01 December 2010

Enphase micro-inverter projects

Micro-inverters are an alternative to string inverters. Inverters convert the DC power from the panels to AC. A micro-inverter is wired to one panel, so you have as many inverters as panels. A string inverter has all the panels wired to it - only one inverter is converting the DC to AC power. Everyone has an opinion on which is better, especially sales people. I won't enter that debate now.
The purpose of this entry is to provide a link to a solar company website with solar PV sysetems with Enphase micro-inverters installed here in Ontario. Sentinel Solar has six projects listed on their website. [Oddly enough, when looking at each system some seem to be installed by different solar companies, not necessarily by Sentinel. Nothing like advertising for your competitors]. You will notice some things about these systems:
  • the Enphase micro-inverters provide panel-specific monitoring - interesting to see the variability between the panels
  • the web monitoring is nice if you are curious about instantaneous and historical power production
  • you can see the difference between the various systems all in one spot
  • you can't compare one system against another as some are roof mounted, others are trackers, and the panels are likely different at each location
  • individual panel monitoring can help you understand the power production, however if you see the inherent differences between the panels it is quite likely you won't be doing much about it. It might just drive you crazy wondering why
Keep in mind, we don't see the costs of the different systems. Monitoring and power generation is interesting, but installation and maintenance costs are also part of the equation!

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