Direct, or induced, surge most likely I'd imagine. I can't imagine that the fuses were rated incorrectly. Any Type2 or Type1 devices fitted to the DC circuit on the array-side of the combiner box? Was the array frame earthed/bonded to the MET? Any damage to the inverters?
My god, it's been quiet on the forums! How is everyone doing? Anything to discuss/chat about? Any questions or insights? I'm heading to Intersolar tomorrow for the day, will see how the land lies over there...
Sent from my iPhone using Tapatalk
New Seaward PV200 tester has this functionality, with NFC transfer of curves/data to an Android device running the app. Very handy, available in a few weeks
Sent from my iPhone using Tapatalk
Just curious - anyone interested in being able to use IV curve traces when commissioning, testing etc? Very useful from a post-install troubleshooting or O&M point of view.
Sent from my iPhone using Tapatalk
Older thin-film panels often required the +ve or -ve DC branch earthed, hence why SMA might be saying they are incompatible with their TL inverters (no galvanic isolation) perhaps.
Sent from my iPhone using Tapatalk
Ok, thanks, and is the unit manipulating the voltage/supply that the inverter senses and synchronises with? Also, how is the PV+ unit different from a VO unit?
Sent from my iPhone using Tapatalk
Wouldn't using VFDs actually help minimise initial startup current surges though?
Also, what a VFD does is pretty much what goes on in a PV inverter anyway - DC to DC conversion + PWM
Sent from my iPhone using Tapatalk
PS: a SolarLog device plus a Smart Relay Station would probably give you the measurement and control functionality required (plus some ancillary hardware)
Sent from my iPhone using Tapatalk
There was a product made by Advanced Energy (formally Refusol, soon to be rekindled by the parent company Prettl perhaps) that was designed to do pretty much what you describe - with a grid-tied inverter for the PV, and a "hybrid" controller to power/demand-manage a diesel generator.
I'd...
Ok, understood. Still don't see an issue though tbh. The backup genset won't be active whilst the PV is on though, right? I'm assuming the PV is connected on the grid-side of the genny changeover switch and/or there's some form of inhibit interlock?
Sent from my iPhone using Tapatalk
Not aware of any issues with VFDs, and if the harmonics are suppressed then I wouldn't imagine any issues. The inverters are tested/certified for harmonics too, and I'd hazard that so long as the sensed grid connection doesn't fall outside the G59/3 parameters for voltage/frequency/ROCOF etc...
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc