Just a couple of follow-ups to this old post:
Solarpro wrote:The SolarEdge inverter and power optimizer combination is a much better buy than micro inverters when it comes to performance and reliability.
The performance of the SolarEdge inverters is inferior to the M215s, as I will discuss below. With regard to reliability, this may be true when comparing the SolarEdge product with the now-discontinued M190s, but the M215s have a field-demonstrated MTBF of approximately 1000 years
, which is more than sufficient for the application. I have seen no data on the measured MTBF of the SolarEdge PowerOptimizers. The SolarEdge inverter, OTOH, only has a design lifetime of 18 years and only comes with a 12-year warranty
, which is less than half the warranty provided by Enphase.
Solarpro wrote:Second, the Enphase 215 is only rated for 96.3 maximum efficiency and a CEC weighted efficiency of 96%. SolarEdge offers a considerably higher peak efficiency rating of 98.3% and a CEC weighted efficiency of 97.5%. This may not seem like a big difference but when you consider the 30 to 40 years life expectancy of your solar panels, the difference in efficiency will add up to considerable amount of power.
I agree that the small differences in efficiency will add up to a considerable amount of efficiency over the life of the units. But the efficiency difference is NOT in the direction which you have indicated. Instead, Enphase microinverter-based systems have been demonstrated to produce over 2.5% MORE electricity than a comparable SolarEdge system
. For a 10kW system in my climate, that equates to about 10 MWh less production from the SolarEdge system versus the Enphase system. At $0.20/kWh (estimated average price for electricity over the next 25 years, probably conservative) that is an additional $2000 worth of electricity harvested by the Enphase system which would be lost by the SolarEdge system. If you add in the cost of a second central inverter, then you are faced with a benefit of over $5000 by using the Enphase inverters over the life of the system.
The coming support for battery backup using the Tesla PowerWall
is a nice feature of the SolarEdge system, but note that the addition of a battery will further lower the efficiency of the SolarEdge solution.