String inverters are the most commonly used type of inverters and most proven technology. However, they are designed such that the entire string only works as well as the worst panel. For example, if one panel is only working to 50% capacity, all of the panels will work to that same lowest sustainable current, from the shaded panel.
Advantages of String Inverters
- Good flexibility with design over large roof spaces.
- Very high efficiency.
- 3 phase cost effective options especially for larger scale systems
- Low cost of installation.
- Remote system monitoring available for inverter output.
- Recognised brands offer good support and quality products.
- Proven technology.
Disadvantages of String Inverters
- No panel level monitoring.
- High voltage levels from the panels may present a safety hazard.
- All panels are only as efficient as the least efficient (as mentioned above).
- If one panel goes down the whole string could go down.
- Older technology, service and support may not be as responsive as other types of products.