Comments on: Pros and Cons of Solar Panel Micro Inverters [Video]

By: Edgar

Edgar — Mon, 17 May 2010 20:56:39 +0000

Why would somebody choose a Tigo Energy system over a EnPhase system? I am looking to install 16 panels and looking to use EnPhase. I just learned about Tigo, however, and am now trying to determine which would be best. I do not need to worry about different panels or different positioning. My question is really which approach would be more efficient?

By: cbdh19

cbdh19 — Wed, 04 Nov 2009 04:12:40 +0000

I wanted to correct the 119-year figure. I misunderstood some of the info on the Enphase web page. In fact, Enphase predicts a 25-year life for its micro-inverters.

By: cbdh19

cbdh19 — Mon, 02 Nov 2009 05:50:17 +0000

I’m going to answer a couple of my own questions.

According to Enphase.com, the micro-inverters have a “mean lifetime” of 119 years. That’s right, they’re claiming a life that’s probably 4 times that of the panels themselves.

Of course, Enphase only guarantees the inverters for 15 years.

In comparison, Sunny Boy offers 10-year warranties on its inverters. And it’s my understanding that a centralized inverter lasts no more than 15 years. At which point, you’ll need to plop down probably a couple thousand dollars (or more) to replace it.

The micro-inverters are really beginning to intrigue me. Of course, my solar consultant is trying to steer me away from them, saying they’re too expensive.

But I wonder — if you add in the cost of replacing a centralized inverter at year 10 or 12, plus lower efficiency of the system, which means more panels are needed, and IF the micro-inverters really do last 100 years, maybe it’s not more expensive to go with micro-inverters…

By: cbdh19

cbdh19 — Sun, 01 Nov 2009 03:13:31 +0000

Dave,
Looking forward to the interview. I’m especially interested in the “how long to micro inverters last” question. If they last substantially longer than a traditional, centralized inverted (supposedly these last 10 to 12 years), then the costs potentially even out over the long term.

Always wondered how solar companies can get away with projecting your long term costs — without ever adding in the cost of replacing your inverter at year 10 or so of the system…

By: Dave

Dave — Sat, 31 Oct 2009 00:29:08 +0000

Great questions, I will make sure to ask some of them in my next interview.

By: cbdh19

cbdh19 — Fri, 30 Oct 2009 05:28:17 +0000

The micro inverter almost sounds too good to be true. A few quick questions:

1. How much more does a system with micro-inverters cost exactly?
2. How long do micro-inverters last?
3. How durable are they?
4. How long have they been on the market, have they been able to prove themselves?
5. Are there any cons, because Ken doesn’t mention any in this video?
6. Am I making a mistake going with a traditional inverter for a system we’re having installed in a few months?