New video on rooftop solar apps with microinverters in the spotlight

Dave Angelini

String Inverter company Fronius made this test to put pressure on microinverter companies. The String inverter market has been hit with lost sales and this was a pretty good test. It proves that electronics that go up on a roof should meet the same requirements as a String inverter that has AFCI built-in. Or, so they say!



https://www.youtube.com/watch?app=desktop&v=H3c9GbLhQhY&t=4s

BB.

Yep--Arcs can be sustained at any voltage over >~12 VDC. Arc welders do very nicely at ~25 VDC.

Here is a download PDF about the subject:

https://www.ngdc.noaa.gov/stp/satellite/anomaly/2010_sctc/docs/1-7_MBodeau.pdf

For example, at 80 Volts DC, the current must be less than ~1.5 Amps DC to be safe from sustained arcs.

-Bill

Dave Angelini

I don't think they arc weld much at NEC    Seems like a roofing boondoggle that I am happy to never been a part of!