SolarEdge model for 10kw system?

[boulter]

All the proposals I'm currently looking at are for 28-33 panel systems between 9.3kw and 10.7kw include a SolarEdge inverter. All of them but one are proposing using a SE 10000A-US.

One of the 9.3kw proposals include a SolarEdge 7600w inverter which seems like it will limit my output. When I asked why they chose that one, this was his response:

Our electrical engineers put together a string sizing sheet that I use to pick the right inverter size for our arrays. The reason that the inverter is sized smaller than the array is because the inverters require a minimum voltage to turn the inverters on to begin producing power. Solar arrays only reach their maximum output with ideal conditions a few times a year mainly on a cool spring sunny day. That small amount of excess power is "clipped" and lost. Using a 7600 inverter will produce more power during the days with lower solar insolation.

Does that sound accurate? I'm surprised only one installer has mentioned this. What would be the max total name plate panel wattage you would put to a SolarEdge 7600?

[Naptown]

Solar edge allows between 125 and 135 percent over wattage DC
If say you have an east west array or non co planer array you may be able to go higher as the array will not reach peak at the same time.
But you do need to keep strings within the limits depending on the application

[boulter]

All my panels would face the same direction (pretty much due South).

7,600 x 125% = 9,500w
7,600 x 135% = 10,260w

But is it true what he says that a lower wattage inverter will work more efficiently at typical power production of a 9.3kw system?

[Naptown]

The minimum voltage is not correct.
The optomizers are good between 7 and 25 modules depending on wattage ( max 5250w per string.)
The optimizer will adjust voltage to 350 volts on a string as long as the string is within their specs
Read the solar edge info and white papers.
Depending on your location you may see some ( minimal ) clipping on some days.
Solar edge has an online design tool you can use to determine how to string them and identify any clipping.