With High Reliability, Expandability, Longer Warranties, NSPOF (no single point of failure), and Shading-Resistant, Micro Inverters are the Future.
What are Micro and String Inverters?
Micro Inverters are small inverters attached to the railing, or to the back of the solar module and connected directly to the module by standard DC MC4 connectors. AC is then "inverted" at the module level and injected back into the house for use.
String Inverters are larger units usually installed inside the house, where 8 - 20+ Modules are connected in series, in a number of strings. If one Modules get dirty, shaded or fails (rare) the rest of the modules will stop or reduce production.
Are Micro Inverters better than string inverters?
Yes in most circumstances, for the reasons listed.
They are more expensive per Watt than string inverters, but have longer warranties as well.
- Complete scalability; from 1 Module to 100+ Module commercial level installations.
- Simple design & installation.
- Many technical advantages over string-inverter panel arrays (see diagram below)
- Safer than conventional solar power installations.
- Resilient to dust, debris and shading, limited to single module.
- Module level reporting and production playback.
- No single point of system failure.
- Low cost 3 Phase implementation
- 3 Phase Load Balancing (put more inverters on busy phase)
Pros and Cons of Micro Inverters vs Regular (String) Inverters