Quick answer
MPPT stands for maximum power point tracking. It is the algorithm your inverter uses to continuously find the voltage and current combination that extracts the most power from a solar string as light and temperature change through the day. Better MPPT means more harvested kWh from the same panels, and having more than one MPPT lets differently oriented roof sections perform independently.
What you can do now
- 1Check how many MPPTs your inverter has and how your strings are allocated to them
- 2If your roof faces two directions, confirm those sections are on separate MPPTs
- 3Watch the monitoring app for one MPPT consistently underperforming
- 4Understand that shading on one panel drags down its whole string unless optimisers are fitted
- 5Compare inverter options on MPPT count and voltage range, not just on kW rating
When to call a professional
Choose inverters with dual MPPT for split-orientation roofs — it is one of the specification decisions that quietly determines yield for the next fifteen years. Ask your installer to show the proposed string layout and which MPPT each string connects to, and to explain how shading has been allowed for in the design.
Typical cost in Johannesburg
Already in inverter cost
Indicative ranges only. We provide written, itemised quotes before any work.
Related services
Need a Plumber or Electrician Today?
Owner-managed by Garth Blair. We pick up the phone and book you in personally.