Case Study: How Nagin House Saved R1,500/Month by Fixing 'Ghost Loads'
Client: Nagin House, Residential Property
Location: Johannesburg, South Africa
Challenge: High electricity bills despite having a solar system.
The Problem
The Nagin family had installed a 5kW Sunsynk inverter and 10kWh battery backup to beat load shedding. However, they were still paying over R3,000/month to Eskom. They assumed their solar system wasn't working correctly.
The Audit Findings
We conducted a 7-day energy audit using our high-precision logging equipment. The results were shocking:
- The 'Ghost Load': Their pool pump was running for 8 hours a day, including peak evening hours, consuming 8kWh daily.
- Geyser Inefficiency: The geyser was heating water 24/7, even when no one was home, wasting another 6kWh daily.
- Solar Deficit: Their 3.6kW panel array produced ~18kWh/day, but their total consumption was ~36kWh/day. The system was draining the batteries by 8 PM, forcing them back onto the grid all night.
The Solution
We didn't sell them more panels. Instead, we optimized what they had:
- Timer Optimization: Moved the pool pump to run only during peak solar production (10 AM - 2 PM).
- Smart Geyser Control: Installed a smart timer to heat water only before usage times (5 AM and 4 PM).
- Load Shifting: Educated the family to run the washing machine and dishwasher during the day.
The Results
- Grid Usage Reduced: From 36kWh/day to 12kWh/day.
- Monthly Savings: ~R1,500/month immediately.
- ROI: The audit paid for itself in less than 2 months.
"We thought we needed more batteries. PowerCentrix showed us we just needed to stop wasting what we generated." - Minal Nagin
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