Overcoming High Consumption & Grid Instability — Solis 15kW Three-Phase Hybrid Inverter Helps Large Estate Achieve 80% Reduction in Electricity Costs

The Challenge:

A large residential property in South Africa faced two major challenges: exceptionally high energy consumption of 70–80 kWh per day, leading to substantial electricity costs, and an unreliable local grid with frequent power outages. These outages not disrupted daily life but also posed serious security concerns for the property.

The Solution:

R&D Solar Solutions, with over 16 years of industry experience, designed a robust backup and savings system centered around the new Solis 15kW three-phase hybrid inverter, paired with Dyness Power Brick batteries. This setup maximizes solar self-consumption for significant cost savings while providing seamless backup power during grid failures, directly addressing both economic and security needs.

Why Solis Was Chosen:

Perfect Capacity Match: The home’s peak load regularly exceeds 14kW. While a standard 12kW inverter would have been insufficient, Solis currently offers the only 15kW three-phase hybrid inverter on the market, making it the ideal fit for this demanding application.

Proven Value & Features: Solis products are recognized for their unique features and reliability. As the installer noted, the new inverter "married up perfectly" with the project requirements.

Strong Expert Support: Richard Lemmer of R&D Solar Solutions highlighted the value of Solis training: "Their training courses are excellent. Going through the process from skepticism to hands-on use gave us full confidence in the product."

Results Delivered:

After three months of stable operation, the system has achieved an approximate 80% reduction in the household electricity bill. The estimated payback period is just 3.5 to 4 years. Beyond the direct financial return, the system provides continuous peace of mind through enhanced energy security and reliability.

About the Installer:

R&D Solar Solutions, established in 2008, brings more than 16 years of specialized experience in solar, having completed over 500 residential and commercial installations.