Re: [RE-wrenches] PV watts question

Most modern string inverters have a DC-DC boost phase to allow a wide DC voltage operation. Whatever voltage the inverter side works at is where the inverter will be most efficient, and thus generate less heat. So it is not really accurate to say high voltage is worse than low voltage for the “

Re: [RE-wrenches] PV watts question

Are they adjusting the DC system size field along with the DC to AC ratio? If not, they are just changing the inverter size without changing array size, and then at 1.5 the clipping is coming in to reduce the yield at the highest ratio. Mike Michael Mahon (he/him) Solar Academy Manager | SM

Re: [RE-wrenches] PG&E Nem3

William - I believe the chart you included is EXPORT rate only. So customer will not PAY > $3/kWh from 6-8 pm in Sep but whatever the TOU rate is as I think NEM3 customers are forced onto TOU - I think somewhere from $0.55-$0.60/kWh. (If they can dump their battery into the grid from 6-8 every

Re: [RE-wrenches] APS rapid shutdown

Dave – w.r.t #3, I think this is mostly a requirement from the inverter manufacturer. For SMA, there is a minimum DC voltage required in shutdown (when there is also no AC voltage). This minimum can come from one string, that is, only the longest string needs to be over the minimum, the others

Re: [RE-wrenches] Overpowered mppt landing in a SMA-41?

Bill - you got it - the inverter will hold at the 10A limit. When this limit is achieved, you will see a log entry for "derating mode" The Isc limit for the US-41 is 18A per channel, this is the limit you cannot exceed. Not sure if the US-41 is installed already? If you think you will have good

Re: [RE-wrenches] Installers in Nazareth, PA?

Nik - Paradise Energy Solutions would be a good choice for that area. https://www.paradisesolarenergy.com/ Best regards - Mike Michael Mahon Solar Academy Manager | SMA America 3925 Atherton Rd Rocklin, CA 95765 +1 916 918 9412 www.SMA-America.com Solar Academy we

Re: [RE-wrenches] SMA Rapid Shutdown and Secure Power Supply

Dave - Unfortunately the SPS feature is not "back" fully. Choosing "yes" during commissioning for the SPS feature allows for it to work (with switch and outlet installed) but ONLY for the same solar day as an outage occurs. When the Sunny Boy goes to sleep, the sunspec transmitter will stop and

Re: [RE-wrenches] SMA AFCI events and ferrite cores

Bill - SMA is continuously working to improve the accuracy of our AFCI detection and minimize impacts on system operation of this important safety function. Intentionally degrading the signal coming into the Sunny Boy for the AFCI detection to act on is not recommended. The most up to date FW