Yes, if someone violates the standard practices of PV planning, microinverters can provide such a performance improvement.Mothernaturesolar wrote:Saleem,
With Enphase M215 inverters, you'll get-
1- 20% better performance. Each inverter takes the highest amount of electricity that is available from each panel. But a DC inverter can only pull power at the rate of the slowest panel. IE, if you have 3 panels putting out 190, 195, and 200 watts, the DC inverter will only pull 190 watts from each.
In the world outside of marketing, however, one installs the same panel brand/type/size in any one string. They do that because those PV panels will be within 1% or 2% of each other. In the real world, microinverters will not provide "20% better performance" compared to a string inverter on the same array.
Yes, this "can" happen, but is not likely to for code-compliant installations. All inverters must go off line immediately when main power is disconnected (anti-islanding). So neither inverter type is 'superior' to the other in this instance.Mothernaturesolar wrote:5- Safety for your family, as the Enphase inverters shut off the electric flow from the panels to the electric main panel when the breaker is shut off, not so DC inverters. If you have a house fire, the DC panel system is always hot with dangerous high voltage DC electricity.
The PV combiner box is supposed to be near the array. There are combiners that are roof mounted (with the array) that have disconnect switches at ground level.
Either method is just as safe for families and emergency personnel.
Get a price quote that separates the panels from the balance of system and installation. You can likely get a much better price this way. Sunelec Miami has top of the line panels from about $0.60 per Watt, for example.