an inverter and battery bank to handle these requirements necessitates more solar panels and significantly higher upfront capital. This increased investment can drastically extend the time it takes for a homeowner to see a return on their investment (ROI) through electricity savings.

Limitations of Geyser Timers in Integrated Systems

While geyser timers are a popular low-cost intervention, they have inherent limitations. Timers allow users to schedule heating during daylight hours, but they operate independently of the rest of the home's electrical load. If a geyser activates while other high-draw appliances—such as washing machines or dishwashers—are running, the combined load may exceed the inverter's capacity. In these instances, the system automatically supplements with grid power, negating the potential savings and leaving the homeowner with an unexpectedly high utility bill.