Path-Q Solar
When is a string inverter a poor choice for a roof with multiple orientations?
Answer
A single string inverter can be a poor choice when panels with substantially different orientations, tilts, or shading patterns must share the same electrical tracking input. Separate strings with suitable tracking, optimizers, or microinverters may better manage those differences.
Key points
- Panels with similar orientation and shading conditions generally work better together on one string.
- Different roof planes may need separate maximum-power-point-tracking inputs.
- A string inverter is not automatically unsuitable; the design depends on the inverter's number of inputs and the arrangement of the strings.
- Module-level electronics can provide flexibility but may add equipment, cost, and maintenance considerations.
What it depends on
- Number and direction of roof planes
- Tilt and shading differences
- Inverter input count and operating voltage range
- Array size and access for maintenance
Risks and trade-offs
- Poorly grouped strings can cause mismatch losses.
- Using one architecture for convenience may sacrifice production on a mismatched roof.
- More electronics can improve design flexibility but increase component count and replacement considerations.
Information you may need
- Roof map with orientation and tilt
- Shading by roof section
- Proposed string layout and inverter specifications
- Estimated production by architecture
Your next step
What to do next
Have the design compare separate-string, optimizer, and microinverter options using the actual roof planes and shading profile.
Path-Q
Find the right next step
Answer a few questions and we’ll narrow your options.
Loading…
SQ00694