Micro-Inverters VS String-Inverters.

Micro-Inverters vs String-Inverters.




Let's begin with the differences between an inverter and a string inverter:

  • Micro Inverter -A small weatherproof inverter mounted behind every solar module. Converts the solar panel's DC power to AC power directly on the panel. This is a new trend in solar energy. String Inverter-A central inverter also called it.
  • String Inverter - A central inverter also called it. These connect solar panels to strings and connect the DC power to a large inverter in a central location. It converts power for all modules simultaneously. In the last 40 years this has been the traditional approach.

Micro-Inverters advantages over String-Inverters:

Simplicity

  1. Micro-Micro-Inverters can be installed by a every home owner safely and easily, while string-inverters are not. This is the biggest advantage, because it means that you can save 50% or more by yourself.
  2. Micro-inverters are " plug & play " so that they are installed as complex as air conditioners or toasters. 
  3. String-inverters require the installer to work with 4 - 8 high - voltage DC wires to be connected to the inverter correctly. This goes beyond the typical home owner's abilities.
  4. String-inverters require the installer to calculate the line loss ohms in order to size the cable for the panels run. The installer also needs a separate grounding system for the panels, racking and string inverters.
  5. String-inverters require the installer to design the system to load every string of panels to load the inverter evenly.
  6. If a single panel fails in a string inverter system, it will be difficult to determine which string and it will be impossible to determine which panel in a string without removing all of them and testing them with a micrometer at a time.

Efficency

  1. Micro-inverters optimize each panel's power output to 15 percent more power per panel.
  2. If shading occurs, string inverter systems work poorly, but a micro-inverter system works optimally.
  3. If a single panel fails in a micro-inverter system, you will immediately know which one and the rest of the system will not be affected.

Safety

  1. String-inverters expose the installer to hundreds of DC volts, whereas micro-inverters do not generate electricity when not connected in grid. They are safe to handle, even in sunlight.
  2. There are hundred of ways in which the homeowner can wire a string inverter incorrectly and either burn it out, damage the panels or kill himself. Any damage caused is not guaranteed.
  3. There are no ways to wire a micro inverter incorrectly, because it's " plug & play. " Each link is stupid proof and can not be touched and can not be connected incorrectly.

Longevity = cost efficacy

  1. Micro-inverters are guaranteed 25yrs and have an average life of 332 years (yes, right). String inverters have a guarantee of 10yrs and do not last much longer because of their design.
  2. The most expensive equipment price, the string inverter, is most likely to have to be repurchased twice over the life of a system. For your size system, it costs $ 2,000 ( INR 1,20,000) every 10 - 12 years. This increases the cost of your system hardware by 50 percent over the entire lifetime.
  3. The most complex part of an installation, which wires the string inverter, needs to be reworked every 10- 12 years, and each time you can count on the inverter to be designed differently, everything needs to be relearned. If a pro does this, every time he charges 4- 5k.

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