julmou Posted June 6, 2022 Share Posted June 6, 2022 Good morning, I have a system with 6x modules, each with an Enphase micro-inverter. I am aware of the fact that micro-inverters tend to increase the AC losses (mentioned in this post: https://forum.pvsyst.com/topic/1929-what-can-i-gain-with-micro-inverters/) First, maybe a suggestion, it would be nice to have the Mismatch Losses automatically down to 0% when selecting micro-inverters (or to zero when ticking the Default option), just like it does when selecting power optimizers, and perhaps also the DC losses down to zero or close to zero. But mainly, I want to know how I can estimate my AC losses with micro-inverters. It doesn't seem the tool in Detailed Losses is correct in that case. Example below: I have 6x modules 500Wc. Now, obviously with micro-inverters, each module is in parallel with the other (each module being a individual string) and a single AC cable (with 230Vac) goes along all modules, and each module adds up its current to it -> at the end the AC losses should consider the total current in that AC cable. What it does instead is consider each inverter with its own cable separately. See the screenshot below. You can see that the estimated power in each "inverter to injection" cable is 0.48 kW, the power of a single module. Where in reality, all inverters/modules connect to a single AC cable, which thus carries more current and suffers from higher losses than if it was 6 cables with a smaller current => how can we estimate correctly the AC losses in that situation ? Thanks a lot for the help. Julien Link to comment Share on other sites More sharing options...
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